Temporal and spatial variation of population exposure to heavy rain (a special study on Hubei Province)

Authors: Qinmei Han*, Beijing Normal University, Peijun Shi, Beijing Normal University
Topics: Hazards, Risks, and Disasters, China
Keywords: Heavy rain ;Population;Population Exposure ;Hubei Province
Session Type: Paper
Day: 4/10/2018
Start / End Time: 2:40 PM / 4:20 PM
Room: Jackson, Marriott, 5th Floor
Presentation File: No File Uploaded

Heavy rain (HR) is one of the most frequent and serious natural disasters in China. Under the background of climate change and globalization, many factors aggravate the impact of HR on population in China.It is of great significance to study on the temporal and spatial changes of population exposure to HR. According to the concept of exposure to natural disaster, this work analyzed the temporal and spatial variation of HR, population and population exposure to HR at two decades (1986-1995, 2006-2015) and four regions of Hubei Province in China. Then, we quantitatively decomposed the contribution rate of HR and population changes for HR exposure.
Comparing three indicators(Heavy Rain Amount, Heavy Rain Day, Heavy Rain Intensity), we found that the HR level was decreased in 2006-2015 period, but the area impacted by high-grade HRI was added by 10480 km2 in the 2006-2015 decade. Generally, the absolute value of population of Hubei showed an increasing trend, but the growth rate of 2006-2015 period was lower than that of 1986-1995 period. The spatial population distribution patterns of the two periods were similar: densely-populated in the southeast and sparsely-populated in northwest of Hubei. Then we counted population exposure to HR for different grade(5 grades) HRI, and analyzed the changes of population exposure to HR. The population exposure to HR of different HRI level totally increased by 4.741 million people.
Finally, we found that highest contribution of population exposure to HR in Hubei Province was heavy rain.

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