Elaboration et validation d'un modèle simple de mélange des eaux en estuaire. Application au Bou Regreg (Côte atlantique marocaine)Elaboration and validation of a simple mixing water model for an estuary. Application to the Bou Regreg (Moroccan atlantic coast)

Free access article

Issue		Ann. Limnol. - Int. J. Lim. Volume 29, Number 2, June 1993


Page(s)		203 - 216
DOI		10.1051/limn/1993018

Annls Limnol. 29 (2) 1993 : 203-216
DOI: 10.1051/limn/1993018

Elaboration et validation d'un modèle simple de mélange des eaux en estuaire. Application au Bou Regreg (Côte atlantique marocaine)

J. Massio

Laboratoire d'Hydrobiologie, URA 695 C.N.R.S., Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex, France

Résumé
A partir de données morphologiques et de mesures de salinité, un modèle numérique de mélange des eaux dans l'estuaire du Bou Regreg a été élaboré. L'estuaire a été divisé en 23 tronçons d'un kilomètre de long pour lesquels le modèle permet de calculer l'évolution dans le temps des salinités moyennes à mi-marée. Au cours de la période étudiée, les échanges entre les 23 tronçons paraissent largement dominés par la dispersion. Le modèle reproduit correctement l'évolution de la salinité après une crue artificielle due à un lâcher de barrage mais également dans d'autres situations.

Abstract
Using morphological data and salinity measurements, a numerical model describing the mixing of water along the Bou Regreg estuary was developed. The estuary has been divided into 23 sections, each 1 km in length. The model can be used to calculate the temporal changes of the average salinity for each section at midtide. During the study period the exchanges between the 23 sections were largely governed by dispersion. The model reproduces correctly the salinity variations after a major release of fresh water from an upstream reservoir and also in other situations.

Key words: estuary -- salinity -- residual discharges -- operating models -- dispersion -- Morocco

Mots clés : estuaire -- débits résiduels -- modèle de mélange -- dispersion -- Maroc

© Gauthier-Villars 1993

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