Research activity information

• Dec. 2009 国際ジオシンセティックス学会日本支部, 2009年度 JC-IGS技術奨励賞, ジオシンセティックスを用いた「L型排水盛土防水工」の研究開発

  原 健二, 澁谷 啓, 齋藤 雅彦


• Jan. 2008 社団法人土木学会 関西支部, 土木学会関西支部創立八十周年記念 支部活動功労賞, 土木学会関西支部における活動

  SAITO Masahiko

• 大和川現河道から旧河道への地下水流出に関する研究

  齋藤雅彦, 伊藤浩子, 今城由貴, 小梶登志明, 神谷浩二

  Nov. 2023, Kansai Geo-Symposium 2023 地下水地盤環境・防災・計測技術に関するシンポジウム論文集, 5 - 9, Japanese

  [Refereed]

  Scientific journal


• キャピラリーバリアにおけるフィンガー流の発生と浸透制御に関する数値シミュレーション

  齋藤雅彦, 渡邊睦貴

  Sep. 2023, 土木学会論文集G(環境), 79(5) (5), I_215 - I_221, Japanese

  [Refereed]

  Scientific journal


• 不均一場におけるエアスパージング工法の注入空気の挙動に関する研究

  齋藤雅彦, 三谷幸平

  Nov. 2022, 土木学会論文集B1(水工学), 78(2) (2), I_769 - I_774, Japanese

  [Refereed]

  Scientific journal


• 3次元フィンガー流の数値シミュレーションと流れ場の定量的評価

  齋藤雅彦

  Nov. 2021, 土木学会論文集B1(水工学), 77(2) (2), I_115 - I_120, Japanese

  [Refereed]

  Scientific journal


• 浸透特性が不均一な斜面における降雨浸透および表面流出過程の数値シミュレーション

  久岡伸一, 齋藤雅彦

  Nov. 2020, 土木学会論文集B1(水工学), 76(2) (2), I_223 - I_228, Japanese

  [Refereed]

  Scientific journal


• 斜面安定解析における透水性分布の不均一性の影響に関する研究

  齋藤雅彦

  Nov. 2019, Kansai Geo-Symposium 2019 地下水地盤環境・防災・計測技術に関するシンポジウム論文集, 252 - 257, Japanese

  [Refereed]

  Scientific journal


• 数値シミュレーションによる不均一斜面内の局所的湧水に関する研究

  齋藤雅彦

  Nov. 2019, 土木学会論文集B1(水工学), 75(2) (2), I_1237 - I_1242, Japanese

  [Refereed]

  Scientific journal


• Development of Cavity-Detecting Test Method Using Pneumatic Pressure to Identify Weak Parts of River Levee

  新村 卓也, 藤吉 秀彰, 舘川 逸朗, SAITO MASAHIKO, 珠玖 隆行, 小松 満, 西村 伸一, 西垣 誠

  長大な河川堤防において堤体直下の基礎地盤に局所的に潜在する高透水層，水ミチ等の弱点箇所を抽出することは，連続堤としての安全性を把握する上で，極めて重要である．著者らは堤体直下の不飽和透水性地盤を対象に，弱点箇所の連続性を把握する新たな調査法として「空気圧を用いた連通試験」を考案し，試験装置プロトタイプを製作した．また，実証実験を繰り返し実施し，試験装置の改良を行ってきた．本報では改良前後の試験結果，試験装置の改良点，同手法の実用化に向けた今後の課題について報告する．

  地盤工学会中国支部, Dec. 2018, Ground Engineering, 36(1) (1), 71 - 78, Japanese

  [Refereed]

  Scientific journal


• 宅地盛土の原位置水浸沈下試験方法の開発

  Lee Junhun, Shibuya Satoru, Kataoka Satsuki, SAITO MASAHIKO

  地盤工学会関西支部, Nov. 2018, Kansai Geo-symposium 2018 地下水地盤環境・防災・計測技術に関するシンポジウム論文集, 107 - 112, Japanese

  [Refereed]

  Symposium


• STUDY ON THE INFLUENCE OF NONUNIFORMITY IN AQUIFER THERMAL ENERGY SYSTEM

  SAITO MASAHIKO, NAKAGAWA KEI

  帯水層熱エネルギーシステム（ATES）は，揚水および環水の2 本の井戸を設置することにより帯水層内の熱エネルギーを有効に利用するものであるが，適切な揚水量・揚水温度等を予測・推定するには帯水層内の熱輸送解析が必要となる．このような熱輸送解析の際には通常は地盤物性値等は空間的に均一と仮定され，実際の帯水層に見られる不均一性は考慮されない．本研究では，透水係数の空間分布モデルを用いて疑似的にばらつきと偏りのある帯水層を生成し，熱に関する移流分散解析によって揚水・環水時における不均一帯水層内の温度変化の性質について検討した．その結果，不均一場においては均一場と比較して巨視的分散により揚水温度が上昇および下降するタイミングが早くなることを示した．

  Japan Society of Civil Engineers, Nov. 2018, Journal of JSCE B1, 75(5) (5), I_337 - I_342, Japanese

  [Refereed]

  Scientific journal


• Reproduction of breakthrough curves for reactive transport experiment in the heterogeneous seepage tank by use of Continuous Time Random Walk (CTRW)

  NAKAGAWA KEI, HATANO YUKO, SAITO MASAHIKO

  不均一浸透場における陽イオン交換反応を伴う2次元断面の反応輸送実験で得られた破過曲線に対して，連続時間ランダムウォーク(CTRW)による再現を試みた。単一ピークであれば，特殊な形状でも通常のCTRWによって曲線の概形とテーリングなどを概ね再現可能であった。異常拡散の度合いを表すパラメータは，ほとんど0.8< <2.0となり，実際の多孔媒体において異常拡散に近い挙動を示していると考えられると判断された。多峰性の破過曲線は，代表的な流路が複数出現したことに対応しており，そのような場合は，流路ごとに分割してフィッティングする必要がある。

  Japanese Association of Groundwater Hydrology, Aug. 2018, Journal of Groundwater Hydrology, 60(3) (3), 305 - 315, Japanese

  [Refereed]

  Scientific journal


• NUMERICAL STUDY ON SEEPAGE FLOW IN SLOPE AT HEAVY RAIN CONSIDERING NON-UNIFORMITY AND PORE AIR FLOW

  SAITO MASAHIKO, MASUDA RYUJI

  豪雨時の斜面崩壊の誘因となる地盤内の水分量や水位・水圧分布については，浸透流解析による予測／推定がある程度可能であるが，通常は地盤物性値等は空間的に均一と仮定され，実際の斜面に見られる不均一性は考慮されない．本研究では，透水係数の空間分布モデルを用いて疑似的にばらつきと偏りのある不均一斜面を生成し，気液2相流解析によって間隙空気を考慮した豪雨時の斜面内浸透流の性質について検討した．その結果，均一場を仮定することによって斜面内の間隙水圧を過小評価する可能性があること，また，間隙空気の影響は，不均一場でより大きくなる可能性があることを示した．

  公益社団法人 土木学会, Feb. 2018, 土木学会論文集B1(水工学), 74(4) (4), I_7 - I_12, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• MULTI-LEVEL DILUTION TEST AND NUMERICAL EVALUATION OF THE HYDRAULIC PARAMETERS DISTRIBUTION

  NAKAGAWA KEI, AMANO HIROKI, SAITO MASAHIKO

  数値計算により地下水汚染等について検討する場合，透水係数や分散係数といった水理パラメータの設定が重要である．本研究では，硝酸性窒素による地下水汚染の生じている現場において，単孔式の多深度希釈試験を適用し，地下水の実流速や透水係数，分散係数を評価した．さらに，現場で得られた情報をもとに人工的に発生させた不均一場に対して単孔式の多深度希釈試験について3次元の数値計算を実施した．その結果，不均一性を考慮することで，現場で得られたトレーサー濃度低減の様子を再現できる可能性があることが分かった．

  公益社団法人 土木学会, Feb. 2018, 土木学会論文集B1(水工学), 74(4) (4), I_19 - I_24, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• DETECTION OF IMPERMEABLE STRUCTURE IN SUBSURFACE USING SURFACE THERMAL IMAGES

  NAKAGAWA KEI, AMANO HIROKI, SAITO MASAHIKO

  本研究では，地下水流動の不均一性と水文地質構造を把握する一手法として，地表面温度分布の熱画像を利用する方法について検討した．実験には，ガラス球を充填した水平浸透水槽を用いた．岩盤などの地下の不透水性構造を模擬した塩化ビニル製のブロックを浸透槽の下層に配置した後，ガラス球を充填し，所定の厚さのガラス球層を敷き詰め，60℃に調整し，着色した温水を熱トレーサーとして注入した．実験の結果，熱トレーサーが不透水性ブロックを迂回したり，その影響が明らかなケースが見受けられた．すなわち，不透水性構造が地表面温度分布に影響を与えることが確認された．また上層のガラス球層が薄いほど，不透水性構造および水みちの検出が可能であることが示唆された．

  公益社団法人 土木学会, Sep. 2017, 土木学会論文集G（環境）, 73(5) (5), I_1 - I_8, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• STUDY ON STATISTICAL PROPERTIES OF DARCY VELOCITY DISTRIBUTION AND FORM OF WATER PATH IN NON-UNIFORM FIELD

  Masahiko SAITO, Takuya KURAMOTO, Kei NAKAGAWA

  The physical propertieses of aquifer such as hydraulic conductivity vary spatially even if the aquifer seems to be uniform. This causes spatial varieties of Darcy velocity distribution, and water path flow may exist in the aquifer. However, it is impossible to grasp the spatial distribution of hydraulic properties by field test, and such an inhomogeneity is ignored in the numer

  土木学会, Feb. 2017, 土木学会論文集B1(水工学), Vol.73(No.4) (No.4), I_49 - I_54, Japanese

  [Refereed]

  Scientific journal


• 試験盛土を用いた原位置および室内試験による圧縮沈下特性の比較検討

  LEE JUNHUN, SANO YOSHIO, SAITO MASAHIKO, KATAOKA SATSUKI, SHIBUYA SATORU

  2017, 地盤工学研究発表会発表講演集(CD-ROM), 52nd, ROMBUNNO.0390, Japanese

  Symposium


• 原位置水浸沈下試験手法の開発に向けた現場検証実験

  ISHIHARA AKARI, SANO YOSHIO, LEE JUNHUN, KATAOKA SATSUKI, SAITO MASAHIKO, SHIBUYA SATORU

  2017, 地盤工学研究発表会発表講演集(CD-ROM), 52nd, ROMBUNNO.0391, Japanese

  Symposium


• Numerical study on fingered flow and solute transport in unsaturated zone

  SAITO MASAHIKO, NAKAGAWA KEI

  It has been found that irregular infiltration is often observed at the wetting front in soil under unsaturated conditions. This concept is known as fingered flow. Macroscopic dispersion occurs in the solute transport process due to the heterogeneity of the flow field. In the conventional convective-dispersion analysis, macroscopic dispersivity has been known to be an important

  Lead, Japanese Society of Soil Physics, Mar. 2016, Journal of the Japanese Society of Soil Physics, (132) (132), 13 - 21, Japanese

  [Refereed]

