Abstract
ABSTRACTBased on the statistical data of rainstorm-induced catastrophe about Shenzhen city during 1980–2014, this paper constructs a calculation model of disaster magnitude, which includes three influence factors: death toll, direct economic loss and disaster affected population. At the same time, the relationship between the disaster magnitude and the temporal, spatial and cause of the rainstorm-induced catastrophe about Shenzhen city is analysed, The results show that (1) The classification of catastrophe risk is carried out by the result of the disaster magnitude model. (2) The region where the disaster occurs frequently and seriously is located in the Midwest, and the disaster occurs infrequently and lightly is located in the south-east. (3) The rainstorm-induced catastrophe about Shenzhen City is mostly caused by persistent short-time heavy rainfall. While it occurs most frequently in July, and the most serious in September affected by the typhoon. (4) The main reasons for the occurrence of rainstorm-induced catastrophe about Shenzhen City are flood, waterlogging, tide and typhoon, of these factors waterlogging is the primary one. Finally, this paper puts forward the corresponding countermeasures of flood hazard mitigation in Shenzhen City.
Highlights
China’s urban environments are vulnerable to typhoons, rainstorm, floods and other meteorological disasters because of the global climate change and rapid urbanization; with the global climate changing, the intensity and frequency of extreme meteorological events have been increased
This paper puts forward the corresponding countermeasures of flood hazard mitigation in Shenzhen City
According to the model of flood disaster magnitude, a total of 40 rainstorm-induced catastrophes in Shenzhen from 1980 to 2014 were calculated; and the relative contribution rate of each influence factor to the disaster magnitude is analysed, including death population, disaster-affected population and direct economic loss, with the classification of catastrophe risk made by the result of the disaster magnitude model
Summary
China’s urban environments are vulnerable to typhoons, rainstorm, floods and other meteorological disasters because of the global climate change and rapid urbanization; with the global climate changing, the intensity and frequency of extreme meteorological events have been increased. Many researches carried on risk assessment of flood disaster based on historical flood assessment These researchers often focus on flood disaster without the special research on the risk of extreme disaster, for example, the rainstorm-induced catastrophe. Shenzhen City is vulnerable to extreme weather such as rainstorm-induced catastrophe It has not been thoroughly studied in the disaster magnitude in disaster classification to quantitative assessment. Based on the comprehensive evaluation of the total 40 times rainstorm-induced catastrophe from 1980 to 2014 about Shenzhen city, the classification of catastrophe risk is carried out by the result of the disaster magnitude model. The temporal–spatial distribution pattern of catastrophe studied through the relationship between the disaster magnitude and the temporal, spatial and cause of the rainstorm-induced catastrophe about Shenzhen City. Last but not the least, this paper puts forward the corresponding countermeasures of catastrophe risk mitigation about Shenzhen City, to provide some reference for the catastrophe risk management of rainstorm disaster
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