Gênese e morfologia de depósitos tecnogênicos na área urbana de Araguaína (TO)

Abstract

The changes in environmental processes results in the generation of a new geomorphological and pedological configuration consisting of materials wasted by industrial, commercial and domestic activities. Such deposits recognized as Technogenic causing innumerous social, economic, environmental problems and barriers for the urban planning. The central focus of this work in urban area of Araguaína located in the northern state of Tocantins (Brazil) lies in the improvement of the methodology of study of these artificial bodies in genesis and morphologies and in a propose of measures to mitigate the impacts and facilitate the activities of environmental planning. The methodology used was based on literature review, characterization and mapping of the study area, characterization of urban sprawl, and morphological and textural analysis of the dynamics of Technogenic Deposits. The results show great difficulty in identifying with satellite images of the DT indirectly as differentiated vegetation (exotic), emergence of new fluvial deposits, erosional features exposed by stormwater and areas with exposure of pedological layer and material handling. The DT in the city of Araguaína tends to expand its original area by entrainment of material by runoff with a layered structure and selection of tecnogenic materials in bottoms valleys. The intensity and volume of stormwater on DT added the slopes less steep causes mass movements affecting the stability of civilians building structures in several areas of the Araguaína city. Another observed fact is the amount of area with DT will become obsolete for use as public parks, green areas, as well as for the urban settlement. In this meaning, the techniques of remediation and recovery were determined according to the specific characteristics of each deposit and the environment in which it operates in the city of Araguaína.