SWAT ArcView GIS Extension Patch를 이용한 소유역 분할에 따른 수문 및 유사 거동에 미치는 영향 평가 (Evaluation of Effects on SWAT Simulated Hydrology and Sediment Behaviors of SWAT Watershed Delineation using SWAT ArcView GIS Extension Patch)

서지정보

· 발행기관 : 한국물환경학회
· 수록지 정보 : 한국물환경학회지 / 24권 / 2호 / 147 ~ 155페이지
· 저자명 : 허성구, 김남원, 박윤식, 김종건, 김성준, 안재훈, 김기성, 임경재

초록

Because of increased nonpoint source runoff potential at highland agricultural fields of Kangwon province, effective
agricultural management practices are required to reduce the inflow of sediment and other nonpoint source pollutants into the
water bodies. The watershed-scale model, Soil and Water Assessment Tool (SWAT), model has been used worldwide for
developing effective watershed management. However, the SWAT model simulated sediment values are significantly affected
by the number of subwatershed delineated. This result indicates that the SWAT estimated watershed characteristics from the
watershed delineation process affects the soil erosion and sediment behaviors. However, most SWAT users do not spend time
and efforts to analyze variations in sediment estimation due to watershed delineation with various threshold value although
topography falsification affecting soil erosion process can be caused with watershed delineation processes. The SWAT model
estimates the field slope length of Hydrologic Response Unit (HRU) based on average slope of subwatershed within the
watershed. Thus the SWAT ArcView GIS Patch, developed by using the regression relationship between average watershed
slope and field slope length, was utilized in this study to compare the simulated sediment from various watershed delineation
scenarios. Four watershed delineation scenarios were made with various threshold values (700 ha, 300 ha, 100 ha, and 75 ha)
and the SWAT estimated flow and sediment values were compared with and without applying the SWAT ArcView GIS Patch.
With the SWAT ArcView GIS Patch applied, the simulated flow values are almost same irrespective of the number of
subwatershed delineated while the simulated flow values changes to some extent without the SWAT ArcView GIS Patch
applied. However when the SWAT ArcView GIS Patch applied, the simulated sediment values vary 9.7% to 29.8% with four
watershed delineation scenarios, while the simulated sediment values vary 0.5% to 126.6% without SWAT ArcView GIS
applied. As shown, the SWAT estimated flow and sediment values are not affected by the number of watershed delineation
significant compared with the estimated flow and sediment value without applying the SWAT ArcView GIS Patch.

영어초록

Because of increased nonpoint source runoff potential at highland agricultural fields of Kangwon province, effective
agricultural management practices are required to reduce the inflow of sediment and other nonpoint source pollutants into the
water bodies. The watershed-scale model, Soil and Water Assessment Tool (SWAT), model has been used worldwide for
developing effective watershed management. However, the SWAT model simulated sediment values are significantly affected
by the number of subwatershed delineated. This result indicates that the SWAT estimated watershed characteristics from the
watershed delineation process affects the soil erosion and sediment behaviors. However, most SWAT users do not spend time
and efforts to analyze variations in sediment estimation due to watershed delineation with various threshold value although
topography falsification affecting soil erosion process can be caused with watershed delineation processes. The SWAT model
estimates the field slope length of Hydrologic Response Unit (HRU) based on average slope of subwatershed within the
watershed. Thus the SWAT ArcView GIS Patch, developed by using the regression relationship between average watershed
slope and field slope length, was utilized in this study to compare the simulated sediment from various watershed delineation
scenarios. Four watershed delineation scenarios were made with various threshold values (700 ha, 300 ha, 100 ha, and 75 ha)
and the SWAT estimated flow and sediment values were compared with and without applying the SWAT ArcView GIS Patch.
With the SWAT ArcView GIS Patch applied, the simulated flow values are almost same irrespective of the number of
subwatershed delineated while the simulated flow values changes to some extent without the SWAT ArcView GIS Patch
applied. However when the SWAT ArcView GIS Patch applied, the simulated sediment values vary 9.7% to 29.8% with four
watershed delineation scenarios, while the simulated sediment values vary 0.5% to 126.6% without SWAT ArcView GIS
applied. As shown, the SWAT estimated flow and sediment values are not affected by the number of watershed delineation
significant compared with the estimated flow and sediment value without applying the SWAT ArcView GIS Patch.

참고자료

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