Avaliação do cálculo de erosividade em escala regional com o auxílio de geoprocessamento na Serra de Baturité - CE

Abstract

The process of removing a thin, uniform layer of soil, caused by diffuse stormwater runoff is called sheet erosion and is directly associated with the stability of slopes. The erosivity is a numeric index that expresses the rain ability to cause erosion in an area unprotected and its action depends on the intensity, duration and frequency of rainfall The most widely used method in the world for quantifying soil losses is the Universal Loss Equation Solo or USLE (Universal Soil Loss Equation), whose formula includes an estimate or calculate the erosivity factor, R. The USLE is used to quantify the loss of soil in small areas, consistent with agricultural use and its variation throughout the year identifies the best time to establish management practices and soil conservation. Evaluation of larger areas, the USLE allows only qualitatively evaluate the different degrees of susceptibility to erosion identified homogeneous areas and should not be used to quantify the loss of laminar erosion soils and requiring the use of geoprocessing tools, as interpolations and map algebra to complement the analysis at the regional level.