PROGRESS IN GEOGRAPHY ›› 2011, Vol. 30 ›› Issue (5): 545-549.doi: 10.11820/dlkxjz.2011.05.004

• Original Articles • Previous Articles     Next Articles

Characteristics and Influencing Factors of the Runoff and Sediment Transport in Jihe Watershed

WANG Yousheng1,2, YU Xinxiao1, HE Kangning1, ZHANG Zhengming1, XIN Zhongbao1, LI Qingyun1   

  1. 1. School of Soil andWater Conservation, Beijing Forestry University,Beijing 100083, China;
    2. Dingxi Station for Extending Agricultural Techniques of Gansu Province, Dingxi 743000, China
  • Received:2010-07-01 Revised:2011-01-01 Online:2011-05-25 Published:2011-05-25

Abstract: Based on the hydrologic and area precipitation data during the period of 1962 to 1989, the seasonal and annual changes of runoff and sediment were analyzed, and the influence of precipitation and human activities on the runoff and sediment were estimated. The results showed that the seasonal distribution of runoff and sediment yield was quite uneven. The runoff between July and October accounted for 61.6 percents of the year, and sediment yield from June to September made up 87.9% of the year. The annual distribution of runoff and sediment yield was quite different and the variation coefficients of annual sediment and runoff reached 0.725 and 0.573 respectively. The inter-annual changes of sediment were greater than that of runoff. The trend of runoff and sediment yield in the Jihe watershed declined evidently first and then remained steady during the research period. Soil and water conservation has played an important role in the descending of runoff and sediment discharge since the 1970s.

Key words: changes of runoff and sediment, Jihe watershed, Soil and water conservation, tendency analysis