Spatial-temporal variation of precipitation in West Liao River Basin during 1961-2014
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Abstract:
Based on the annual precipitation in West Liao River Basin from 1961 to 2014, we established a variation diagnosis system that integrated preliminary diagnosis, which was based on hydrograph, moving average, and Hurst index, with detailed diagnosis, which was based on correlation coefficient, Mann-Kendall mutation test, moving T-test, and wavelet analysis. We also focused on the spatial-temporal distribution of the annual precipitation in the recent ten years (2005~2014), and compared the annual mean precipitation in this period with the annual mean precipitation during the five periods of 1961-2014, 1961-1970, 1971-1980, 1981-1990, and 1991-2000. Using the Kriging method, we described the spatial-temporal variation of the precipitation in the recent ten years on ArcGIS Platform. The results showed that the annual precipitation during 1961-2014 was slightly decreasing, but with a potential to increase in the future. Its primary periods were 6, 18 or 30a. The year of 1998 witnessed an abrupt change in the annual precipitation. Regarding spatial distribution, the variation degree of annual precipitation generally expanded from the southwest and east of the basin to the north. The recent ten years were dry years. The precipitation in this period was generally less than that in the above-mentioned five periods.
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