Etude du régime thermique du lac de Pareloup avec le modèle EOLE

Abstract

Résumé. - Abstract. -EOLE is a hydrodynamic and thermal model (one-dimensional vertical model) which simulates the evolution in seasonal thermal stratification of a reservoir. It is an energy budget model based on representation of physical mechanisms, which takes into account the bathymetry of the reservoir, surface energy exchanges, and throughflow in the reservoir (rivers, pumping, turbining, residual Stream flow, etc.). EOLE was developed on Pareloup Lake, a hydroelectric reservoir with a long residence time (1 year), and proved to simulate the thermal dynamics very correctly over a period of 12 consecutive years. The good agreement between the calculated and measured thermal profiles indicates that the model enables very good reproduction of the thermal stratification in the reservoir, the vertical dynamics of water masses, the thermal regime of water restituted downstream, and year-to-year fluctuations over extended periods (several one-year cycles).The model was applied using the same coefficients in other studies with good results, demonstrating that the predominant hydrodynamic phenomena in this type of reservoir are well taken into account. In fact, given its representation of the processes, the model needs no calibration providing the input data are sufficiently representative of the site under study, which underscores the importance of the quality of input data.The precision of the results obtained and the relative simplicity of the EOLE representation have enabled us to use the model as a basic structure for modeling of

The Effect of Theoretical Retention Time on the Hydrodynamics of Deep River Valley Reservoirs

“…This property has been used to develop one-dimensional models of reservoir physics in which the lake is assumed to vary only in the vertical direction, as reviewed by HARLEMAN (1982), and IMBERGER and PATTERSON (1990). There are several hydrodynamic models of this type with different formulations, some of which have been extended to include biological and chemical processes (see for example MARKOFSKY and HARLEMAN, 1973;IMBERGER et al, 1978;SENGUPTA et al, 1981;STEFAN et al, 1982;HENDERSON-SELLERS, 1987;HONDZO and STEFAN, 1993;SALENÇON, 1994;VIRTANEN et al, 1994;HAMILTON and SCHLADOW, 1997;SCHLADOW and HAMILTON, 1997). The conditions under which the one-dimensional assumption is valid are given in ORLOB and SELNA (1970), PATTERSON et al (1984), andIMBERGER andPATTERSON (1990).…”

Démarche de modélisation d'un écosystème lacustre : application au Lac de Pareloup

“…(Salençon, 1994). 11 permet de représenter plus finement la dynamique verticale et de tester les différents modes de gestion de la retenue.…”

“…Nous nous limiterons à exposer ici la démarche suivie lors de l'étude du lac de Pareloup, les résultats obtenus étant présentés de façon plus complète par Salençon (1994) et Salençon et Thébault (1 994). L'objectif de ce travail a été l'élaboration d'un modèle de simulation de la qualité physique, chimique et biologique de l'eau, permettant de représenter I'évo-lution de l'écosystème en fonction de la gestion hydraulique et des conditions météorologiques.…”