Abstract
The urban agglomeration polders type of flood control pattern is a general flood control pattern in the eastern plain area and some of the secondary river basins in China. A HEC-HMS model of Qinhuai River basin based on the flood control pattern was established for simulating basin runoff, examining the impact of urban agglomeration polders on flood events, and estimating the effects of urbanization on hydrological processes of the urban agglomeration polders in Qinhuai River basin. The results indicate that the urban agglomeration polders could increase the peak flow and flood volume. The smaller the scale of the flood, the more significant the influence of the polder was to the flood volume. The distribution of the city circle polder has no obvious impact on the flood volume, but has effect on the peak flow. The closer the polder is to basin output, the smaller the influence it has on peak flows. As the level of urbanization gradually improving of city circle polder, flood volumes and peak flows gradually increase compared to those with the current level of urbanization (the impervious rate was 20%). The potential change in flood volume and peak flow with increasing impervious rate shows a linear relationship.
Highlights
With the accelerated process of urbanization, urban flood control is developing from flood control of a single urban area to that of urban agglomerations
Among the flood controls of urban agglomerations, the single urban model plays its own role in constructing the urban flood control circle, which is known as polder type flood control pattern, and is an extensively used pattern at present
It can be seen that the computed flood hydrographs agree well with the observed hydrographs. These results indicate that the HEC-HMS model was suitable for flood simulation in Qinhuai River basin
Summary
With the accelerated process of urbanization, urban flood control is developing from flood control of a single urban area to that of urban agglomerations. The urban agglomeration polders type of flood control pattern is prevalent in plain river network regions and some of the moderatesized basins in the eastern part of China, such as Suzhou, Wuxi, Changzhou and Jiaxing in the Yangtze River Delta plain and Nanjing, Jurong and Gaochun in the Qinhuai. Research on the polders type of flood control model under the background of urbanization is still in the qualitative analysis phase, which is not thorough and systemic enough
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