| Assessment and division of drought hazard risk in Shiyang River basin based on GIS |
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| DOI：10.7606/j.issn.1000-7601.2014.02.004 |
| Key Words: drought disaster distribution risk assessment Shiyang River basin |
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| Abstract: |
| Based on the meteorological observational data in Shiyang River basin from 1961 to 2010, the characteristics of spatial, interannual and decadal drought disaster distribution were analyzed. According to the dangerousness of disaster factors, vulnerability of disaster bearers, exposure degr
ee of hazard-bearing bodies and capability of disaster prevention and mitigation, the assessment and regional division of drought hazard risk in Shiyang River basin were conducted based on GIS. The results showed that the frequency of drought in spring, early summer and hot summer during 1960—2011 was 21.2%～67.3%, 13.5%～61.5% and 21.2%～86.5%, respectively, and the frequency of particular drou
ght in spring, early summer and hot summer in down-stream areas was wholly higher than that in up-middle stream areas. The areas with high comprehensive drought risk included Mingqin County, most part of Jinchuan District, north and central part of Liangzhuo District and east part of Yongchang County, where were located in the mid-down stream of Shiyang River basin. Among the studied counties and districts, Mingqin County located in the down-stream was the highest in comprehensive drought risk, followed by Jinchuan District, and Tianzhu County was the lowest in drought risk. |
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