Impact of storms and floods episodes on primary production in an exploited coastal zone (Thau lagoon, south of France): Coupled hydrodynamic-biogeochemistry modeling approach.

Yann Leredde; Rémi Caillibotte; Rémi Pagès; Ameni Gouider; Claude Estournel; Caroline Ulses; Patrick Marsaleix; Vidussi Francesca; Behzad Mostajir; Eric Fouilland; Delphine Bonnet; Christian Salles; Marie-George Tournoud; Jean Louis Perrin; Claire Rodier; Sébastien Mas

Impact of storms and floods episodes on primary production in an exploited coastal zone (Thau lagoon, south of France): Coupled hydrodynamic-biogeochemistry modeling approach.

Yann Leredde ¹ Rémi Caillibotte ¹ Rémi Pagès ^{1, 2} Ameni Gouider ¹ Claude Estournel ³ Caroline Ulses ³ Patrick Marsaleix ³ Vidussi Francesca ⁴ Behzad Mostajir ^{5, 4} Eric Fouilland ⁴ Delphine Bonnet ⁴ Christian Salles ^{6, 7} Marie-George Tournoud ^{6, 7} Jean Louis Perrin ^{6, 7} Claire Rodier ^{6, 7} Sébastien Mas ⁸

1 Géosciences Montpellier

2 MIO - Institut méditerranéen d'océanologie

3 LA - Laboratoire d'aérologie - LA

4 UMR MARBEC - MARine Biodiversity Exploitation and Conservation

5 UM - Université de Montpellier

6 HSM - Hydrosciences Montpellier

7 PUrH - Pollutions URbaines et Hydrologie

HSM - Hydrosciences Montpellier

8 OSU OREME - Observatoire de REcherche Méditerranéen de l'Environnement

Abstract : The authors collaborate within the SO RECThau (Service of Observation and Research in coastal Environment of Thau) of the OSU OREME. They find themselves here on a project of hydro-biogeochemical numerical modelling complementary of their activities of observations. Illustrated on the period of the RESTHAU campaign (November 2008), the aim is to evaluate the impact of storms and floods episodes on primary production. The coupled model Symphonie-ECO3M was implemented on a fairly original computing grid encompassing the Thau lagoon, the canals, the foreshore and open sea to the offshore zone. The hydrodynamic model is coupled to the ECO3M model based on mechanistic formulations of biological processes. The model uses 35 state variables and reproduces a complex planktonic ecosystem with several primary producers and several consumers. The biochemical cycles of the biogenic elements (C, N, P, Si) are managed by the model. Owing to field data, the November 2008 storm period was investigated. The first results show no increase in primary production during and after the storm in spite of an enrichment of the lagoon in nutrients which seems to indicate a limitation by light or temperature. The role of predation by oysters (more than 10 000 tonnes in the lagoon) is also investigated by comparing the modified model integrating this compartment with mesocosms results.

Keywords : Thau Lagoon France primary production impact of storms and floods

Type de document :

Poster

Domaine :

Planète et Univers [physics] / Sciences de la Terre / Hydrologie

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https://hal.umontpellier.fr/hal-02112257
Contributeur : Pascale Roussel <>
Soumis le : vendredi 26 avril 2019 - 15:21:50
Dernière modification le : vendredi 11 octobre 2019 - 20:22:37

Impact of storms and floods episodes on primary production in an exploited coastal zone (Thau lagoon, south of France): Coupled hydrodynamic-biogeochemistry modeling approach.

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Impact of storms and floods episodes on primary production in an exploited coastal zone (Thau lagoon, south of France): Coupled hydrodynamic-biogeochemistry modeling approach.

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