Long time series of runoff variation in a typical watershed of Loess Plateau
Based on the runoff data from 1962 to 2008. the runoff variation in the typical watershed-Jihe (1,019 km2), located in the third sub-region of the Loess Plateau. was analyzed to further enhance our understanding on the impacts of land uses on hydrological elements. The results showed that the mean annual discharge achieved about 7.5x 107 m3; the average runoff depth was 76.15 mm; and the maximal and minimal runoff depths were 247.3 and only 1.7 mm respectively. It was observed that they presented evident downtrend during the research period, particularly since the late 1980s. The annual and inter-annual distributions of runoff were greatly unbalanced; the runoff between June and October accounted for approximately 70％ of the yearly runoff, and the variation coefficients of annual and inter-annual distribution reached l.13 and 0.75 respectively. It is concluded that the reasons influencing runoff changes are mainly caused by land use and cover change (LUCC) and climatic changes such as those involving precipitation and air temperature, especially in the late 1980s the activity of the conversion of sloping farmland to terrace dramatically impacted the runoff generation and routing processes in the watershed. Therefore the response of hydrological elements to LUCC is a significant research point in the future.
Jihe watershed time series discharge land uses anomaly
Qingyun Li Xinxiao Yu Zhongbao, Xin Jiangkun Zheng Yousheng Wang Guodong Jia
School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083,China School of Soil and Water Conservation,Beijing Forestrv University,Beijing.100083,China
国际会议
西安
英文
684-688
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）