  Scientific journal


• 不飽和・不均一浸透場における巨視的分散長の定量的評価に関する基礎的研究

  SAITO MASAHIKO, HONDA TAKAYUKI, KOKADO YASUTO, NAKAGAWA KEI

  In recent years, the pollution of the groundwater is a serious problem. In the case of groundwater contamination, the behavior of the polluter neighborhood is handled as an advection-dispersion phenomenon in the unsaturated vertical penetration field. And it is important to predict the transport of the pollutant in such an unsaturated field. The advection-dispersion analysis is

  公益社団法人土木学会, Feb. 2016, 土木学会論文集B1（水工学）, 72(4) (4), I_277 - I_282, Japanese

  [Refereed]

  Scientific journal


• EFFECTS OF PLANT WATER UPTAKE ON SOIL AND GROUNDWATER ENVIRONMENT

  NAKAGAWA KEI, NAGAURA YOSHIYUKI, HOSOKAWA TOSAO, SAITO MASAHIKO, YASUDA HIROSHI

  Laboratory column experiment and numerical simulation performed to understand groundwater level fluctuations by plant water uptake and formation mechanism of salt accumulation. After illuminance level raised, temperature and volumetric water content (VWC) in the column were also raised, then water level of Marriott pump was lowered. It proved that plant water uptake induced by

  公益社団法人土木学会, Feb. 2016, 土木学会論文集B1（水工学）, 72(4) (4), I_259 - I_264, Japanese

  [Refereed]

  Scientific journal


• 鉄鋼スラグを用いた粘り強い補強土壁防潮堤構築に関する研究

  SHIBUYA SATORU, KATAOKA SATSUKI, SAITO MASAHIKO, TARANIDI ROHANI

  2016, 環境助成研究成果 概要集 第34回・2013年度分:5件 第35回・2014年度分:28件 平成28年, 43‐44, Japanese

  Research society


• 宅地盛土の水浸沈下に対する性能評価に関する事例研究

  SANO YOSHIO, KATAOKA SATSUKI, SAITO MASAHIKO, HASHIMOTO MITSUNORI, HONDA NORIHISA, SHIBUYA SATORU

  2016, 地盤工学研究発表会発表講演集(CD-ROM), 51st, ROMBUNNO.0384, Japanese

  Symposium


• 現地調査・室内試験に基づくモニタリング観測場所を抽出する方法の提案

  KAGAMIHARA SATOSHI, FUJII MASAO, EBISU TAKESHI, KATAOKA SATSUKI, SAITO MASAHIKO, SHIBUYA SATORU

  2016, 地盤工学研究発表会発表講演集(CD-ROM), 51st, ROMBUNNO.0802, Japanese

  Symposium


• 雨水浸透施設の適地マップ作成のための地盤調査・解析法

  SHIBUYA SATORU, BAEK JEMIN, SAITO MASAHIKO

  JSCE 公益社団法人 土木学会, Dec. 2015, 土木学会論文集C（地圏工学）, 71(4) (4), 380 - 394, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 都市型水害軽減のための雨水浸透桝の設置効果の評価

  BAEK JEMIN, 許 晋碩, 橋本 真基, 小畑 博之, SAITO MASAHIKO, 齋藤 学, SHIBUYA SATORU

  公益社団法人 地盤工学会, Sep. 2015, 第50回地盤工学研究発表会論文集, 947 - 948, Japanese

  Symposium


• 宅地盛土の原位置水浸沈下試験方法の開発 その２：浸透流解析

  SAITO MASAHIKO, KATAOKA SATSUKI, 岡本 健太, SHIBUYA SATORU

  公益社団法人 地盤工学会, Sep. 2015, 第50回地盤工学研究発表会論文集, 777 - 778, Japanese

  Symposium


• 宅地盛土の原位置水浸沈下試験方法の開発 その1：原位置および室内試験

  KATAOKA SATSUKI, 岡本 健太, SHIBUYA SATORU, SAITO MASAHIKO, AKUTAGAWA SHINICHI, 橋本 光則, 本多 典久

  公益社団法人 地盤工学会, Sep. 2015, 第50回地盤工学研究発表会論文集, 775 - 776, Japanese

  Symposium


• Ground water flow analysis with 3D ground surface model for mapping out installation of rainwater infiltration facilities

  澁谷 啓, 白 濟民, 橋本 真基, 齋藤 雅彦, 古宮 雅之, 片岡 沙都紀

  神戸大学都市安全研究センター, Mar. 2015, 神戸大学都市安全研究センター研究報告, (19) (19), 256 - 265, Japanese

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• STUDY ON ADVECTION DISPERSION PHENOMENA IN THE UNSATURATED VERTICAL INFILTRATION FIELD

  SAITO MASAHIKO, YAMAKITA Kazuyuki, NAKAGAWA Kei

  Macroscopic dispersivity is the most important factor to analyze advection-dispersion equation at the field scale. Any appropriate method for determining this parameter has not been established yet. If the pollutants exist on the ground surface, the behavior of solute is handled as an advection-dispersion phenomenon in the unsaturated vertical infiltration field. And it is know

  公益社団法人 土木学会, Feb. 2015, 土木学会論文集B1（水工学）, Vol.71(No.4) (No.4), I_235 - I_240, Japanese

  [Refereed]

  Scientific journal


• ELECTRO-KINITIC REMEDIATION MODEL FOR CONTAMINATED SOIL AND GROUNDWATER

  NAKAGAWA Kei, YAMANAKA Akira, KUBOTA Tomijiro, SAITO MASAHIKO, ASAKURA Hiroshi

  Electrokinetic remediation is recognized one of the effective technology to remediate contaminated soils and groundwater. A lot of field applications have been implemented in the world. Before conducting it in the actual field, numerical simulations are indispensable to optimize running conditions. The purpose of our research is to investigate imperative processes that have to

  公益社団法人 土木学会, Feb. 2015, 土木学会論文集B1（水工学）, Vol.71(No.4) (No.4), I_223 - I_228, Japanese

  [Refereed]

  Scientific journal


• Case study on evaluating the groundwater seepage flow by using a 3D ground model prepared from soil borehole and GIS data

  J. M. Baek, S. Shibuya, M. Furumiya, M. Saito, T. N. Lohani, J. S. Hur

  Disasters, often addressed as 'urban flooding', has been frequent in recent years and one of the mitigation measures include the rainwater permeation into the ground through infiltration facilities. The rationale for selecting suitable area for infiltration facilities has been studied by Shibuya et al. (2013) by means of a three-dimensional regional groundwater flow analysis of a target city (City A) by applying the general values of hydraulic conductivity parameters for saturated soils to the rainwater infiltration layer. As a continuing leg of the same research, in-situ soil parameters, such as, suction and soil moisture for the unsaturated surface infiltration layer were evaluated in this study. This 3-D ground model was constructed by using soil borehole and GIS data. The wide area 3D regional groundwater flow analysis was then carried out by using soil parameters evaluated in the field. The analysis output of the model matched closely to the actual groundwater level in the field and become more accurate than that in the previous study, when general soil parameters were used. The accuracy and reliability of the applied groundwater flow analysis model is enhanced. © 2015 Taylor & Francis Group, London.

  2015, Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014, 841 - 846

  International conference proceedings


• GEOTECHNICAL SURVEY AND ANALYSIS FOR RAINWATER INFILTRATION FACILITIES AGAINST URBAN FLOODING

  SHIBUYA SATORU, JEMIN BAEK, SAITO MASAHIKO

  2015, 土木学会論文集 C(地圏工学)(Web), 71(4) (4), 380 - 394 (J-STAGE), Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Two-phase Flow Simulation to Estimate Pressure on the Bottom of Coastal Dike Armor during Tsunami Overflow

  KATO Fuminori, SAITO MASAHIKO, HIMENO Kazuki, SUWA Yoshio, ISHIHARA Masayoshi, HIGUCHI Takayoshi, NANBU Takuya, OZU Takanori

  Two-phase flow simulation was performed to estimate pressure in trapezoid-shaped coastal dike armored with concrete during tsunami overflow. The results of the simulation were verified with pressure on the bottom of coastal dike armor measured in large-scale model experiments on infiltration to the embankment soil covered with cast-in-place concrete or concrete blocks. The simu

  公益社団法人 土木学会, Nov. 2014, 土木学会論文集B2（海岸工学）, Vol. 70(No. 2) (No. 2), I_971 - I_975, Japanese

  [Refereed]

  Scientific journal


• NUMERICAL EVALUATION OF NITRATE POLLUTION AND REMEDIATION

  NAKAGAWA KEI, SAITO MASAHIKO, ASAKURA HIROSHI

  Groundwater pollution by nitrate has become serious environmental issues in the Shirasu plateau of Kasanohara of Osumi peninsula, Kagoshima prefecture, Japan. We developed three-dimensional numerical simulation model to understand how the pollution diffused in the aquifer of the plateau. To evaluate the effects of countermeasures for the pollution source, the model was also use

  土木学会水工学委員会, Feb. 2014, 土木学会論文集B1（水工学）, 70(4) (4), I_1111 - I_1116, Japanese

  [Refereed]

  Scientific journal


• 3次元表層地盤モデルを用いた広域地下水流動解析結果の検証事例

  白 濟民, 許 晋碩, 古宮 雅之, 齋藤 雅彦, 澁谷 啓, 小畑 博之, 齋藤 学, 村地 恵里奈

  2014, 第49回地盤工学研究発表会論文集, Japanese

  Symposium


• 2009年台風9号豪雨により兵庫県佐用町で発生した斜面崩壊のメカニズムの考察 −崖錐堆積物斜面の崩壊事例（その2）−

  臼井 亮太, 澁谷 啓, 鏡原 聖史, 片岡 沙都紀, 文岩 秀貴, 齋藤 雅彦

  2014, 第49回地盤工学研究発表会論文集, Japanese

  Symposium


• Proposal of geotechnical engineering approach for selecting areas suitable for rainwater infiltration facilities for urban flood mitigation

  BAEK JEMIN, SHIBUYA SATORU, SAITO MASAHIKO, 許 晋碩, 橋本 真基, KATAOKA SATSUKI, 小畑 博之, 齋藤 学, 平井 緩苗

  地盤工学会, 2014, 地盤工学シンポジウム論文集 地盤工学会 編, 59, 699 - 706, Japanese

  [Refereed]

  Symposium


• 熱画像から溶質分散長を評価する試み

  中川 啓, 安部 恭平, SAITO MASAHIKO

  土木学会, Feb. 2013, 土木学会論文集B1（水工学）, Vol.69(No.4) (No.4), I_577 - I_582, Japanese

  [Refereed]

  Scientific journal


• 数値モデルを用いた３次元斜面内の降雨浸透および移流分散挙動に関する研究

  SAITO MASAHIKO, 西田 広大, 中川 啓

  土木学会, Feb. 2013, 土木学会論文集B1（水工学）, Vol.69(No.4) (No.4), I_571 - I_576, Japanese

  [Refereed]

  Scientific journal


• NUMERICAL STUDY ON THE EFFECTS OF WATER LEVEL REPRESSION IN EMBANKMENT WITH L-SHAPED DRAIN

  SAITO Masahiko, YOSHIDA Asuka, BAEK Jemin, HARA Kenji, SHIBUYA Satoru

  Geotechnical engineers are increasingly concerned with embankment failures induced by heavy rainfalls. In an attempt to reduce the risk for embankment failures, geotechnical engineers have recently proposed an L-shaped geodrain system with which seepage water flow into the embankment may be prevented even in the event of heavy rainfalls. In the conventional research, the vertical drain material has been arranged to form a straight line. In geotechnical engineering practice, however, the vertical drain may conveniently be mounted in a form of alternate arrangement. Moreover it is assumed that water level of the side of embankments is always constant. In this paper, the effects of water level repression in embankment is discussed when the vertical drain material is set to be alternate arrangement. And also the applicability of a simple estimate equation is examined. The effects of water level repression at the side of embankments are investigated as well.

