Understanding the spatial and temporal development of erosion in the interrill and rill areas can be useful to locate sources of sediment and the spatial erosion pattern, and to determine the sediment delivery down slope. However, the measurement of erosion processes in the rill-interrill area has been only limited to small plot laboratory research. Measurements of soil loss at field condition have been traditionally based on test plots and empirical erosion models. Accuracy and reliability of test plot data is reduced because commonly there is missing data during extreme events due to overflow of tanks. Universal Soil Loss Equation (USLE) and Revised USLE (RUSLE) consider erosion only on planer surfaces; these are unsuited for effects of complex topography on the erosion process (Warren et al., 2000; Kinnell, 2004). These models do not account deposition and limited to give detail spatial erosion processes, and will generally overestimate actual erosion (Mitasova et al., 1998; Warren et al., 2000; 2005; Kinnell, 2004).
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