Variabilidad espacial y temporal de caudales en el área de influencia de la EPMAPS y FONAG

Abstract

This investigation uses the information of flows collected by gauging stations that are within the area of influence of the institutions of the EPMAPS and FONAG with the purpose of generating values that allow to observe alterations in the flows and later to associate the causes to multitemporal changes in the land use. The flow records of 34 hydrometric stations were analyzed, which are within the area of interest. Subsequently, the approach of the Hydrological Alteration Indicators (IHA) was applied, IHA characterize the flow variations based on a series of hydrological-statistical attributes. The results of the application of the IHA are based on variables that track the survival and reproduction of aquatic organisms, therefore, patterns of change in the IHA or sudden alterations in the IHA not only allow to observe the variations that have suffered the flows, but they are also of huge help to develop criteria for the restoration of an ecosystem. The study identified that the multitemporal changes of use land, degradation of the land and water extractions are factors that have high incidence in the alteration of flows of a basin.