Research on water-related disaster mitigation and environment symbiosis technology in rural Bangladesh

孟加拉国农村水减灾与环境共生技术研究

• 批准号: 19KK0118
• 负责人: 川池 健司
• 金额: $ 11.56万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-10-07 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19KK0118/
• 关键词: 洪水災害; 河岸侵食; 水制工; バンダル; 水質汚濁; 避難行動; 水防災; 環境共生技術; バングラデシュ; 農村地域

洪水時における流体力の制御と局所洗掘の軽減に着目し，バンダル型水制工の安定性の向上に関する実験的検討を行った．実験結果を踏まえ，バンダル型水制工をはじめ，石積み水制工，石かご水制工，杭出し水制工，聖牛型水制工等自然材料を活かした伝統的水制工周辺の洪水流構造及び乱れ特性の抽出と比較を行った．バンダル型水制工の不透過なシート部による流れの剥離，強い乱れの生成や活発な運動量交換が主な特徴であることが確認された．また，構造物周辺の局所洗掘軽減対策として，杭出しを用いた様々な導流工を提案し，その効果の検証に関する基礎水理実験を行った．特に，導流工の長さと幅が洗掘体積や最大洗掘深に与える影響を明らかにした．導流工の最適化によって，流れが最も効果的に制御され，洗掘防止につながることが期待される．また，湾曲部において複数の水制を設置する際に，最も効果的に侵食を防止するための設置位置や設置間隔を検討するための，OpenFOAMを用いた3次元数値解析モデルの開発を行った．河川堤防の越水破堤に関して，2次元的な氾濫台の上で非粘着性土砂による堤防模型を作成して水理実験を行い，越流が始まってから堤体が下方に侵食され，破堤口が拡幅していく過程を再現した．また，実際の堤防を想定して複数の堤体材料を組み合わせたときの堤体神職の特性についても考察した．その他，メグナ川下流における地下水を考慮した物質輸送解析を行った．

A discussion on the stability of hydraulic systems during flooding is being conducted. As a result, the structure and characteristics of flood flow in the water system cycle of the system are compared with those of natural materials such as stone deposit, stone deposit, water system, water system, etc. The main characteristics of the non-permeable part of the water control system are confirmed by the separation of the flow, the generation of the strong disturbance and the exchange of the active amount. In addition, the basic water management related to the investigation of the results of the study was carried out. In particular, the length and amplitude of the diversion work, the volume of the excavation, the maximum excavation depth and the impact of the excavation work are clearly defined. The optimization of the flow control system, the flow control system to achieve the most effective results, and the cleaning system to prevent the flow control system. When a plurality of water systems are set up, the most effective water system is set up to prevent water intrusion. The dike model of river dike crossing water and breaking dike is established in 2D. The dike model is composed of non-cohesive soil and sand above flood platform. The process of crossing water and breaking dike is reproduced. In addition, the actual design of the embankment is determined by the combination of a plurality of embankment materials and the characteristics of the embankment. Analysis of material transport in groundwater under consideration.

项目成果

Study on the Effect of Super Dikes on Riverbed Deformation in Meandering Channel Employing 3D Numerical Simulation

超级堤对曲流河道河床变形影响的3D数值模拟研究

• 发表时间: 2022
• 作者: Heli YU・Kazuki YAMANOI・Kenji KAWAIKE・Hajime NAKAGAWA

Flood and Substance Transport Analysis with Consideration of Ground Water: Case Study of the Lower Meghna River in Bangladesh

考虑地下水的洪水和物质输送分析：孟加拉国梅格纳河下游案例研究

• 发表时间: 2022
• 作者: Masakazu Hashimoto;Ahmed Ishtiaque;Amin Chowdhury;Shampa;Zhang Hao;Kenji Kawaike;Anisul Haque;Munsur Rahman
• 通讯作者: Munsur Rahman

導流工を有する橋脚周辺の流れと洗掘特性に関する実験的検討

导流工程桥墩周围水流冲刷特性试验研究

• 发表时间: 2022
• 作者: Ohtori Kaira;Ken Komazawa;Roland Schregle;Nozomu Yoshizawa,;濵砂翔，張浩，大本照憲
• 通讯作者: 濵砂翔，張浩，大本照憲

Flood and substance transportation analysis with consideration of groundwater: case study of the lower Meghna River in Bangladesh

考虑地下水的洪水和物质输送分析：孟加拉国梅格纳河下游案例研究

• 发表时间: 2021
• 作者: Masakazu Hashimoto;Ahmed Ishtiaque Amin Chowdhury;Zhang Hao;Kenji Kawaike;Shampa;Anisul Haque and Munsur Rahman
• 通讯作者: Anisul Haque and Munsur Rahman

3D SIMULATION OF FLOW AND LOCAL SCOUR AROUND A SPUR DIKE WITH DIFFERENT LOCATION IN MEANDERING CHANNELS WITH DIFFERENT SINUOSITY

不同蜿蜒度曲流河道不同位置丁坝周围水流及局部冲刷3D模拟

• DOI: 10.2208/jscejhe.78.2_i_1207
• 发表时间: 2022
• 期刊: Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
• 作者: YU Heli;YAMANOI Kazuki;KAWAIKE Kenji
• 通讯作者: KAWAIKE Kenji