Spatial and temporal variation characteristics of drought in northwestern Liaoning Province
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Abstract:
Based on the basic data of 1971-2010 at 14 meteorological stations in northwestern Liaoning province, this paper selected four indexes (the precipitation anomaly, number of consecutive days without rain, river runoff anomaly, and relative humidity), and obtained the comprehensive drought level characteristic value of northwestern Liaoning province using the variable fuzzy evaluation method. Then it used the linear trend estimation method and Mann-Kendall test method to analyze the trend of drought and used the IDW method to analyze the spatial variation characteristics of comprehensive drought. The results show that the drought is growing significantly more serious. During 1971-1980, the drought was mostly mild, but was aggravated after the 1980s, and became the most serious during 1981-1990. The period of 1980-2010 witnessed a high incidence of severe droughts but few extremely severe droughts. The drought was more serious and was aggravated with time in the northeast and southwest of northwestern Liaoning province, but was less serious in the central region. Therefore, drought resistance and disaster reduction efforts should be mainly concentrated on the northeast and southwest of the region.
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