Optimized water surface ratio and pervious surface proportion in urbanized riverside areas |
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| Authors: | Cheng Gao Jun Liu Han Cui Zhuowen Wang Shuang He |
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| Institution: | 1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China
2. College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
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| Abstract: | An optimal group of water surface ratios and pervious surface proportions can reduce the risk of waterlogging in large urbanized riverside areas. In this study, the Storage Capacity Curve Method is proposed to calculate the drainage modulus, the essence of which is based on the assumption that the drainage area is a reservoir; and then draw the storage capacity curve after unsteady flow calculation. A series of drainage modulus is calculated with varying water surface ratio and pervious proportion using the Storage Capacity Curve Method. This is done in order to determine the quantitative relationship among these variables through regression analysis. The results indicate that the drainage modulus of a large urbanized riverside area has a good exponential function relative to the water surface ratio and has a linear relationship with the pervious surface proportion. By using an integrated impacts model and a cost function, the optimal group values of the water surface ratio (6.65 %) and the pervious surface proportion (26.4 %) are obtained by minimizing the cost function. |
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