Future intensification of summer hypoxia in the tidal Garonne River (SW France) simulated by a coupled hydro sedimentary-biogeochemical model

Environmental Science and Pollution Research International
Katixa Lajaunie-SallaGwenaël Abril

Abstract

Projections for the next 50 years predict a widespread distribution of hypoxic zones in the open and coastal ocean due to environmental and global changes. The Tidal Garonne River (SW France) has already experienced few episodic hypoxic events. However, predicted future climate and demographic changes suggest that summer hypoxia could become more severe and even permanent near the city of Bordeaux in the next few decades. A 3D model, which couples hydrodynamic, sediment transport, and biogeochemical processes, is applied to assess the impact of factors submitted to global and regional climate changes on oxygenation in the turbidity maximum zone (TMZ) of the Tidal Garonne River during low-discharge periods. The model simulates an intensification of summer hypoxia with an increase in temperature, a decrease in river flow or an increase in the local population, but not with sea level rise, which has a negligible impact on dissolved oxygen. Different scenarios were tested by combining these different factors according to the regional projections for 2050 and 2100. All the simulations showed a trend toward a spatial and temporal extension of summer hypoxia that needs to be considered by local water authorities to impose management s...Continue Reading

References

Aug 16, 2008·Science·Robert J Diaz, Rutger Rosenberg
Oct 1, 2008·Proceedings of the National Academy of Sciences of the United States of America·Raquel Vaquer-Sunyer, Carlos M Duarte
Jun 6, 2013·Environmental Science. Processes & Impacts·Aurélie LanouxGwenaël Abril
Jul 1, 2015·Environmental Science and Pollution Research International·Wenjun ZhaoYangfan Li
Sep 16, 2016·Environmental Science and Pollution Research International·Sabine SchmidtMélina Lamouroux

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Citations

Sep 29, 2020·Journal of Fish Biology·Loïc BaumannMarie-Laure Acolas
Sep 3, 2021·Global Environmental Change : Human and Policy Dimensions·B GrizzettiM Bielza
Nov 16, 2021·Environmental Monitoring and Assessment·Mrs CoffinM R van den Heuvel

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