Influence of the land cover on the runoff coef cients at Catamayo River Basin, Ecuador
Keywords:
GIS, landcover, remotesensing, runoff coefficientAbstract
Land cover is a determining factor in the hydrological balance and runoff generation. The influence of land cover change in the ave- rage runoff coefficient of the upper Catamayo River Basin of the period 1986-1999 was deter- mined by GIS and remote sensing. The metho- dology was divided into three phases: analysis of the real runoff coefficients from the basin by the ratio of precipitated and drained volume; analysis of change of vegetation cover throu- gh satellite images Landsat 5; and application of two indirect methods of generating runoff: rational curve number methods in order to de- termine which holds greater correlation with real coefficients. The data of vegetation cover and runoff coefficients were compared throu- gh geospatial models and statistical tests. The results indicate a good hydrological state of the basin with an average runoff coefficient of 0.41; vegetative cover has a change of 43.5%. The coefficients generated by the number curve method maintain 85% of correlation with real coefficients. Finally, it was possible to conclu- de that the change in vegetation cover did not significantly influence in the fluctuation of ave- rage runoff coefficient of the upper Catamayo River Basin.Metrics
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