Estimation of the Amount of Soil toss and Main Sources of Riverbed Sediments in Each Tributary Basin of the Seomjin River in Sunchang Area, Korea

순창지역 섬진강 지류별 토양유실량 산정과 하상퇴적물의 주공급원에 관한 고찰

  • Kwak Jae-Ho (Geological & Environment Hazards Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Yang Dong-Yoon (Geological & Environment Hazards Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee Hyun-Koo (Department of Geology, Chungnam National University) ;
  • Kim Ju-Yong (Geological & Environment Hazards Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee Seong-Gu (Geological & Environment Hazards Division, Korea Institute of Geoscience & Mineral Resources)
  • 곽재호 (한국지질자원연구원 지질환경재해연구부) ;
  • 양동윤 (한국지질자원연구원 지질환경재해연구부) ;
  • 이현구 (충남대학교 지질환경과학과) ;
  • 김주용 (한국지질자원연구원 지질환경재해연구부) ;
  • 이승구 (한국지질자원연구원 지질환경재해연구부)
  • Published : 2005.12.01

Abstract

This study was carried out in order to evaluate where the soil loss was mainly occurred, .and to verify how riverbed sediments in the tributaries of the Seomjin River were related to their source rocks distributed in Sunchang area. The study area including the Seomjin River with 4 tributaries of Kyeongcheon, Okgwacheon, Changjeong-cheon and Ipcheon was divided into 10 watershed. The RUSLE (Revised Universal Soil Loss Equation) was estimated for all the grids (10 m cells) in the corresponding watershed. The amount of soil loss per unit area was calculated as follows: dry fold (53,140.94 tons/ha/year), orchard (25,063.38 tons/ha/year), paddy field (6,506.7 tons/ha/year) and Idlest (6,074.36 tons/ha/year). The differences of soil loss per unit area appear to be depends on areas described earlier. Soil erosion hazard zones were generally distributed within dry fields. Several thematic maps such as land use maps, topographical maps and soil maps were used as a data to generate the RUSLE factors. The amount of soil loss, computed by using the RUSLE, showed that soil loss mainly occurred at the regions where possible source rocks were distributed along the stream. Based on the this study on soil loss and soil erosion hazard zone together with chondrite-normalized REE patterns that were previously analyzed in same study area, a closed relationship between riverbed sediments and possible source rocks is formed. Especially in the Okgwacheon that are widely distributed by various rocks, chondrite-normalized REE pattern derived from the riverbed sediments, source rock and soil is expected to have a closed relationship with the distribution of soil loss.

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