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Analysis of Drought-flood Spatial-temporal Characteristics Based on Standard Precipitation Index in East Region of Gansu in Recent 40 Years
WANG Yuan-yuan, ZHANG Bo
JOURNAL OF NATURAL RESOURCES ›› 2012, Vol. 27 ›› Issue (12) : 2135-2144.
PDF(3047 KB)
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Analysis of Drought-flood Spatial-temporal Characteristics Based on Standard Precipitation Index in East Region of Gansu in Recent 40 Years
The characteristics of drought and flood in east region of Gansu are shown based on monthly precipitation data of 15 meteorological stations from 1971 to 2010 by means of different scales of standard precipitation index, combined with GIS spatial analysis techniques and mathematical statistical theory. The characteristics of drought and flood were quantitatively analyzed and the evolution of the spatial and temporal change of precipitation was illuminated. The results showed that: over the past 40 years, there was a slow decreasing trend of average monthly standard precipitation index (SPI) and an evolution trend of drought was showed in east region of Gansu. Droughts and floods are frequent in the study area from 1971 to 2000, there were seven drought events and five flood events during the 30 years, but frequency of drought and flood was smaller from 2001 to 2010. The weakly increasing trends of spring, summer and winter drought were shown but drought and flood in fall was in a balanced state. There are three types of spatial distribution of precipitation in the area, and were divided into three regions accordingly, i.e., Southeastern (waterlogging area), Northern (arid area) and Midwest (precipitation comfort zone). Meanwhile, seasonal drought and flood differ greatly in spatial distribution, of which Huanxian and Huachi counties in the north are dry generally in summer, autumn and winter, and Jingning in the west tends to be dry in winter, spring and summer; but there are more rainfall in all seasons and easy to form waterlogging in central Xifeng, Zhenyuan and the southern Jingchuan, Chongxin and Huating.
drought-flood / standard precipitation index (SPI) / east region of Gansu {{custom_keyword}} /
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