Implementation of soil bioengineering techniques for erosion control of the Lower São Francisco, Sergipe State

Abstract

The stabilization of slopes by means of simple techniques proposed promote aesthetic improvements, ecological and conservation in the production area. Bioengineering of soil, which is a correct technique from the standpoint of ecological and aesthetic, makes use of biological knowledge for slope stabilization and land banks of watercourses. The objectives were to introduce the techniques of soil bioengineering used and describe the implementation of soil bioengineering project on the waterfront in San Francisco. The experimental site studied is located on 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 biotechnologies, the experimental site was divided into two experiments in the feeling of the river upstream to downstream. In the first experiment, the base of the slope technique was used in rockfill vegetated with live cuttings of thrush and planting of vetiver grass and on top of the slope sediment retainers were placed Bermalonga ®. In the second experiment, the base of the slope technique was used enrocada wall on biodegradable blanket, with rocks interspersed with live cuttings, and on the slope, photodegradable implanted biodegradable blankets made from 100% coconut fiber, with the planting of live cuttings mastic and thrush. The combination of bioengineering techniques used in traditional engineering on the shore of San Francisco provided greater protection to the base of the slope and vegetation growth.