WorldCat Identities

Abril, Gwenaël

Overview
Works: 26 works in 30 publications in 2 languages and 73 library holdings
Roles: Thesis advisor, Author, Opponent, Other, Contributor
Publication Timeline
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Most widely held works by Gwenaël Abril
L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 29 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
Dynamique du carbone dans les estuaires européens : processus de minéralisation et transfert continent-ocean-atmosphère by Gwenaël Abril( )

2 editions published between 1999 and 2006 in French and held by 4 WorldCat member libraries worldwide

LES TRANSFERTS DE CARBONE ENTRE LE CONTINENT, L'OCEAN ET L'ATMOSPHERE SONT ETUDIES DANS DIX ESTUAIRES EUROPEENS. UNE GRANDE PARTIE DU CARBONE ORGANIQUE (CORGA) TRANSPORTE PAR LES FLEUVES EST MINERALISEE DANS LES ESTUAIRES. CETTE MINERALISATION QUI AFFECTE PRINCIPALEMENT LA FRACTION PARTICULAIRE EST CONDITIONNEE PAR L'ORIGINE (PHYTOPLANCTON FLUVIATILE, REJETS ANTHROPIQUES, SOLS) ET LA LABILITE DE CE CORGA ET LE TEMPS DE RESIDENCE DES PARTICULES. LES PROCESSUS DE MINERALISATION SONT ETUDIES EN DETAIL DANS DEUX ESTUAIRES MACROTIDAUX. DANS LA GIRONDE (FRANCE), LES CYCLES DE DEPOT ET DE REMISE EN SUSPENSION DE CREME DE VASE, AUX ECHELLES DE TEMPS TIDALE ET LUNAIRE, SOUMETTENT LES MATIERES EN SUSPENSION A DES OSCILLATIONS OXIQUE/ANOXIQUE. LA MATIERE ORGANIQUE PARTICULAIRE EST ALORS MINERALISEE ALTERNATIVEMENT PAR LA RESPIRATION AEROBIE, LA DENITRIFICATION ET LA REDUCTION DES OXYDES METALLIQUES. DANS LA CREME DE VASE, UNE DISSOLUTION DE CARBONATE DE CALCIUM REDUIT SIGNIFICATIVEMENT LA QUANTITE DE CO 2 PRODUITE PAR LA RESPIRATION, ET LA DENITRIFICATION PRODUIT DE L'OXYDE NITREUX. DANS LA ZONE HYPOXIQUE ET TRES POLLUEE DE L'ESCAUT (BELGIQUE, PAYS-BAS), LES PROCESSUS D'AMMONIFICATION, DE NITRIFICATION ET DE DENITRIFICATION MODIFIENT LES EQUILIBRES DU SYSTEME DU CARBONE INORGANIQUE DISSOUS PAR LES ECHANGES DE PROTONS QU'ILS INDUISENT. LES FLUX DE CO 2 VERS L'ATMOSPHERE MESURES SUR LES DIX SITES PERMETTENT D'ESTIMER L'EMISSION ESTUARIENNE EUROPEENNE TOTALE A 30-60.10 6 TC.AN 1, SOIT ENTRE 5 ET 10% DES EMISSIONS INDUSTRIELLES DU CONTINENT. DU FAIT D'UNE VENTILATION PHYSIQUE DE CO 2 APPORTE PAR LES FLEUVES, L'EMISSION ESTUARIENNE DE CO 2 EXCEDE LA MINERALISATION DE CORGA. D'UN ESTUAIRE A L'AUTRE, LES COMPOSANTES DU FLUX DE CO 2 ATMOSPHERIQUE (ACTIVITE HETEROTROPHE, NITRIFICATION, DISSOLUTION DES CARBONATES ET VENTILATION PHYSIQUE), VARIENT FORTEMENT EN FONCTION DES CARACTERISTIQUES DES BASSINS VERSANTS
Emission de gaz à effet de serre (CO2,CH4) par une retenue de barrage hydroélectrique en zone tropicale (Petit-saut, Guyane française) : expérimentation et modélisation by Frédéric Guérin( Book )

2 editions published in 2006 in French and held by 3 WorldCat member libraries worldwide

