Caracterização morfométrica da bacia hidrográfica do Córrego do Marinheiro, Sete Lagoas - MG

Abstract

This work aimed to make the morphometric characterization of the Marinheiro Creek watershed, SeteLagoas (Brazil), using geoprocessing tools, to aid the hydroenvironmentalanalysis. The method was performed in three steps: pre-processing; hydrologic outlining, calculation of the morphometric parameters for the watershed. The calculated hydrographic density was 2.7 un.km-2, i.e., there are 2.7 channels per square kilometer. The average slope for the watershed was 13%, which is accordingly to the sloppy topography. The watershed was at 3rdorder class, with dendritic type drainage. The sinuosity index was 20.6%, indicating a straight river. The channel slope values were S1=0.03 m.m-1; S2 = 0.008 m.m-1and S3 = 0.011 m.m-1. According to the Kc (compacity coefficient), Kf (factor), Re (elongation ratio) and IC (circularity index), the watershed is not prone to flooding, under normal precipitation conditions, due to its elongated shape. In order to improve characterization of drainage lines indicated by the DEM, additional detailed work is recommended, including field sampling and monitoring, to make difference between perennial, intermittent and ephemeral rivers and dry ravines.