Morphometric characterization of the acará river water basin (Northeast pará) through srtm data a b s t r a c t

Abstract

Currently, the Amazon has been suffering significant impacts through human actions as rural and urban disordered occupation, agriculture, livestock and mining. In face of this situation, the Hydric Resources National Policy, instituted by law number 9,433 from January 8 of 1997, presents the spatial administration system named water basin. Through its applicability, the water basin is base to understand the dynamic of the hydrologic cycle and of impacts caused by human activities. Thus, the geotechnology use has presented as a promising alternative in environmental monitoring of water basins. This research aims to generate the morphometric characterization of the Acará River Water Basin, localized in northeast Pará, through SRTM data. Thus, was determined the shapes global index, fluvial hierarchy, hypsometry and declivity of the water basin. According to obtained results, is possible to infer that the Acará River Water Basin has an elongated form, promoting less defluvium concentration and less exposure to large-scale flooding, with 6th order of fluvial hierarchy. In relation to declivity, the basin fitted, mostly, in flat and smoothly wavy classes, with maximum altitude of 104.47 meters. Thus, the morphometric characterization of water basins, through SRTM data, presented several advantages such as processing speed, better secondary data integration, replicability and less manual intervention. Besides, the information produced can contribute with the comprehension of the environmental dynamic of the Acará River Water Basin, contributing with database for the optimization of management plans.