  Japan Chapter of International Geosynthetics Society, 2013, Geosynthetics Engineering Journal, 28(0) (0), 23 - 30, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• On the importance of hysteresis and heterogeneity in the numerical simulation of unsaturated flow

  NAKAGAWA KEI, SAITO MASAHIKO, RONNY BERNDTSSON

  Soil hydraulic properties in field scale porous media are distributed with large spatial heterogeneity. Thus, detailed understanding of micro-physical properties leading to macro-scale heterogeneity is important for generalizing purposes in modeling. Hysteretic water retention properties greatly affect solute transport under unsaturated condition. In this study, laboratory infiltration experiments were carried out to investigate the importance of hysteresis in numerical modeling of water flow under heterogeneous distribution of hydraulic conductivity. Soil water content was observed by time domain reflectometry using small printed circuit board probes (PCBP). The PCBP observations were compared to results from numerical simulations involving saturated-unsaturated seepage analysis and two-phase flow with/without hysteresis effects. Observations were compared to both uniform and heterogeneous parameter modeling. Differences between unsaturated-saturated and two-phase flow were quite small in the numerical results for soil water content. The uniform parameter model, however, could not properly reproduce experimental water content change. The numerical results of water content change including hysteresis matched better observations for the unsaturated-saturated and two-phase flow cases. Results displayed that it is important to take heterogeneity and hysteresis into consideration in the numerical modeling in both two-phase and saturated-unsaturated flow analysis.
  

  THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, Jun. 2012, Hydrological Research Letters, 6, 59 - 64, English

  [Refereed]

  Scientific journal


• Numerical Study on Seawater Intrusion in Non-Uniform Aquifer

  SAITO MASAHIKO, TAKAYAMA YUSUKE, NAKAGAWA KEI

  Illegal dumping at the mountainside is one of serious problem in Japan. However, the conventional approaches to the groundwater pollution problem mainly focus on the urban area or flat land. In this study, it was investigated that the change of water content and solute transport caused by rainfall infiltration in the model slope by experiment and numerical analysis. The results show that the change of pore pressure was reproduced well by numerical analysis, and peak value of the concentration at the points near the source was also reproduced well. But, the calculated value of the concentration at the point far from the source was different from measured value.

  Japan Society of Civil Engineers, May 2012, Journal of Hydroscience and Hydraulic Engineering, Vol.30(No.1) (No.1), 77 - 86, English

  [Refereed][Invited]

  Scientific journal


• EVALUATION OF DISPERSIVITY UNDER UNSATURATED CONDITION BY NUMERICAL SIMULATION OF TRACER TEST IN THE SEEPAGE TANK

  Kei NAKAGAWA, Masahiko SAITO, Hiroshi ASAKURA

  Feb. 2012, Annual Journal of Hydraulic Engineering, JSCE, 第56巻, Japanese

  [Refereed]

  Scientific journal


• EXPERIMENTAL AND NUMERICAL STUDY ON RAINFALL INFILTRATION AND SOLUTE TRANSPORT IN MODEL SLOPE

  Masahiko SAITO, Takayuki HONDA, Kei NAKAGAWA

  Feb. 2012, Annual Journal of Hydraulic Engineering, JSCE, 第56巻, Japanese

  [Refereed]

  Scientific journal


• Quantitative evaluation of macroscopic longitudinal dispersivity for one-dimensional flow

  M. Saito, Y. Nishimura, D. Hoshino, K. Nakagawa

  Macroscopic dispersivity is the most important factor for analysing the convection-dispersion equation (CDE) at the field scale, and it is well known that macroscopic dispersivities vary with the scale of observation. In this study, artificial heterogeneous hydraulic conductivity fields were generated with the stochastic fractal model (f(zeta) model). Macroscopic dispersivities were evaluated for two-dimensional stochastic, isotropic and anisotropic fields by performing dimensionless CDE simulations. The results showed that macroscopic dispersivity depends on the length of the contaminant source and the travel distances, as well as on field characteristics such as variability of hydraulic conductivity for one-dimensional flow. We proposed simple models for quantitatively evaluating the average values of macroscopic longitudinal dispersivity by performing two-dimensional numerical experiments. Further, we showed that macroscopic longitudinal dispersivities calculated by these models generally corresponded with that obtained from the field study.

  INT ASSOC HYDROLOGICAL SCIENCES, 2012, MODELS - REPOSITORIES OF KNOWLEDGE, 355(355) (355), 48 - +, English

  [Refereed]

  International conference proceedings


• Numerical Study on Quantitative Evaluation of Macroscopic Disparsivity by Using Stochastic Fractal Model

  Masahiko SAITO, Yukiko NISHIMURA, Kei NAKAGAWA

  Nov. 2011, Journal of GROUNDWATER HYDROLOGY, 第53巻 第4号, Japanese

  [Refereed]

  Scientific journal


• Numerical Simulation on Advection Dispersion Processes in A Mountainside Slope

  Masahiko SAITO, Takumi ISHIHARA, Kei NAKAGAWA

  May 2011, Journal of Hydroscience and Hydraulic Engineering, Vol.29/No.1(1) (1), 47 - 56, English

  [Refereed][Invited]

  Scientific journal


• 同じ流域内の２つのシラス台地における地下水汚染機構についての数値計算

  中川 啓, 齋藤 雅彦, 籾井 和朗

  Feb. 2011, 水工学論文集, 第55巻,S 538-S 588, Japanese

  [Refereed]

  Scientific journal


• NUMERICAL STUDY ON SEAWATER INTRUSION IN NON-UNIFORM AQUIFER

  SAITO Masahiko, TAKAYAMA Yusuke, NAKAGAWA Kei

  Knowledge of seawater intrusion to aquifer is very important for the efficient use of groundwater in coastal area. Conventional numerical simulation for seawater intrusion was mainly performed in uniform porous media. However it is known that hydraulic conductivity varies spatially. The objective of this paper is to investigate a seawater intrusion behavior in non-uniform porous media by numerical simulation using the spatial distribution model for hydraulic conductivity. The results show that the length of seawater intrusion is affected by the shape of permeability distribution. When the aquifer has laminar structure of permeability, the change of seawater intrusion length is smaller than the general aquifer.

  Japan Society of Civil Engineers, 2011, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 67(4) (4), I_595 - I_600, Japanese

  [Refereed]

  Scientific journal


• 不飽和・不均一鉛直浸透場の物質移動現象に関する室内実験と数値シミュレーション

  Masahiko SAITO, 中川 啓

  Jul. 2010, 土木学会論文集B, Vol.66, No.3, 248-257, Japanese

  [Refereed]

  Scientific journal


• A significance of L-shaped geosynthetic drain (LGD) against seepage flow

  Kenji HARA, Satoru SHIBUYA, Masahiko SAITO, Nobuyuki TORII, Takayuki MASUO

  May 2010, Proceedings of the 9th International Conference on Geosynthetics, 1397-1402, English

  [Refereed]

  International conference proceedings


• 数値シミュレーションによる山腹斜面内の移流分散過程に関する基礎的研究

  Masahiko SAITO, 石原 匠, 中川 啓

  Feb. 2010, 水工学論文集, 第54巻,pp.601-606, Japanese

  [Refereed]

  Scientific journal


• 水平浸透水槽を用いたトレーサー試験による不飽和分散長の評価

  中川 啓, 中川原 尚子, 齋藤 雅彦

  Feb. 2010, 水工学論文集, 第54巻,pp.595-600, Japanese

  [Refereed]

  Scientific journal


• Inverse Analysis of Estimating Distribution of Hydraulic Conductivity and Radius of Influence Using FFT and Multi-Well Pumping Test

  Masahiko SAITO

  May 2009, Journal of Hydroscience and Hydraulic Engineering, Vol.27/No.1, pp61-69(1) (1), 61 - 69, English

  [Refereed][Invited]

  Scientific journal


• EFFECTS OF WATER LEVEL REPRESSION IN ENBANKMENT WITH L-SHAPED GEOSYNTHETIC DRAIN

  Masahiko SAITO, Kenji HARA, Satoru SHIBUYA

  Feb. 2009, 水工学論文集, 第53巻,pp.505-510, Japanese

  [Refereed]

  Scientific journal


• Mitigating embankment failure due to heavy rainfall using L-shaped geosynthetic drain (LGD)

  S. Shibuya, M. Saito, N. Torii, K. Hara

  In recent years, geotechnical engineers in Japan confront frequently with the embankment failure induced by heavy rainfall. For the purpose of mitigating such embankment failure, Shibuya et al. (2008) has recently proposed a remedial measure to protect embankment from the invasion of seepage water flow by using L-shaped geosynthetic drain (LGD). In this paper, the effectiveness of LGD system in preventing the seepage flow into the embankment is demonstrated by performing a series of numerical analysis. The behavior of a large-scale test embankment (3.9 m long, 2 m wide and 2.5 m high) subjected to seepage flow from the back of the fill was also examined in the laboratory. The significance of the LCD was manifested by performing a couple of comparative tests with and without the LCD. The seepage flow characteristics of the test fill was interpreted by comparing the test result with the result of numerical analysis. It is suggested that the LCD is effective in mitigating the embankment failure in the event of heavy rainfall.

  CRC PRESS-TAYLOR & FRANCIS GROUP, 2009, PREDICTION AND SIMULATION METHODS FOR GEOHAZARD MITIGATION, pp.299-305, 299 - +, English

  [Refereed]

  International conference proceedings


• ジオシンセティックスを用いたL型排水盛土

  澁谷啓, 齋藤 雅彦, 原健二, 舛尾孝之

  Dec. 2008, ジオシンセティックスシンポジウム論文集, 第23巻,pp. 139-146, Japanese

  [Refereed]

  Scientific journal


• ジオシンセティックスを用いたL型排水盛土防水工― 数値シミュレーションと模型実験による評価 ―

  澁谷 啓, 齋藤 雅彦, 原 健二, 桝尾 孝之

  In recent years, the embankment failure due to heavy rainfalls has frequently been taking place in Japan. Such embankment failures may often be induced by ground water seepage flow into the embankment, which in turn weakens the embankment itself involved with a complete loss of the soil suction. Accordingly, it is crucially important to avoid seepage flow into the embankment as well as the accumulation of rainfall behind the embankment. In this paper, a countermeasure named "watertight embankment using L-shaped geosynthetic drain" for protecting embankment against heavy rainfalls is proposed. A design method for the proposed technique is also described. A numerical simulation was carried out to examine the efficiency of the L-shaped geosynthetic drain. The numerical technique was evaluated based on the results of a seepage flow model test performed using a decomposed granite soil.

