滑坡涌浪传播及翻坝过程数值模拟

将滑坡体概化为滑块,并给定其水下运动规律,利用UDF自定义函数对Fluent进行二次开发,模拟了滑块入水产生的涌浪性质,并分析了涌浪首浪传播及翻坝过程。仿真结果表明:若将滑坡概化为滑块,在给定水下运动形式下,产生的涌浪性质与孤立波类似,即涌浪只影响水面以下一定范围,对水底影响不大;涌浪顺水流方向的运动对动压起主要贡献;首浪在传播过程中涌浪波幅会减小而波宽会增大,且波高沿着传播方向其衰减速率在逐渐变小;滑块排挤的库区水体体积小于自身体积;小体积的滑坡对大库容的水库影响程度很小。对比分析不同体积滑坡激发涌浪翻坝的过程发现,滑块体积越大,激发的涌浪传播速度越快,高度越高,形成的翻坝流量越大,对下游的危害性越大。

Numerical simulation of surge propagation and overtopping caused by landslide

A landslide was generalized as a sliding block and the underwater moving law was assumed , and User Defined Function was used to simulate the surge characteristics in the process of block sliding into water by secondary development of Flu -ent software , and the surge propagating and overtopping process was analyzed .The simulation result shows that when the under-water motion form is given , the landslide surge is similar to solitary wave , which can affect a limited range under water and the impact to water bottom could be ignored;the surge movement in flow direction is a main contribution to dynamic pressure; the height of first surge would decrease and the width would increase in propagation , and the decreasing rate of surge height becomes small along the propagation direction;the water volume pushed out by sliding block is larger than block volume .Different surge overtopping processes show that the larger block can generate higher and faster surge , which is more dangerous to the lower reach.