Journal of Korean Society of Rural Planning (농촌계획)

Korean Society of Rural Planning (한국농촌계획학회)
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Estimation of the Forestry Area Decrease Effect on the Soil Erosion in Rural Watershed

농촌유역의 산림지 면적 감소에 따른 유역 토양유실량 변화 추정

  • Kim, Sang-Min (Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Im, Sang-Jun (Korea Institute of Construction Technology) ;
  • Park, Seung-Woo (Department of Agricultural Engineering, Seoul National University)
  • Published : 2004.02.25
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Abstract

In this paper, forestry area change effect on the soil erosion in Asan lake watershed was estimated. Temporal variations of land use in the study watershed were analyzed from Landsat-5 TM remote sensing images. Geographic Information System (GIS) combined with Universal Soil Loss Equation (USLE) was used to estimate the soil erosion of Asan lake watershed. Spatial data for each USLE factors was obtained from the Landsat-5 TM remote sensing images and 1/25,000 scale digital contour maps. Sediment yield to Asan lake was estimated by sediment delivery ratio and sediment accumulation in lake was estimated by trap efficiency. The estimation methods were validated for sediment accumulation in Asan lake. From the hydrographic survey from 1974 to 2003 for Asan lake, sediment accumulation was measured. The estimated accumulation sediment of 303,569ton/yr showed similar value with observed of 295,888ton/yr. From the validated estimation methods, the increasing amount of soil erosion when 1% of forest area in Asan lake watershed decreases was calculated from 12.91 to 1482.05ton/yr.

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References

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