HIERARCHY BETWEEN THE MAMURU AND UAICURAPÁ RIVERS, IN THE AMAZONAS RIVER HYDROGRAPHIC BASIN (BRAZIL)

Abstract

The hierarchy of river drainages helps morphometric studies of watershed and allows the knowledge of the structures of orders of river drainages. This process automated by Geoprocessing software, allows the rapid classification of river hierarchies and helps in the correct definition of toponyms. This work aimed to analyze the hierarchy of the Mamuru and Uaicurapá rivers, on the border of the Braszilian states, Amazonas and Pará, through the Strahler channel hierarchy methods, river length and definition of the contribution area. As a result, the Mamuru River was classified as a main river of 8th order and an estimated length of 253.8 km and the Uaicurapá River as a 7th order tributary river with a length of 84.9 km. Mamuru estimated at 9.943 km2 and Uaicurapá with 1.760 km2. These characteristics, together with the socio-environmental diagnoses, support environmental management and, in particular, the management of water resources, in an Amazonian context where there are gaps in surveys compatible with sub-basins and hydrographic micro-basins.