Comprehensive benefits of different application scales of sponge facilities in urban built areas of northwest China
2021
Han, Ruixiang | Li, Jiake | Li, Yajiao | Xia, Jun | Gao, Xujun
At present, low-impact development (LID) faces with problems such as lack of systematic planning, immature benefit assessment system and unreasonable index system. In order to establish an area allocation optimization evaluation index system, this study selects multiple indicators of the rain garden in terms of environmental, economic and social benefits. Analytic hierarchy process is used to determine the weight of each index. The study takes a built city as an example, and then constructs a regional MIKE URBAN model. The water volume and water quality control effect under different rain garden layout areas in the built area are simulated and studied to provide data for various indicators. According to the 63 years’ rainfall data in the study area, the rainfall of different recurrence periods are designed. The environmental, economic and social benefits under different recurrence periods are calculated through the proposed evaluation system, and then the comprehensive benefits of various schemes are calculated. The results show that when the layout area ratio is 4%–10%, the comprehensive benefit value decreases gradually and so does the reduction rate until a stable interval is reached. The optimal area for the layout of the rain garden in the built city is 4%.
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