CRUZ, E. S.; http://lattes.cnpq.br/1882306828953034; CRUZ, Elton Silva.
Résumé:
The need to quantify the superficial drainage and the erosion of the soil in the water
sub-basins is evident in the planning processes and use of natural resources. The
representative basins and you try they form a fundamental paper in the understanding of the
behavior of the typical basins of an area. Researches with simulation models developed in
representative basins they are means so that your results can, a priori, to be extended for the
areas of the which these basins are representative. However, it is known that the scale of the
water basin can affect the results and the parameters of a model gauged in a basin it cannot
be applied in basins of very larger or smaller size without before evaluating the scale effect
on these parameters. For this end, a runoff-erosion model was used, distributed and guided
to event, called WEPP (Water Erosion Prediction Project) for application in the
experimental basins of Sume and of Sao Joao of Cariri. The application of the model was
made in four portions of erosion of 100 m2 , being two in Sao Joao of Cariri and two in
Sume, and Sao Joao of Cariri three microbasins and two microbasins of area Sume varying
from 0,16 to 1,63 there is, being all, equipped to measure the superficial drainage and the
erosion of the soil in the natural events of the rain. The microbasin and the portions were
deforested. The results show that the main parameters of the model WEPP, parameter
conductivity executes (Ke) of the equation of infiltration of Green and Ampt, relative
parameter to the erosion for impact of the rain drops, parameter (Ki) and the erosion
parameter in the channels (Kr) they suffer scale effect. A verification of this was made in
level of the sub-basins of BRS, and there was the confirmation of the nature of the scale
effect. The dissertation presents the details of the experimental units, of the model WEPP
and the discussion of results.
