Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Evaluation of Erosivity Index (EI) in Calculation of R Factor for the RUSLE

  • Kim, Hye-Jin (Dept. of Bio-Environmental Chemistry, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Song, Jin-A (Dept. of Bio-Environmental Chemistry, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Lim, You-Jin (Dept. of Bio-Environmental Chemistry, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Chung, Doug-Young (Dept. of Bio-Environmental Chemistry, College of Agriculture and Life Sciences, Chungnam National University)
  • Received : 2012.01.20
  • Accepted : 2012.02.09
  • Published : 2012.02.29
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Abstract

The Revised Universal Soil Loss Equation (RUSLE) is a revision of the Universal Soil Loss Equation (USLE). However, changes for each factor of the USLE have been made in RUSLE which can be used to compute soil loss on areas only where significant overland flow occurs. RUSLE which requires standardized methods to satisfy new data requirements estimates soil movement at a particular site by utilizing the same factorial approach employed by the USLE. The rainfall erosivity in the RUSLE expressed through the R-factor to quantify the effect of raindrop impact and to reflect the amount and rate of runoff likely is associated with the rain. Calculating the R-factor value in the RUSLE equation to predict the related soil loss may be possible to analyse the variability of rainfall erosivity with long time-series of concerned rainfall data. However, daily time step models cannot return proper estimates when run on other specific rainfall patters such as storm and daily cumulative precipitation. Therefore, it is desirable that cross-checking is carried out amongst different time-aggregations typical rainfall event may cause error in estimating the potential soil loss in definite conditions.

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