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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2017-402
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Jan 2018

Research article | 04 Jan 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Effectiveness of low impact development for urban inundation risk mitigation under different scenarios: a case study in Shenzhen, China

Jiansheng Wu1,2, Rui Yang1, and Jing Song3 Jiansheng Wu et al.
  • 1Key Laboratory for Urban Habitat Environmental Science and Technology, Shenzhen Graduate School, Peking University, Shenzhen 518055, PR China
  • 2Key Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, PR China
  • 3Department of Urban Planning and Design, The University of Hong Kong, Hong Kong

Abstract. The increase in impervious surfaces associated with rapid urbanization is one of the main causes of urban inundation. In order to eliminate the adverse effects caused by impervious surfaces, many scholars have begun to research the use of low impact development (LID) practices to mitigate urban inundation risk. This study proposes a hydrodynamic inundation model, coupling SWMM (Storm Water Management Model, 1D) and IFMS Urban (Integrated Urban Flood Modelling System, 2D), to simulate inundation depth, area, and time of stormwater inundation on an urban watershed scale, as well as to assess the effectiveness of two LID practices, permeable pavement (PP) and green roof (GR), under 25% GR+25% PP, 50% GR+50% PP, 75% GR+75% PP, 100% GR+100% PP, 100% PP, 100% GR scenarios, and Low, Medium, High hazard levels. The results show the following. 1) LID practices can effectively eliminate inundation risk for most areas under Low hazard level for urban inundation. They can ease the inundation risk for places under higher hazard levels for urban inundation under different scenarios. More specifically, the maximum inundation depth was reduced by 14–29%, inundation areas were reduced by 34–55%, and average inundation time was reduced by 0–43% in six scenarios. 2) In this study, the performance of PP is better than that of GR under different scenarios and hazard levels. 3) The scenario of 100% PP+100% GR has the best effectiveness for inundation reduction, but that of 25% PP+25% GR is more efficient when considering cost-effectiveness. The results of this study can serve as a reference to local governments, and provide suggestions regarding urban inundation control, disaster reduction, urban renewal, and so on.

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Short summary
Our study builds a 2D model at an urbanized watershed and the results indicate that permeable pavement and green roof are good strategies for urban inundation mitigation. What's more, we also find the best combination percentage of permeable pavement and green roof for local area considering both effectiveness and cost. This study enriches the inundation mitigation research on an urban watershed scale and provides some references to urban stormwater management and inundation mitigation.
Our study builds a 2D model at an urbanized watershed and the results indicate that permeable...
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