La Loire, de la Maine à la mer

Observations et suivis environnementaux

Webcam : l’estuaire en direct

Débit de la Loire à Montjean-s/L : 122 m/s source : https://www.vigicrues.gouv.fr/
Coefficient de marée à Saint-Nazaire : 91 (PM 7h58) / 86 (PM 20h10) source : https://www.shom.fr/

Recherche Globale

THE IMPORTANCE OF SUPPRESSION OF TURBULENCE BY STRATIFICATION ON THE ESTUARINE TURBIDITY MAXIMUM

The importance of suppression of turbulence by stratification on the estuarine turbidity maximum Introduction The influence of stratification on suspended sediment flux – Equilibrium suspended sediment distributions in neutral flux – Suppression of turbulence in stratified estuaries – Settling of sediment in stratified estuaries Simulation of the turbidity maximum – Model formulation – Results of […]

NEW DIMENSIONS IN ESTUARY CLASSIFICATION

New dimensions in estuary classification Introduction Salt balance relationships Classification in terms of stratification and circulation Relationship of stratification and circulation to bulk parameters in well-mixed and partially mixed estuaries Discussion References

GRAVITATIONAL CIRCULATION IN STRAITS AND ESTUARIES

Gravitational circulation in straits and estuaries 1. Introduction 2. Formulation 3.1. The central regime; theory 3.2. The central regime; comparison with observations 4.1. The inner regime; theory 4.2. The inner regime; comparison with observations 5. Discussion 6. Conclusion References

STRATIGRAPHY OF TIDE-DOMINATED ESTUARIES

Stratigraphy of tide-dominated estuaries 1. Introduction 2. Tide- vs. Wave-dominated estuaries: a few reminders 3. Stratigraphy of tide-dominated estuary infill: case studies 3.1. Progress in the assessment of estuary stratigraphy: the use of very high-resolution seismic data 3.2. Modern estuaries with low river sediment supply 3.3. Modern estuaries with high river sediment supply 3.4. Ancient […]

TIDE-DOMINATED ESTUARIES AND TIDAL RIVERS

Tide-dominated estuaries and tidal rivers Introduction – The classification problem Physical processes in tide-dominated estuaries – Effects of tide on sediment dynamics – Formation of a tidal turbidity maximum Morphologic and sedimentologic character – Estuarine morphology – Estuarine sedimentology – Fluid-mud deposits – Estuarine infilling Holocene examples: tide-dominated estuaries – Gironde estuary – Severn estuary […]

ETUDE DE L’INTERFACE EAU-SEDIMENT DANS LES GEOSYSTEMES ESTUARIENS : APPROCHE COUPLEE BIOGEOCHIMIE ET MODELISATION PAR L’EVALUATION DES FLUX DE NUTRIMENTS

Introduction 1. Biogéochimie et hydrodynamisme d’un estuaire macrotidal : fonctionnement et méthodes d’étude 1.1. Fonctionnement d’un estuaire macrotidal 1.2. Les méthodes de modélisation et d’échantillonnage de l’interface eau-sédiment 2. Matériels et méthodes 2.1. Sites d’étude 2.2. Méthodes d’étude des vasières intertidales 2.3. Modèles numériques de diffusion et d’advection 3. Étude de l’hétérogénéité spatiale et temporelle […]