AN APPROACH TO EVALUATE VEGETATIVE FILTER STRIP IN WATERSHED SCALE

作者：Sebti S; Rudra R P^*

来源：Applied Engineering in Agriculture, 2010, 26(5): 817-826.

• Vegetative filter strip
• AGNPS
• VFSMOD
• Sediment transport
• Non-point source pollution control

Runoff and sediment generated within drainage area of a stream (hillslope catchment) enter the stream through well-defined flow-paths Vegetated Filter Strip (VFS), when constructed downstream of the flow-paths, within the buffer wile of the stream, can effectively trap sediments and pollutants carried by runoff The amount of sediments and nutrients entering the stream varies along the stream Therefore the maximum effectiveness of the VFS in watershed context could be achieved by proper selection of the location and size of the VFS along the stream as the performance of the VFS is strongly affected by the amount of runoff and sediment entering the VFS This study focused on the development of a watershed-based approach to evaluate the performance of vegetative filter strip by integration of a vegetative filter strip model (VFSMOD) with a watershed-scale hydrology and sediment transport model (AGNPS) The methodology developed consists of extracting geometrical and land surface environment information from GIS-based data to generate Input data for AGNPS model, estimation of the amount of sediment, and runoff for each flow-path within the hillslope catchment using AGNPS model, and the use of AGNPS outputs to generate input data for the VFSMOD model, to examine the effectiveness of VFS in reducing the sediment entering the stream network The developed methodology was applied to a sample watershed in Ontario and the amount of runoff, peak flow and sediment load, with and without VFS, were compared for different scenarios

• 出版日期2010-9