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Effects of Land Use Changes Across Different urbanization Periods on Summer Rainfall in the Pearl River Delta Core Area

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International Journal of Disaster Risk Science 2023年第3期14卷 458-474页

作者： Zhijun Yao Guoru Huang School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research Center of Safety and Greenization for Water Conservancy Project Guangzhou 510640China

The Pearl River Delta(PRD)is one of the three urban agglomerations in China that have experienced rapid *** this study,a core area of the PRD was identified,comprising the highly urbanized areas of Guangzhou,Foshan,Zhongshan,Zhuhai,Shenzhen,and Dongguan *** expansion of these urban areas was tracked across three time periods—the year population urbanization rate exceeded 70%(2000),18 years before(1982),and 18 years after(2018).This study used the Weather Research and Forecasting(WRF)model to explore summer rainfall changes across different urbanization periods in the PRD core *** results show that urban land expansion mainly occurred in the post urbanization *** changes acros s different urbanization periods were roughly consistent with previously observed spatial and temporal changes accompanying urban expansion in the PRD core *** rainfall mainly increased in the post urbanization period,shifting rainstorm center towards the PRD core *** causal analysis revealed that land use changes affected rainfall by altering thermodynamics and water vapor *** urban expansion changed the surface energy balance,resulting in increased surface heating and heat island *** heat island effects thickened the planetary boundary layer and increased vertical wind speeds,which initiated dry island effects,thereby causing more water vapor transportation to the ***,rainstorms and extreme rainfall events have become concentrated in urban areas.

关键词： Extreme rainfall Pearl River Delta core area South China urban expansion process urbanization periods Weather Research and Forecasting(WRF)model

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