A high‐efficiency global model of optimization design of impervious surfaces for alleviating urban waterlogging in urban renewal

Abstract

The rapid expansion and unreasonable design of impervious surfaces caused by urbanization have seriously aggravated urban waterlogging. Determining how to optimize the spatial layout of impervious surfaces is the focus of urban waterlogging prevention in urban renewal. The existing urban‐renewal methods include constructing low‐impact development measures by reducing the area of impervious surfaces or implementing a local high‐strength design based on the ant colony algorithm (ACA) from the viewpoint of optimization design. However, these methods have obvious shortcomings in terms of time efficiency, and their optimized design schemes are insufficient at considering the global impervious surface design. Therefore, to address these problems, the study proposes a coupled model of multivariate linear programming and Soil Conservation Service curve number. The model is employed in the central city of Guangzhou, China. The results show, first, that the optimal design of impervious surfaces in urban renewal is to construct a discontinuous connection of high‐low‐high‐density impervious surfaces; second, that, compared with ACA, our method has higher robustness, increases the average optimization rate by 4.48 to 14.00%, and reduces the optimization time over 30 days to 20.8 s; and third, that the optimal results realize the global low‐strength transformation as complements of the existing design scheme of local high‐strength transformation. This study optimizes methods for alleviating urban waterlogging urban renewal at different scales or intensities.

Spatial-temporal evolution of influencing mechanism of urban flooding in the Guangdong Hong Kong Macao greater bay area, China

“…Since the 1980s, the urbanization process has been accelerated with the deepening of reform and opening up (Meng et al, 2020;Liang et al, 2021). The rapid spread of urban built-up areas has caused a significant reduction of rainwater infiltration area (Yu et al, 2021), coupled with the fact that the construction of urban flood control and drainage projects often lags behind the urbanization process (Fang et al, 2021), resulting in the aging of drainage networks and mixed flow of rainwater and sewage (Zhang Q. et al, 2020;Kong et al, 2021). The early planning of the carrying capacity of the pipe network is no longer applicable in a relatively short period (Chan et al, 2021a).…”