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EVALUATION AND PREDICTION OF WATER EROSION IN ARID STEEPLY SLOPED AREAS IN THE CENTRALWESTERN PART OF ARGENTINA $100.00
Authors:  Alberto I. J. Vich, Adriana Mariani and Armando Pedrani
Abstract:
Water erosion, especially in wild areas, is a complex phenomenon whose magnitude
has not been properly acknowledged in Argentina. There are practically no systematic
quantitative observations, with the exception of those shown here. Measurements were
carried out west of the city of Mendoza (Argentina), at 32 52' 50" south latitude and 68
52' 00" west longitude. They were conducted in areas with poorly developed soils with
mild arid climate. Measurements of soil losses (PS) were performed during the 1982-95
period on plots with bare soil and varied exposure and slope. Application and adjustment
of the USLE as a prediction tool was examined and its components were assessed. It is
used to predict soil losses caused by individual events since erosive storms are not
frequent. Given the fact that the rainfall erodibility factor does not adequately explain soil
loss variations, different forms were proposed that combined rainfall intensity and runoff.
The remaining factors were assessed with the original methodology, and the protective
effect of rock fragments found in the soil profile and surface was included in the
coverage factor. Adjustment of the original equation and proposals was carried out
through optimization with individual data. Applicability of the USLE or modified
expressions for predicting erodibility from individual events has not proved to be
satisfactory due to the random nature of predictions. It is, therefore, essential to collect
more information. 


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EVALUATION AND PREDICTION OF WATER EROSION IN ARID STEEPLY SLOPED AREAS IN THE CENTRALWESTERN PART OF ARGENTINA