Rainfall energy characterization in Cuyaguateje basin erosion
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Abstract
in terms of water erosion is “Cuyaguateje” river basin,
where more than 85 % of its soil shows a high erosion risk
subjected to intensive farming practices. High pluviometric
values registered together with the non-uniform topography
necessitate spatially characterised rain erosivity in this area,
as it constitutes an essential factor of soil erosion. The
objectives of this paper were: (a) to compare expressions that
predict kinetic energy from rainfall intensity in our basin of
interest, (b) to develop and validate the relationship between
cumulative rainfall and R factor from RUSLE (Revised
Universal Soil Loss Equation) (EI30), (c) to compare results
and trends between R and the Modified Fournier Index MFI,
as well as with Lal’s index AIm (EI7.5), (d) to present rainfall
erosivity maps, according to each index calculated. Data
from two pluviographic stations were used to calculate R (by
Brown and Foster’s also Kinnell’s kinetic energy equations)
and AIm, besides data from 26 pluviometric stations located
along the basin of interest. Thus, R values ranged between
8284 and 22044 MJ mm ha-1 h-1yr-1 through both kinetic
energy equations, with the highest erosivity values at the
top or mountainous part and the lowest values at the basin
bottom. Around 96 % of the basin area is affected by rainfall
with high erosive potential. Correlations between R factor
from RUSLE and the other indexes calculated (MFI and
AIm) were higher than 0,9.
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