Validating and Improving Interrill Erosion Equations

摘要: Existing interrill erosion equations based on mini-plot experiments have largely ignored the effects of slope length and plot size rate. This paper describes a series simulated rainfall which were conducted according to randomized factorial design for five lengths (0.4, 0.8, 1.2, 1.6, 2 m) at width 0.4 m, gradients (17%, 27%, 36%, 47%, 58%), intensities (48, 62.4, 102, 149, 170 mm h(-1)) perform systematic validation existing mini-plots. The results indicated that do not adequately describe relationships between rate its influencing factors with increasing intensity. Univariate analysis variance showed runoff rate, intensity, gradient, had significant their interactions p = 0.01. An improved equation was constructed by analyzing sediment concentration length, gradient. In equation, factor are same as in Water Erosion Prediction Project (WEPP), weight intensity adjusted an exponent 0.22 term added -0.25. Using experimental data from WEPP cropland soil field erodibility experiments, it has been shown relationship reasonably well better than equations.