山区型河道一维水力数值模拟糙率确定方法

糙率参数取值是河道水流一维数值模拟的关键技术。山区型河道因河势变化急剧而产生的局部阻力对水流流态影响较大。根据山区型河道的水力特性，提出了综合反映子河段内河底切力及局部阻力的综合糙率的确定方法，并通过算例对该方法进行了测试，取得了预期的效果。该方法使得水流一维数值模拟时的计算子河段划分趋于方便，同时对于缺少历史观测资料的河道糙率参数的确定，提供了一种新的方法。

Roughness Calculation Method for 1-d Numerical Simulation of Hydrodynamics in Mountainous River

Estimation of roughness parameter is a key to one dimensional hydrodynamics numerical simulation.For a mountainous river,because of the great variation of river morphology along flow route,the local energy loss has a great impact on hydrodynamics.According to the hydraulic feature of mountainous rivers,this paper proposes a method to estimate a synthetic roughness that gives a good expression of friction loss and local resistance in the sub-segment.To examine the proposed method,a simulation case on open channel is used and a good result is obtained.The proposed method simplifies the sub-segment demarcation and normalizes the estimation of roughness parameter.