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TANAKA KenjiGraduate School of Agricultural Science / Department of Agricultural Engineering and Socio-EconomicsAssistant Professor
Research activity information
■ Award- Sep. 2025 農業農村工学会, 優秀ポスター賞, 頭首工撤去に伴う濁水流下状況の変化が取水管理方法に及ぼす影響
- Oct. 2024 農業農村工学会北海道支部, 支部賞, 北海道石狩平野の水田利用の実態と課題
- May 2024 国土交通省 北海道開発技術研究発表会, 寒地土木研究所長奨励賞, Google Earth Engineによる農業地域の実態把握事例
- Feb. 2022 国土交通省 北海道開発技術研究発表会, 北海道開発局長奨励賞, 震災後の厚真川の濁水状況および取水管理方法の検討
- Dec. 2020 農業農村工学会北海道支部, 支部賞, 斜面崩壊土砂に起因した濁水発生に伴う農業用水取水のリスク管理に関する一連の研究
- Nov. 2019 国土交通省, 令和元年度国土技術研究会 優秀賞, 北海道胆振東部地震による斜面崩壊土砂に起因した河川の濁水発生状況および農業取水のリスク管理
- Sep. 2019 農業農村工学会, 優秀論文賞, 高濃度濁水が扇状地の水田浸透量・河川伏流量に及ぼす影響
- May 2019 国土交通省 北海道開発技術研究発表会, 寒地土木研究所長賞, 厚真川における高濃度濁水の発生に関する緊急調査報告
- Nov. 2016 農業農村工学会京都支部, 研究奨励賞, 土砂崩壊に伴う高濃度濁水が手取川扇状地水田の地下水涵養機能に与える影響
- Mar. 2014 地球変動適応科学研究機関, 優秀ポスター賞, アジア天水田稲作における収量安定化戦略を考慮した米生産量解析
- Lead, Jun. 2026, 農業農村工学会論文集, 94(1) (1), I_67 - I_77, Japanese[Refereed]Scientific journal
- Jun. 2024, 農業農村工学会論文集, 92(1) (1), I_119 - I_131[Refereed]
- Sep. 2023, 農業農村工学会誌, 91(9) (9), 621 - 624北海道石狩平野の水田利用の実態と課題[Refereed]
- Aug. 2022, 土木学会論文集G(環境), 78(5) (5), I_271 - I_278, JapaneseSWATによる酪農営農状況および周辺環境の変化に対する河川水質解析[Refereed]Scientific journal
- Lead, Dec. 2020, 農業農村工学会論文集, 88(2) (2), I_303 - I_311平成30年北海道胆振東部地震以降の流域の濁水発生状況および濁水取水の影響を回避するための農業用水の取水管理方法の検討[Refereed]Scientific journal
- Oct. 2019, Journal of Rainwater Catchment Systems, JapaneseV字ノッチ傾斜隔壁魚道の隔壁形状と枚数が魚類の遡上率に与える影響[Refereed]Scientific journal
- May 2019, 農業農村工学会誌, 87(5) (5), 377 - 380, Japanese斜面崩壊土砂に起因した濁水発生に伴う農業用水取水のリスク管理[Refereed]Scientific journal
- Feb. 2019, Hydrological Sciences Journal, 64(2) (2), 241 - 253, EnglishDevelopment of a floodwater-level estimation method using satellite images and a digital elevation model for the Mekong floodplain[Refereed]Scientific journal
- Japan Rainwater Catchment Systems Association, Jan. 2019, Journal of Rainwater Catchment Systems, 24(2) (2), 1 - 7, English
Sloped-weir fishways have been proposed to improve aquatic connectivity and restore fish migrations in agricultural ditches. However, the most suitable design for such fishways has not been identified. The goals of this study were to identify the most suitable sloped-weir fishway design for ascending fish and to determine suitable flow rates when fish ascend the fishway. Nine types of weirs were made by changing the angle of the weir slope (α) and that of the V-shaped notch on the upper surface of the weir (β). Several volumetric flow rates (1.58-1.98 L/s, 5.09-5.37 L/s, 9.24-9.54 L/s, and 14.35-14.43 L/s) were used in the experiments for each weir type. The ascent rates for three fish species (Oryzias sakaizumii, Misgurnus anguillicaudatus, and Carassius sp.) were determined for each type weir in the experimental flume. Hydraulic conditions were measured, including velocity and depth of water flowing over the weir, and flow velocity and depth in the area downstream of the weir. We identified two types of suitable weirs for O. sakaizumii: one with α = 60°, β = 5°, and the other: α = 45°, β = 30°; O. sakaizumii was not affected by flow velocity while ascending the fishway. The three weir types with β = 30° were suitable for the ascent of M. anguillicaudatus, which ascended well when the flow rate was above 5 L/s. For Carassius sp., all weir types were well, especially with flow rates over 9 L/s. In addition, our results suggest that the weir with α = 45°, β = 30° was suitable for all three species.
