2.1.1. Changes in Rainfall

Certainly, rainfall regime variations directly influence soil erosion rates [32] and modify transport capacities of rivers, so much so that an increase in rainfall should result in an increase in sedimentary input and a progradation of beaches. This, in general, can be considered true, but there are certainly cases in which the increase in rainfall determines an increase in vegetation cover which, in turn, reduces erodibility of the soils and surface runoff, so much so as to lead to a reduction of river input. A similar effect is most likely in semi-arid areas [33], where soil erosion rates are high despite low rainfall [34].
