Effects of Urbanization on Changes in Precipitation Extremes in Guangdong-Hong Kong-Macao Greater Bay Area, China
Author:
Yang Fang12, Wang Xinghan134, Zhou Xiaoxue14, Wang Qiang13, Tan Xuezhi56
Affiliation:
1. Pearl River Water Resources Research Institute, Pearl River Water Resources Commission, Guangzhou 510610, China 2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China 3. Key Laboratory of the Pearl River Estuary Regulation and Protection of Ministry of Water Resources, Guangzhou 510610, China 4. Key Laboratory of Water Security Guarantee in Guangdong-Hong Kong-Marco Greater Bay Area of Ministry of Water Resources, Guangzhou 510610, China 5. Center of Water Resources and Environment, School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China 6. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
Abstract
Complex interaction between urbanization and climate change has been showing significant impacts on natural and human ecosystems. Increasing urban flooding and waterlogging are associated with urbanization. The Guangdong-Hong Kong-Macao Greater Bay Area (GBA) experiences a rapid and extensive urbanization, leading to intensified land use and cover changes. Concurrently, the frequent occurrence of extreme precipitation events pose great challenges of urban flood control and water resource management to GBA. This research statistically analyzes the spatiotemporal evolution characteristics of precipitation extremes from 1979–2018 which relates to the urbanization in GBA using various statistical methods including the Mann-Kendall test, bivariate Moran’s test, and Spearman correlation analyses. The findings indicate that the impervious surface area in GBA exhibited a nonlinear growth trend from 1985–2018, particularly concentrated in the five major cities, i.e., Guangzhou, Foshan, Dongguan, Shenzhen, and Zhongshan. GBA urbanization can be categorized into three stages including Stage I (pre-1990, no urbanization), Stage II (1991–2009, rapid urbanization), and Stage III (2010–2018, slow urbanization). Compared to cities with low urbanization, the highly urbanized areas of GBA, including Guangzhou, Foshan, Zhongshan, and Dongguan, show statistically significant increases in precipitation extremes. The increasing trends of seven extreme precipitation indices show significant positive, spatiotemporal correlations with the change rate of urbanization in GBA. Moreover, the influence of urbanization on precipitation extremes in highly urbanized regions of the GBA is progressively strengthened along with urban development. During the stage of slow urbanization, urbanization contributes to 56.13% of increase in annual precipitation totals in GBA, and its contribution to increases in precipitation extremes ranges from 20–80%.
Funder
Effect of changes of underlying surface on precipitation based on radar and optical remote sensing: A case study of Guangzhou City Key technologies for “air-sky-earth” stereoscopic observation of water safety elements in the Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen Smart Water Project Phase I—Soil and water conservation Information construction project annual China Land Cover Dataset China Meteorological Forcing Dataset National Key R&D Program of China
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
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