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CÁLCULO AUTOMÁTICO DO FATOR TOPOGRÁFICO (LS) DA EUPS, NA BACIA DO RIO PARACATU AUTOMATIC CALCULATION OF THE TOPOGRAPHIC FACTOR (LS) OF THE USLE, IN THE PARACATU RIVER BASIN

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Author(s): Valtercides Cavalcante da Silva

Journal: Pesquisa Agropecuária Tropical
ISSN 1983-4063

Volume: 33;
Issue: 1;
Start page: 29;
Date: 2007;
Original page

ABSTRACT
Embora a equação universal de perda de solo (EUPS) seja amplamente utilizada na predição de perda de solo, é difícil obter certos fatores dessa equação em bacias hidrográficas, como é o caso do fator de comprimento de vertente (fator L). Diante disso, este trabalho objetivou determinar de maneira informatizada (automática), o fator topográfico (LS) da EUPS, utilizando para o cálculo do fator L o algoritmo de Desmet & Govers (1996), com o suporte de um Sistema de Informações Geográficas (SIG). Verificou-se a viabilidade do cálculo do fator de comprimento de vertente, na escala de 1:100.000, por meio da metodologia desses autores, que considera o fluxo acumulado. Although the Universal Soil Loss Equation (USLE) is widely used all over the world in the prediction of soil loss, a few factors of the equation are difficult to obtain, such as the slope length factor (L factor), particularly in watersheds. For this reason, the purpose of the present research was to apply the methodology for automatic calculation of the topographic factor (LS factor) using the algorithm developed by Desmet and Govers (1996) which defines the slope length factor (L factor) through the Geographic Information System (GIS). It was verified that the slope length factor (L), as developed by Desmet and Govers (1996), which accounts for accumulated flow, showed feasible results. KEY-WORDS: USLE; L factor; topographic factor; GIS.
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