[Refereed] - 農業土木学会, Jul. 2018, 農業農村工学会誌, 86(7) (7), 595 - 598, JapaneseInfluence of Turbidity Water Occurrence on Agricultural Water, Groundwater and Ecological System in Tedori Alluvial Fan[Refereed]Scientific journal
- The Japanese Society of Irrigation, Drainage and Rural Engineering, Jun. 2018, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 86(1) (1), I_47 - I_54, Japanese
Huge landslides in the upper reaches of the Tedori River have caused a long period of high turbidity in the river, predominant since May 2015. This turbidity has caused concerns about recharge of groundwater in the downstream alluvial fan. In this study, the measurements of paddy percolation and underflow water, before and after the occurrence of high turbidity, were used to examine its influence on groundwater recharge functions. The measurements included water requirement rates in an area covering the Tedori River alluvial fan and river discharge observations in the section of the river that flows through the alluvial fan. The results revealed that the amount of paddy percolation decreased significantly in response to the elevated turbidity, and the volume and width of the riverbed underflow water were reduced. The amount of groundwater recharge was estimated based on these measurements, which revealed that groundwater recharge from paddy percolation was reduced by 270 mm/year (36%), and the recharge from riverbed underflow water was reduced by 591 mm/year (61%). The total groundwater recharge was reduced by 861 mm/year (36%), a value that corresponded favorably to the empirical groundwater level measurements.
[Refereed]Scientific journal - Mar. 2018, 応用水文, (30) (30), 93‐101, JapaneseAnalysis of cropping patterns in the Gash Delta, Sudan using Landsat-8 images
- 農業土木学会, Mar. 2018, 農業農村工学会誌, 86(3) (3), 207 - 210, JapaneseUAVとSfM (StructurefromMotion)による高精度な3次元地形モデルの作成方法に関する検討[Refereed]Scientific journal
- THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, May 2017, Journal of Japan Society of Hydrology and Water Resources, 30(3) (3), 173 - 180, Japanese
Because of huge landslides in the upper reaches of the Tedori River, highly concentrated turbid water with average concentration of 585 mg/L and maximum concentration of 4,012 mg/L has been discharged continuously into the river since May 2015. This study was conducted to evaluate the high-turbidity water effects on percolation from paddy fields in the Tedori River alluvial fan. Water requirement rates in the alluvial fan paddy fields were investigated in 2014 when huge landslides were not occurring and in 2016 when huge landslides were occurring. Changes in percolation from the paddy fields were then analyzed. Average percolation from all paddy fields was found to be 12.4 mm/day in 2014 and 7.9 mm/day in 2016, indicating a significant decrease in percolation. Moreover, paddy fields from which percolation decreased were distributed in the middle and lower reaches of the alluvial fan. Results suggest that fine soils are supplied to the middle and lower reaches of the alluvial fan. We estimated the groundwater recharge based on the observation results, which revealed that the groundwater recharge from the paddy fields was reduced by 36 %. The total groundwater recharge was reduced by 25 %.
