Abstract
The typhoon disaster chain is one of the leading climate risks in constructing the Guangdong–Hong Kong–Macau Greater Bay Area (GBA). In this study, the risks of the typhoon disaster chains including typhoon-induced gales, rainstorms, and storm surges in the GBA, as well as the comprehensive risk of typhoon disaster, are investigated at county level by comprehensively analyzing the hazard, exposure, and vulnerability. The results show that the high- and very-high-risk areas of typhoon–gale disaster chain are located in Zhuhai, Zhongshan, Foshan, Dongguan, central-southern Jiangmen, southern Shenzhen, and parts of Huizhou. The high- and very high-risk areas of typhoon–rainstorm disaster chain include Zhuhai, Zhongshan, Shenzhen, central-southern Foshan, northern Dongguan, central Jiangmen, and central Huizhou. Regarding the typhoon–storm surge disaster chain, the areas at high and very high risk are located in Zhuhai, eastern Zhongshan, and the coastal areas of the Pearl River Estuary. In addition, the comprehensive risk of typhoon disaster is very high in Zhuhai and high in Zhongshan, Jiangmen, Dongguan, and Shenzhen. By verifying the spatial correlation between typhoon disaster risk indexes and actual losses, it is found that the comprehensive risk index of typhoon disaster constructed in this study can better reflect the actual losses. Overall, the findings of this study can provide a scientific basis for typhoon disaster prevention and mitigation in the GBA, and it can also serve as a reference for typhoon disaster risk research in other areas.
Highlights
The typhoon disaster chain is a series of disaster phenomena caused by typhoons, and it is composed of gales, rainstorms, and storm surges, as well as a series of secondary disasters induced by them
From 2009 to 2020, there were 38 influencing typhoons in the Greater Bay Area (GBA), which were regarded as the samples of hazard index calculation in the county
We developed an objective typhoon risk index from the view of disaster chains
Summary
The typhoon disaster chain is a series of disaster phenomena caused by typhoons, and it is composed of gales, rainstorms, and storm surges, as well as a series of secondary disasters induced by them. 6.3% of the coastal areas in China have a high-risk level of typhoon-induced disasters, and they mainly concentrate in coastal river delta regions (Yin et al, 2013). Guangdong Province has the longest coastline in China, and its coastal cities have developed socioeconomic and a significantly larger population than other provinces. It is one of the provinces suffering from the most severe typhoon disasters in China (Wang R. et al, 2016; Luo et al, 2018). The Guangdong–Hong Kong–Macau Greater Bay Area (GBA), located in the central coastal area of Guangdong, is the most economically developed and densely populated region of Guangdong and is the region with the highest risk level of typhoon disaster (Yin et al, 2012; Xu et al, 2015). The typhoon disaster is one of the main climate risks in the construction of GBA in the future
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