월단위 토양유실가능성 추정을 위한 ArcGIS 기반의 모형 개발

초록

Soil erosion has been issued in many countries since it causes negative impacts on ecosystem at the receiving water bodies. Therefore best managementpractices to resolve the problem in a watershed have been developed and implemented. As a prior process, there is a need to define soil erosion level andto identify the area of concern regarding soil erosion so that the practices are effective as they are designed. Universal Soil Loss Equation (USLE) weredeveloped to estimate potential soil erosion and many Geographic Information System (GIS) models employ USLE to estimate soil erosion. SedimentAssessment Tool for Effective Erosion Control (SATEEC) is one of the models, the model provided several opportunities to consider various watershedpeculiarities such as breaking of slope length, monthly variation of rainfall, crop growth at agricultural fields, etc. SATEEC is useful to estimate soilerosion, however the model can be implemented with ArcView software that is no longer used or hard to use currently. Therefore SATEEC based onArcView was rebuild for the ArcGIS software with all modules provided at the previous version. The rebuilt SATEEC, ArcSATEEC, was programmedin ArcPy and works as ArcGIS Toolset and allows considering monthly variations of rainfall and crop growth at any watershed in South-Korea. ArcSATEEC was applied in Daecheong-dam watershed in this study, monthly soil erosion was estimated with monthly rainfall and crop growthvariation. Annual soil erosion was computed by summing monthly soil erosion and was compared to the conventional approach to estimate annual soilerosion. The annual soil erosion estimated by the conventional approach and by summing monthly approach did not display much differences, however,ArcSATEEC was capable to provide monthly variation of soil erosion.

키워드