[Refereed]Scientific journal - Mar. 2017, PADDY AND WATER ENVIRONMENT, 15(2) (2), 263 - 276, English[Refereed]Scientific journal
- Mar. 2017, JOURNAL OF HYDROLOGY, 546, 289 - 298, English[Refereed]Scientific journal
- 本研究では、林内とオープンスペースにおける積雪・融雪を比較した研究論文を探し、これらの研究結果を整理することで、林内の積雪とオープンスペースの積雪のどちらの方が遅くまで残るかを明らかにすることを試みた。収集したデータおよび観測データから、林内における消雪日(SDDf)と隣接するオープンエリアにおける消雪日(SDDo)を読み取り、林内とオープンスペースの消雪日の違い(ΔSDD)を求めた。さらに、ΔSDDと気象条件(冬期降水量(mm)、冬期平均気温(℃)、冬期平均風速(m/s))との関係について調べた。その結果、冬期平均気温が低くなるにつれて林内の積雪の方が長く残ること、風速が強くなるにつれて林内の積雪の方が遅くまで残る傾向があることなどが分かった。さらに、消雪日の違いを目的変数、冬期平均気温、冬期降水量、冬期平均風速を説明変数として、決定木モデルを適用した。その結果、冬期平均風速が2.0 m/sを境にして分岐しており、これよりも風速が強いエリアにおいては林内の方がオープンスペースよりも積雪が長く残る傾向となった。また、風速が2.0 m/sより弱い場合、冬期平均気温が2.3℃よりも低ければ林内の積雪の方が長く残り、2.3℃よりも高ければオープンスペースの積雪の方が長く残る結果となった。THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2017, Proceeding of Annual Conference, 30, 71 - 71, Japanese
- Jan. 2017, JOURNAL OF AGRICULTURAL METEOROLOGY, 73(1) (1), 31 - 44, English[Refereed]Scientific journal
- Dec. 2016, 農業農村工学会誌, 84(12) (12), 1118‐1119, Japanese高精度温暖化影響評価のための多雪地帯における積雪データセットの構築
- Penerbit UTM Press, 2016, Jurnal Teknologi, 78(1-2) (1-2), 33 - 38, English[Refereed]Scientific journal
- In Mekong river basin, population increase and economic growth may cause the water pollution problem in the future. This study aimed to assess spatial water quality environment in main stream and tributaries of Mekong river. For that purpose, liner regression model to estimate unit of nutrient pollution loading and water circulation model to estimate river discharge were developed, and then river nutrient concentration was also calculated. As a result, estimated unit of nutrient pollution loading expressed the characteristics of wastewater treatment process and agricultural level in Mekong river basin. Calculated river discharge and annual average river nutrient concentration were good agreement with observed data.Japan Society of Civil Engineers, Sep. 2014, PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH, 70(5) (5), 293 - 298, Japanese[Refereed]Scientific journal
- Springer, 2014, The 2nd International Conference on Serviceology, 198-202 - 369, English[Refereed]International conference proceedings
- 2014, ICHE 2014, 347-353, EnglishEvaluation of Automatic Irrigation System in Paddy for Water and Energy Saving and Environmental ConservationInternational conference proceedings
- In Mekong river basin, productivity of rice is unstable because more than 70 % of paddy fields were classified as rain-fed paddy. In addition, future global climate change and land use change will make negative impact on rice production in this region. In order to analyze the stability of rice production quantitatively, it is important to consider the rice farming management such as strategy of rain-fed rice yield stabilization. In this study, rice production model was developed combined with distributed type water circulation model. Developed rice production model was applied to Mekong river basin, and verified with the statistic data of Northeast Thailand from 1986 to 1995. As a result, rice planted area, yield, production was good agreement with statistic data, especially errors in rice yield was improved by considering the strategy of rain-fed rice yield stabilization.Japan Society of Civil Engineers, 2014, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 70(4) (4), I_277 - I_282, Japanese[Refereed]Scientific journal
