EFFETTI DELLA PENDENZA PARCELLARE SULLA PERDITA DI SUOLO STIMATA CON LA USLE-MM

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Abstract

[automatically translated] The USLE-MM is a prediction model of soil loss in the event scale erosive which introduces the plot runoff coefficient in the set of independent variables of the USLE and allows the prediction of a soil loss per unit area does not necessarily increasing with the slope length. Such circumstance, that the USLE is not able to play, has been widely found in the literature and in the experimental Sparacia. The USLE-MM climatic factor is equal to a power of the product of the flow coefficient for the index of aggressiveness of the rain of Wischmeier and Smith (1978). The USLE-MM model was originally inferred by making use of the equations used in the RUSLE for the calculation of the factor slope length, L, and the equation of Nearing (1997) for the calculation of the slope factor of the slope, S. A possible limitation of the model derives from the inadequacy of the above equations to describe the effect of the slope and length of λ s of the lot on the soil loss . In a previous memory, with reference to the sloping land of 14.9%, assuming that the equation of Nearing accurately describes the effect of the slope on the plot of soil loss, they were determined the erodibility factor of the model, the ' b1 exponent of the climatic factor and a potential relationship for estimating the factor L specifically for use with the USLE-MM model. This survey aims to test whether the equation Nearing (1997) can be effectively used in USLEMM to estimate soil loss that occurs on land, installed in the Sparacia, with gradient of 14.9 %. The values of the slope factor of the slope of the USLE-MM are higher than those calculated using the equation Nearing (1997) and the percentage differences increase with increasing s.
Original languageItalian
Pages109-118
Number of pages10
Publication statusPublished - 2015

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