Author(s): Qian Yu; Mingyang Wang; Jing Wang; Na Li
Linked Author(s): Jing Wang
Keywords: Low Impact Development Mann-Kendall test climate change multiple benefits pluvial flooding
Abstract: Evaluating the comprehensive benefits of Low Impact Development (LID) measures under varying rainfall characteristics is essential for decision-makers when planning and designing LID practices to effectively adapt to climate change. The Jinan Daminghu Sponge City Construction pilot area is selected as the study area in this study. Using daily precipitation data from the Jinan National Meteorological Station from 1951 to 2021, we first analyse the temporal variations in precipitation and extremes using the Mann-Kendall test and Sen’s slope estimator. Based on this, we set three different rainfall scenarios and analyse the comprehensive benefits of LID measures under these scenarios, including water quantity and quality control, groundwater recharge, and reduced economic losses. The results indicate that while the annual mean precipitation exhibits an insignificant upward trend, there is considerable variability in interannual precipitation. Moreover, extreme precipitation events are projected to become more frequent or intense. The reduction ratios of inundation areas under 5-year, 10-year, and 20-year are 11.02%, 9.32%, and 8.02%, respectively. Correspondingly, the suspended solid (SS) load control rate and direct economic loss reduction rate also decrease. On the contrary, the corresponding groundwater recharge volumes increase. The efficacy of LIDs varies with rainfall return periods, significantly influencing key indicators such as inundation area, direct economic loss, SS load, and groundwater recharge.
Year: 2025