- In Mekong river basin, population increase and rapid economical growth may cause the water pollution problem in the future. In this study, a liner regression model was developed by using annual nutrient load and spatial statistic data from GIS analysis. Estimated units of nutrient pollution loading of forest, agricultural land, human and cattle represented the characteristics of Mekong river basin such as agricultural level, lifestyle, waste water treatment, livestock intensity, and compared with literature values of Japan. The result of effluent ratio from each pollution factors at five observation stations showed that nutrient load from human and agricultural land were more dominant in downstream area. Then, spatial distribution of nutrients load on 1km grid resolution was calculated from estimated unit of nutrient pollution loading.The Japanese Society of Irrigation, Drainage and Rural Engineering, Apr. 2013, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 81(2) (2), 193 - 199, Japanese[Refereed]Scientific journal
- 2013, Journal of Developments in Sustainable Agriculture, 8, 25 - 31, EnglishFuture Water Use in Asia Monsoon Region : A Case Study in Indonesia[Refereed]Scientific journal
- 2020, 日本地理学会発表要旨集, (97) (97)Development of flood observation method and water temperature fluctuation analysis from satellite data in Tonle Sap
- 2019, 日本雨水資源化システム学会研究発表会講演要旨集, 27thトンレサップ湖における衛星データを用いた氾濫域・氾濫水位推定手法の開発
- 2018, 日本地球惑星科学連合大会予稿集(Web), 2018林内と林外における消雪日のメタ解析
- 2016, 農業農村工学会大会講演会講演要旨集(CD-ROM), 2016メコン川流域における米収量の分布予測に向けた天水田水循環に基づく作物生産モデル
- In Mekong river basin, productivity of rice is still low and unstable because more than 70 % of paddy fields were classified as rain-fed paddy. In addition, future global climate change and population growth will make negative impact on rice production in this region. In order to analyze the stability of rice production quantitatively, it is important to consider the groundwater hydrological environment. In this study, rice production model was developed combined with distributed type water circulation model. This model consists of three sub models, harvested area estimation model used of FAO-33, yield estimation model used of Monteith equations and FAO-56 and rainfall runoff model used of TOPMODEL. As a result, rice yield was good agreement with statistic data, and especially rice yield distribution was refined by the result of previous studies. By outputting refinement of rice yield distribution, the self-sufficiency balance can be evaluated on a regional scale.THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2016, Proceeding of Annual Conference, 29, 117 - 117, Japanese
- 2016, 日本雨水資源化システム学会研究発表会講演要旨集, 24th, 83‐84, Japanese干拓地における排水管理へのランダムフォレスト回帰モデルの適用
- 2016, 農業農村工学会京都支部研究発表会講演要旨集, 73rd, 168‐169, Japanese水田周辺魚類のためのV字ノッチ全面傾斜隔壁魚道の開発―ノッチ角5°の隔壁遡上率に影響を与える要因―
