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Coastal protection using building with nature concept:A case study from Chongming Dongtan Shoal,China

Acta Oceanologica Sinica 2021年第10期40卷 152-166页

作者： Zhentao Chong Min Zhang Jiahong Wen Luyang Wang Jie Mi Jeremy Bricker Stanley Nmor Zhijun Dai School of Environmental and Geographical Sciences Shanghai Normal UniversityShanghai 200234China State Key Laboratory of Estuarine and Coastal Research(East China Normal University) Shanghai 200241China Department of Hydraulic Engineering Delft University of Technology2628 CN DelftThe Netherlands Department of Civil&Environmental Engineering University of MichiganAnn ArborMI 48109USA Department of Estuarine and Delta Systems Royal Netherlands Institute for Sea Research4400 AC YersekeThe Netherlands

With climate change and rising sea levels,the coastal zone’s flood risk is *** researches have shown a gradually degrading capacity of traditional hard engineering structures(e.g.,seawall,dikes)on flood mitigation due to problems such as land subsidence and insufficient *** remedy the defects,the"building with nature concept"for coastal protection with saltmarshes was examined by combining field measurements and numerical *** advantages of saltmarsh over traditional seawall on flood protection was demonstrated from the perspective of both flood area mitigation and economic gain,based on scenario *** show that tidal wetlands are essential in mitigating significant wave heights(Hs)and current velocities even during storm *** storm wave and current velocity reduction ratio(RRw and RRc)by saltmarshes on Chongming Dongtan Shoal(CMDS)during Typhoon 9711 is approximately 11%and 51%,*** wave and current mitigation by Scirpus mariqueter are more efficient than Spartina alterniflora and Phragmites australis during measurements in 2010,which were approximately 0.3 m and 0.2 m/s,0.125 m and 0.155 m/s,0.086 m and 0.128 m/s per kilometer width,*** summer saltmarsh area 54.2 km2 on CMDS protects approximately 32 km^(2)land area behind the seawall from being flooded,equivalent to the seawall heightening of approximately 0.42 m on equivalent flood *** performance of cost-and-benefit analysis shows a relatively higher(by 3%–7%)net present value(NPV)and a higher(by 1.5 times)benefit-cost ratio(BC)of nature-based solution(i.e.,saltmarsh restoration)compared with traditional hard engineering solution(i.e.,seawall construction).Thus,building seawall with nature,such as a hybrid flood protection measure,should be implemented in the future coastal redesign and maintenance.

关键词： nature-based flood protection storm wave mitigation numerical simulation cost-benefit analysis Chongming Dongtan Shoal

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