Soil erosion on interrill areas such as row sideslopes is a major
source of sediment for land without soil cover (Meyer and Harmon,
1989) and has been identified as one of the major processes
contributing to soil and water quality degradation. Interrill erosion
can be described as a combination of two sub-processes: splash and
wash dynamics. These two distinct sub-processes were considered in
some erosion models such as LISEM (Limburg Soil Erosion Model) (De
Roo, 1996), EUROSEM (EUROpean Soil Erosion Model) (Morgan et al.,
1998) and TEST (Terrace Erosion and Sediment Transport model)
(Van Dijk and Bruijnzeel, 2003) and have been investigated in some
studies. Luk (1979) measured total splashed loss and wash loss from
plots of 30.5×30.5 cm2 and found that total splash loss was greater
than wash loss. Mermut et al. (1997) also found that total splashed
loss was much higher than wash loss when a cylindrical soil tray of
30 cm diameter was used. The studies of Sutherland et al. (1996) and
Wan et al. (1996) found that both downslope splash and total splash
(lateral+down+top) were greater than wash on the slopes from 5°
to 20°. Van Dijk et al. (2003a) conducted the experiments on the
slopes of 0°, 5°, 15° and 40° under natural rainfall and also obtained
that both downslope splash and total splash (lateral+down+top)
were higher than wash. However, some published data indicate that
splash loss was less than wash loss in interrill areas. Bryan and Luk