The emissions of carbon dioxide (CO2) and methane (CH4) and the carbon cycle in the Petit-Saut reservoir and in the Sinnamary River (French Guiana) were studied with an aim of developing a coupled physical/biogeochemical model. The development of this model required the study of three processes controlling these emissions: (i) CO2 and CH4 production during the mineralization in anoxic condition of organic matter (OM) from soils and plants, (ii) aerobic CH4 oxidation in the water column of the lake and (iii) the processes involved in gas exchange at the air-water interface. Over 10 years, atmospheric emissions were shown to be very significant, in particular the first three years having followed the reservoir impoundment and then decreased with time. While 50% of the CO2 emissions take place at the surface of the lake, the emissions of CH4 are mainly localized downstream from the turbines. The atmospheric emissions result from the degradation of OM (soil and biomass originating from the tropical forest) flooded during impoundment and their reduction with time rises from the exhaustion of the OM stock. 10 years after impoundement, 20% of the carbon stock were mineralized and emitted to the atmosphere in the form of CO2 and of CH4. Aerobic CH4 oxidation transforms more than 95% of the CH4 diffusing upward from the hypolimnion into CO2 in the water column of the lake and 40% of the CH4 entering the river downstream of the dam. In the whole Petit Saut system, this process is responsible for the oxidation of 90% of the produced CH4 and 30% of the total CO2 emissions. The CH4 and CO2 which reach the water surface of the reservoir and of the river downstream of the dam are emitted to the atmosphere by diffusive flux. The study of this process of gas transfer to the interface air-water shows that, in tropical environment, diffusive fluxes are enhanced by the elevated temperatures and the rainy phenomena. The model is based on the hydrodynamic model SYMPHONY 2D and the biogeochemical model developed during this study starting from the kinetic data of the studied processes. The simulated vertical profiles of temperature, oxygen, CO2 and CH4 are well reproduced. This model poses the bases of an operational tool of modeling for the Petit-Saut reservoir like for other reservoirs in tropical environments
Benthic production, respiration and methane oxidation in Lobelia dortmanna lawns by Cristina Ribaudo( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Carbon dynamics and CO 2 and CH 4 outgassing in the Mekong delta by Alberto V Borges( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Hydro-ecological controls on dissolved carbon dynamics in groundwater and export to streams in a temperate pine forest by Loris Deirmendjian( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Oxygénation des eaux dans un estuaire hyperturbide (Gironde) : observations in situ, expérimentations et modélisation by Marc-Vincent Commarieu( Book )

2 editions published between 2007 and 2013 in French and held by 2 WorldCat member libraries worldwide

Le système fluvio-estuarien de la Gironde est caractérisé par des eaux fortement turbides et la présence d'un bouchon-vaseux, lieu de processus hydrosédimentaires et biogéochimiques complexes. Depuis plusieurs décennies des problèmes de sous-oxygénation locale des eaux dans la partie fluviale affectent l'estuaire. L'analyse de données d'observation in situ, ainsi que des mesures en laboratoire ont permis d'accroître nos connaissances sur la dynamique de l'oxygène au sein de la zone turbide. L'état d'oxygénation des eaux est régi par deux processus dominants qui sont la respiration bactérienne et la ré-aération par échanges gazeux au travers de l'interface eau-atmosphère. La quantification de ces processus a permis l'élaboration d'un modèle capable de quantifier et prédire l'état d'oxygénation des eaux
Export and degassing of terrestrial carbon through watercourses draining a temperate podzolized catchment by Pierre Polsenaere( )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Budget of methane emissions from soils, livestock and the river network at the regional scale of the Seine basin (France) by Josette Garnier( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil) by Luiz C Cotovicz( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Formation and volatilisation of alkyl-iodidesand -selenides in macrotidal estuaries by Emmanuel Tessier( )

1 edition published in 2002 in English and held by 2 WorldCat member libraries worldwide

Carbon leaks from flooded land: do we need to re-plumb the inland water active pipe? by Gwenaël Abril( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Particulate organic carbon in the estuarine turbidity maxima of the Gironde, Loire and Seine estuaries: origin and lability by Henri Etcheber( )

1 edition published in 2007 in English and held by 2 WorldCat member libraries worldwide

Hydrological and ecological controls on dissolved carbon concentrations in groundwater and carbon export to surface waters in a temperate pine forest watershed by Loris Deirmendjian( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

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

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Carbon dynamics in the Mekong Delta by Alberto V Borges( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Comparing the efficiency of hypoxia mitigation strategies in an urban, turbid tidal river via a coupled hydro-sedimentary-biogeochemical model by Katixa Lajaunie-Salla( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Ecologie trophique et reproduction d'une population sauvage d'huître creuse Crassostrea gigas dans un écosystème macrotidal, peu profond : cas du Bassin d'Arcachon by Sonia Gasmi( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

The ecological functioning of coastal ecosystems is subjected to the synergistic action of climate change and anthropogenic pressures. In Arcachon Bay, the reproductive cycle of the oyster Crassostrea gigas has changed in recent years (e.g. weak gametogenesis, spawning delay). This pattern seems to be associated with global changes in thermal and trophic conditions. The aim of this work was to characterize the spatio-temporal variability in the reproductive investment of oysters in Arcachon Bay. This variability has been investigated in relation to the origin, quantity and quality of the trophic resources. The results revealed important spatial gradients of variability in gonadal development and trophic signal in C. gigas, between inner parts of the bay influenced by river inputs (south-east and north-east) and the external part of the bay, which is influenced by oceanic inputs. Two hydrodynamic factors explained most of the observed variability: immersion time and oceanic water renewal. A comparison of C. gigas gametogenesis and the nutritional value of available food sources between the south-eastern and north-eastern parts of the bay revealed temporal variability in the composition of phytoplankton. This variability was associated with variability in the amounts of essential fatty acids, necessary for gametogenesis. Changes in energy reserves and gamete release cycle were synchronized with the seasonal nutrient variability. These results constitute a first approach in the development of a model predicting the evolution of the energetic needs of C. gigas under the global change in environmental conditions
Echanges de CO2 atmosphérique dans la lagune d'Arcachon et relations avec le métabolisme intertidal by Pierre Polsenaere( )

