ABSTRACT
This chapter explains the model for the evolution of regolith-mantled slopes. The first linkage to be considered in detail is that between lithology and solution rate, assuming a known subsurface flow. The simplest approach is to note that the course of soil weathering should produce consistent increases in both soil deficit and the ratio. The chapter explains the influence of soil truncation on sediment transport rates for four assumed velocity distributions with depth. The slope hydrology here is somewhat simplified, and procedures are also incorporated for slope evolution by landslides, with rates also responding to lithology. A number of provisional deductions may be made from the model simulations, and from the analyses of individual processes in sections that discussed slope profiles and soils under landsliding and under creep/solifluction and wash. In conditions where wash is important simulated slope retreat commonly consists of a steep slope at a gradient determined by sliding.
