任意曲面を有する流路の流れと地形変化予測に関する高度計算技術の開発

开发预测任意曲面河道流量和地形变化的先进计算技术

• 批准号: 21K04272
• 负责人: 音田 慎一郎
• 金额: $ 2.75万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K04272/
• 关键词: 数値モデル; 越流; 地形変化; 一般座標系

近年，豪雨災害が激甚化する中で，洪水流が河床や河岸を構成する多量の土砂を侵食し，河川の流路が大きく変動する現象が確認されている．これまでの河川洪水流，河床・河道変動解析では，実用性の観点から平面的な水の流れ場を解く巨視的なモデルが汎用されてきたが，災害リスクが高くなってきている中で，流路変動現象について精度の高い予測を行うためには，氾濫流の非定常的な挙動と，地形変化をもたらす河岸，河床近傍の流れと土砂輸送特性を取り扱うことのできるモデルの構築が必要である．その際，実際の河川では曲線形状を有していることから河道に沿った一般座標系を用いることが有用であると考えられる．そこで本研究では，申請者が開発してきた表面流と浸透流を同時に予測できるデカルト座標系での３次元流体解析モデル，土砂輸送モデルを河道に沿った一般座標系に拡張し，水際・河床近傍の複雑な流れの３次元性と土砂輸送特性を考慮することで，曲線形状を有する流路の流れと地形変化を予測できる新たな計算力学的アプローチを構築する．本年度は，一般座標系に拡張した表面流と浸透流を同時に予測できる３次元流体解析モデルを用いて，湾曲水路の側壁に堰を設置した場合の横越流現象に関する数値解析を行い，堰の高さに伴う３次元的な流れ構造の違いについて考察した．また，土砂輸送モデルを一般座標系に拡張し，上記の流れのモデルと組み合わせ，基本的な河床変動計算への適用について検討を行った．

In recent years, torrential rains have intensified the flood season, the flood flow has caused large amounts of soil and sand to invade the river bank, and the river flow path has caused serious damage to the river. in recent years, torrential rains have intensified the damage caused by torrential rains, causing heavy rains in the riverbed and river banks, causing large amounts of soil and sand in the river bed and banks. In the middle of the sea, the flow path is more accurate, the flow is more accurate, the flow is unsteady, the topography is not steady, the river bank is affected, and the riverbed is close to the river bank. In the shape of the curve of the international river, there is an analysis of the three-dimensional fluid flow along the general waterway. In this study, the applicant opened the surface flow to soak the flow, and at the same time, the standard was used to analyze the three-dimensional fluid, and the soil sand transport was carried out along the general channel. The characteristics of three-dimensional soil and sand transport near the water international riverbed are studied in terms of the characteristics of three-dimensional soil and sand transport, and the shape of the curve is affected by the flow path and the topography of the flow. This year, the general standard is that the surface flow is permeated and the three-dimensional fluid analytical method is also used. The wall barrier of Wanqu waterway is installed, and the cross flow is analyzed, the height of the Weir is accompanied by a three-dimensional flow, and the soil and sand is transported to the wall of the waterway. the standard of the general block is closed, the upper flow is integrated, and the basic calculation of riverbed movement is based on the analysis of the temperature.

项目成果

3D NUMERICAL SIMULATION OF LATERAL OVERTOPPING FLOWS IN CURVED CHANNEL USING BOUNDARY FITTED COORDINATE SYSTEM

基于边界拟合坐标系的弯曲渠道横向溢流3D数值模拟

• DOI: 10.2208/journalofjsce.22-15049
• 发表时间: 2023
• 期刊: Journal of JSCE
• 作者: 浜田光太郎;山崎大;新田友子;Jian Chen;五十里 洋行，後藤仁志，脇嶋可成;Qiyun Pang and Shinichiro Onda
• 通讯作者: Qiyun Pang and Shinichiro Onda

Development of Numerical Model in Boundary Fitted Coordinate System and Application to the Lateral Overtopping Flows

边界拟合坐标系数值模型的建立及其在横向溢流中的应用

• 发表时间: 2022
• 作者: 足立幸太;山崎大;新田友子;Chen Jian;Qiyun Pang and Shinichiro Onda
• 通讯作者: Qiyun Pang and Shinichiro Onda

3D Numerical Simulation of the Lateral Overtopping Flows Using Boundary Fitted Coordinate System

使用边界拟合坐标系的横向溢流3D数值模拟

• 发表时间: 2021
• 作者: 足立幸太;山崎大;新田友子;Chen Jian;Qiyun Pang and Shinichiro Onda;Hiroyuki Ikari and Hitoshi Gotoh;Matuttis Hans-Georg;鹿島千尋，中谷祐介，山根成陽，戸村祐希;Qiyun PANG and Shinichiro ONDA
• 通讯作者: Qiyun PANG and Shinichiro ONDA