- In order to better understand the process of snow accumulation and melting, we surveyed snow depth at many points in a forested catchment using an inexpensive and robust observation method based on small temperature loggers. The study area was 800m×400m, and the number of observations was 21. Observations were conducted during three winter periods. We then investigated the relationships between snow depth, topographical information (elevation and aspect), and forest properties (canopy openness). We set snow depth as objective variable and elevation, aspect, and canopy openness as predictor variables and performed a multiple regression analysis. The results show that all variables are significant predictors of snow depth in the December to January period. Conversely, the correlation coefficient of aspect is the same as that of elevation during the snow melting season. Each regression coefficient is larger in a heavy snow year and is smaller in a light snow year, and the regression coefficients changed considerably over the winter period. These results indicate that the approach used in this study is useful to investigate snow accumulation and melting in a forested area.THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2016, Proceeding of Annual Conference, 29(0) (0), 83 - 83, Japanese
- 20 Aug. 2015, E-proceedings of PAWEES-INWEPF joint international conference 2015, PIJIC2015_29.pdf, EnglishModeling of rice harvested area and its impact on rice yield and production in Mekong river basin[Refereed]Introduction international proceedings
- 2015, 農業農村工学会大会講演会講演要旨集(CD-ROM), 2015ジャカルタ近郊の溜め池が有する水質浄化および洪水緩和機能
- 2015, 農業農村工学会大会講演会講演要旨集(CD-ROM), 2015地下水水文過程を考慮した地下水流動-作物生長結合モデルの構築
- 2015, 農業農村工学会関東支部大会講演会講演要旨, 66thラオス国立大学農学部SRI試験圃場における水生産性の評価
- 2015, 農業農村工学会関東支部大会講演会講演要旨, 66thメコン川流域における米収穫面積変動に伴う利用可能水量の不均一性を考慮した水循環-作物生産モデルの構築
- 2015, 農業農村工学会大会講演会講演要旨集(CD-ROM), 2015将来の人口増加がチタルム川流域の窒素負荷量に及ぼす影響の評価
- 2014, 地球環境研究論文集, 22メコン川流域における栄養塩排出原単位および河川水中の栄養塩濃度の推定
- 2014, 土木学会論文集 B1(水工学)(Web), 70(4) (4)DEVELOPMENT OF WATER CYCLING- CROP PRODUCTION MODEL CONSIDERING THE STRATEGY OF RAIN-FED RICE YIELD STABILIZATION IN MEKONG RIVER BASIN
- 土木学会, Sep. 2013, 地球環境シンポジウム講演集, 21, 143 - 148, Japanese水田の窒素負荷軽減に向けた止水管理の評価に関する調査検討結果
- 2013, 農業農村工学会大会講演会講演要旨集, 2013メコン川流域における水循環-作物生産モデルの構築
- 2013, Proceedings of ISRS2013(International Symposium on Remote Sensing 2013), EnglishDevelopment of river discharge and nitrogen estimation model in Citarum river basinIntroduction international proceedings
- 2012, 応用水文, (24) (24)流量・水質データおよび空間情報データを用いた窒素・リン原単位の推定
- 2012, 農業農村工学会大会講演会講演要旨集, 2012ラオス国KM6灌漑地区における水生産性の評価
- Joint work, Chapter11,142-150, Asian Development Bank Institute,, Apr. 2024Sociocultural Dimensions in Water Resources Management
- American Geophysical Union 2025, Dec. 2025, EnglishEffects of vegetation recovery in slope failures and removal of the headworks on agricultural water withdrawalPoster presentation
- 2025年度(第74回)農業農村工学会大会講演会, Sep. 2025, Japanese頭首工撤去に伴う濁水流下状況の変化が取水管理方法に及ぼす影響Poster presentation
- 2024年度(第73 回)農業農村工学会大会講演会, Sep. 2024濁水取水を想定した定水位透水試験およびポット栽培試験
- 2023年度(第72 回)農業農村工学会大会講演会, Aug. 2023衛星画像解析による酪農地域の飼料作物農地判別
- 第71回農業農村工学会北海道支部研究発表会, Nov. 2022, JapaneseSWATによる営農状況ごとの窒素流出量のシナリオ分析Oral presentation
