| Title: | Hydrologic response unit routing in SWAT to simulate effects of vegetated filter strip for South-Korean conditions based on VFSMOD |
| Authors: | Park, Y.S., J.H. Park, W.S. Jang, J.C. Ryu, H. Kang, J. Choi and K.J.Lim |
| Year: | 2011 |
| Journal: | Water |
| Volume (Issue): | 3 |
| Pages: | 819-842 |
| Article ID: | |
| DOI: | 10.3390/w3030819 |
| URL (non-DOI journals): | |
| Model: | SWAT (modified) |
| Broad Application Category: | hydrologic and pollutant |
| Primary Application Category: | BMP and/or cropping system assessment |
| Secondary Application Category: | sediment loss and transport |
| Watershed Description: | 25 ha Jaun-ri in central South Korea |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | The Soil and Water Assessment Tool (SWAT) model has been used worldwide
for many hydrologic and Non-Point Source (NPS) Pollution analyses on a watershed scale.
However, it has many limitations in simulating the Vegetative Filter Strip (VFS) because it
considers only ‘filter strip width’ when the model estimates sediment trapping efficiency
and does not consider the routing of sediment with overland flow which is expected to
maximize the sediment trapping efficiency from upper agricultural subwatersheds to lower
spatially-explicit filter strips. Therefore, the SWAT overland flow option between
landuse-subwatersheds with sediment routing capability was enhanced by modifying the
SWAT watershed configuration and SWAT engine based on the numerical model
VFSMOD applied to South-Korean conditions. The enhanced SWAT can simulate the VFS
sediment trapping efficiency for South-Korean conditions in a manner similar to the desktop
VFSMOD-w system. Due to this enhancement, SWAT is applicable to simulate the effects
of overland flow from upper subwatersheds to reflect increased runoff volume at the lower
subwatershed, which occurs in the field if no diversion channel is installed. In this study, the
enhanced SWAT model was applied to small watersheds located at Jaun-ri in South-Korea
to simulate a diversion channel and spatially-explicit VFS. Sediment can be reduced by
31%, 65%, and 68%, with a diversion channel, the VFS, and the VFS with diversion
channel, respectively. The enhanced SWAT should be used in estimating site-specific
effects on sediment reduction with diversion channels and VFS, instead of the currently
available SWAT, which does not simulate sediment routing in overland flow and does not
consider other sensitive factors affecting sediment reduction with VFS. |
| Language: | English |
| Keywords: | Vegetative Filter Strip; HRU Routing; SWAT; VFSMOD |