The Characteristics of Waterlogging in the Pearl River Delta Urban Agglomeration from 2007 to 2019

Abstract

With the advancement of urbanization, waterlogging disasters in China’s urban areas have increased significantly, especially in the Pearl River Delta region. Based on the literature published by government departments, this study analyzed the characteristics of urban waterlogging in the Pearl River Delta region from 2007 to 2019. The results show that the frequency and intensity of waterlogging disasters in the Guangdong-Hong Kong-Macao Greater Bay Area are very high. The types of rainfall that cause flooding mainly include strong convection, frontal rain and typhoon rain. In Guangzhou, the causes of waterlogging can be divided into external and internal causes. The external causes are extremely heavy rainfall and the tidal flooding of the outer river. The internal causes mainly include the hydrological effect of urbanization, the low standard of the drainage system, the insufficient function of flood drainage, and the poor management of flood control projects. These information determined in this study facilitates reasonable flood mitigation measures to be developed at the most critical locations in this region.