La Loire, de la Maine à la mer

Observations et suivis environnementaux

Webcam : l’estuaire en direct

Débit de la Loire : 291 m/s source : https://www.vigicrues.gouv.fr/
Coefficients des marées : 70 (PM 4h38) / 70 (PM 16h52) source : https://www.shom.fr/

SHELLFISH AQUACULTURE FROM SPACE: POTENTIAL OF SENTINEL2 TO MONITOR TIDE-DRIVEN CHANGES IN TURBIDITY, CHLOROPHYLL CONCENTRATION AND OYSTER PHYSIOLOGICAL RESPONSE AT THE SCALE OF AN OYSTER FARM

Shellfish aquaculture from space: potential of Sentinel2 to monitor tide-driven changes in turbidity, chlorophyll concentration and oyster physiological response at the scale of an oyster farm Introduction Material and methods – Study site – In situ data – Bio-optical algorithms – Satellite and data processing Results – In situ reflectance spectra – In situ calibration […]

ASSESSMENT OF THE METAL CONTAMINATION EVOLUTION IN THE LOIRE ESTUARY USING CU AND ZN STABLE ISOTOPES AND GEOCHEMICAL DATA IN SEDIMENTS

(dossier articles) Assessment of the metal contamination evolution in the Loire estuary using Cu and Zn stable isotopes and geochemical data in sediments 1. Introduction 2. Methods 2.1. Study area 2.2. Sampling and sample preparation 2.3. Analytical methods 2.4. Enrichment factor 3. Results 3.1. Isotope and geochemical data of sediments 4. Discussion 4.1. Assessing temporal […]

PHARMACEUTICAL POLLUTION OF THE WORLD’S RIVERS

Pharmaceutical pollution of the world’s rivers Results and discussion – Global reach – Cumulative pharmaceutical concentrations – Pharmaceutical detection frequencies and concentrations – The socioeconomics of pharmaceutical pollution – Implications of global pharmaceutical pollution for ecological and human health – Toward 2030: the new paradigm in environmental monitoring Material and methods

POUR LE RENOUVEAU DU FLUVIAL SUR LA LOIRE

Pour le renouveau du fluvial sur la Loire 1. Un peu d’histoire 2. Les avantages du transport fluvial 3. Peut-on rendre à nouveau la Loire navigable ? 4. Est-il possible, malgré tout, de faire renaître sur la Loire un trafic fluviomaritime conséquent ? 5. Conclusion

LE PONT DE SAINT-NAZAIRE

Le pont de Saint-Nazaire 1. Le pont 1.1. Descriptif 1.2. Les difficultés pour l’entretien 2. Étude des risques 2.1. Tableau récapitulatif 2.2. Les risques aériens 2.3. Les risques maritimes 2.4. Les risques routiers 3. Étude sur la circulation 4. Recherche de solutions 4.1. Le trafic sur le pont 4.2. Le trafic maritime 5. Conclusions Annexes […]

EVOLUTION D’UNE POPULATION DE RALE DES GENETS CREX CREX DANS L’ESTUAIRE DE LA LOIRE – APPROCHE SPATIO-TEMPORELLE LIEE A L’HABITAT

(dossier articles) Évolution d’une population de râle des genêts Crex crex dans l’estuaire de la Loire – Approche spatio-temporelle liée à l’habitat Introduction Matériel et méthodes – Zone d’étude – Recensement des mâles chanteurs – Analyse spatiale de la localisation des mâles chanteurs – Étude des habitats fréquentés Résultats – Variations d’effectifs de mâles chanteurs […]

COMPARISON OF ENVIRONMENTAL FORCINGS AFFECTING TURBIDITY VARIABILITY IN TWO MACROTIDAL, HIGHLY-TURBID ESTUARIES

Comparison of environmental forcings affecting turbidity variability in two macrotidal highly-turbid estuaries 1. Introduction 2. The study sites 3. Material and methods 3.1. The monitoring systems 3.2. Data treatments: spectral analysis 4. Results 4.1. Times scales of turbidity variability 4.2. Spectral quantification of forcings contributions 5. Discussion 5.1. Multiannual influence of environmental forcings 5.2. Seasonal […]

TURBIDITY IN THE FLUVIAL GIRONDE ESTUARY BASED ON 10-YEAR CONTINUOUS MONITORING: SENSITIVITY TO HYDROLOGICAL CONDITIONS

(dossier articles) Turbidity in the fluvial Gironde estuary based on 10-year continuous monitoring: sensitivity to hydrological conditions 1. Introduction 2. The study site 3. Materials and methods 3.1. The multiyear high-frequency monitoring system 3.2. Data treatment 4. Results 4.1. Hydrological trends 4.2. Short-term variability in turbidity 4.3. Long-term variability in turbidity 5. Discussion 5.1. Mobile […]