Sediment Sources of Yangou Watershed in the Loess Hilly Region China Under a Certain Rainstorm Event
At present the large scale vegetation restoration and intensive oil exploiting had brought huge influence on local environment in Yanan region. the sediment yield data form series experiment plots and hydrological monitoring station in the Yanan watershed after one rainfall event on July 2, 2005. which included sediment from different land uses (crop-land plot, vegetation plots, hard road surface) and 3 types roads(mountain-road brunches, mountain-road, and mountain-transport way) has been analyzed. Results showed that the erosion intensity of the 3 type roads was respectively 500 t/km2. 3163 t/km2. and 13500 t/km2. The sediment from cropland and grass, shrub land was within 6-184 t/km2. It stated that sediment from road area which only covered 1％ of total area accounted for 42.3％ of the total sediment yield, far beyond that from other uses of land. Sediment from grass-land and shrub-land, which covered 70.5％ of watershed area, shared 26.7％ of the total sediment. The further analysis showed that the 41.2％ of total sediment could be detained by re-vegetation. On the contrary, that road constructing brought heavy sediment which offset the benefit of vegetation restore by 58.4％. the suggestion were to adjust our strategy from slope management to the road erosion mitigation.
Sediment yield Land use Rainfall event Road erosion Yangou watershed
Xue-xuan Xu Tong-jun Ju Shi-qing Zheng
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources,712100,Yangling, Shaanxi, China
国际会议
西安
英文
115-120
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）