High levels of water erosion in a tropical micro-watershed calculated by USLE model
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Abstract
Based on the USLE method, GIS was used to model erosion rates in the Muchacho River Microbasin (MRM). The simulation results show an average soil loss of 74.4 t/ha/year, corresponding to the "high erosion" category. The headwaters of the MRM, characterized by scattered soils, sparse vegetation, grazing, steep slopes and frequent rainfall, show medium to very high soil erosion rates (> 25 t/ha/yr). On the other hand, areas with high vegetation density, moderate slopes and low rainfall present low erosion rates (0-25 t/ha/yr) and are mainly located in the central and lower part of the watershed. The simulation results showed a distribution of the data skewed to the right (skew = 1.05), i.e. severe erosion values with higher frequency; and leptokurtic (Kurt = 3.57) with lower frequency of extreme values.
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