EVALUATION OF A FUNDAMENTALLY BASED DETACHMENT MODEL

This is the second of two articles that develops and evaluates a funda mentally based detachment model. In this article, the proposed model i s evaluated by the predictive accuracy of observed incipient motion an d rill erosion data. Observed incipient motion of noncohesive particle s was used to assess the general framework of the proposed approach be cause the parameters could be estimated without calibration. A simple two-dimensional representation of particles is used to estimate erodib ility characteristics. The model accurately represented observed incip ient motion values. The model was evaluated for cohesive particles usi ng 373 rill erosion data sets of detachment and shear values. Here the parameters of the model were lumped into two parameters to allow comp arison with the widely-used excess shear detachment approach. The prop osed model was shown to fit the observed data better than the excess s hear model.