Management of large natural water bodies: efficiency of hydrological estimations with complementary validations. Case of daily assessments of the Gand-Lieu lake, Loire-Atlantique
Gestion des grands plans d'eau naturels : efficacité des estimations hydrologiques à validations complémentaires. Cas des bilans journaliers du lac de Grand-Lieu, Loire-Atlantique
Résumé
The hydrological study of the lake Grand-Lieu, proves the essential role played by the hydrometeorological data, mesured at least in some discarded points in study area, both for the modelling of the basin's outflows as well as for the lake water balance. The simulation of the lake inflows was validated by two different ways : a conceptual model and a descriptive synthetic model. In the present paper we are giving only the modelling results of the basin's outflows and the lake water balance simulations. This step is an unavoidable one before any objective choice of an efficient water-lake management policy.
L'exemple du Lac de Grand Lieu permet de montrer, entre autres, comment la limite implicite des outils hydrologiques, aussi performants soient ils, en matière de modélisation des apports et de bilan hydrologique, a pu être levée grâce à l'observation hydro-météorologique disponible en quelques sites particuliers.