Abstract
Storm Water Management Model (SWMM) is a digital hydrological model which is widely used for the simulation of rainfall-runoff processes in urban catchment. SWMM is a distributed model, which means a study urban catchment needs to be divided into several irregular subcatchments first before simulation. However, most of the existing subcatchments division approaches for the SWMM are not able to capture the characteristics of the spatial variability in topography and hydro information of urban catchment. In this paper, a new subcatchment-division approach for SWMM is proposed. Two existing division method are combined together in this approach by using Geographic Information System (GIS), which can make the subcatchments fully reflect the hydrological features of the urban catchment, thus further improve the simulation results of SWMM. The actual application results show that the SWMM using the subcatchment dividing by the approach in this paper is more reliable than other existing SWMM in urban region.
Highlights
In recent years, due to the serious threats from the storm water disasters to the traffic, commerce, production and lives and properties of citizens, it is very important to establish scientific methods for urban storm water disaster prevention and control [1]
This paper provides a new subcatchments division approach especially for Storm Water Management Model (SWMM)
In this approach, according to the characteristics of rainfall-runoff and overland flow processes of urban region, the roads and conduits is considered as the main flow path of the runoff water, and the subcatchments of SWMM can be constituted by the drainage areas of roads and conduits
Summary
Due to the serious threats from the storm water disasters to the traffic, commerce, production and lives and properties of citizens, it is very important to establish scientific methods for urban storm water disaster prevention and control [1]. In this paper, according to the characteristics of the rainfall-runoff processes in the urban region, the two subcatchments dividing approaches are combined together by using the GIS technology, and a new approach is proposed. In this approach, the effects of surface topography, roads and conduits, junctions and buildings on the rainfall-runoff processes are all reflected in the distribution of subcatchment, which can make the SWMM model more typical and reliable
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