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This article in SSSAJ

  1. Vol. 52 No. 3, p. 781-784
     
    Received: Aug 10, 1987


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doi:10.2136/sssaj1988.03615995005200030033x

Analysis of Erodibility of Two Tropical Soils Using a Process Model

  1. A. Lo,
  2. S. A. El-Swaify  and
  3. C. W. Rose
  1. Dep. of Agronomy & Soil Science, Univ. of Hawaii, Honolulu, HI 96822
    School of Australian Environmental Studies, Griffith Univ., Brisbane, Queensland, Australia 4111

Abstract

Abstract

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.

Contribution from the Dep. of Agronomy & Soil Science, Hawaii Inst. of Tropical Agriculture & Human Resources, Journal Series no. 3176. This work is partly funded by Grant no. 83-CRSR-2-2296. Section 406 (Food for Peace Act, PL 89-808).

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