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Runoff Changes and Affecting Factors of the River in Water-Wind Erosion Crisscross Region
Pages: 180-188
Year: Issue:  2
Journal: Acta Scientiarum Naturalium Universitatis Neimongol

Keyword:  runoffaffecting factorsprecipitationdamwater-wind erosion crisscross region;
Abstract: The trend,the periodicity and the paroxysmal variation of the annual runoff in Xiliugou river,the typical river in water-wind erosion crisscross region,have been analyzed according with the measured data from 1960 to 2010,and the affecting factors were analyzed.Many research methods have been applied to this study,including the linear tendency estimate method,wavelet analysis method,the maximum entropy spectrum analysis method,Mann-Kendall test method and cumulative percentage anomaly method.The results were as follows:1)The runoff of Xiliugou varied a lot among different years.The overall trend was reducing but without significant difference among those years.2)According to the results drawn by wavelet analysis method and the maximum entropy spectrum analysis method,there were four period cycles of the annual runoff in the Xiliugou river,which were three-years,five-years,nine-years and twenty-one-years,respectively.The main period cycle was three-years.3)The paroxysmal variation has been studied using the Mann-Kendall test method and t-test method and the results show that a drastic runoff change may happened in the year 2004 and 2006.4)The runoff was mainly affected by the precipitation,and its peak-to-valley values and period cycle changed according to the precipitation.The dam that built on the river had a significant storage effect to the rainfall runoff and the runoff had a significant change since dams were built from the year 2000.
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