Effectiveness assessment of urban drainage and flood control systems based on DPSIR-AHP-FCE model

Abstract

[Objective] Urban flooding disasters are becoming increasingly severe, which drives the upgrading of urban drainage and flood control systems. To assess urban disaster prevention and mitigation capacity, it is necessary to conduct a systematic assessment of the effectiveness of urban drainage and flood control systems. [Methods] An integrated assessment method coupling social, natural, and infrastructure dimensions was developed based on the Driver-Pressure-State-Impact-Response(DPSIR) framework. By jointly analyzing external environmental constraints and internal conditions of urban drainage and flood control systems, a framework for constructing effectiveness assessment indicators was established. The Analytic Hierarchy Process-Fuzzy Comprehensive Evaluation(AHP-FCE) method was employed to quantify indicator weights and membership degrees, and integrated with a coupling coordination degree model to assess effectiveness levels. Using the central urban area of Jiujiang City as a case study, the effectiveness of urban drainage and flood control systems in 2017 and 2021 was compared and analyzed. [Results] The result showed that with the completion of the first-phase urban water-related projects, the coupling coordination degree of the five DPSIR dimensions in the central urban area of Jiujiang City increased from 0.771 to 0.901, achieving high coordination and enhancing system effectiveness. Key indicators including compliance rates of drainage pumps and gates, levees, and urban stormwater drainage increased by 0.45, 0.50, and 0.42 points respectively, significantly improving deficiencies in the state and impact dimensions. However, the construction of the drainage pipe network was relatively underdeveloped, and the impervious surface ratio showed an increasing trend, which would be a key focus for future management. [Conclusion] This framework helps identify weaknesses in urban drainage and flood control systems and provides guidance for planning and implementing urban stormwater management strategies.

Keywords

urban flooding / urban drainage and flood control systems / effectiveness assessment / indicator framework / DPSIR framework / analytic hierarchy process fuzzy comprehensive evaluation method / climate change