利用SEDD模型模拟岷江上游小流域的年产沙量  

Annual sediment yield in sub-watersheds at upper reaches of Minjiang River:A simulation with SEDD model

作　　者：杨孟[1] 李秀珍[1] 胡远满[1] 何兴元[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《应用生态学报》2007年第8期1758-1764,共7页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展规划资助项目(2002CB111506)

摘　　要：以GIS为平台,建立了泥沙输移分布模型SEDD(sediment delivery distributed model),包括模拟流域年侵蚀量的修正通用水土流失方程RUSLE(revised universal soil loss equation)和模拟泥沙输移比SDR(sediment delivery ratio)的方程.利用该模型模拟了岷江上游黑水、镇江关流域的年侵蚀、产沙量及其空间分布特征.模拟结果表明:两个流域侵蚀强度以轻度和中度侵蚀为主,并伴有强度侵蚀;流域产沙量低,不到侵蚀总量的5%;泥沙输移比与流域产沙量的空间分布相似,均呈现在河流附近较高、其他区域接近零的格局;灌木林地和林地是主要的产沙源,两种类型的产沙量之和约占流域总产沙量的70%.Based on GIS, a sediment delivery distributed （SEDD） model was established to simulate the spatial patterns of annual soil water erosion and sediment yield in two sub-watersheds at the upper reaches of Minjiang River. The model was based on the revised universal soil loss equation （RUSLE） for calculating the annual soil water erosion, and coupled with an equation for evaluating the sediment delivery ratio of each cell. The results showed that in most regions of the two sub-watersheds, erosion intensity was below high level. Similar spatial patterns of sediment delivery ratio and sediment yield were observed, i. e. , being higher along river, and approached to zero in other regions. Most parts of eroded soil were deposited in the sub-watersheds during their transportation, and less than 5% of it reached the river. Shrub land and forestland were the most important sources of sediment yield, and the sum of their sediment yield occupied 70% of the total.

关 键 词：岷江上游 土壤侵蚀 产沙量模拟 泥沙输移比 

分 类 号：S157[农业科学—土壤学]