Assessing and managing the risks of hypoxia in transitional waters: a case study in the tidal Garonne River (South-West France). Schmidt, S., Bernard, C., Escalier, J., Etcheber, H., & Lamouroux, M. Environmental Science and Pollution Research, 24(4):3251–3259, February, 2017. Number: 4
Paper doi abstract bibtex The Gironde estuary (S-W France) is one of the largest European macrotidal estuaries. In the tidal Garonne River, its main tributary, episodes of low (\textless5 mg L−1) to hypoxic (\textless2 mg L−1) dissolved oxygen (DO) concentrations have been occasionally recorded close to Bordeaux, about 100 km from the mouth. Projected long-term environmental changes (increase in temperature and population, decrease in river discharge) suggest the establishment of summer chronic oxygen deficiency in the tidal Garonne River in the next decades. Assessing and managing the risk of hypoxia on such a large, hyper-turbid fluvio-estuarine system is complex, due to the different forcing factors (temperature, river discharge, turbidity, urban wastes) acting over a wide range of temporal and spatial scales. In this context, we show the interest of a real-time, high-frequency monitoring of the water quality, the MAGEST network, which continuously records since 2005 temperature, salinity, turbidity, and dissolved oxygen in surface waters in Bordeaux. Through the analysis of the 10-year DO records, we demonstrate the interest of a high-frequency, long-term database to better document DO variability and to define the controlling factors of DO concentrations. This real-time monitoring is also of great interest for the development of manager’s oriented tools and the follow-up of DO objectives in the tidal Garonne River.
@article{schmidt_assessing_2017,
title = {Assessing and managing the risks of hypoxia in transitional waters: a case study in the tidal {Garonne} {River} ({South}-{West} {France})},
volume = {24},
issn = {1614-7499},
shorttitle = {Assessing and managing the risks of hypoxia in transitional waters},
url = {https://doi.org/10.1007/s11356-016-7654-5},
doi = {10.1007/s11356-016-7654-5},
abstract = {The Gironde estuary (S-W France) is one of the largest European macrotidal estuaries. In the tidal Garonne River, its main tributary, episodes of low ({\textless}5 mg L−1) to hypoxic ({\textless}2 mg L−1) dissolved oxygen (DO) concentrations have been occasionally recorded close to Bordeaux, about 100 km from the mouth. Projected long-term environmental changes (increase in temperature and population, decrease in river discharge) suggest the establishment of summer chronic oxygen deficiency in the tidal Garonne River in the next decades. Assessing and managing the risk of hypoxia on such a large, hyper-turbid fluvio-estuarine system is complex, due to the different forcing factors (temperature, river discharge, turbidity, urban wastes) acting over a wide range of temporal and spatial scales. In this context, we show the interest of a real-time, high-frequency monitoring of the water quality, the MAGEST network, which continuously records since 2005 temperature, salinity, turbidity, and dissolved oxygen in surface waters in Bordeaux. Through the analysis of the 10-year DO records, we demonstrate the interest of a high-frequency, long-term database to better document DO variability and to define the controlling factors of DO concentrations. This real-time monitoring is also of great interest for the development of manager’s oriented tools and the follow-up of DO objectives in the tidal Garonne River.},
language = {en},
number = {4},
urldate = {2019-11-26},
journal = {Environmental Science and Pollution Research},
author = {Schmidt, Sabine and Bernard, Clément and Escalier, Jean-Michel and Etcheber, Henri and Lamouroux, Mélina},
month = feb,
year = {2017},
note = {Number: 4},
keywords = {Dissolved oxygen, Estuary, Garonne, Hypoxia, Management, Monitoring, Threshold},
pages = {3251--3259}
}
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In the tidal Garonne River, its main tributary, episodes of low (\\textless5 mg L−1) to hypoxic (\\textless2 mg L−1) dissolved oxygen (DO) concentrations have been occasionally recorded close to Bordeaux, about 100 km from the mouth. Projected long-term environmental changes (increase in temperature and population, decrease in river discharge) suggest the establishment of summer chronic oxygen deficiency in the tidal Garonne River in the next decades. Assessing and managing the risk of hypoxia on such a large, hyper-turbid fluvio-estuarine system is complex, due to the different forcing factors (temperature, river discharge, turbidity, urban wastes) acting over a wide range of temporal and spatial scales. In this context, we show the interest of a real-time, high-frequency monitoring of the water quality, the MAGEST network, which continuously records since 2005 temperature, salinity, turbidity, and dissolved oxygen in surface waters in Bordeaux. Through the analysis of the 10-year DO records, we demonstrate the interest of a high-frequency, long-term database to better document DO variability and to define the controlling factors of DO concentrations. 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