Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Simulations of Reduction Effects on Runoff and Sediment for VFS Applications by Considering Uplands Characteristics in Iksan

익산 밭경지 특성을 고려한 초생대 유출 및 유사 저감효과 모의

  • Lee, Seul Gi (Dept. of Agricultural Civil Eng. Kyungpook National University) ;
  • Jang, Jeong Ryeol (Rural Research Institute, Korea Rural Community Corporation) ;
  • Choi, Kyung Sook (Dept. of Agricultural Civil Eng. Kyungpook National University)
  • Received : 2014.09.11
  • Accepted : 2014.09.24
  • Published : 2014.09.30
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Abstract

The goal of this study was to evaluate sediment reduction effects of VFS (vegetative filter strip) applied for Iksan area in Saemangeum watershed. This study simulated runoff and sediment load from different types of uplands using VFSMOD-W. The general upland characteristics of the study area was investigated to build reasonable scenarios of the simulation. The simulation scenarios were designed by various areas, shapes, and slopes of uplands. Grass mixture was selected as VFS vegetation and the size of VFS was fixed as 10 % of uplands area. Additionally 50mm, 100mm, 150mm of daily rainfall were applied for the runoff and sediment simulation. As results, the calculated runoff and sediment loads were obtained $20.7{\sim}1,030.6m^3$ and 568.4~675,731.4 kg for the range of 0.1~1.0 ha of uplands with 7 % and 15 % slopes. The reduction effects on runoff and sediment were obtained 5~10 % and 21.0~47.7 % respectively from VFS applications. The VFSMOD-W simulations showed that runoff tended to increase as upland area and amount of rainfall increased while sediment increased when slope, length and area of uplands and amount of rainfall increased. These results indicated that rainfall amount and upland size are the critical factors for the generation of runoff and sediment load. In order to support this conclusion, further studies such as, long term monitoring, field experiments, and to calibrate and evaluate the model are necessary.

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