COMPORTAMENTO DE TALUDE DA MARGEM DO RIO SÃO FRANCISCO SUBMETIDO À TECNICA DE BIOENGENHARIA DE SOLOS. / BEHAVIOR OF THE SLOPE OF THE SÃO FRANCISCO RIVER SUBJECTED TO THE SOIL BIOENGINEERING TECHNIQUE.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

09/02/2012

RESUMO

The lower San Francisco river had changed their hidrossedimentological behavior by changes in river channel through the impoundment of water reservoirs for the implementation of large hydropower projects. These direct impact on the stability of river banks, demands actions to mitigate the erosion resulting from soil mass movements. Soil bioengineering, which is a correct technique from the standpoint of ecological and aesthetic, makes use of biological knowledge for slope stabilization and banks of watercourses. The objective of this study was to evaluate the behavior of slope of São Francisco river throught physical parameters and development of vetiver grass composing the technique of soil bioengineering. Before the deployment of this biotechnique undisturbed samples of soil were collected and deformed to run the auger boreholes down to the water being removed layers representing the slope. Subsequent to sampling laboratory tests were performed allowing the characterization and identification of physical and mechanical properties of the soil. The experimental site studied was located on the Sergipe side of the lower course of the São Francisco river, has vertical slope, a decrease of margin collapse mass of soil and undermining the base with no riparian vegetation. For deployment of the biotechnique, at the experimental base of the slope technique was used to vegetated riprap with live cuttings of thrush (Mimosa caesalpiniaefolia Benth) and planting of vetiver grass (Chrysopogon zizanioides L (Roberty) with different levels of phosphorus and on top of slope sediment retainers were placed Bermalonga . The soil texture of the slope is closely related to susceptibility to erosion and the mechanical behavior of the same. The performance of the ongoing struggles of the water flow at its base promotes different values of moisture in the soil causing different levels of densities that change their mechanical properties by developing a dynamic behavior in the soil. The levels of phosphorus and developmental stages morphological parameters interact in shoot dry weight, root dry weight, fresh air, fresh root, root density, density of root length, root number, external surface, shoot length, root length.

ASSUNTO(S)

erosão marginal recuperação hidroambiental biotécnica agronomia bank erosion recovery environmental biotechnique

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