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Runoff Variations in Jihe River Watershed of Loess Plateau from 1962 to 2008
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GUO Jun-ting1,ZHANG Zhi-qiang1,WANG Sheng-ping2,ZHANG Jian-jun1,Strauss Peter3(1.Institute of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China,2.North China Electric Power University,Energy and Environment Research Center,Beijing 102206,3.The Federal Institute of Land and Water Management Research,A-3252 Petzenkirchen,Austria)

Clc Number:

S273.29

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    Abstract:

    Based on the runoff data during the period between 1962and 2008,runoff variations in the Jihe river watershed(1019km2), located in the third sub-region of the Loess Plateau,were characterized using statistical analysis.The results indicate that the runoff presented a evident decreasing trend during the research period,and the runoff in the 1970s,1980s,1990sand 2000saccounted for 62.3%,61.1%,30.2% and 35.2% of the 1960srespectively,with an annual increasing rate of-2.7%and and a variation coefficient of 0.75.It was observed that inter-annual distribution of runoff was greatly unsteady,and the runoff percentages in flood seasons ranged from 50.8%to 95.2% with an average of 76.5%and a monthly variation coefficient of 1.13.According to wet and drought year classification of the runoff,Jihe river watershed has gone since the 1960s through the periods of wet year,average year,sub-wet year and drought year,respectively.The runoff decreased dramatically after 1990,lasting a nine-year period of drought,in coincidence with the large-scaled implementation of soil and water conservation.Thorough descriptions of the response of hydrological factors to land use and cover changes are another requirement for future study in the watershed.

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李庆云,余新晓,张璐,信忠保,贾国栋,王友生,郑江坤.黄土高原藉河流域1962-2008年径流变化特征[J].水土保持通报英文版,2011,(1):98-102

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History
  • Received:July 17,2010
  • Revised:August 17,2010
  • Online: October 25,2012

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