The contributions of the three-dimensional cartography for geomorphologic studies in small watersheds of the Chapada Diamantina, Brazil

Abstract

This research is mainly aimed to identify the geological and geomorphological structure of watersheds that influence some of the processes of hydrology, from a 3D model, created with tweens numerical terrain models and satellite images. The study area represented located in Northeastern Brazil, state of Bahia, municipality of Lençóis and makes reference to three watersheds. The creation of the model was based on the manipulation of altimetry data from of images orbital's interferometric the Topodata and SRTM projects, with the support of the images QuickBird, plus some field campaigns of investigation and use of the Navigation System and Global positioning (GPS-GNSS).In possession of these data ,have been applied specific techniques of remote sensing and geoprocessing in GIS with ArcGIS 10.1 software. With the use of geostatistics tools, using filters and optimal arrangement of spectral bands was possible to extract a greater number of information physical and environmental and propose a three-dimensional model that simulates the shapes of the land in a watershed. The results show that with the modeling threedimensional was possible to identify with a good accuracy level, the slope, types of topographic compartments, structural geology of faults through lineaments and deformation and the dynamics of runoff and infiltration the hydrographic system. With such a model is also evident in the intense correlation structural geology, compartments and hydrological processes.

Zoning of the use and quality of groundwater as a subsidy for the management of water resources: The case of the urban area of the municipality of Lençóis, Bahia, Northeastern Brazil

“…The climate in the urban area is of the Cwb type (tropical altitude) in the Koppen (1948) classification and presents two well-defined seasons with average annual rainfall ranging from 830 mm to 1192 mm (Silva et al, 2016). The local climatic characteristic has reflexes in the types of vegetation, being this a transition area between caatinga and cerrado (Brazilian savannah), besides containing some typical species of Atlantic Forest.…”

“…Among these instruments, geotechnologies appear as potentially useful and widely applicable, and are increasingly present in various sectors of society. To this end, there is a growing need to master the tools of geotechnology, as well as spatial analyzes that are essential to obtain solid and practical results that solve the problems that arise in space and territory (Mattos et al, 2015;Silva et al, 2016).…”