Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analysis of Soil Erosion and Sediment Yields at the Doam-dam Watershed considering Soil Properties from the Soil Reconditioned Agricultural Fields using SATEEC System

SATEEC 시스템을 이용한 객토 토양의 토성고려에 따른 도암댐 유역의 토양유실 및 유사량 분석

  • Yoo, Dongsun (Division of Agricutural Engineering, Kangwon University) ;
  • Ahn, Jaehun (National Institute of Highland Agriculture, Rural Development Administration) ;
  • Yoon, Jongsuk (Division of environment civil Engineering, Inha University) ;
  • Heo, Sunggu (Division of Agricutural Engineering, Kangwon University) ;
  • Park, Younshik (Division of Agricutural Engineering, Kangwon University) ;
  • Kim, Jonggun (Division of Agricutural Engineering, Kangwon University) ;
  • Lim, Kyoung Jae (Division of Agricutural Engineering, Kangwon University) ;
  • Kim, Ki-sung (Division of Agricutural Engineering, Kangwon University)
  • 유동선 (강원대학교 농업공학부) ;
  • 안재훈 (농업진흥청 고령지 농업연구소) ;
  • 윤정숙 (인하대학교 환경토목공학부) ;
  • 허성구 (강원대학교 농업공학부) ;
  • 박윤식 (강원대학교 농업공학부) ;
  • 김종건 (강원대학교 농업공학부) ;
  • 임경재 (강원대학교 농업공학부) ;
  • 김기성 (강원대학교 농업공학부)
  • Received : 2007.05.31
  • Accepted : 2007.06.28
  • Published : 2007.07.30
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Abstract

There have been serious soil erosion and water pollution problems caused by highland agriculture practices at Doam-dam watershed. Especially agricultural activities, chemical and organic fertilizer and pesticide applications, soil reconditioning to maintain soil fertility are known as primary causes of soil erosion and water qaulity degradation in the receiving water bodies. Among these, soil reconditioning can accelerate soil erosion rates. To develop soil erosion prevention practices, it is necessary to estimate the soil erosion from the watershed. Thus, the Universal Soil Loss Equation (USLE) model has been developed and utilized to assess soil erosion. However, the USLE model cannot be used at watershed scale because it does not consider sediment delivery ratio (SDR) for watershed application. For this reason, the Sediment Assessment Tool for Effective Erosion Control (SA TEEC) was developed to assess the sediment yield at any point in the watershed. The USLE-based SA TEEC system can estimate the SDR using area-based SDR and slope-based SDR module. In this study, the SATEEC system was used to estimate soil erosion and sediment yield at the Doam-dam watershed using the soil properties from reconditioned agricultural fields. Based on the soil sampling and analysis, the US LE K factor was calculated and used in the SA TEEC system to analyze the possible errors of previous USLE application studies using soil properties from the digital soil map, and compared with that using soil properties obtained in this study. The estimated soil erosion at the Doam-dam watershed without using soil properties obtained in the soil sampling and analysis is 1,791,400 ton/year (123 ton/ha/year), while the soil erosion amount is 2,429,900 ton/year (166.8 ton/ha/year) with the use of soil properties from the soil sampling and analysis. There is 35 % increase in estimated soil erosion and sediment yield with the use of soil properties from soil reconditioned agricultural fields. Since significant amount of soil erosion are known to be occurring from the agricultural fields, the soil erosion and sediment yield from only agricultural fields was assessed. The soil erosion rate is 45.9 ton/ha/year without considering soil properties from soil reconditioned agricultural fields, while 105.3 ton/ha/year after considering soil properties obtained in this study, increased in 129%. This study shows that it is very important to use correct soil properties to assess soil erosion and sediment yield simulation. It is recommended that further studies are needed to develop environment friendly soil reconditioning method should be developed and implemented to decrease the speed of soil erosion rates and water quality degradation.

Keywords

Acknowledgement

Supported by : 고령지 농업연구소

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