EVALUATION OF A FUNDAMENTALLY BASED DETACHMENT MODEL

This is the second of two articles that develops and evaluates a fundamentally based detachment model. In this article, the proposed model is evaluated by the predictive accuracy of observed incipient motion and rill erosion data. Observed incipient motion of noncohesive particles was used to assess the general framework of the proposed approach because the parameters could be estimated without calibration. A simple two-dimensional representation of particles is used to estimate erodibility characteristics. The model accurately represented observed incipient motion values. The model was evaluated for cohesive particles using 373 rill erosion data sets of detachment and shear values. Here the parameters of the model were lumped into two parameters to allow comparison with the widely-used excess shear detachment approach. The proposed model was shown to fit the observed data better than the excess shear model.