  Japan Chapter of International Geosynthetics Society, Dec. 2008, ジオシンセティックス論文集, 第23巻, pp.139-146, 139 - 146, Japanese

  [Refereed]

  Scientific journal


• ジオシンセティックスを用いたL型排水盛土防水工― 実物大実験による評価 ―

  原 健二, 澁谷 啓, 齋藤 雅彦, 鳥居 宣之, 蔡 鍾吉, 桝尾 孝之

  In recent years, the embankment failure due to heavy rainfalls has frequently been taking place in Japan. Such embankment failures may often be induced by ground water seepage flow into the embankment, which in turn weakens the embankment itself involved with a complete loss of the soil suction. Accordingly, it is crucially important to avoid seepage flow into the embankment as well as the accumulation of rainfall behind the embankment. In this paper, a countermeasure named "watertight embankment using L-shaped geosynthetic drain" for protecting embankment against heavy rainfalls is proposed. A design method for the proposed technique is also described. A numerical simulation was carried out to examine the efficiency of the L-shaped geosynthetic drain. The numerical technique was evaluated based on the results of a seepage flow model test performed using a decomposed granite soil.

  Japan Chapter of International Geosynthetics Society, Dec. 2008, ジオシンセティックス論文集, 第23巻,pp.147-154, 139 - 146, Japanese

  [Refereed]

  Scientific journal


• Seepage Flow Tests in Full-Scale Embankment: Significance of L-Shaped Geosynthetic Draine

  HARA, K, SHIBUYA, S, SAITO, M, TORII, N

  Sep. 2008, Proceedings of the 4th European Geosynthetics Conference, CD-ROM

  [Refereed]

  International conference proceedings


• Study on Pore-Air effect on vertical infiltration into 2-layered ground

  Masahiko SAITO, Hiroaki MASAKI, Junichi ICHINARI

  Aug. 2008, 応用力学論文集, Vol.11, pp.843-850, Japanese

  [Refereed]

  Scientific journal


• Experimental and numerical investigations of water infiltration processes in the unsaturated-heterogeneous porous media

  Kei NAKAGAWA, Masahiko SAITO, Kazuro MOMII, Ronny BERNDTSSON

  Jun. 2008, Proceedings of IAHR International Groundwater Symposium -Istanbul 2008, pp.346-354, English

  [Refereed]

  International conference proceedings


• 「L型配置ジオシンセティックス盛土排水工」の研究･開発

  HARA Kenji, SHIBUYA Satoru, SAITO Masahiko

  Mar. 2008, ジオシンセティックス技術情報, Vol.24,No.1,pp.9-20(1) (1), 9 - 20, Japanese


• 不飽和-不均一場における水分動態解析

  NAKAGAWA Kei, SAITO Masahiko

  Hydrogeological parameters of field soil porous media are distributed with large heterogeneity. Evaluation of physical heterogeneity effects on soil water flow is important to understand basic flow characteristics of field soil. In this study, two types of water infiltration experiments were carried out to examine water flow under the heterogeneous distribution of hydraulic conductivities. Soil water change was measured by time domain reflectometry (TDR) using small printed circuit board probes (PCBP). To evaluate soil water distribution change in the experimental sand box, the simple image analysis of digital photo of the experiments was applied. In order to understand detailed water and air flow in the experiments, numerical simulations were carried out. In the numerical simulations, ordinary unsaturated-saturated seepage analysis and two-phase flow analysis were compared. Moreover, hysteresis effects on the soil water content change were also examined. Apparent differences between unsaturated-saturated and two-phase analyses were not observed in the results of water content change. For the ponding experiment, histeresis should be included in the simulation.

  Japan Society of Civil Engineers, Feb. 2008, Doboku Gakkai Ronbunshuu B, Vol.64 No.1, pp.30-40(1) (1), 30 - 40, Japanese

  [Refereed]

  Scientific journal


• FFTを応用した多孔式揚水試験による透水係数分布と影響圏半径の逆解析

  SAITO Masahiko

  Feb. 2008, Annual Journal of Hydraulic Engineering, JSCE, VOL.52, pp. 409-414, Japanese

  [Refereed]

  Scientific journal


• L-shaped geodrain in embankment model test and numerical simulation

  M. Saito, S. Shibuya, J. Mitsui, K. Hara

  An embankment is usually made of unsaturated soil. Unsaturated soil when properly compacted is stiff and strong, since it sustains the matrix suction. The soil suction disappears quickly in the process of wetting, which in turn brings about large deformation or even failure of the embankment. In order to prevent seepage flow into the embankment, and also accumulation of water behind it. Design for an L-shaped geodrain in the embankment is proposed in this paper. A numerical simulation was carried out to examine the efficiency of the L-shaped geodrain system. The analysis was based on the results of a seepage flow test performed using a decomposed granite soil.

  ZHEJIANG UNIV PRESS, 2008, GEOSYNTHETICS IN CIVIL AND ENVIRONMENTAL ENGINEERING, pp.428-433, 428 - +, English

  [Refereed]

  International conference proceedings


• 数値シミュレーションによる多層地盤内および湛水浸潤時のフィンガリング現象に関する研究

  SAITO Masahiko, 中平 隆

  Aug. 2007, Journal of Applied Mechanics JSCE, Vol.10, pp. 847-854, Japanese

  [Refereed]

  Scientific journal


• Numerical Study on Fingering Flow in Non-Uniform Porous Media

  Masahiko SAITO

  May 2007, Journal of Hydroscience and Hydraulic Engineering, Vol.25/No.1, pp. 21-30(1) (1), 21 - 30, English

  [Refereed][Invited]

  Scientific journal


• 不均一地盤内の鉛直浸透過程における水と空気のフィンガリング現象に関する研究

  Masahiko SAITO, Takashi NAKAHIRA

  神戸大学都市安全研究センター, Mar. 2007, 神戸大学都市安全研究センター研究報告, 第11号(11) (11), 51 - 58, Japanese

  Link to Kobe Univ. Repository (Kernel)


• 地下水汚染問題における濃度分布の確率的評価手法に関する基礎的研究

  Masahiko SAITO

  In this study, the stochastic properties of concentration distribution in advection dispersion phenomenon in the non-uniform field ware investigated by using Monte-Carlo simulation, and methods of stochastic risk evaluation were examined. The results showed that the probability distribution of concentration in non-uniform field was accorded to the β distribution. And the variance of concentration could be estimated by the method that the parameter β was assumed to be the exponential function of expected value. Thus, once the expected value of concentration was evaluated, the probability distribution function of concentration could be reproduced. In addition, the relationship between the variance of concentration and the resolution of analysis was clarified.

  Japan Society of Civil Engineers, Feb. 2007, 水工学論文集, 第51巻499-504, 499 - 504, Japanese

  [Refereed]

  Scientific journal


• 降雨浸透・浸出過程における地盤内間隙空気の影響に関する実験と数値解析

  Masahiko SAITO, Soichiro YAGI, Hiroaki MASAKI, Junichi ICHINARI

  土木学会, Aug. 2006, 応用力学論文集, Vol.9 pp.901-908, 901 - 908, Japanese

  [Refereed]

  Scientific journal


• 狭小水路における鋼矢板護岸の粗度係数について

  齋藤 雅彦, 中平 隆, 市成 準一

  神戸大学都市安全研究センター, Mar. 2006, 神戸大学都市安全研究センター研究報告, 第10号, 85 - 92, Japanese

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 飽和・不飽和浸透流解析による不均一地盤内のフィンガリング現象に関する研究

  齋藤 雅彦

  Feb. 2006, 水工学論文集, 第50巻, 217-222, 217 - 222, Japanese

  [Refereed]

  Scientific journal


• Two-Phase Flow Simulation of Rainfall Infiltration and Seepage Processes Considering Heterogeneity of Hydraulic Conductivity

  Masahiko SAITO, Takeshi KAWATANI

  May 2005, Journal of Hydroscience and Hydraulic Engineering, Vol.23/No.1, 67-76(1) (1), 67 - 76, English

  [Refereed][Invited]

  Scientific journal


• Field Measurements and Inundation Analysis of the Flooded Area of the Izushi RiverCaused by Typhoon No.23 (TOKAGE)

  大薗 政志, 椿 涼太, 川谷 健, 藤田 一郎, 斎藤 雅彦, 神田 佳一

  神戸大学都市安全研究センター, Mar. 2005, 神戸大学都市安全研究センター研究報告, 9, 111 - 120, Japanese


• Inundation Analysis of the Shinn-minato River by using LiDAR data

  椿 涼太, 川谷 健, 藤田 一郎, 斎藤 雅彦

  神戸大学都市安全研究センター, Mar. 2005, 神戸大学都市安全研究センター研究報告, 9, 123 - 133, Japanese


• 移流分散現象における分散長と透水係数の空間分布特性の関係について

  齋藤 雅彦, 川谷 健

  It is known that observed macroscopic dispresivity depends on observation scale, so that a single value cannot represent the field property for dispersion. In this study, numerical simulations of the advection dispersion phenomena in various random-permeability fields generated by using stochastic fractal model were carried out to investigate the relationship between spatial distributions of hydraulic conductivity and dispersivity. The results show that various concentration distributions occur even when the hydraulic conductivities of flow fields are statistically the same. It is also shown that a dispesivity distribution model expressed by function of scale can well reproduce the ensemble mean of concentration distributions.

  Japan Society of Civil Engineers, Feb. 2005, 水工学論文集, 49, 1, 133-138, 133 - 138, Japanese

  [Refereed]

  Scientific journal


• 降雨浸透・蒸発散・地下水流出減少における間隙空気に影響について

  川谷 健, 宮田 和真, ジョージ ルゴメラ, 齋藤 雅彦

  Kobe University, Nov. 2004, 建設工学研究所論文報告集, 46, 1-14, 1 - 14, Japanese

  [Refereed]

  Scientific journal


• 一般廃棄物埋立処分地からの地下水侵出量の予測手法

  川谷 健, ジョージ ルゴメラ, 齋藤 雅彦

  Kobe University, Nov. 2004, 建設工学研究所論文報告集, 46, 15-26, 15 - 26, Japanese

  [Refereed]

  Scientific journal


• 3次元斜面における降雨浸透過程の数値シミュレーション

  齋藤 雅彦, 川谷 健

  Kobe University, Nov. 2004, 建設工学研究所論文報告集, 46, 79-88, 79 - 88, Japanese

  [Refereed]

  Scientific journal


• Numerical Study on Effect of Pore-air on Infiltration and Groundwater Drainage

  Takeshi KAWATANI, Masahiko SAITO, George V Lugomela

  Sep. 2004, Proc. Int. Conf. on Finite Element Models, MODFLOW and More, 245-248, English

  [Refereed]

  International conference proceedings


• Numerical study ib rainfall infiltration and seepage processes through multifractal permeability field by using two-phase flow analysis

  Masahiko SAITO, Takeshi KAWATANI, G V Lugomela

  Sep. 2004, Proceedings of International conference on Finite Element Models, MODFLOW, and More:, 257-260, English

  [Refereed]

  International conference proceedings


• 地盤の不均質性を考慮した降雨浸透・浸出過程の気液2相流数値シミュレーション

  齋藤 雅彦, 川谷 健

  2004, 水工学論文集, 48 1 319-324, Japanese

  [Refereed]

  Scientific journal


• 地下水低下工法における曝気ろ過除鉄方式の適用

  菊田 勝之, 川谷 健, 齋藤 雅彦

  神戸大学, 2004, 神戸大学大学院自然科学研究科紀要, 22 B 21-22, 21 - 27, Japanese

  [Refereed]

