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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  

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)
Publication Information
Economic and Environmental Geology / v.38, no.6, 2005 , pp. 607-622 More about this Journal
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.
Keywords
Soil loss; RUSLE; Watershed; Soil erosion hazard tone; GIS; REE;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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