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为了研究生态河道中的植被对河道水流产生的阻力问题,分析了糙率与平均流速、水深、植被密度之间的关系,总结出柔性淹没植被情况下的糙率公式,并通过数值计算求解一维圣维南方程,从流量、水位、流速三个方面来分析柔性植被对洪水波传播的影响.研究结果表明:植被的存在虽然会增大河床糙率,但当水位和流速增大时,植被对糙率的影响会降低;从糙率对洪水波影响来看,若糙率越大,则流量、流速越小,水位越高.
In order to study the resistance of the vegetation in the ecological channel to the river water flow, the relationship between the roughness and the average flow velocity, water depth and vegetation density was analyzed, and the roughness formula under the condition of the flexible submerged vegetation was summarized. The effect of flexible vegetation on flood wave propagation is analyzed from three aspects of flow, water level and flow velocity.The results show that although the existence of vegetation increases the roughness of riverbed, when the water level and velocity increase, The effect of vegetation on the roughness will be reduced. From the perspective of the influence of roughness on the flood wave, the larger the roughness, the smaller the flow rate and velocity and the higher the water level.