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随着城市化的不断推进,城市洪水、内涝问题日益严重。国内外广泛使用的SWMM模型在防洪排涝的实践中发挥着重要作用,模型参数的确定是其应用可靠的关键性问题。本文利用Morris筛选法,以龙岩市中心城区为例,研究SWMM模型的不同水文水力参数对区域洪峰流量和径流系数的影响程度。研究结果表明,对径流系数影响最大的参数是不渗透性、最小渗入速率和漫流宽度,对洪峰流量影响最大的参数是不渗透性、漫流宽度和渗透性粗糙系数。文中结果有利于提高模型参数选取的效率,也能提高模拟结果的准确度,为今后SWMM模型的应用研究提供参考。
With the continuous promotion of urbanization, urban floods and waterlogging have become increasingly serious. The SWMM model widely used at home and abroad plays an important role in the practice of flood control and drainage, and the determination of the model parameters is the key issue of its reliable application. In this paper, taking Morris screening method as an example, the influence of different hydrological and hydraulic parameters of SWMM model on regional peak flow and runoff coefficient is studied. The results show that the most influential parameters on runoff coefficient are impermeability, minimum infiltration rate and runoff width. The most influential parameters on flood peak flow are impermeability, runoff width and permeability coefficient. The results in this paper are helpful to improve the efficiency of model parameter selection and also improve the accuracy of the simulation results, and provide reference for the application of SWMM model in the future.