Erosion Process of High River Bank Exposed to Large Water Level Changes

水位大变化下高河岸的侵蚀过程

• 批准号: 06452416
• 负责人: FUJITA Yuichiro
• 金额: $ 3.58万
• 依托单位: GIFU UNIVERSITY (1995)Kyoto University (1994)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452416/
• 关键词: river bank erosion; large rivers; river bed variations; river bank stability; seepage in river bank; river bed scour; 数値解析; 水理実験

In order to clarify actual state of high bank erosion, image analyzes of satellite imageries has been continued and compared with ground truths in Bangladesh, where large rivers cause severe bank erosion during flood.Numerical simulations have been carried out on flood flows in the Meghna River, Bangladesh to predict bank erosion process. Results of these simulation show good agreement to field observations. Hence'river bed variations have been simulated by using this flow model with bed load and suspended load. Calculated bed variation indicated possibility of enormous bed scouring.Instability of river bank slope was analyzed by a simplified Janbu method. Behavior of unstable bank fraction was predicted by a equation of motion extending the Janbu method.An experiment was carried out on air-water behavior inside of river bank, which affects stability of river bank slope, corresponding to river water level changes. Air flow rate from the bank surface, top and slope, was measured.

为了弄清高河岸侵蚀的实际情况，我们继续对孟加拉国的卫星图像进行图像分析，并将其与地面事实进行比较，孟加拉国的大河在洪水期间造成严重的河岸侵蚀。对孟加拉国梅克纳河的洪水流量进行了数值模拟，以预测河岸侵蚀过程。模拟结果与现场观测结果吻合较好。因此，用该模型模拟了含河床荷载和悬移荷载的河床变化。计算出的河床变化表明有可能发生巨大的河床冲刷。采用简化Janbu法对河岸边坡失稳进行了分析。用推广Janbu方法的运动方程预测了不稳定岸段的行为。对河流水位变化对河岸边坡稳定性的影响进行了试验研究。测量了河岸表面、顶部和斜坡的气流速率。

项目成果

長田信寿・細田 尚・村本嘉雄・M.Rahman: "移動一般座標系による側岸侵食を伴う河道変動の数値解析" 水工学論文集. 40. (1995)

Nobuhisa Nagata、Hisashi Hosoda、Yoshio Muramoto 和 M.Rahman：“使用移动通用坐标系对伴随边岸侵蚀的河道波动进行数值分析”水利工程学报 40。（1995 年）

下島栄一・上田裕一郎,吉岡龍馬他: "亀裂堆積岩の山体での雨水浸透とその水質" 水工学論文集. 39. (1995)

Eiichi Shimojima、Yuichiro Ueda、Ryoma Yoshioka 等：“裂隙沉积岩山体的雨水渗透及其水质”水利工程学报 39。（1995）。

細田 尚・長田信寿・村本嘉雄: "移動一般座標系による開水路非定常流の数値解析" 土木学会論文集II. 34. 267-272 (1996)

Takashi Hosoda、Nobuhisa Nagata 和 Yoshio Muramoto：“使用移动通用坐标系对明渠中的非定常流进行数值分析”日本土木工程师学会会议记录 II 34. 267-272 (1996)。

細田 尚・長田 信寿・村本 嘉雄: "移動一般座標系による開水路非定常流の数値解析" 土木学会論文集II. 34. 267-272 (1996)

Hisashi Hosoda、Nobuhisa Nagata 和 Yoshio Muramoto：“使用移动通用坐标系对明渠中的非定常流进行数值分析”日本土木工程师学会论文集 II 34. 267-272 (1996)。

N.Nagata, T.Hosoda, Y.Muramoto and M.M.Rahman: "Numerical Analysis of Channel Processes with Bank Erosion by Moving boundary Fitted Co-ordinate System" J.of Hydraulic Eng., JSCE. Vol.40. (1995)

N.Nagata、T.Hosoda、Y.Muramoto 和 M.M.Rahman：“通过移动边界拟合坐标系对河道侵蚀过程进行数值分析”J.ofHydraulic Eng.，JSCE。