  Scientific journal


• Scale effects on two-phase flow of air and water through porous media

  Masahiko SAITO, Takeshi KAWATANI

  Apr. 2003, Proceedings of the 2ND Asian conference on Unsaturated Soils, English

  [Refereed]

  International conference proceedings


• 降雨浸透・浸出過程における地盤の不均質性の影響について

  齋藤 雅彦, 川谷 健

  Kobe University, 2003, 建設工学研究所論文報告集, 45, 43-54, 43 - 54, Japanese

  [Refereed]

  Scientific journal


• 間隙内空気の運動を考慮した数値シミュレーションによる雨水浸透・浸出過程に関する研究

  齋藤 雅彦, 川谷 健

  土木学会, 2003, 応用力学論文集, l.6 865-872, 865 - 872, Japanese

  [Refereed]

  Scientific journal


• Study on statistical properties of 1-D random permeability fields generated by stochastic fractal model

  Masahiko SAITO, Takeshi KAWATANI

  土木学会, Aug. 2002, Journal of Applied Mechanics JSCE, Vol.5, 491 - 498, Japanese

  [Refereed]

  Scientific journal


• Simple method for generation of 1-D and 2-D random permeability field by using stochastic fractal model

  Masahiko SAITO, Takeshi KAWATANI

  Jun. 2002, Proceedings of the 4th International conference on CALIBRATION AND RELIABILITY IN GROUNDWATER MODELING, vol.1, 176 - 179, English

  [Refereed]

  International conference proceedings


• Numerical Study on Behavior of Seawater in Coastal Stratified Aquifer

  Takeshi KAWATANI, Masahiko SAITO

  Jun. 2002, Proceedings of the 4th International conference on CALIBRATION AND RELIABILITY IN GROUNDWATER MODELING, vol.2, English

  [Refereed]

  International conference proceedings


• Study on numerical model of 1-D and 2-D random fractal permeability field

  齋藤 雅彦, 川谷 健

  神戸大学都市安全研究センター, Mar. 2002, 神戸大学都市安全研究センター研究報告, 6, 193 - 201, Japanese


• Study on Applicability of Geostatistical Models of Hydraulic Conductivity

  Masahiko SAITO, Takeshi KAWATANI

  Dec. 2001, Journal of Geotechnical Engineering, JSCE, No.694/Ⅲ-57(57) (57), 245 - 258, Japanese

  [Refereed]

  Scientific journal


• FEM analysis of seawater intrusion in multi-layered aqifer as an advection-dispersion phenomenon

  Takeshi KAWATANI, Masahiko SAITO

  Dec. 2001, Proceedings of the 8th International Symposium on Flow Modeling and Turbulence Measurements, 819 - 826, English

  [Refereed]

  International conference proceedings


• Numerical Analysis of Seawater Intrusion in Multi-layered Aquifer by the Streemline-Upwind/Petrov-Galerkin Method

  Takeshi KAWATANI, Masahiko SAITO

  May 2001, Proceedings of 3rd International Conference on FUTURE GROUNDWATER RESOURCES AT RISK, Themes 2, English

  [Refereed]

  International conference proceedings


• Advection-dispersion phenomena of seawater in multi-layered coastal aquifer

  Kawatani Takeshi, Saito Masahiko

  Kobe University, Mar. 2001, Report of Research Center for Urban Safety and Security Kobe University, 5, 121 - 128, English


• 都市地盤環境 (研究報告 2 : 都市災害の危険度予測 3)

  川谷 健, 藤田 一郎, 齋藤 雅彦

  神戸大学都市安全研究センター, Mar. 2001, 神戸大学都市安全研究センター研究報告, 3, 43 - 47, Japanese


• Tank Model for Estimation of Standard Project Flood in a Small-Size Watershed

  Takeshi KAWATANI, Masahiko SAITO, Asare-Boafo EMMANUEL

  2001, Hydrological Science and Thecnology, American Institute of Hydrology, 17(1-4), English

  [Refereed]

  Scientific journal


• Parameter Determination of a Tank Model for Probable Maximum Runoff Prediction

  Kawatani Takeshi, Saito Masahiko, Asare-Boafo Emmanuel

  Kobe University, Mar. 2000, Report of Research Center for Urban Safety and Security Kobe University, 4, 87 - 96, English


• Theoretical Study on Spatial Distribution of Hydraulic Conductivity

  Masahiko SAITO, Takeshi KAWATANI

  Mar. 2000, Journal of Geotechnical Engineering, JSCE, No.645/Ⅲ-50, 103 - 114, Japanese

  [Refereed]

  Scientific journal


• Identification of tank model parameter for predicting probable maximum peak discharge caused by rainfall with a prescribed

  Takeshi KAWATANI, Masahiko SAITO, Asare-Boafo EMMANUEL

  2000, Proceedings of International Symposium on River Flood Defence, 1, English

  [Refereed]

  International conference proceedings


• Two-phase flow simulation of water scaling of compressed air storage under cyclic pressure change in an unlined rock cavern

  T Kawatani, M Saito

  Numerical simulations of two-phase flow through a porous medium were performed to understand the dynamic behaviour of the air that seeped out of an unlined cavern adopted for CAES (Compressed Air Energy Storage) in a saturated rock mass. In some cases, the pressure in the cavern is expected to change periodically due to daily or weekly usage of the compressed air. When the pressure is lowered, the amount of groundwater flowing into the cavern increases. If the water supply is insufficient, the air leakage might be induced. This study also investigated the effects of the periodic change in the air pressure on the water sealing of compressed air. It was found that the air which had seeped into the porous rock mass was trapped in a definite zone around the cavern when the pressure in the cavern was lowered.

  INT ASSOC HYDROLOGICAL SCIENCES, 2000, CALIBRATION AND RELIABILITY IN GROUNDWATER MODELLING: COPING WITH UNCERTAINTY, IAHS Publication no.265(265) (265), 432 - 438, English

  [Refereed]

  International conference proceedings


• Finite Element Analysis of Groundwater Pollution Considering Density-Dependent Flow and Transport

  斎藤 雅彦, 川谷 健

  神戸大学都市安全研究センター, Mar. 1999, 神戸大学都市安全研究センター研究報告, 3, 117 - 127, Japanese


• Identification of a short-term storm drainage prediction model in a small watershed

  T Kawatani, M Saito, E Asare-Boafo

  The main purpose of runoff analysis on short-term storm drainage is to have a runoff model with which it can be possible to forecast storm floods. Tank model is one of the practical models for the estimation of the effective storm drainage that will be generated from a given rainfall in the short term within a small catchment area. For a workable model to be proposed, a number of known rainfall and flow data are used first to determine values of the parameters that define the model. These parameters are representative of one form or the other of the actual rainfall-runoff scenario. For most of the events used in this study, there was significant reproduction of the observed hydrographs especially around the peak which was the characteristic of the storm flood that was of much interest. However, in each case the parameters determined were not the same. Due to this, the choice of the exact model among the range of parameters available for any generic use in forecasting required further considerations. It was observed that though the parameters varied greatly there was some relationship with the pattern of the hyetograph whether forward, central or backward concentrated. A basis for the choice of the most likely model that will be suitable in estimating the peak amount of short-term runoff was considered. The parameters produced by a backward concentration rainstorm were generally on the high side and its use with other rainstorms yielded peaks usually not an underestimation of the observed. It is the purpose of this identification process to come out with characteristics of the rainfall-flow relationship and their effects on the high peak runoff responses. This characteristics and its behavior on the model will greatly enhance its adaptation for application. In conclusion, the tank model as a means of estimating short-term runoff was observed to be fairly satisfactory.

  WATER RESOURCES PUBLICATIONS, 1999, HYDROLOGIC MODELING, 166 - 177, English

  [Refereed]

  International conference proceedings


• Numerical study of Feasibility of Compressed Air Storage in Soft Rock Cavern

  Takeshi KAWATANI, Masahiko SAITO

  Aug. 1998, Proceedings of 3rd International conference on Hydro-Science and -Engineering, Volume Ⅲ, English

  [Refereed]

  International conference proceedings


• Estimation of Hydraulic Conductivities of a Leaky Aquifer System from Observed Drawdown

  Masahiko SAITO, Takeshi KAWATANI

  Aug. 1998, Proceedings of 3rd International conference on Hydro-Science and -Engineering, Volume Ⅲ, English

  [Refereed]

  International conference proceedings


• Inverse Analysis of Estimating Permeability in a Leaky Multiaquifer System

  斎藤 雅彦, 川谷 健

  神戸大学都市安全研究センター, Mar. 1998, 神戸大学都市安全研究センター研究報告, 2, 97 - 102, Japanese


• Identification of Tank Model for Flood Forecast

  川谷 健, 斎藤 雅彦, エマヌエル アサレ・ポアフ

  神戸大学都市安全研究センター, Mar. 1998, 神戸大学都市安全研究センター研究報告, 2, 83 - 95, Japanese


• 現場水頭観測値に基づく漏水性被圧帯水層の透水係数の逆解析

  齋藤 雅彦, 川谷 健

  Feb. 1998, 水工学論文集, 第42巻, 337 - 342, Japanese

  [Refereed]

  Scientific journal


• Numerical study on effects of leakage from phreatic aquifer on flow in confined aquifer

  T Kawatani, M Saito, J Tsuchiyama

  AMER SOC CIVIL ENGINEERS, 1997, GROUNDWATER: AN ENDANGERED RESOURCE, Proceedings of theme C, 355 - 360, English

  [Refereed]

  International conference proceedings


• Inverse analysis of estimating permeability of semipervious confining layer

  T Kawatani, M Saito, J Tsuchiyama

  AMER SOC CIVIL ENGINEERS, 1997, GROUNDWATER: AN ENDANGERED RESOURCE, Proceedings of theme C, 45 - 50, English

  [Refereed]

  International conference proceedings


• 漏水性被圧帯水層の揚水管理に関する解析的研究

  川谷 健, 齋藤 雅彦, 土山 滋郎

  Aug. 1996, 建設工学研究所報告, 38(A) (A), 101 - 109, Japanese

  [Refereed]

  Research institution

• ポイントダイリューション法による透水係数と分散長の推定

  中川啓, 天野弘基, 齋藤雅彦

  2017, 日本地下水学会講演会講演予稿, 2017


• ふぞろいな地盤と見えない地下水流の数値シミュレーション（特集：資源と混相流(1)）

  齋藤 雅彦

  Mar. 2011, 混相流, Vol.25, No.1, 36-43, Japanese

  Introduction scientific journal


• ジオシンセティクスを用いたL型排水盛土防水工の実物大実験

  原健二, 三井仁哉, 三宗桂司, 齋藤雅彦, 鳥居宣之, 澁谷啓

  13 Jul. 2009, 地盤工学研究発表会発表講演集, 44th, 1697 - 1698, Japanese


• 台風23号による洪水災害の調査研究

  川谷 健, 齋藤 雅彦, 藤田 一郎, 宮本 仁志

  神戸大学都市安全研究センター, Mar. 2005, 神戸大学都市安全研究センター研究報告, 16, 45 - 63, Japanese


• 表面流を考慮した斜面内降雨浸透課程の3次元解析

  齋藤 雅彦, 椿 涼太, 中村 有加里, 藤田 一郎, 川谷 健

  神戸大学都市安全研究センター, Mar. 2005, 神戸大学都市安全研究センター研究報告, 9, 135-142, 135 - 141, Japanese

  Others

  Link to Kobe Univ. Repository (Kernel)