- 2022年度(第71回)農業農村工学会大会講演会, Sep. 2022, Japanese濁水取水を想定した土壌カラムによる定水位透水試験Oral presentation
- 第70回農業農村工学会北海道支部研究発表会, Nov. 2021, Japanese震災後の厚真川における灌漑期・非灌漑期の濁水状況に関する考察Oral presentation
- 令和元年度国土交通省国土技術研究会, Nov. 2019, Japanese, Domestic conference北海道胆振東部地震による斜面崩壊土砂に起因した河川の濁水発生状況および農業取水のリスク管理Oral presentation
- 農業農村工学会北海道支部 第68回研究発表会, Oct. 2019, Japanese, Domestic conference斜面崩壊土砂による厚真川の濁水発生状況-2019年灌漑期における調査報告-Oral presentation
- 水文水資源学会第32回 2019年度 総会・研究発表会, Sep. 2019, Japanese, Domestic conference大規模酪農地帯における水質濃度と営農状況の関係Poster presentation
- 2019年度農業農村工学会大会講演会, Sep. 2019, Japanese, Domestic conference北海道胆振東部地震による斜面崩壊土砂に伴う濁水発生に関する調査報告Oral presentation
- 平成30年度北海道開発技術研究発表会, Feb. 2019, Japanese, Domestic conference厚真川における高濃度濁水の発生に関する緊急調査報告Oral presentation
- 平成30年度農業農村工学会大会講演会, Sep. 2018, Japanese, Domestic conferenceメコン下流域における衛星画像のみによる河川・氾濫原水位の推定Oral presentation
- 第74回農業農村工学会京都支部研究発表会, Oct. 2017, Japanese, Domestic conference衛星画像と数値標高モデルを用いた氾濫水位推定手法の開発Oral presentation
- 応用生態工学会金沢 第16回北信越ワークショップin石川, Oct. 2017, Japanese, Domestic conference高濃度濁水が下流扇状地の水田浸透量・河川伏流量に及ぼす影響Poster presentation
- 平成29年度農業農村工学会大会, Aug. 2017, Japanese, Domestic conference土砂崩壊に伴う高濃度濁水が手取川扇状地水田の地下水涵養機能に与える影響Oral presentation
- 第73回農業農村工学会京都支部研究発表会, Nov. 2016, Japanese, Domestic conference土砂崩壊に伴う高濃度濁水が手取川扇状地水田の地下水涵養機能に与える影響Oral presentation
- 水文水資源学会2016年度総会・研究発表会, Sep. 2016, Japanese, Domestic conference米収量分布の詳細化に向けた天水田水循環に基づく作物生産モデルOral presentation
- 平成28年度農業農村工学会大会, Aug. 2016, Japanese, Domestic conferenceメコン川流域における米収量の分布予測に向けた天水田水循環に基づく作物生産モデルOral presentation
- 第66回農業農村工学会関東支部研究発表会, Oct. 2015, Japanese, Domestic conferenceメコン川流域における米収量面積変動に伴う利用可能水量の不均一性を考慮した水循環-作物生産モデルの構築Oral presentation
- 平成27年度農業農村工学会大会, Sep. 2015, Japanese, Domestic conference地下水水文過程を考慮した地下水流動‐作物生長結合モデルの構築Oral presentation
- PAWEES-INWEPF Joint International Conference 2015, Aug. 2015, English, International conferenceModeling of Rice Harvested Area and Its Impact on Rice Yield and Production in Mekong River BasinOral presentation
- 平成25年度農業農村工学会大会講演会, Sep. 2013, Japanese, Domestic conferenceメコン川流域における水循環-作物生産モデルの構築Oral presentation
- 平成24年度農業農村工学会大会, Sep. 2012, Japanese, Domestic conferenceラオス国KM6灌漑地区における水生産性の評価Poster presentation
- 平成23年度農業農村工学会大会, Sep. 2011, Japanese, Domestic conference未観測流域における窒素排出原単位の推定Oral presentation
- JAPAN SOCIETY OF CIVIL ENGINEERS
- JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES
- THE JAPANESE SOCIETY OF IRRIGATION, DRAINAGE AND RURAL ENGINEERING
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2025 - Mar. 2029, CoinvestigatorDevelopment of a high-precision river load estimation method based on long-term low-frequency water quality data and evaluation of long-term characteristics of river water quality
- 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, Apr. 2025 - Mar. 2029, Principal investigator酪農流域の持続的な窒素循環に向けた有機質肥料の施用実態の解明および水質解析
- 公益社団法人 河川財団, 河川基金助成事業, 神戸大学大学院農学研究科, Apr. 2025 - Mar. 2026酪農地域の有機質肥料の施用実態が河川水質環境に及ぼす影響
- 日本学術振興会, 科学研究費助成 若手研究, Apr. 2019 - Mar. 2023, Principal investigator農業用水に及ぶ濁水取水の影響と対応策の検討ー胆振東部地震の山腹崩壊を事例としてーCompetitive research funding
- 農業農村工学会, 学術基金による研究助成, 石川県立大学, Apr. 2017 - Mar. 2018, Principal investigator土砂崩壊に伴う高濃度濁水が手取川扇状地の地下水涵養機能に与える影響
