Influência da resolução do MDE na caracterização morfométrica de bacia hidrográfica
DOI:
https://doi.org/10.5752/P.2318-2962.2019v29n59p1029Keywords:
Geoprocessamento, MDE ALOS, Bioma Cerrado, Rio da PrataAbstract
This paperwork aimed to analyse the influence of the spatial resolution of the Digital Elevation Model (DEM) on the characterisation of the Cerrado watershed from the ALOS RTC, SRTM 30m and SRTM 90m DEMs using GIS. The basin boundary and the drainage network were extracted automatically, while the linear, area and relief morphometric indexes were calculated: drainage density, surface runoff average, compactness coefficient, maintenance coefficient, hypsometric curve, topographic profile, height and slope. DEM ALOS showed better results in automatic watershed delimitation than DEM SRTM 30m and 90m. This result highlights the potential of DEM ALOS as a database for watershed characterisation and, consequently, for water resources management quickly, accurately and without cost, since this data is free. From the integrated analysis of the morphometric indices, it was concluded that the Prata River watershed is not susceptible to flooding except on occasions of exceptional rainfall that may cause flooding in the floodplains.
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