Impacto de condicionantes hidrológicas na definição de traçados rodoviários : aplicação na rodovia TO-247

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2011

RESUMO

The contribution of this research is given by the design of effective impacts of highways, through the expansion of the influence areas beyond the linear tracks, adding the assessment of the environmental sensitivity of watersheds in order to optimize the layout of road projects. It was produced an orderly and systematic approach of the cause and consequence relations in the watersheds incorporating in it the TO-247 highway impacts, linking the cities of Mateiros and Lagoa do Tocantins. The watersheds in the region of the study area were classified using methodology for estimating production and transport of sediment in ArcGIS ArcInfo environment. It was applied the equation model derived from the Universal Soil Loss Equation - USLE adapted from Wischmeier and Smith (1978) and the Sediment Delivery Ratio - SDR according to what is proposed by Ferro and Minacapilli (1995). Those results allowed the classification of watersheds according to the percentage estimate of sediment load that would potentially silting up the waterways through modification of their usage by land use induced by the highway. The relevant criteria to define the highway route were divided into three: (1) environmental, (2) construction and (3) socioeconomic aspects, which have been parameterized by using Geographic Information System with algorithms in raster environment into the definition of low cost paths. The optimization of the route proposal in TO-247 suggests adding profit in orientation of decision makers, such as entering the highway in watersheds with lower levels of restriction regarding the amount of sediment, reduction of crossings on protected areas, reduction of culverts and bridges and the implementation of sections and embankments, including the possibility of improved access to interest tourist points for regional development. The incorporation of hydrological conditions through the classification of river watersheds as the production and transfer of sediments, which highlighted the main novelty, was the expansion circumscription of the influence area bounded by the environmental impacts of road projects for the limits of the watersheds, which may contribute to the planning of roads inducing development.

ASSUNTO(S)

bacias hidrográficas watershed roads rodovias rodovias : aspectos ambientais usle and sdr rodovias : aspectos econômicos ifluence area optimal paths sistemas de informacoes geograficas impacto ambiental

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