Research activity information

• Feb. 2022 日本風力エネルギー学会, 優秀発表賞, メソ気象モデルによって算出される空気密度の精度検証

  見﨑豪之, 内山将吾, 大澤輝夫


• Mar. 2015 日本風工学会, 平成26年度優秀修士論文賞, WRF計算値を用いた沿岸海域における水平風速勾配に関する研究

• Mutsu 2020 Scanning LiDAR Experiment: Comparison of Dual and Single Scanning LiDAR Systems for Near‐Shore Wind Measurement

  Susumu Shimada, Tetsuya Kogaki, Mizuki Konagaya, Toshinari Mito, Takeshi Misaki, Kohei Hamada, Ryuzou Araki, Shizuka Ohhata, Yuko Ueda, Teruo Ohsawa

  ABSTRACT This paper reports the results of a validation experiment on dual and single scanning light detection and ranging (LiDAR) systems for near‐shore wind measurements. This experiment was conducted from November 2020 to August 2021 at the Mutsu Ogawara test site for offshore wind measurement in northern Japan. The accuracy of the wind speed and direction measured by dual and single scanning LiDAR systems (DSL and SSL, respectively) was investigated by comparing them with in situ observations by a 60‐m meteorological mast located approximately 1.5 km offshore. The accuracy of the SSL was found to be strongly influenced by the wind direction, whereas the 10‐min wind speeds and directions obtained by the DSL exhibited good agreement with the meteorological mast observations for all wind directions. In addition, a comparison of the turbulence intensity (TI) showed that the TI obtained by the SSL was significantly lower than that obtained by the cup anemometers, while that obtained by the DSL was in line with the cup observations. The accuracy of the potential annual energy production estimates was finally investigated. The results showed no apparent difference between the DSL and SSL. This long‐term experiment indicated that the SSL is suitable for assessing wind resources due to reduced technical and financial constraints in comparison to installing a meteorological mast offshore. However, the DSL would be useful for assessing not only wind resources but also site‐specific conditions, as it performed well for the TI measurements.

  Wiley, Mar. 2025, Wind Energy, 28(4) (4)

  [Refereed]

  Scientific journal


• Accuracy Verification of Multiple Floating LiDARs at the Mutsu-Ogawara Site

  Uchiyama, Shogo, Ohsawa, Teruo, Asou, Hiroshi, Konagaya, Mizuki, Misaki, Takeshi, Araki, Ryuzo, Hamada, Kohei

  Floating LiDAR systems (FLSs) may replace conventional offshore met masts, and they have been developed well in Europe. However, before using them in Japan, we must determine whether they demonstrate the same performance under the unique East-Asian meteorological and oceanographic conditions. Therefore, herein, we investigate the performance of FLSs by focusing on the differences among models. Four independent wind datasets from three FLSs were simultaneously verified against a reference met mast and vertical LiDAR at a Japanese site. The data availability was confirmed to vary from 62.7 to 98.0% over the period at 63 m. This was strongly affected by the system availability of the buoy and LiDAR, suggesting that buoy system robustness is key to better campaigns with higher data availability. The 10 min averaged wind speed and direction largely satisfied the Carbon Trust’s key performance indicators, with a low sensitivity to wave conditions depending on the buoy shape. The standard deviation of the wind speed and turbulence intensity had poorer accuracy than that of the 10 min averaged statistics because of the wave-induced buoy motion, especially for small buoys. In short, this paper provides an overview of a measurement by FLS in Japan. Also, the unique verification with multiple units suggests the need for a low-motion buoy or motion compensation to improve the measurement accuracy of the turbulence component.

