基于分流比的复杂分汊河道滑坡涌浪远场传播计算方法

Calculation method for far-field propagation of landslide surge based on flow diversion ratio of a bifurcated river

基于分汊河道的分流比理论,综合斜条分法和水阻力影响等经典滑速分析方法,提出一种适用于复杂分汊河道的涌浪远场传播计算方法。以雅砻江两河口水电站磨古倾倒滑坡体为例,考虑磨古倾倒滑坡体至两河口水电站坝前河道分汊的实际工况,应用所提出的方法分析两河口库区磨古倾倒滑坡体涌浪产生和传播特征,得到了二期蓄水位2785 m工况下2种典型滑坡滑动模式涌浪的初始浪高、坝前浪高及大坝爬高。结果表明:滑坡沿折断带滑动时滑坡涌浪至大坝浪高为9.32 m;沿强弱倾倒分界面滑动时滑坡涌浪至大坝浪高为14.73 m。

Based on the theory of flow diversion ratio in bifurcated rivers,integrating the classical slice velocity analysis methods such as the inclined slice method and the influence of water resistance,a calculation method for the far-field surge propagation in a bifurcated river was proposed.Taking the Mogu toppling landslide of the Lianghekou hydropower station in the Yalong River as an example,considering the working condition of the Mogu toppling landslide to the bifurcated river in front of the dam of the Lianghekou hydropower station,the generation and propagation characteristics of the toppling landslide surge were analyzed by the proposed method.The initial surge height,dam front surge height and dam climbing height of two typical landslide sliding modes were obtained under the condition of the second phase storage water level of 2785 m.The results show that the surge height of landslide surge is 9.32 m in front of the dam when the landslide slips along the fracture zone.When sliding along the strong and weak toppling interface,the surge height of the landslide surge is 14.73 m in front of the dam.