The relationship of soil loss by interrill erosion to slope gradient.

摘要: Abstract The influence of slope gradient on erosion rate differs for rill and interrill conditions. Rill increases substantially more with increasing than erosion. Combining the two processes into single data sets led to development regression equations (e.g., USLE) that overestimated effect low gradients short slopes. This study investigated change in examined its relationship runoff velocity. A sandy loam (grey brown luvisol) was packed 100×40×10 cm3 soil trays subjected simulated rainfall a period 75 min. Rain-impacted flow downslope splash were monitored, velocity measurements made at three positions within flume. Downslope never accounted 20% total peaked early simulation then decreased constant rate; therefore probably detachment-limited. For rate, rain-impacted increased roughly square root gradient, as did Soil loss correlated (0.81) under experimental