  Jul. 2024, Energies, 17(13) (13), 3164, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Estimation of Nearshore Wind Conditions Using Onshore Observation Data with Computational Fluid Dynamic and Mesoscale Models

  Mizuki Konagaya, Teruo Ohsawa, Toshinari Mito, Takeshi Misaki, Taro Maruo, Yasuyuki Baba

  This study aimed to establish numerical models to replicate wind conditions for nearshore waters, sensitive to onshore topography, and to compare the characteristics of computational fluid dynamic (CFD) and mesoscale models. Vertical Doppler light detection and ranging (LiDAR) observation data were measured at an onshore site, which showed that wind conditions were affected by thermodynamic phenomena, such as land and sea breeze, and dynamical effects from neighboring onshore topography. The estimation accuracy of the CFD model depended on the height of the LiDAR data input. A height close to the target, such as the hub height of wind turbines, seemed appropriate as input data, considering that the accuracy of the wind speed shear replicated in a CFD numerical model may be uncertain. The mesoscale model replicated the wind through the thermodynamic effect and reliably estimated wind speed over nearshore waters without observation correction. Larger estimation errors were detected in the CFD model than in the mesoscale model, as the former could not account for thermodynamic effects. Wind conditions in water areas near complex coastlines may also be formed by thermodynamic factors, making analysis using a mesoscale model advantageous.

  MDPI AG, Oct. 2022, Resources, 11(11) (11), 100 - 100

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Model Inter-Comparison for PM2.5 Components over urban Areas in Japan in the J-STREAM Framework

  Kazuyo Yamaji, Satoru Chatani, Syuichi Itahashi, Masahiko Saito, Masayuki Takigawa, Tazuko Morikawa, Isao Kanda, Yukako Miya, Hiroaki Komatsu, Tatsuya Sakurai, Yu Morino, Kyo Kitayama, Tatsuya Nagashima, Hikari Shimadera, Katsushige Uranishi, Yuzuru Fujiwara, Tomoaki Hashimoto, Kengo Sudo, Takeshi Misaki, Hiroshi Hayami

  MDPI AG, Feb. 2020, Atmosphere, 11(3) (3), 222 - 222

  [Refereed]

  Scientific journal


• Accuracy Comparison of Coastal Wind Speeds between WRF Simulations Using Different Input Datasets in Japan

  Takeshi Misaki, Teruo Ohsawa, Mizuki Konagaya, Susumu Shimada, Yuko Takeyama, Satoshi Nakamura

  Lead, Jul. 2019, ENERGIES, 12(14) (14), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Evaluation of LFM-GPV and MSM-GPV as Input Data for Wind Simulation

  MISAKI Takeshi, OHSAWA Teruo

  Lead, Japan Wind Energy Association, 2018, Wind Energy, 42(4) (4), 72 - 79, Japanese

  [Refereed]


• WRFによって計算される海岸線付近の水平風速勾配の検証

  見崎豪之, 大澤輝夫, 香西克俊, 竹山優子, 馬場康之, 川口浩二

  Lead, 2017, 日本風工学会論文集, 42(2) (2)

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Comparison of WRF-based methods for wind resource assessment at an offshore site

  Teruo Ohsawa, Kazuki Ishigami, Takeshi Misaki, Yasuyuki Baba, Koji Kawaguchi

  2015, Proceedings of the International Offshore and Polar Engineering Conference, 2015-January, 706 - 712

  [Refereed]

  International conference proceedings


• 白浜沿岸海域におけるWRF及びMANALによる推定風速場の精度検証

  見崎豪之, 大澤輝夫, 香西克俊, 馬場康之, 川口浩二

  Lead, 2014, 風工学シンポジウム論文集, 23rd

  [Refereed]

• スキャニングライダーの観測設定に関する感度実験

  見﨑豪之, 大澤輝夫, 小長谷瑞木, 嶋田進

  Lead, Dec. 2023, 風力エネルギー利用シンポジウム, 45


• Investigation of Hub-Height Wind Estimation Methods in the Open Ocean (part 1)-Verification of WRF-simulated Vertical Wind Profiles-

  赤井玲那, 大澤輝夫, 上林将輝, 小長谷瑞木, 小長谷瑞木, 見崎豪之, 見崎豪之, 濱田康平, 竹山優子

  2023, 風力エネルギー利用シンポジウム(CD-ROM), 45th


• Comparison of Accuracy of Estimating Offshore Wind Conditions in the Offshore Direction from Coast using Multiple Numerical Models.

