Estimation of low flows through recession analysis in different Ecuadorian basins
Abstract
With the present research, a predictive tool for low flows is obtained for tropical basins in the coastal regions and the western foothills of the Andes mountain range in Ecuador. The selected basins are those of the Junín, Paján, Cañar, Santa Rosa and Arenillas rivers, given that these sites lack macro-regulatory works that affect these flows. In the methodology used in this research, there are two previous studies that estimated these flows using the covariance analysis method, which begins by identifying the hydrological stations that provide relevant information on flow and precipitation with a period of 1990-2013. With the defined criteria and variables, a series of base flows is generated with the exponential recession equation, validating the predictive tool by applying the data for another period of time. The results show that the recession constant K varies according to the methods, in the sensitivity method K is found to be very low and in the threshold method K is found closer to 1. This defines that the threshold method is the selected one. to make comparisons and verifications if the method is applicable in the Ecuadorian basins, for Junín with a value of 0.988, Paján with a value of 0.988, Cañar with a value of 0.987, Santa Rosa with a value of 0.969 and Arenillas with a value of 0.983. In the validation of the method, results were not very satisfactory, but sufficient to determine that the method is functional for Ecuadorian basins.
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References
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