摘要
选择三峡库区大宁河流域为研究区，基于流域土地利用、土壤、地形及11个气象站8a气象数据等资料，利用分布式流域评价模型——AnnAGNPS研究了流域泥沙输移特性。结果表明，大宁河流域多年平均输沙量白上游巫溪站的1．25×10^6t／a，沿程递增至大昌站的1．81×10^6t／a，大昌站以下增加缓慢，到流域出口为1．95×10^6t／a；东溪河和巫溪站以下至大昌站的大宁河干流左岸区间是两大产沙集中区；全流域SDR值为0．30，各子流域SDR值变化范围为0．376～0．531，与相关文献研究结果一致；干流控制站点SDR值与流域站点控制面积呈负相关关系（r^2—0．73），但这种关系在各支流上不明显，这是由于各子流域地形、土壤、土地利用和降雨量空间异质性都很大，表明对于不同的流域，仅用SDR值与流域面积关系无法确切计算其SDR值。
Annualized Agricultural Non-Point Source model （AnnAGNPS）, a continuous-simulation model at watershed scale, simulates surface water, sediment, nutrients, and pesticides leaving the cells and their transport through watershed. The Daning River watershed is selected as a study case. The characteristics of sediment delivery are studied based on landuse, soil, topographic data, and eight-year climatic data from 11 meteorological stations. Averaged annual sediment load is 1.25 ×10^6t/a at the Wuxing station, rapidly rises up to 1.81×10^6t/a at the Dachang station, and reaches 1.95 ×10^6t/a at the watershed outlet. Xixi River, one of the biggest tributaries in the Daning River watershed, has the largest volume of water discharge up to 20.97% of the total at the watershed outlet. Dongxi River, the second tributary, has the most sediment load up to 26.88% of the total at the watershed outlet. In addition, the area of left bank in the middle watershed （from Wuxi station to Dachang station） is another large sediment source. The sediment delivery ratio （SDR） of the whole watershed is 0.30 in accordance with published references. Viewed from four main stream stations, i.e. Dongxi river outlet, Wuxi station, Dachang station, and the watershed outlet, the SDR is positively correlated with the watershed area. However, the relation is not significant in the six tributaries owing to the high variations of drainage area, slope, runoff-rainfall factors, land use/land cover, etc.
出处
《水土保持通报》
CSCD
北大核心
2009年第3期154-158,共5页
Bulletin of Soil and Water Conservation
基金
国家973项目(2003CB415201)
中国科学院知识创新工程重要方向项目(KZCX2-YW-422)
国家自然科学基金课题(40701059)
中国科学院西部行动计划项目(KZCX2-XB2-07-01)
关键词
ANNAGNPS模型
泥沙输移比
三峡库区
大宁河流域
AnnAGNPS model
sediment delivery ratio
Three Gorges Reservoir region
Darting River watershed
作者简介
花利忠（1978-），男（汉族），山西省晋中市人，博士后，主要从事流域侵蚀产沙模拟和城市生态环境规划研究。izhong2008@yahoo．com．cn。
