Abstract

There is a significant impact of anthropogenic changes in semi-arid areas on rainfall. In the Sahel, this impact is the main cause for the severity and persistence of drought. Also in other dry parts of the world this impact, which is in fact a transgression of the environmental carrying capacity, is probably felt to a measurable extent, e.g. in Southern Africa, Eastern Europe, and the Indian Subcontinent. In this paper a recently modified theory is presented on moisture recycling based on water balance computations, which is able to quantify these effects on the basis of relatively simple physical indicators. In these indicators the runoff coefficient plays a key role; the larger the runoff coefficient, the lower moisture recycling and rainfall. In addition, possible lines of action to restore moisture recycling and hence to enhance rainfall are proposed.

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