Econ. Environ. Geol. 2005; 38(6): 607-622

Published online December 31, 2005

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

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

Jae-Ho Kwak1, Dong-Yoon Yang1*, Hyun-Koo Lee2, Seong-Gu Lee1 and Ju-Yong Kim1

1Geological & Environment Hazards Division, Korea Institute of Geoscience & Mineral Resources, Daejeon 305-350, Korea
2Department of Geology, Chungnam National University, Daejeon 305-764, Korea

Correspondence to :

Dong-Yoon Yang

ydy@kigam.re.kr

Received: April 29, 2004; Accepted: December 13, 2005

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, Changjeongcheon 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 field (53,140.94 tons/ha/year), orchard (25,063.38 tons/ha/year), paddy field (6,506.7 tons/ha/year) and forest (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.

Keywords Soil loss, RUSLE, Watershed, Soil erosion hazard zone, GIS, REE

Article

Econ. Environ. Geol. 2005; 38(6): 607-622

Published online December 31, 2005

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

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

Jae-Ho Kwak1, Dong-Yoon Yang1*, Hyun-Koo Lee2, Seong-Gu Lee1 and Ju-Yong Kim1

1Geological & Environment Hazards Division, Korea Institute of Geoscience & Mineral Resources, Daejeon 305-350, Korea
2Department of Geology, Chungnam National University, Daejeon 305-764, Korea

Correspondence to:

Dong-Yoon Yang

ydy@kigam.re.kr

Received: April 29, 2004; Accepted: December 13, 2005

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, Changjeongcheon 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 field (53,140.94 tons/ha/year), orchard (25,063.38 tons/ha/year), paddy field (6,506.7 tons/ha/year) and forest (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.

Keywords Soil loss, RUSLE, Watershed, Soil erosion hazard zone, GIS, REE

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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