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espanolEl desarrollo hidroenergetico genera modificaciones a los patrones hidrologicos en rios, alterando los ecosistemas acuaticos y el desarrollo de actividades que regularmente ahi se desarrollan. Para evitar alteraciones sobre estos, resulta necesario mantener un caudal minimo (caudal ecologico), sin embargo, ademas es necesario minimizar los efectos en el funcionamiento natural del rio, sus servicios eco-sistemicos y las actividades que ahi se practican. Sobre esta base se define el caudal ambiental, el cual incorpora aspectos morfologicos y de uso antropico. En este estudio se analiza y calcula el regimen de caudal ambiental para un tramo del rio Nuble considerando aspectos como hidrologia y biota, pero tambien incluyendo en el analisis los usos antropicos que tradicionalmente se realizan (rafting y kayak). Para calcular el regimen de caudal ambiental se siguieron los lineamientos establecidos en SEA (2016). Se analizaron las componentes de ecologia (fauna) y usos antropicos (actividades recreacionales) mediante el software CASIMIR, utilizando informacion publicada en el Servicio de Evaluacion Ambiental (SEA) y obtenida de entrevistas con los usuarios del rio. Como resultado se obtuvo que siguiendo solo las recomendaciones de SEA (2016) se veran alteradas las actividades recreacionales tradicionalmente realizadas en el rio. Por otra parte, si se incluye y cuantifica la necesidad de caudales para el turismo, el caudal ambiental en verano debe ser superior al caudal estimado considerando solo regulaciones de caracter hidrologico y de funcionalidad de la fauna ictica presente en el rio. EnglishHydropower development causes modifications in hydrological patterns in rivers, altering aquatic ecosystems and the activities that are typically carried out there. To avoid direct alterations to rivers, it is necessary to maintain a minimum flow (ecological flow); however, it is also necessary to minimize effects on the natural functioning of the river, its ecosystem services and the activities that are engaged in there. The environmental flow, which incorporates morphological and human-use aspects, is defined based on this foundation. In this study, the environmental flow for a section of the Nuble River is analysed and calculated, not only considering aspects such as hydrology and biota, but also including human activities that have traditionally taken place there (rafting and kayaking). SEA (2016) was used to calculate the environmental flow regime. Ecological and human components were analysed with CASIMIR software using information published in the SEA and obtained through interviews with river users. As a result, it was found that by following only the recommendations of SEA (2016), activities traditionally carried out in the river (tourism) will be altered. In addition, if the need for flows for tourism is included and quantified, the environmental flow should be greater than the flow estimated considering only regulations regarding hydrology and the functioning of the ichthyofauna present in the river.

Determinación de un régimen de caudal ambiental para el río Ñuble considerando actividades recreacionales y requerimientos de hábitat de peces