Elaboration of thematic maps of superficial roughness in flooded plains lower basin of Salado River
DOI:
https://doi.org/10.5380/bcg.v15i4.16274Keywords:
Planicie, Imagen Satelital, Rugosidad, Salado.Abstract
A methodology to transform every pixel data from satellite images into Manning’s n roughness coefficient is presented in this paper. The data were taken at the lower basin of the Salado River during winter and summer using Landsat 7 ETM satellite images and field measurements. Seven classes of interest, which correspond to
different vegetation heights and ground types, were considered. In order to transform each class into n coefficients, the respective classifications were converted into vector files of geographical coordinates and class number. The raster-to-vector conversion algorithm was used for this purpose. The Keulegan equation for hydraulically rough beds was used to determine the n coefficient.
When Summer and Winter values were compared, due to vegetation growth, the roughness coefficient showed an average increase of 45%.
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