• 航空レーザー測量を用いた反乱解析を利用した新湊川反乱シミュレーション

  椿 涼太, 川谷 健, 藤田 一郎, 齋藤 雅彦

  Mar. 2005, 神戸大学都市安全研究センター研究報告, 9, 123-134, Japanese

  Others

  Link to Kobe Univ. Repository (Kernel)


• 地盤内間隙空気が降雨浸透および地下水排水に及ぼす影響について

  川谷 健, ジョージ ルゴメラ, 齋藤 雅彦

  神戸大学都市安全研究センター, 2004, 神戸大学都市安全研究センター研究報告, 8 141-156, 141 - 155, Japanese

  Others

  Link to Kobe Univ. Repository (Kernel)


• 降雨浸透による間隙水圧変化と降雨特性の関係に関する研究

  齋藤 雅彦, 加藤 正司, 川谷 健

  神戸大学都市安全研究センター, 2004, 神戸大学都市安全研究センター研究報告, 8 157-164, 157 - 163, Japanese

  Others

  Link to Kobe Univ. Repository (Kernel)


• 一般廃棄物埋立処分地における降雨浸透・浸出水量の予測手法の研究

  川谷 健, ジョージ ルゴメラ, 齋藤 雅彦

  神戸大学都市安全研究センター, 2004, 神戸大学都市安全研究センター研究報告, 8 127-140, 127 - 139, Japanese

  Others

  Link to Kobe Univ. Repository (Kernel)


• 造成地からの流出予測のためのタンクモデル

  川谷 健, 齋藤 雅彦, 板東 孝美

  Mar. 2003, 神戸大学都市安全研究センター研究報告, No.6 175-192, Japanese

  Others

  Link to Kobe Univ. Repository (Kernel)


• Scale Effect on Seepage Process of Compressed Air into Saturated Rock Mass

  Saito Masahiko, Kawatani Takeshi

  Kobe University, Nov. 2002, Memoirs of Construction Engineering Research Institute, 44, 113 - 124, Japanese


• Identification of Hydraulic Conductivity by FEM-Inverse Analysis from Single-Well Pumping Test Data

  Kikuta Katsuyuki, Kawatani Takeshi, Saito Masahiko

  Kobe University, Nov. 2002, Memoirs of Construction Engineering Research Institute, 44, 125 - 133, Japanese


• 研究報告(2)都市災害の危険度予測 : 都市基盤研究分野都市地盤環境研究チーム

  川谷 健, 藤田 一郎, 齋藤 雅彦

  神戸大学都市安全研究センター, 18 Jan. 2001, 神戸大学都市安全研究センター研究報告, 5, 25 - 28, Japanese


• Numerical Study on Groundwater Pollution Caused by Water-Soluble Materials

  Saito Masahiko, Kawatani Takeshi

  Kobe University, Nov. 1999, Memoirs of Construction Engineering Research Institute, 41, 185 - 194, Japanese


• Numerical Study on Flow of High Pressure Air through Saturated Porous Medium

  Kawatani Takeshi, Saito Masahiko

  Kobe University, Nov. 1999, Memoirs of Construction Engineering Research Institute, 41, 75 - 82, English


• Study on Seepage Process of Compressed Air into Saturated Rock Mass under Periodic Pressure Change and Its Control

  Kawatani Takeshi, Saito Masahiko

  Kobe University, Nov. 1998, Memoirs of Construction Engineering Research Institute, 40, 107 - 114, Japanese


• Study on Influences of Leakage to Deep Well Method at Large Excavation Site

  Saito Masahiko, Kawatani Takeshi, Tsuchiyama Jiro

  Kobe University, Nov. 1997, Memoirs of Construction Engineering Research Institute, 39, 107 - 116, Japanese


• Finite element analysis of flow in confined aquifer affected by leakage from phreatic aquifer

  Kawatani Takeshi, Saito Masahiko, Tsutiyama Jiro

  Kobe University, Mar. 1997, Report of Research Center for Urban Safety and Security Kobe University, 1, 75 - 82, English


• Inverse Analysis of Groundwater Flow by Constrained Simplex Method

  Kawatani Takeshi, Saito Masahiko

  Kobe University, Dec. 1989, 土地造成工学研究施設報告, 7, 105 - 124, Japanese


• Numerical Simulation of Seawater Intrusion due to Pumpage in an Unconfined Aquifer

  Kawatani Takeshi, Saito Masahiko

  Kobe University, Dec. 1988, 土地造成工学研究施設報告, 6, 71 - 90, Japanese

• 地下水用語集

  齋藤 雅彦

  Contributor, 公益社団法人 日本地下水学会, Nov. 2011, Japanese

  Scholarly book


• 不飽和地盤の挙動と評価 （第2章2．4．2 「水と空気の二相流問題」pp.50-52）

  齋藤 雅彦

  Contributor, 社団法人地盤工学会, 2004, Japanese

  Scholarly book


• 地下水流における移流分散現象及び気液２相流の数値シミュレーションと透水性の空間分布に関する研究

  齋藤 雅彦

  Single work, 神戸大学博士論文, Aug. 2001

• 施工時の含水比や締固めに着目した盛土の透水性能に関する実験的検討

  友近温人, 片岡沙都紀, 河井克之, 齋藤雅彦

  令和5年度土木学会全国大会第78回年次学術講演会, Sep. 2023, Japanese

  Oral presentation


• 締固め時の飽和度が土の透水性に与える影響

  友近温人, 片岡沙都紀, 河井克之, 齋藤雅彦

  第58回地盤工学研究発表会, Jul. 2023, Japanese

  Oral presentation


• NUMERICAL STUDY ON SPRING WATER IN NON-UNIFORM SLOPES AT HEAVY RAIN

  SAITO Masahiko

  46th IAH Congress - Malaga, Spain 2019, Sep. 2019, English

  Poster presentation


• 豪雨時における斜面内湧水の発生に関する数値実験

  齋藤 雅彦

  第54回地盤工学研究発表会, Jul. 2019, Japanese

  Oral presentation


• ATESにおける不均一帯水層内の熱輸送シミュレーション

  SAITO MASAHIKO, 中川 啓

  第26回地球環境シンポジウム, Sep. 2018, Japanese, 土木学会 地球環境委員会, 長崎大学 文教キャンパス, 帯水層蓄熱（ATES）システムは，揚水および環水の2本の井戸を設置することにより帯水層内の熱エネルギーを有効に利用するものであるが，適切な揚水量・揚水温度等を予測・推定するには帯水層内の熱輸送解析が必要となる．このような熱輸送解析の際には通常は地盤物性値等は空間的に均一と仮定され，実際の帯水層に見られる不均一性は考慮されない．本研究では，透水係数の空間分布モデルを用いてばらつきと偏りのある等方性および異方性の帯水層を疑似的に生成し，熱に関する移流分散解析によって揚水・環水時における不均一帯水層内の温度変化の性質について検討した．, Domestic conference

  Poster presentation


• 河川堤防における弱点箇所抽出を目的とした組合せ調査法と再現解析による妥当性検討

  舘川 逸朗, 新村 卓也, 藤吉 秀彰, 西垣 誠, 西村 伸一, SAITO MASAHIKO

  土木学会第73回年次学術講演会, Aug. 2018, Japanese, 土木学会, 北海道大学札幌キャンパス, Domestic conference

  Oral presentation


• 不均一浸透場のモデリングと熱・物質輸送の数値シミュレーション

  SAITO MASAHIKO

  5th COFTEC Symposia, May 2018, Japanese, 神戸大学 複雑熱流体工学研究センター, 神戸大学工学研究科, Domestic conference

  Oral presentation


• Numerical study on heat transport in non-uniform aquifers

  SAITO MASAHIKO, NAKAGAWA KEI

  44th Annual Congress of the International Association of Hydrogeologists, Sep. 2017, English, International Association of Hydrogeologists, Dubrovnik, As heat utilization in aquifers in urban areas, there are use of heat sources in aquifers with high velocity and utilization of heat storage in retention zones. In any case, in order to properly judge the availability of the project, a simulation method concerning heat transport in the aquifer is important, as well as an efficient in-situ survey method. On the other hand, when, International conference

  Poster presentation


• 斜面内浸透流における不均一性の影響と間隙空気の挙動について

  SAITO MASAHIKO, 増田 竜士

  第18回地下環境水文学に関する研究集会, Jul. 2017, Japanese, 和歌山市, Domestic conference

  Oral presentation


• 試験盛土を用いた原位置および室内試験による圧縮沈下特性の比較検討

  李 俊憲, 佐野 祥男, SAITO MASAHIKO, 片岡 沙都紀, 澁谷 啓

  第52回地盤工学研究発表会, Jul. 2017, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 原位置水浸沈下試験手法の開発に向けた現場検証実験

  石原 朱莉, 佐野 祥男, 李 俊憲, 片岡 沙都紀, SAITO MASAHIKO, 澁谷 啓

  第52回地盤工学研究発表会, Jul. 2017, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 堤体内浸透流における不均一性の影響と間隙空気の挙動

  SAITO MASAHIKO

  第17回地下環境水文学に関する研究集会, Nov. 2016, Japanese, つくば市, Domestic conference

  Oral presentation


• Numerical simulation of solute transport in heterogeneous porous media using the stochastic fractal model

  SAITO MASAHIKO

  Collaboration among mathematics, engineering and industry on various problems in infrastructure and environment, Oct. 2016, Japanese, Fukuoka, Japan, International conference

  Oral presentation


• Point dilution test and numerical evaluation of the hydraulic conductivity distribution

  Nakagawa Kei, Saito Masahiko, Amano Hiroki

  43rd IAH Congress, Groundwater and society: 60 years of IAH, Sep. 2016, Japanese, Montpellier, France, International conference

  Oral presentation


• 表層地盤におけるフィンガー流の発生形態と巨視的分散長の評価

  SAITO MASAHIKO

  土木学会水工学委員会水文部会 第16回地下環境水文学に関する研究集会, Nov. 2015, Japanese, 名古屋市, Domestic conference

  Oral presentation


• NUMERICAL STUDY ON MACROSCOPIC DISPERSION IN UNSATURATED VERTICAL INFILTRATION FIELD

  SAITO MASAHIKO, NAKAGAWA KEI

  Aqua 2015 - 42nd IAH Congress, Sep. 2015, English, International Association of Hydrogeologists, Rome, Italy, In recent years, the pollution of the groundwater is a serious problem in various areas. The advection dispersion analysis is usually used for dealing with groundwater pollution problems. The macroscopic dispersivity is one of the most important parameter to solve the advection-dispersion equation (AED) at the field scale. The macroscopic dispersion is caused by the variance of, International conference

  Poster presentation


• 都市型水害軽減を目的とした雨水浸透施設の適地選定のための地盤工学的手法の提案

  BAEK Je-Min, SHIBUYA Satoru, SAITO MASAHIKO, HUR Jin-Suk, HASHIMOTO Masaki, KATAOKA Satsuki, KOBATA Hiroyuki, SAITO Manabu, HIRAI Kanna

