Identification of priority areas for green stormwater infrastructure based on supply and demand evaluation of flood regulation service

Abstract

Under global climate change and rapid urbanization, urban waterlogging has become increasingly severe in the world. Green Stormwater Infrastructure (GSI), which can provide flood regulation service (FRS), is seen as a key measure to help address this challenge in the construction of a sponge city. With less consideration given to social and economic factors, most current methods for the layout of GSI only lay emphasis on the management, control, and mitigation of flooding. As a result, the service provided by GSI cannot reach the people or areas in most need, leading to inefficient utilization of the construction funds. This study provides a new framework for identifying the priority areas of GSI that considers both flood mitigation benefits and socio-economic benefits by introducing the evaluation of FRS supply and demand into GSI planning. In addition, land use measurement and disaster risk assessment were used to quantify and visualize the supply and demand of FRS, respectively. Based on the evaluation results, the priority areas for GSI can be identified. The research results provide a new basis and guidance for the planning and layout of GSI, and optimization of GSI spatial layout at a macro-scale, which also can guide the construction of sponge city. Finally, a case study of Wuhan was conducted to validate the effectiveness of the framework.