Size of drainage area and hydrologic connectivity in the stromflow generation in Mediterranean semi-arid catchments. Carraixet catchment
DOI:
https://doi.org/10.3989/Pirineos.2010.165009Keywords:
Rainfall-runoff relationships, hydrological connectivity, drainage, contributing area, runoff generationAbstract
The rainfall-runoff conversion is analysed taking in consideration the contributing area and hydrological connectivity, factors needing better understanding. Within the same basin, the Barranc del Carraixet near Valencia, has been selected three scales of work: four experimental plots (8 x 40 m), micro-basin (17.01 ha) and small drainage basin (127.9 km2). For the analysis of runoff generation at different scales rainfall thresholds and runoff rates and thresholds were used. For hydrological connectivity, at plot level, coefficients of determination were analyzed. Inverse relationship is given between the volume of runoff and recurrence, with increasing scale. Connectivity, at plot level, is variable, increasing the R2 according the simplification of processes, when the interference of vegetation decreases, establishing better linearity between rain and surface flow.
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