  第59回地盤工学シンポジウム, Nov. 2014, Japanese, 公益社団法人 地盤工学会, 長野県長野市 長野市生涯学習センター, Recently in urban cities in Japan, water hazards called generally as ‘urban flooding’ have been frequent when the urban cities were attached by heavy rainfall. In cope with such urban-type flooding, infiltration facilities are often introduced, with which the seepage of rainwater into ground is promoted. Shibuya et al. (2013) has conducted comprehensive research, in which the 3, Domestic conference

  Oral presentation


• フィンガー流発生時における不飽和帯の分散長の性質について

  SAITO MASAHIKO, 山北 和之

  第1５回地下環境水文学に関する研究集会, Oct. 2014, Japanese, 公益社団法人土木学会 水工学委員会水文部会, 富山県富山市 富山国際会議場, Domestic conference

  Oral presentation


• ３次元表層地盤モデルを用いた広域地下水流動解析結果の検証事例

  白 濟民, 古宮 雅之, SAITO MASAHIKO, 澁谷 啓, 許 晋碩, 小畑 博之, 齋藤 学, 村地 恵里奈

  第49回地盤工学研究発表会, Jul. 2014, Japanese, 公益社団法人 地盤工学会, 福岡県北九州市, Domestic conference

  Oral presentation


• 2009 年台風9 号豪雨により兵庫県佐用町で発生した斜面崩壊のメカニズムの考察－崖錐堆積物斜面の崩壊事例 (その2)－

  臼井 亮太, 鏡原 聖史, 文岩 秀貴, 澁谷 啓, 片岡 沙都紀, SAITO MASAHIKO

  第49回地盤工学研究発表会, Jul. 2014, Japanese, 公益社団法人 地盤工学会, 福岡県北九州市, Domestic conference

  Oral presentation


• 不飽和地盤内の巨視的分散長の性質について

  SAITO MASAHIKO

  第14回地下環境水文学に関する研究集会, Oct. 2013, Japanese, (社)土木学会 水工学委員会 水文部会, キャンパスイノベーションセンター東京, Domestic conference

  Oral presentation


• Numerical Evaluation of Nitrate Pollution Remediation

  NAKAGAWA KEI, SAITO MASAHIKO, Ronny Berndtsson

  8th IAHS International Groundwater Quality Conference, Apr. 2013, English, Gainesville, Florida USA, International conference

  Oral presentation


• 不均一地盤内の流速分布統計的性質と水みち形成について

  SAITO MASAHIKO

  第12回地下環境水文学に関する研究集会, Nov. 2012, Japanese, 香川大学, Domestic conference

  Oral presentation


• 飽和不均一地盤内の流速分布の性質に関する研究

  KURAMOTO TAKUYA, SAITO MASAHIKO

  土木学会第67回年次学術講演会, Sep. 2012, Japanese, 名古屋大学, Domestic conference

  Oral presentation


• 不飽和浸透時における巨視的分散長の性質に関する基礎的研究

  HONDA TAKAYUKI, KOKADO YASUTO, SAITO MASAHIKO

  土木学会第67回年次学術講演会, Sep. 2012, Japanese, 名古屋大学, Domestic conference

  Oral presentation


• シラス台地における地下水汚染の進行と回復についての数値計算

  NAKAGAWA KEI, SAITO MASAHIKO, MOMII KAZUO

  日本地下水学会2012年秋季講演会, Sep. 2012, Japanese, 鹿児島大学, Domestic conference

  Oral presentation


• 層状異方性不均一場における巨視的分散長の性質に関する検討

  齋藤 雅彦

  第11回地下環境水文学に関する研究集会, Nov. 2011, Japanese, (社)土木学会水工学委員会水文部会, 長崎大学 環境科学部 雲仙Eキャンレッジ交流センター, Domestic conference

  Oral presentation


• 土壌カラムを用いた植生が地下水や土壌に及ぼす影響についての検討

  中川 啓, 黒江 理恵, 安田 裕, 藤井 義晴, 齋藤 雅彦

  日本地下水学会2011年秋季講演会, Oct. 2011, Japanese, (財)広島市未来都市創造財団西区民文化センター, Domestic conference

  Oral presentation


• 斜面内の移流分散過程における降雨パターンの影響について

  本田 貴之, 西田 広大, 齋藤 雅彦

  土木学会第66回年次学術講演会, Sep. 2011, Japanese, 愛媛大学, Domestic conference

  Oral presentation


• 異方性不均一場における巨視的分散長の性質について

  西村 由紀子, 星野 大介, 齋藤 雅彦

  土木学会第66回年次学術講演会, Sep. 2011, Japanese, 愛媛大学, Domestic conference

  Oral presentation


• Quantitative Evaluation of Macroscopic Longitudinal Dispersivity for One-Dimensional Flow

  M. SAITO, Y. NISHIMURA, D. HOSHINO, K. NAKAGAWA

  ModelCARE2011, Sep. 2011, English, Helmholtz Centre for Environmental Reserach – UFZ, International conference

  Poster presentation


• 不均一地盤モデルを用いた巨視的分散長の推定方法に関する研究

  齋藤 雅彦, 西村 由紀子

  第11回地下環境水文学に関する研究集会, Oct. 2010, Japanese, 社団法人 土木学会, 沖縄, Domestic conference

  Oral presentation


• 斜面内の降雨浸透および移流分散過程に関する模型実験と数値シミュレーション

  西田 広大, 齋藤 雅彦

  土木学会第65回年次学術講演会, Sep. 2010, Japanese, 社団法人 土木学会, 北海道, Domestic conference

  Oral presentation


• 一次元移流分散現象における巨視的分散長の性質に関する一考察

  西村 由紀子, 齋藤 雅彦

  土木学会第65回年次学術講演会, Sep. 2010, Japanese, 社団法人 土木学会, 北海道, Domestic conference

  Oral presentation


• シラス台地における硝酸性窒素汚染進行メカニズムについての一考察

  中川 啓, 齋藤 雅彦

  土木学会第66回年次学術講演会, Sep. 2010, Japanese, 社団法人 土木学会, 北海道, Domestic conference

  Oral presentation


• 浸潤による盛土崩壊現象－室内実験及び数値シミュレーション－

  金 秉洙, 齋藤 雅彦, 加藤 正司, 澁谷 啓

  降雨と地震に対する斜面崩壊機構と安定性評価に関するシンポジウム, Oct. 2009, Japanese, 社団法人 地盤工学会, 東京, Domestic conference

  Oral presentation


• 臨海部の塩水侵入現象における地盤の不均一性の影響

  高山 裕介, 齋藤 雅彦

  土木学会第64回年次学術講演会, Sep. 2009, Japanese, 社団法人 土木学会, 福岡, Domestic conference

  Oral presentation


• 不飽和鉛直浸透場における物質輸送の数値シミュレーション

  齋藤 雅彦

  第10回地下環境水文学に関する研究集会, Sep. 2009, Japanese, 社団法人 土木学会, 福岡, Domestic conference

  Oral presentation


• ジオシンセティクスを用いたL型排水盛土防水工の実物大実験

  原 健二, 三井 仁哉, 三宗 桂司, 齋藤 雅彦, 鳥居 宣之, 澁谷 啓

  第44回地盤工学研究発表会, Aug. 2009, Japanese, 社団法人 地盤工学会, 神奈川, Domestic conference

  Oral presentation


• 震災時の用水確保に向けた水道事業体と地域社会との協同のあり方～「緊急時の用水確保に対する研究会」の活動～

  齋藤 雅彦, 沖村 孝, 有木 康雄, 平山 修久, 鍬田 泰子

  第60回全国水道研究発表会講演集, May 2009, Japanese, 社団法人 日本水道協会, 埼玉, Domestic conference

  Oral presentation


• １次元移流分散問題に関する３次元数値実験

  Masahiko SAITO

  第9回地下環境水文学に関する研究集会, Nov. 2008, Japanese, 東京, Domestic conference

  Oral presentation


• 不飽和-不均一場への浸透過程についての室内実験と数値計算

  中川 啓, 齋藤 雅彦

  2008年度土壌物理学会講演要旨集, Oct. 2008, Japanese, 三重, Domestic conference

  Poster presentation


• 「L型排水盛土防水工」に関する模型実験と排水効果の簡易評価手法について

  東 修平, 齋藤 雅彦, 原 健二, 三井 仁哉, 澁谷 啓

  土木学会第63回年次学術講演会, Sep. 2008, Japanese, 仙台, Domestic conference

  Oral presentation


• 地震発生から５０日目の四川（綿陽～安県～北川自治県周辺について）

  齋藤 雅彦

  第2回四川大地震報告会（オープンゼミナール）, Jul. 2008, Japanese, 神戸大学, Domestic conference

  Oral presentation


• 「L型配置ジオシンセティックス盛土排水工」の提案

  澁谷 啓, 齋藤 雅彦, 原 健二, 三井 仁哉

  第43回地盤工学研究発表会, Jul. 2008, Japanese, 広島, Domestic conference

  Oral presentation


• L型配置ジオシンセティックス盛土排水工の模型実験と数値シミュレーション

  原 健二, 齋藤 雅彦, 三井 仁哉, 澁谷 啓

  第43回地盤工学研究発表会, Jul. 2008, Japanese, 広島, Domestic conference

  Oral presentation


• 不均一場における不飽和鉛直浸透過程の室内実験と数値シミュレーション

  SAITO Masahiko

  第8回地下環境水文学に関する研究集会, Nov. 2007, Japanese, 土木学会水工学委員会水文部会, 和歌山市, Domestic conference

  Oral presentation


• FEM Analysis of Fingering Flow in Non-Uniform Porous Media

  SAITO Masahiko

  Univ. of Pittsburgh & Kobe Univ.(RCUSS) Symposium in Pittsburgh, Sep. 2007, English, ピッツバーグ大学, 神戸大学, Pittsburgh, International conference

  Oral presentation


• 多層地盤内および湛水浸潤時におけるフィンガリング現象の有限要素解析

  SAITO Masahiko, NAKAHIRA Takashi

  金沢大学環日本海域環境研究センターセミナー,「土壌の不均質性の解析とその汚染対策への応用」, Jun. 2007, Japanese, 金沢大学環日本海域環境研究センター, 金沢市, Domestic conference

  Invited oral presentation


• FFTを応用した定常揚水試験による透水係数分布の推定

  NAGATA Kenji, SAITO Masahiko

  平成19年度土木学会関西支部年次学術講演会, May 2007, Japanese, 土木学会関西支部, 吹田市, Domestic conference

  Oral presentation


• 鋼矢板護岸を用いた小規模都市河川の壁面粗度係数に関する模型実験

  Takashi NAKAHIRA, Masahiko SAITO, Junichi ICHINARI

  土木学会第61回年次学術講演会, Sep. 2006, Japanese, 社団法人土木学会, 立命館大学, Domestic conference

  Oral presentation


• 鉛直浸透過程における間隙空気の影響に関する室内実験と数値シミュレーション

  Hiroaki MASAKI, Soichiro YAGI, Masahiko SAITO, Junichi ICHINARI

  土木学会第61回年次学術講演会, Sep. 2006, Japanese, 社団法人土木学会, 立命館大学, Domestic conference

  Oral presentation


• 分散長のスケール依存性と透水係数の空間分布特性の関係について

  齋藤 雅彦

  第6回地下環境水文学に関する研究集会, Nov. 2005, Japanese, (社)土木学会水工学委員会水文部会，金沢大学COE, 石川県金沢市, Domestic conference

