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Abstract:
SINKS OF THE OSSAU GAVE AND SOURCE OF THE NEEZ RIVER (PYRENEES) - A “Gave” is a mountain torrent in the Pyrenees. The water supply of the city of Pau is depending almost entirely on a karstic spring called “Oeil du Neez” (the Neez Eye, which means spring of the Neez). L’Oeil du Neez is the main resurgence - among several others - of water sinks in the Gave bed across the urgonian limestone ridge of Arudy. Development of this karstic system through the complex structural setting of a frontal thrust has been favoured by the geomorphic evolution of the Arudy basin, dammed to the north by a morainic loop, but also by the presence of highly suitable hydrodynamic and tectonic conditions (water head and fractures network). Water quality of the Oeil du Neez is closely depending on Gave water quality. However, the catchment area proper, of this resurgence, exerts its own chemical influence.