THE IMPACT OF CLIMATE CHANGE AND URBANIZATION ON FLOOD CONTROL CAPACITY OF SPONGE CITY
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- LI Haichao
- Interdisciplinary Centre for River Basin Environment, University of Yamanashi
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- ISHIDAIRA Hiroshi
- Interdisciplinary Centre for River Basin Environment, University of Yamanashi
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- SOUMA Kazuyoshi
- Interdisciplinary Centre for River Basin Environment, University of Yamanashi
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- MAGOME Jun
- Interdisciplinary Centre for River Basin Environment, University of Yamanashi
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Description
<p> In recent years, urban floods have become a more serious problem in China. To reduce flood damage in urban areas, the Chinese government decided to build sponge cities. Assessment of the flood control capacity of sponge cities is important, although several studies have already shown that they can effective control floods. However, the responsiveness of sponge cities to future climate change and increased urbanization has not yet been well-studied. Therefore, we explored the impact of climate change and urbanization on the flood peaks and volumes of sponge cities. Future precipitation projections were obtained from three bias-corrected general circulation models (GCMs) of Coupled Model Intercomparison Project 5 (CMIP5), to derive two representative concentration pathways (RCPs 4.5 and 8.5) for projecting precipitation in the periods 2040–2059 and 2080–2099. The historical expansion of the urban area was quantified using high-resolution land use data from GLOBELAND 30; data on the planned land use changes up to 2035 were obtained from the local authority. We also evaluated the effects of 100% urbanization. A storm water management model (SWMM) was used to quantify the peak water flow and volume reduction rates in a sponge city subjected to changes in the climate and extent of urbanization. We found that the effect of climate change in terms of the ability of the city to reduce flood peaks ranged from 26.2-30.8%, and that the effects of urbanization under extreme precipitation varied by 23.6-30.3%. The flood mitigation capacity is 28.9-31.1%, and the effect of urbanization 29.4-30.8%. Though both of urbanization and climate change will affect flood control capacity, sponge city construction would effectively work for reduction of flood peak and volume under future climate and urbanization in the target area.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 77 (5), I_17-I_25, 2021
Japan Society of Civil Engineers