Analysis of Runoff Variation and Its Related Driving Forces in the Luanhe River Basin
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Abstract:
According to the daily precipitation and the runoff data of the Luanxian station in the Luanhe River Basin from 1950 to 2009, the mathematical statistics method was applied in this study to analyze the inter-annual, inter-generation, and annual variation characteristics and trend of runoff, and to investigate the variation of precipitation in the Luanhe River Basin to help discover the effects of precipitation and human activities to runoff. The results showed that both the inter-annual and inter-generation runoff variations are apparent in the Luanhe River Basin, and high flow period occurred from 1950 to 1979 and low flow period appeared after 1980. Furthermore, the annual runoff of the Luanhe River Basin was unevenly distributed with 66.2% of runoff occurring from July to September. Both the runoff and precipitation of the Luanhe River Basin had the significant decreasing trend. During the period of 1959 to 1968, the increasing runoff in the Luanhe River Basin can be attributed to both the precipitation and human activities; while during the period of 1969 to 2009, human activity was the main reason for the decreasing of runoff.
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