中文摘要：

为探讨运用数学模型进行植被过滤带效果评估的方法，以陕西黑河水源区为例，通过植被过滤带水文及泥沙输移模型，分析了植被过滤带的带宽及坡度对人流泥沙净化效果的影响，确定适宜的植被过滤带设置方法，并采用污染负荷-泥沙关系法对植被过滤带的流域非点源污染负荷削减效果进行估算。结果表明：草地植被过滤带带宽以3～5m为宜，且应设置于坡度小于60°的河岸岸坡；在黑河水源区内的可设带区域全部设置植被过滤带后，将削减泥沙负荷的21．7％，TP负荷的12．4％和TN负荷的14．3％，植被过滤带能够在黑河水源区的水质保护中起到重要作用。

英文摘要：

In order to investigate the feasibility of using numerical simulation to assessing the effectiveness of vegetative filter strips （VFS）, the vegetative filter strip hydrology and sediment transport model （VFSMOD） is applied to the Heihe River headwaters area. The effect of VFS＇ width and slop on the removal rate of sediments is estimated by VFSMOD, and the appropriate design is subsequently determined for a VFS system. The VFS effectiveness for the load reduction of nonpoint source pollution in a watershed is assessed with the linear relationship between the sum of total phosphorus （TP） and total nitrogen （TN）, and sediments. The results show that a grass filter strip with width in the range of 3 -5 m is advisable and the slop gradient should be less than 60 . The reduction of sediments, TP and TN would be 21.7% , 12.4% and 14.3% , respectively, after the installation of VFSs on all sensitive riparian zones of the Heihe River headwaters area. The study demonstrates that VFS can play an important role in the water quality control for the Heihe River headwaters area.