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Caractérisation hydro-sédimentaire des retenues de Cointzio et d'Umécuaro (Michoacán, Mexique) comme indicateur du fonctionnement érosif du bassin versant.

Abstract : Water supply is one of the major preoccupations of our decade. Although the problems concerning the pollution of streams and reservoirs are well known, few studies are interested in the problems of sedimentary fluxes and to its consequences on aquatic environments. In this context, we chose to be interested in the reservoirs of Cointzio and Umécuaro (Michoacán, Mexico). Located in a mountainous area, with a very different morphology but strongly subjected to the same seasonal climatic forcing (rainy season from June to November), these two reservoirs do not present the same sedimentary dynamics. A complete study of these environments needs diverse skills such as hydrology, hydrodynamics or sedimentology. Each of these disciplines approach the problem of interactions between water and sediment. That is why the choice was made to follow a systemic initiative to understand the global dynamics of this system, from catchment to the reservoir, and to the scale of the floods to pluriannual study. The hydrological analysis confirms the importance of the seasonal meteorological forcing which governs the filling of the reservoirs of Cointzio and Umécuaro. These two reservoirs show hydrological contrasted dynamics, leading to moderated rates of erosion on the watershed. The hydrodynamics analysis highlights the importance of the meteorological and hydrological forcing on the dynamics of the water column on the Cointzio reservoir. The dry season is marked by an important stratification, linked to the only radiative forcing. During the rainy season, stratification is fragilised by floods, which, by their sediment charge, flow on the reservoir bottom. These hyperpycnal flows were numerically modelised by two methods (INFLO1 and AC). Sedimentary study conclude on all informations previously obtained. Radioelemnt datations, quite as the treatment of RX image, inform us about the speeds of filling and allow us to end on the validity of the models previously used. The synthesis of all data show that since the 70s, the érosives conditions on the Cointzio catchment are relatively stable but that certain efforts remain to make to limit the effect of the sedimentary transfers (more particularly of the colloidal fraction) on Cointzio reservoir waters.
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https://tel.archives-ouvertes.fr/tel-00356281
Contributor : Anne Sophie Susperregui <>
Submitted on : Tuesday, January 27, 2009 - 10:32:05 AM
Last modification on : Thursday, November 19, 2020 - 3:54:29 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 7:36:28 PM

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Anne Sophie Susperregui. Caractérisation hydro-sédimentaire des retenues de Cointzio et d'Umécuaro (Michoacán, Mexique) comme indicateur du fonctionnement érosif du bassin versant.. Minéralogie. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00356281⟩

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