Construction and application of sponge city resilience evaluation system: a case study in Xi’an, China

Abstract

Urban vulnerability is evident when highly complex flood risks overlap with diverse cities, and it is important to enhance the resilience of cities to flood shocks. In this study, a sponge city resilience assessment system is established considering engineering, environmental and social indicators, and the grey relational analysis method(GRA) is used to quantify sponge city resilience. At the same time, a multi-objective optimization model is established based on the three dimensions of water ecological environment, drainage safety, and waterlogging safety. The optimal configuration of greygreen infrastructure is weighed by combining the ideal point method, aiming to ensure that cities effectively reduce flood risk through the optimal configuration scheme. Taking the Xiaozhai area in Xi'an as the study area, the evaluation results show that the grey relational degree(GRD)of the resilience indexes of the original scheme is between 0.390-0.661 under the seven different return periods. While the optimization scheme ranges from 0.648-0.765, with the best sponge city resilience at a return period of 2a. Compared with the original scheme, the optimized sponge city resilience level increases from level II to nearly level I under the low return period and from level IV to level II in the high return period, indicating that city's ability to cope with waterlogging and pollution is enhanced significantly. Besides, the main factor affecting the sponge city resilience is the runoff control rate, followed by pollutant load reduction rate, which can provide a 2 methodological framework for the assessment and improvement of sponge city resilience.

Application Research on Optimal Allocation of Drainage Rights Based on Computer Big Data in Anhui Province of Huai-River Basin

“…It contains the overall water quality of individual stations in a certain period and a certain time. The automatic extraction of water quality assessment results is to display the assessment conclusions in Word form, and the assessment conclusions can be displayed in Word form, and it can be directly printed out for easy release and release [12]. The platform display in GIS is to divide the river according to the monitoring station, draw the river course according to the water quality of each river, and use different colors to represent the shape of the river under different water quality, as well as the location of the monitoring station and the water quality of each river in the study area.…”

Precondition Study of a Sponge City: Comprehensive Assessment of the Vulnerability of an Urban Rainwater System

“…The urban rainwater system is a crucial component of sponge city infrastructure, and its stability and reliability are directly related to the sponge city's flood prevention and drainage capabilities. However, there has been a notable absence of theoretical frameworks employed to evaluate plans or designs and assess the vulnerability of existing rainwater systems prior to the commencement of construction work [6].…”

Scenario-Based Green Infrastructure Installations for Building Urban Stormwater Resilience—A Case Study of Fengxi New City, China

“…In this study, we define urban stormwater resilience as the capacity of a city or urban resilient system to withstand and absorb disruptions amid stormwater, adapt while preserving its foundational structure, and achieve recovery and transformation, which needs to take into account the dynamics of stormwater or inundation [36,43,44]. Urban stormwater resilience has gained policy endorsement and widespread application in diverse national management frameworks [36,45]. There is a relative scarcity of analyses concerning urban sub-systems (e.g., green and gray infrastructure systems) during stormwater events and comparisons of resilience enhancements under optimal configuration alternatives [45].…”

“…Urban stormwater resilience has gained policy endorsement and widespread application in diverse national management frameworks [36,45]. There is a relative scarcity of analyses concerning urban sub-systems (e.g., green and gray infrastructure systems) during stormwater events and comparisons of resilience enhancements under optimal configuration alternatives [45]. Hence, the establishment of a comprehensive stormwater resilience evaluation system becomes essential, serving as a metric to gauge urban resilience and aiding planners in comprehending and fortifying urban resilience [46].…”

“…Nevertheless, the existing research also exhibits a lack of uniformity in sponge city stormwater resilience evaluation indicators. Scientifically establishing a resilience evaluation framework for sponge cities becomes a paramount concern, and a well-constructed system is instrumental in translating the resilience theory into effective practice [45].…”