  小長谷瑞木, 小長谷瑞木, 大澤輝夫, 糸島裕樹, 上林将輝, 見崎豪之, 見崎豪之, 新宅江莉佳, 荒木龍蔵, 濱田康平

  2023, 風力エネルギー利用シンポジウム(CD-ROM), 45th


• 風況調査に用いるメソ気象モデルWRFの活用事例—特集 気象海象把握技術・ソフトウェアとサービス

  見﨑 豪之, 中里 廉, 小長谷 瑞木

  Lead, 日本風力エネルギー学会, 2023, 風力エネルギー : 日本風力エネルギー学会誌 = Wind energy : journal of JWEA, 47(3) (3), 459 - 464, Japanese


• Characteristics of Vertical Lidar Observations in Coastal Sites.

  藤本冬馬, 大澤輝夫, 小長谷瑞木, 小長谷瑞木, 見崎豪之, 見崎豪之, 浜田康平

  2022, 風力エネルギー利用シンポジウム(CD-ROM), 44th


• 我が国の国家採択風力関連プロジェクトの紹介 洋上風況調査手法の確立に関する研究開発

  嶋田進, 小垣哲也, 加藤秀樹, 濱田康平, 大内麻衣, 高祖研一, 荒木龍蔵, 上田裕洋, 圓尾太朗, 大畑静佳, 岩下智也, 金子航, 日置史紀, 植田祐子, 今村博, 麻生裕司, 見崎豪之, 内山将吾, 小長谷瑞木, 水戸俊成, 大澤輝夫

  一般社団法人 日本風力エネルギー学会, 2022, 風力エネルギー, 45(4) (4), 558 - 562, Japanese


• The Mutsu-Ogawara Scanning LiDAR experiment: Part 2: Dual scanning LiDAR system validation

  SHIMADA Susumu, KOGAKI Tetsuya, KONAGAYA Mizuki, MITO Toshinari, MISAKI Takeshi, ARAKI Ryuzo, UEDA Yuko, OHSAWA Teruo

  Japan Wind Energy Association, 2021, 風力エネルギー利用シンポジウム, 43, 112 - 115, Japanese


• The Mutsu-Ogawara Scanning LiDAR experiment: Part 3: Single scanning LiDAR system validation

  SHIMADA Susumu, KOGAKI Tetsuya, KONAGAYA Mizuki, MITO Toshinari, MISAKI Takeshi, ARAKI Ryuzo, UEDA Yuko, OHSAWA Teruo

  Japan Wind Energy Association, 2021, Proceedings of Japan Wind Energy Symposium, 43, 116 - 119, Japanese


• Accuracy validation of air density simulated by mesoscale model

  見崎豪之, 内山将吾, 大澤輝夫

  Lead, 2021, 風力エネルギー利用シンポジウム, 43


• Validation of Floating LiDARs at the Mutsu Ogawara Observation Site

  UCHIYAMA Shogo, OHSAWA Teruo, ASO Hiroshi, KONAGAYA Mizuki, MISAKI Takeshi, ARAKI Ryuzo, HAMADA Kohei

  Japan Wind Energy Association, 2021, 風力エネルギー利用シンポジウム, 43, 124 - 127, Japanese


• A case study on the accuracy of vertical doppler LiDAR in complex terrain (Averaging and correction Methods)

  水戸俊成, 内山将吾, 見崎豪之, 小長谷瑞木, 伊藤匠平

  2021, 風力エネルギー利用シンポジウム, 43


• Wind resource assessment over Japan for airborne wind turbine using MSM-GPV

  林 煜為, 大澤 輝夫, 見崎 豪之

  Japan Wind Energy Association, 2020, Wind Energy, 44(2) (2), 190 - 193, Japanese


• A STUDY ON HOW TO ESTIMATE OFFSHORE WIND CONDITION USING ONSHORE OBSERVATION DATA AND NUMERICAL SIMULATION

  Konagaya Mizuki, Ohsawa Teruo, Mito Toshinari, Kato Hideki, Misaki Takeshi

  Together with LiDAR observation data at an onshore site, a CFD model and a Meso-scale model are used to estimate wind condition at an offshore site, approximately 2 km away from the onshore site. The LiDAR observation shows that the wind conditions in the study area are greatly affected by thermodynamic phenomenon such as land and sea breezes as well as by dynamical effects from neighboring onshore topography. It is found that since the CFD model cannot take into account such thermodynamical effects, it can have larger estimation errors than the Meso-scale model. A proper choice of the height the LiDAR data of which is used as input into CFD model seems to be a key to the success of the estimation.