  Oral presentation


• フラクタル理論による不均一地盤のモデル化と地下水・浸透流解析への応用

  齋藤 雅彦

  平成17年度財団法人建設工学研究所秋季学術講演会, Nov. 2005, Japanese, 財団法人建設工学研究所, 神戸市産業振興センター, Domestic conference

  Oral presentation


• 兵庫県出石郡出石町鳥居を対象とした高解像度氾濫シミュレーション

  OZONO Masashi, TSUBAKI Ryota, FUJITA Ichiro, KAWATANI Kakeshi, SAITO Masahiko, KANDA Keiichi

  土木学会第60回年次学術講演会, Sep. 2005, Japanese, 土木学会, 早稲田大学, Domestic conference

  Oral presentation


• 3次元斜面における降雨浸透過程の数値解析

  齋藤 雅彦

  平成16年度 京都大学防災研究所 研究集会（一般） １６Ｋ-０５ 流体―不飽和土系ダイナミクスの最近の進歩と環境防災への適用, Sep. 2004, Japanese

  Oral presentation


• 間隙空気の運動を考慮した降雨浸透過程の数値シミュレーション

  齋藤 雅彦

  第5回地下環境水文学に関する研究集会, Jun. 2004, Japanese

  Oral presentation


• 復水を伴う地下水低下工法における難透水層の透水性の影響

  衣笠 秀隆, 川谷 健, 齋藤 雅彦

  土木学会第57回年次学術講演会, Sep. 2002, Japanese

  Oral presentation


• 臨海地帯水層への塩水侵入現象の数値シミュレーション

  野沢 修介, 川谷 健, 齋藤 雅彦

  土木学会第57回年次学術講演会, Sep. 2002, Japanese

  Oral presentation


• 地下水低下工法における復水および難透水層の透水性の影響について

  衣笠 秀隆, 川谷 健, 齋藤 雅彦

  平成14年度土木学会関西支部年次学術講演会, May 2002, Japanese

  Oral presentation


• FEM解析による臨海地帯水層内の塩水くさびの形状と挙動の検討

  野沢 修介, 川谷 健, 齋藤 雅彦

  平成14年度土木学会関西支部年次学術講演会, May 2002, Japanese

  Oral presentation


• 多層帯水層の地層構造と塩水侵入形態の関係についての有限要素解析による検討

  蓮井 一雄, 衣笠 秀隆, 齋藤 雅彦, 川谷 健

  土木学会第56回年次学術講演会, Oct. 2001, Japanese

  Oral presentation


• 2 次元移流分散問題へのSUPG 法の適用における要素サイズの算定に関する一考察

  野沢 修介, 蓮井 一雄, 齋藤 雅彦, 川谷 健

  土木学会第56回年次学術講演会, Oct. 2001, Japanese

  Oral presentation


• 不均質地盤への高圧空気侵入に関する数値シミュレーション

  岡野 誠二, 川谷 健, 齋藤 雅彦

  平成12年度土木学会関西支部年次学術講演会, Jun. 2000, Japanese

  Oral presentation


• 臨海地帯水層における塩水侵入現象の数値解析

  正木 よし子, 川谷 健, 齋藤 雅彦

  平成12年度土木学会関西支部年次学術講演会, Jun. 2000, Japanese

  Oral presentation


• 1次元浸透場における透水係数の不均質性

  岡野 誠二, 齋藤 雅彦, 川谷 健

  土木学会第54回年次学術講演会, Sep. 1999, Japanese

  Oral presentation


• 高圧空気貯蔵に関わる岩盤内の水・空気浸透流の数値解析

  新田 昭, 川谷 健, 齋藤 雅彦

  土木学会第54回年次学術講演会, Sep. 1999, Japanese

  Oral presentation


• 漏水に伴う地下水面低下量の計測に基づく加圧層の透水性評価

  土山 滋郎, 川谷 健, 齋藤 雅彦

  土木学会第52回年次学術講演会, Sep. 1998, Japanese

  Oral presentation


• 岩盤亀裂の不規則性を考慮した圧縮空気貯蔵施設の漏気性解析

  齋藤 雅彦, 川谷 健

  土木学会第53回年次学術講演会, Sep. 1998, Japanese

  Oral presentation


• 圧縮空気貯蔵施設の漏気性に対する圧力変動の影響について

  齋藤 雅彦, 川谷 健, 新田 昭

  土木学会第53回年次学術講演会, Sep. 1998, Japanese

  Oral presentation


• 地下圧縮空気貯蔵施設における圧力変動の影響について

  齋藤 雅彦, 川谷 健

  第33回地盤工学研究発表会, Jul. 1998, Japanese

  Oral presentation


• 圧力変動を考慮した無覆工圧縮空気貯蔵施設の漏気性解析

  齋藤 雅彦, 川谷 健, 沢田 高志

  平成10年度土木学会関西支部年次学術講演会, May 1998, Japanese

  Oral presentation


• 飽和地盤への高圧空気侵入の数値解の安定性について

  川谷 健, 齋藤 雅彦, 新田 昭

  平成10年度土木学会関西支部年次学術講演会, May 1998, Japanese

  Oral presentation


• Determination of the Peak Runoff in a Small River Basin

  Takeshi KAWATANI, Masahiko SAITO, Asare-Boafo EMMANUEL

  平成10年度土木学会関西支部年次学術講演会, May 1998, English

  Oral presentation


• 岩盤亀裂における層流から乱流への遷移に関する実験的研究

  市成 準一, 川谷 健, 齋藤 雅彦

  土木学会第52回年次学術講演会, Sep. 1997, Japanese

  Oral presentation


• 地下水低下工法における揚水効果に関する一考察

  齋藤 雅彦, 川谷 健

  土木学会第52回年次学術講演会, Sep. 1997, Japanese

  Oral presentation


• 不圧帯水層からの漏水が揚水時の被圧地下水流に及ぼす影響について

  川谷 健, 齋藤 雅彦, 土山 滋郎

  第32回地盤工学研究発表会, Jul. 1997, Japanese

  Oral presentation


• 加圧層を含む地盤の透水係数の逆解析

  齋藤 雅彦, 川谷 健

  第32回地盤工学研究発表会, Jul. 1997, Japanese

  Oral presentation


• 地下水低下工法における止水壁周辺の地下水のモデル化に関する一考察

  齋藤雅彦, 川谷健

  平成9年度土木学会関西支部年次学術講演会, May 1997, Japanese

  Oral presentation


• 逆解析による漏水性加圧層の透水性の評価

  齋藤 雅彦, 川谷 健, 土山 滋郎

  平成9年度土木学会関西支部年次学術講演会, May 1997, Japanese

  Oral presentation


• 加圧層からの漏水が被圧地下水流に及ぼす影響について

  齋藤 雅彦, 川谷 健, 山本 剛史

  平成9年度土木学会関西支部年次学術講演会, May 1997, Japanese

  Oral presentation


• 杭の動的支持力推定法の適用性の検討（1）

  布施 洋一, 齋藤 雅彦, 小林 洋一, 岡本 隆, 沖 健

  第27回土質工学研究発表会, Jun. 1992, Japanese

  Oral presentation


• 制約付きシンプレックス法による被圧帯水層のかん養・漏水量の推定

  川谷 健, 齋藤 雅彦, 山元 岳司

  土木学会第45回年次学術講演会, Sep. 1990, Japanese

  Oral presentation


• 逆解析による岩盤亀裂系の透水性の評価

  川谷 健, 齋藤 雅彦, 藤多 真也

  土木学会第45回年次学術講演会, Sep. 1990, Japanese

  Oral presentation

• 日本地下水学会

  2007 - Present


• 社団法人地盤工学会


• 社団法人土木学会

• 斜面内浸透流における水みちの生成と発展に関する研究

  斎藤 雅彦

  日本学術振興会, 科学研究費助成事業, 基盤研究(C), 神戸大学, 01 Apr. 2022 - 31 Mar. 2026


• 豪雨時における斜面内浸透流の再検討－不均一性と間隙空気の役割について

  斎藤 雅彦

  学術研究助成基金助成金／基盤研究(C), Apr. 2016 - Mar. 2019

  Competitive research funding


• 豪雨による都市型複合地盤災害軽減のための学際研究

  澁谷 啓

  科学研究費補助金／基盤研究(B), Apr. 2015 - Mar. 2018

  Competitive research funding


• Evaluation of aquifer structure and groundwater flow by using surface temperature data

  NAKAGAWA Kei

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Nagasaki University, 01 Apr. 2014 - 31 Mar. 2017

  In this study, thermal transport experiments and numerical simulations were performed to test the proposed method to investigate heterogeneous groundwater flow and hydro-geological structure by the use of thermal imaging of the soil surface. The results of the study clearly showed that the thermal distribution of the soil surface is affected by subsurface impermeable obstacles. However, when a thinner cover was present, it was simple to determine the distribution of the obstacles and the groundwater flow path. Numerical simulation with obstacles could be used to reproduce the experimental results of thermal transport by using parameters determined with the simulation without obstacles.


• Proposal of tracer test method in the groundwater contamination field and clarification of pollution mechanism

  NAKAGAWA Kei

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Nagasaki University, 01 Apr. 2012 - 31 Mar. 2017

  In this study, the use of coprostanol, the fecal contamination indicator, was examined as a groundwater tracer. Point dilution tests were performed as tracer tests in the field to investigate the vertical distribution of groundwater characteristics and spatial-temporal distribution of groundwater chemistry. The results showed that it was practically impossible to use the tracer test in the field. However, coprostanol did show potential to indicate the source of nitrate pollution in groundwater. Further research will be done to prove this method.


• 不飽和・不均一地盤における巨視的分散長の定量的評価方法に関する研究

  齋藤 雅彦

  学術研究助成基金助成金／基盤研究(C), Apr. 2013 - Mar. 2016, Principal investigator

  Competitive research funding


• ジオシンセティックス排水材を用いた盛土防水工に関する研究

  澁谷 啓

  科学研究費補助金／基盤研究(A), 2010

  Competitive research funding


• Developing reliable methods for the design of the immobilization of heavy metals in soil : for the application to heterogeneous systems.

  KAWANISHI Takuya, SATO Tsutomu, SAITO Masahiko, FUKUSHI Keisuke

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kanazawa University, 2007 - 2009

  We summarized the effects of pH, coexisting substances, etc. on the adsorption of arsenic on the adsorbent, schwertmannite, with surface complex model. We found that in the heterogeneous water distribution, diffusive efflux of pollutants obeys power law with the exponent ranging from minus 1.0 to minus 0.5, whereas in regular systems the exponent is fixed to minus 0.5. In addition, we validated the effectiveness of barrier system for immobilization with laboratory experiments. We successfully constructed several sub-models for the design of immobilization in heterogeneous polluted sites.


• 山腹斜面における廃棄物の不法投棄に伴う汚染物質の拡散挙動の解明

  斎藤 雅彦

  科学研究費補助金／基盤研究(C), 2009

  Competitive research funding


• 豪雨・地震時における道路補強盛土安定性の総合評価システムの構築

  澁谷 啓

  科学研究費補助金／基盤研究(B), 2007

  Competitive research funding