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Volume 18, issue 9 | Copyright
Nat. Hazards Earth Syst. Sci., 18, 2525-2536, 2018
https://doi.org/10.5194/nhess-18-2525-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Sep 2018

Research article | 20 Sep 2018

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 Song3,4 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
  • 4Shenzhen Institute of Research and Innovation, The University of Hong Kong, Shenzhen, China

Abstract. The increase in impervious surfaces associated with rapid urbanization is one of the main causes of urban inundation. Low-impact development (LID) practices have been studied for mitigation of urban inundation. This study used a hydrodynamic inundation model, coupling SWMM (Storm Water Management Model) and IFMS-Urban (Integrated Flood Modelling System–Urban), to assess the effectiveness of LID under different scenarios and at different hazard levels. The results showed that LID practices can effectively reduce urban inundation. The maximum inundation depth was reduced by 3%–29%, average inundation areas were reduced by 7%–55%, and average inundation time was reduced by 0%–43% under the eight scenarios. The effectiveness of LID practices differed for the three hazard levels, with better mitigation of urban inundation at a low hazard level than at a high hazard level. Permeable pavement (PP) mitigated urban inundation better than green roofs (GRs) under the different scenarios and at different hazard levels. We found that more implementation area with LID was not necessarily more efficient, and the scenario of 10%PP + 10%GR was more efficient for the study area than other scenarios. The results of this study can be used by local governments to provide suggestions for urban inundation control, disaster reduction, and urban renewal.

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Our study builds a 2-D model at an urbanized watershed, and the results indicate that permeable pavement and green roofs are good strategies for urban inundation mitigation. What is more, we also find the best combination of permeable pavement and green roofs for local areas, considering both effectiveness and cost. This study enriches the inundation mitigation research on an urban watershed scale and provides some references to urban storm water management and inundation mitigation.
Our study builds a 2-D model at an urbanized watershed, and the results indicate that permeable...
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