Abstract
The Inner Depression (Central Pyrenees) presents a great heterogeneity of land uses and vegetation covers. In this context, a hundred of badlands areas are distributed along the ranges of the Depression. This morphologies occurrence has been associated to the combination of different factors: bedrock, climate, deforestation, slope terracing and field crop abandonment. In this way, most of the hydrological basins show a mosaic of contrasted environments: badlands, meadows, meadows with shrubs and reforested slopes. This study presents the analyses of the hydrological response on the Araguas catchment, which is monitored for recording discharges from the most extreme environments: badlands and reforested slopes. The results show great differences on discharge generation, both by runoff generation processes and by its frequency and water volume. Reforested environments decreases flooding and erosion risks, but also generate a big reduction of water resources disposability.
Highlights
RESUMEN.– La Depresión Interior Altoaragonesa (Pirineo Central) presenta una gran heterogeneidad de usos del suelo y cubiertas vegetales
A hundred of badlands areas are distributed along the ranges of the Depression
This morphologies occurrence has been associated to the combination of different factors: bedrock, climate, deforestation, slope terracing and field crop abandonment
Summary
Desde los años 50, el interés por las cuencas experimentales ha aumentado y hoy en día es un instrumento indispensable para los estudios hidrogeomorfológicos, así como en el estudio y la gestión del medio natural. Las cuencas experimentales permiten valorar los efectos de distintas cubiertas vegetales, y la relación entre las entradas y salidas (HIBBERT, 1967; BOSH & HEWLETT, 1982; GARCÍA-RUIZ & GALLART, 1997). Para la realización de este trabajo, en junio de 2007 se instaló, en el lecho torrencial del límite inferior de la zona forestal, una sonda de presión, que proporciona registros continuos de la altura de la lámina de agua y permite estimar caudales y volúmenes de escorrentía. Principal objetivo de este trabajo es estudiar el funcionamiento hidrológico de la cuenca experimental de Araguás, definir la respuesta hidrológica frente a eventos pluviométricos de diferente intensidad, y comparar, de manera preliminar, las respuestas hidrológicas registradas en la zona forestal y a la salida total de la cuenca. El análisis de cuatro crecidas “tipo” ocurridas en diferentes condiciones ambientales ayuda a interpretar las diferencias existentes en estos ambientes tan contrastados, evidenciando la complejidad del funcionamiento hidrológico en la cuenca de Araguás
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