Comparação de estudos morfométricos da sub-bacia hidrográfica Mumbaba - PB, com dados de cartas topográficas e sensoriamento remoto.

Abstract

The morphometric study of a watershed analyzes the main factors of its consumption, among them the factors of form, relief, slope and hydrography, being the foundation for the planning and territorial of the basin, since it indicates areas with greater fragility environmental protection. This work aimed to perform a morphometric characterization of the Mumbaba River Basin located on the south coast based on 1: 25,000 topographic maps and satellite images of the Shuttle Radar Topography Mission SRTM and a comparison of the results. For the study geotechnology was used as remote sensing and geoprocessing, highlighting the use of free software. Among the results obtained, it may be that its area of study includes an area of 180.54 km² in the chart and 171.1 km² in the satellite images, according to the shape factors of a column with the ability to separate the conditions normal rainfall and elongated form. As the main differences between SRTM values and images were in the slope, and in hydrography, the number of a maximum slope was 48% and the river became 4%, while in the SRTM the maximum slope was 27% and the main river was classified with order 2. The areas most vulnerable to the anomaly in the areas of high school are the springs where the largest slopes are found. The topographical chart more accurately represents the reality of the SRTM due to a scale.