Revista de la Asociación Geológica Argentina
versión ISSN 0004-4822
DOFFO, Nelso C.; ERIC, Carlos F. y GONZALEZ BONORINO, Gustavo. Analysis of the geological control on the Arroyo Las Lajas, Cordoba, flashiness through an hydrological modeling. Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.1, pp. 40-46. ISSN 0004-4822.
The impact of lithological, structural and biotic factors in the hydrological response of a mountain drainage basin is analyzed using the mathematical model ARHymo. The upstream reach of the Las Lajas creek is located in the Comechingones Ranges, between 1,200 to 750 m a.s.l.; it has an area of 41 km2 and a drainage network of Horton order 6. The morphology of the basin is strongly controlled by the Las Lajas fault, a recently active structure that separates granitic from metamorphic substrates. The basin was subdivided into 42 subbasins and curve numbers were computed for each subbasin. The flashiness of the flood wave was estimated from time-to-peak data and from the shapes of hydrographs. Comparison of the shapes of the hydrographs of representative subbasins and the distribution of time-to-peak frequencies, with the geological features of the basin, suggests that the subbasins developed on metamorphic substrate show greater flashiness than those located on granitic substrate.
Palabras llave : Flood flashiness; Peak flow; Córdoba; Hydrological modeling.