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该文结合实例河道运用环境流体力学代码(EFDC)模型研究滩地植被对河道水流的影响。模型通过建立植被阻力的经验公式,求解准三维水动力学方程,得到河道水流的水动力特征。通过模拟6组不同密度和高度的植被,并对流速和水位进行对比分析,结果表明:有植被存在时滩地水流显著减小。当植被密度600株/m2、高度为20cm时,滩地流速约为0.2m/s,此时河道水位相比无植被抬高0.2m左右;当植被高于1.0m时河道水位增加0.45m左右。研究结果对河道防洪和生态修复管理等有借鉴作用。
In this paper, the effect of beach and beach vegetation on the river flow is studied by using the model of environmental fluid mechanics code (EFDC). Through establishing the empirical formula of vegetation resistance, the model solves the quasi-three-dimensional hydrodynamic equation and obtains the hydrodynamic characteristics of river flow. By simulating 6 groups of vegetation with different densities and altitudes, and comparing the flow velocity with the water level, the results show that the water flow of the beachland is significantly reduced when there is vegetation. When vegetation density is 600 plants / m2 and height is 20cm, the flow rate of the beach is about 0.2m / s. At this time, the water level of the river is about 0.2m higher than that of no vegetation. When the vegetation is higher than 1.0m, the water level of the river increases about 0.45m. The results of the study can be used as reference for river flood control and ecological restoration management.