Abstract
The types of urban mountains are diverse, and the surrounding environment is complex. The conditions of runoff generation and convergence in different regions of the same mountain vary. Using the Lijia Mountain in China’s Nanjing City as a case study, this study investigates the effects of such mountain-region-based LID (Low Impact Development) systems. Based on the hydrological analysis of this mountain region, SWMM (Storm Water Management Model) software is used to model and compare the runoff control effects of two LID systems schemes, namely segmental detention and retention and terminal detention and retention. The study’s findings demonstrate that the terminal detention and retention scheme can effectively delay the time of peak flooding and partly reduce peak discharge. In contrast, the segmental detention and retention scheme has a limited delay effect on flood peaks but significantly reduces the peak discharge. This research breaks through the limitations of the previous construction of a single LID scheme for mountainous regions in built-up urban areas. It serves as a theoretical model and technical reference for selecting LID scenarios in response to different mountain conditions.
Highlights
Extreme weather events are becoming more common and occurring globally due to global warming, especially in China [1]
Low impact development (LID) models were generated via the following three steps: (1) The STORMWATER MANAGEMENT MODEL (SWMM) software was used to generate the research area’s sub-catchment, cut-off ditch, and outfall, and configure essential parameters such as the Manning coefficient, pipe roughness coefficient, infiltration rate, and attenuation coefficient; (2) Rainfall models for different return periods were built according to the Chicago rainstorm method; (3) Model validation was completed through the runoff coefficient
This paper focuses on the control performance of the mountain LID
Summary
Extreme weather events are becoming more common and occurring globally due to global warming, especially in China [1]. Intense storms and torrential rains have been more common in China in recent decades [2], leading to numerous occurrences of severe flooding, which has become another major “urban disease” related to traffic congestion and pollution [3]. In response to a range of rain and flood-related issues associated with its urbanization process, China has actively promoted the construction of a new urban construction model dubbed “sponge cities” [4]. Low impact development (LID) is one of the theoretical foundations for sponge cities [5]. LID is one of China’s most recent and commonly used stormwater management tools, having been previously employed in theoretical research and practical applications in the United States, Germany, New
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
