3D hydrosedimentary models of the Loire Estuary using TELEMAC-3D-TOMAWAC and GAIA

Hydrodynamic

Evaluation of an offshore disposal site in then Loire estuary through field monitoring and 3D numerical modelling

Water Qualit

An oil spill model for inland waters applied to the “Happy Bride” accident

Water Qualit

Hydro-Sedimentological Model of Mont Saint-Michel Implementation of ARTELIA Model by CETMEF

Sediment Transpor

The ecological role of ponds in a changing world

The fifth conference of the European Pond Conservation Network (Luxembourg, June 2012) brought together researchers, environmental managers, and other stakeholders with the aim to share stateof-the-art knowledge on the ecology, management, and conservation of ponds in the context of the many challenges facing the wider water environment. Although well-known ecological patterns apply to most ponds in Europe and elsewhere, recent data highlight that part of the environmental variables governing pond biodiversity remain specific to climatic/ biogeographic regions and to elevation ranges, suggesting that, in addition to common practice, management plans should include range-specific measures. Beyond the contribution of individual ponds to the aquatic and terrestrial life, connected networks of ponds are vital in the provision of new climate space as a response to global climate change, by allowing the observed northward and/or upward movements of species. In terms of services, ponds offer sustainable solutions to key issues of water management and climate change such as nutrient retention, rainfall interception, or carbon sequestration. While the ecological role of ponds is now well established, authoritative research-based advice remains needed to inform future direction in the conservation of small water bodies and to further bridge the gap between science and practice

The ecological role of ponds in a changing world

The fifth conference of the European Pond Conservation Network (Luxembourg, June 2012) brought together researchers, environmental managers, and other stakeholders with the aim to share stateof-the-art knowledge on the ecology, management, and conservation of ponds in the context of the many challenges facing the wider water environment. Although well-known ecological patterns apply to most ponds in Europe and elsewhere, recent data highlight that part of the environmental variables governing pond biodiversity remain specific to climatic/ biogeographic regions and to elevation ranges, suggesting that, in addition to common practice, management plans should include range-specific measures. Beyond the contribution of individual ponds to the aquatic and terrestrial life, connected networks of ponds are vital in the provision of new climate space as a response to global climate change, by allowing the observed northward and/or upward movements of species. In terms of services, ponds offer sustainable solutions to key issues of water management and climate change such as nutrient retention, rainfall interception, or carbon sequestration. While the ecological role of ponds is now well established, authoritative research-based advice remains needed to inform future direction in the conservation of small water bodies and to further bridge the gap between science and practice

Projet de dépoldérisation expérimentale de la Caroline - Baie de Somme

Managed realignment pilot project at Caroline polder – Bay of Somme. The managed realignment pilot project at Caroline polder at Le Hourdel (Bay of Somme) is in line with the Programme of the Bay of Somme, started in 1997 by “Le Conseil Général de la Somme”. This project aims to limit, thanks to hydraulic flushes, silting-up in the access channels to Le Crotoy, Le Hourdel and Saint-Valéry-sur-Somme harbours. Later, it has been proposed to amend the initial project (consisting of the creation of a flushing basin) to the experimentation of a managed realignment scheme covering approximately 20 ha. Beyond the hydraulic function, the objectives of scheme take into account landscape impacts, increase of biological productivity and development of new human activities. This study has involved a complex hydro-sedimentary modelling in order to simulate morphological of the South part of the Bay of Somme, with or without development scheme. Modelling has been performed in a similar way as physical model tests that were realized for the previous scheme.Le projet de dépoldérisation expérimentale du polder de la Ferme de la Caroline au Hourdel (Baie de Somme) s’inscrit dans un programme d’aménagement de l’ensemble de la baie de Somme, qui a été lancé en 1997 par le Conseil Général de la Somme. Ce projet vise à limiter, au moyen de chasses hydrauliques, les effets de l’ensablement sur les chenaux d’accès aux ports du Crotoy, du Hourdel et de Saint-Valéry-sur-Somme. Il a ensuite été proposé d’amender le projet initial de création d’un bassin de chasse au Hourdel, par l’expérimentation d’un processus de dépoldérisation sur une surface d’environ 20 hectares. Les objectifs fixés, au-delà du seul paramètre hydraulique, prennent en compte les impacts paysagers, l’accroissement de la productivité biologique et le développement de nouvelles activités humaines. Cette étude a nécessité la mise en place d’une modélisation hydrosédimentaire complexe permettant de simuler les évolutions morphologiques dans le secteur Sud de la Baie de Somme, avec ou sans aménagement, de manière analogue aux aménagements prévus initialement (bassin de chasse) qui avaient fait l’objet dans les années 1993-1995 d’essais sur modèle physique.Ledoux Sébastien, Walther Régis, Rieu Jérôme. Projet de dépoldérisation expérimentale de la Caroline - Baie de Somme. In: 31èmes Journées de l’Hydraulique de la Société Hydrotechnique de France. Morphodynamique et gestion des sédiments dans les estuaires, les baies et les deltas. 22 et 23 SEPTEMBRE 2009. 2009

Variability of subtidal flow in a narrow meandering stratified estuary

International audienceA 3D numerical model was set up to investigate the spatial and temporal variations of subtidal circulation in a narrow meandering stratified estuary: the Adour Estuary (France). The hydrodynamic model was validated with field data and reproduced satisfactorily tide, current and salinity observations. The results highlighted a fortnightly switch in the residual flow structure and a variation in residual circulation intensity between low and high river discharge conditions. During neap tides, an exchange flow was observed as the baroclinicity dominated the residual circulation. During spring tides, the advection and barotropic pressure gradient drove the subtidal flow and an outflow over the whole water column took place. Residual flows were twice as high during high river discharge as during low river discharge. Secondary cross-channel residual circulation was driven by the estuarine morphology and the along-channel residual circulation. A secondary circulation cell was observed when a density-driven exchange flow occurred (neap tide). The meanders induced a variation of the sense of rotation of the circulation cell. A constriction of the channel has been shown to strengthen the residual circulation by flow conservation. Finally, we observed that the freshwater Froude number and the Mixing number Geyer and MacCready (2014) were able to distinguish residual flow pattern between idealised simulation cases

Light harvesting porphyrin-crown ether conjugates: toward artificial photosynthetic systems

International audienc