Analysis of Erodibility of Two Tropical Soils Using a Process Model
- A. Lo,
- S. A. El-Swaify and
- C. W. Rose
Field-scale runoff and sediment data obtained by rainfall simulation are conventionally analyzed to derive empirical erodibility such as the K-factor in the universal soil loss equation (USLE). In this study such data were obtained under standardized rainstorms on two highly weathered tropical soils from Hawaii (Typic Torrox and Hydric Dystrandept). In addition, a simplified version of a physicallybased model which embodies the processes of rainfall detachment, runoff detachment (entrainment) and deposition (sedimentation) was used to analyze the same data set. Higher USLE erodibility values corresponded well with higher values for the entrainment efficiency of overland flow. It was concluded that this process-based model can complement the empirical USLE to provide a transferable quantitative understanding of soil susceptibility to erosion.
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