论文部分内容阅读
天然河道中许多都是具有主槽和滩地的复式河槽,水流漫滩以后,复式河槽的水流结构发生复杂的变化。而天然河道漫滩上常常生长着各种植物,水中植被的存在增加了河床的阻力,如何确定流速分布和流量十分重要。本文基于植被作用下水流阻力的等效平衡原理,提出刚性植被等效附加阻力系数以及植被等效综合阻力系数的计算方法。通过运用SKM方法计算植被作用下的复式河槽垂线平均流速的横向分布,结果表明,本文提出的植被等效综合阻力系数的计算方法是可行的,能较好地确定植被作用下的复式河道垂线平均流速的横向分布。
Many of the natural rivers are double channel basins with a main channel and a beach. After the floodplain floats, the complex structure of the water flow in the compound channel changes in a complicated way. The natural river floodplain often grow a variety of plants, the presence of water in the riverbed increases the resistance, how to determine the flow velocity distribution and flow is very important. Based on the principle of equivalent balance of water flow resistance under vegetation effect, this paper presents the calculation method of equivalent additional resistance coefficient of rigid vegetation and the equivalent comprehensive resistance coefficient of vegetation. By using SKM method to calculate the horizontal distribution of the mean velocities of the vertical multistage channel under the action of vegetation, the results show that the method proposed in this paper is feasible to calculate the equivalent comprehensive resistance coefficient of vegetation, which can well determine the effect of vegetation Horizontal distribution of average line velocity.