  Japan Council for Renewable Energy, 2018, Grand Renewable Energy proceedings, 1, 188 - 188, English


• OFFSHORE WIND RESOURCE ASSESSMENT ON THE WEST COAST OF AWAJI ISLAND (COMPARISON BETWEEN IN-SITU AND WRF-SIMULATED WIND SPEEDS)

  Uchiyama Shogo, Ohsawa Teruo, Misaki Takeshi, Araki Ryuzo, Ueda Hiromi, Azechi Keita, Komatinovic Nemanja

  This study investigates the performance of offshore wind simulation with the Weather Research and Forecasting model (WRF), using in-situ measurements from an onshore met mast and Galion scanning Lidars. A comparison with observations shows that the accuracy of WRF-simulated wind speed depends on the distance from coast and wind direction. It is also found that WRF underestimates a horizontal wind speed gradient in the shore-normal direction. This fact indicates that there is a risk that offshore wind resource can be underestimated, when it is estimated by using the WRF-simulated horizontal wind speed gradient together with the onshore met mast measurements.

  Japan Council for Renewable Energy, 2018, Grand Renewable Energy proceedings, 1, 174 - 174, English


• INVESTIGATION OF WRF SIMULATED HORIZONTAL WIND SPEED GRADIENT USING SCANNING LIDAR MEASUREMENT

  Misaki Takeshi, Ohsawa Teruo, Konagaya Mizuki, Kato Hideki, Mito Toshinari, Eguchi Shinya

  For offshore wind resource assessment in nearshore waters with mesoscale model downscaling, it is important to evaluate the model-simulated horizontal wind speed gradient at a wind turbine hub height. This study investigates the accuracy of horizontal wind speed gradient simulated by the Weather Research and Forecasting model (WRF) using the observation from dual scanning lidar measurements on the coast of Kamisu in Japan. The accuracy validation shows that WRF underestimates horizontal wind speed gradient during the target period. In term of wind direction, the underestimation is more frequently found when wind blows from land sectors. It is moreover found that this underestimation cannot be improved by only changing the planetary boundary layer schemes in the WRF simulation.

  Lead, Japan Council for Renewable Energy, 2018, Grand Renewable Energy proceedings, 1, 184 - 184, English


• WRF計算用海面水温データセットMOSSTとIHSSTの比較

  清水悠正, 大澤輝夫, 見崎豪之, 内山将吾, 香西克俊, 嶋田進

  2018, 日本気象学会大会講演予稿集, (113) (113)


• How can we estimate offshore wind using numerical simulation with onshore observation wind data?

  小長谷 瑞木, 大澤 輝夫, 水戸 俊成, 加藤 秀樹, 見﨑 豪之

  Japan Wind Energy Association, 2017, Proceedings of Japan Wind Energy Symposium, 39, 261 - 264, Japanese


• 沿岸域海上風況実測データを用いたWRF計算風速のバイアス特性の検討

  上出広和, 大澤輝夫, 加藤茉里, 見崎豪之

  2016, 日本気象学会関西支部例会講演要旨集(Web), (141) (141)


• メソ気象モデルWRFを用いた2種類の海上風推定手法の精度検証

  石上一輝, 大澤輝夫, 見崎豪之, 馬場康之, 川口浩二

  2014, 風力エネルギー利用シンポジウム, 36th


• 沿岸海域におけるWRF水平風速勾配の計算精度

  見崎豪之, 大澤輝夫, 竹山優子, 香西克俊, 馬場康之, 川口浩二

  Lead, 2013, 風力エネルギー利用シンポジウム, 35th

• 洋上風力開発のためのメソ気象モデルによる風況シミュレーションの高精度化

  見﨑豪之

  海洋波および大気海洋相互作用に関するワークショップ, Mar. 2024

• 日本風工学会

  2021 - Present


• 日本風力エネルギー学会

  2021 - Present