1 edition published in 2011 in French and held by 1 WorldCat member library worldwide

The coastal zone is only taken into account since recently in global carbon budgeting efforts. Although covering globally modest surface areas, carbon and nutrient fluxes in the coastal zone appear significant at the global scale. However, little is known about the CO2 behaviour in lagoons and even less in intertidal zones where exchanges with the atmosphere occur alternatively with the water and the sediment. The purposes of this work are, on one hand, to establish the carbon budget between the Arcachon lagoon, the atmosphere and the terrestrial watershed and on the other hand, to link these fluxes with the net ecosystem production (NEP) and better characterize its metabolic status along with the relevant environmental factors. For the first time, CO2 flux measurements by Eddy Correlation have been carried out at different seasons and stations in the tidal flat. In parallel, the total terrestrial carbon export from river waters has been quantified throughout a complete hydrological cycle in nine watercourses flowing into the lagoon. The total carbon export from the watershed through surface river waters is estimated at 116 t C km-2 yr-1 on which 39% is exported to the lagoon as dissolved organic carbon (DOC) owing to the predominance of podzols in the watershed. Intense organic matter mineralization in soils and groundwaters largely over-saturate river waters in CO2 on which export accounts for 21% as dissolved inorganic carbon (DIC). The mathematical “StreamCO2-DEGAS” model formulation based on water pCO2, DIC concentrations and isotopic composition measurements permits to show that 43% of the total carbon export was degassed as CO2 from the riverine surface waters to the atmosphere, lowering then this latter to 66 t C km-2 yr-1. With respect to the CO2 flux measurements in the lagoon, cospectral analysis and the well accordance of results with physical and biological controls at the tidal, diurnal and seasonal time scales permit to validate the Eddy Correlation technique over tidal coastal zone. CO2 fluxes with the atmosphere, during each period, were generally weak and ranged between -13 and 19 µmol m-2 s-1. Low tide and daytime conditions were always characterized by an uptake of atmospheric CO2. In contrast, during the immersion and during low tide at night, CO2 fluxes where either positive or negative, or close to zero, depending on the season and the site. The concomitant analysis of CO2 fluxes with satellite images of the lagoon at low tide during the day clearly discriminate the relative importance of the two distinct metabolic carbon cycling involving the main primary producers, i.e. (1) the Zostera noltii seagrass meadow predominance on the NEP in autumn and summer in the more central station, with an annual cycling and (2) the microphytobenthos community predominance on the gross primary production (GPP) in spring at the same station and in autumn in the inner part of the bay where a rapid carbon cycling during the immersion and the emersion was clearly highlighted. The different results obtained with the Eddy Correlation technique over tidal flats opens interesting perspectives on the knowledge of the carbon budget and the biogeochemical and ecological processes within the coastal zone
Caractérisation et rôle respectif des apports organiques amont et locaux sur l'oxygénation des eaux de la Garonne estuarienne by Aurélie Lanoux( )

1 edition published in 2013 in French and held by 1 WorldCat member library worldwide

The Gironde Estuary is the largest macrotidal estuary in Western Europa, formed by the Garonne River (where the urban area of Bordeaux is located) and the Dordogne River. One of its main characteristics is the presence of a Turbidity Maximum Zone (TMZ) where heterotrophic processes (organic matter decomposition) are favored and where low penetration of light limits autotrophic processes (photosynthetic activity). Low dissolved oxygen (DO) that could impact aquatic biota occurred exclusively in the fluvial, low salinity and high turbidity sections of the estuary. These environmental concerns have led to study in detail in this work factors that cause estuarine hypoxia. First, I have estimated organic matter and ammonium fluxes from urban inputs in separate and combined sewer network of the Urban Community of Bordeaux, its wastewater treatment plants (WWTP) and combined sewer overflow, to compare them to the upstream watershed inputs. Even if the two WWTPs succeed in significant reduction in organic matter and ammonium contents of effluents, discharges into estuarine waters are important especially during summer, periods while storm events can generate untreated effluent inputs. This work demonstrates the high lability of this urban organic matter through incubation experiments. The dissolved organic carbon and ammonium contents in wastewater consume oxygen. Respirometry experiments allowed us to estimate higher oxygen uptake rates in wastewater than in the waters of the Gironde Estuary. Finally, the analysis of 7-yr data series from the continuous monitoring of the physico-chemical water quality (MAGEST network: MArel Gironde ESTuary) highlights periods of hypoxia in the upstream section of the estuary during pronounced low water around the Bordeaux conurbation. Statistical treatments of the 7-yr time series of DO concentration demonstrate the significant impact of the Bordeaux metropolitan area as it appears that the under-oxygenations increase during marked low water, in the presence of the TMZ, when the water temperature is high, and where the dissolved oxygen content is already low and can be quickly consumed after untreated storm water discharges. This study also shows that the nature of biological treatment used by the WWTPs and the temporary storage capacity of storm water have a critical role in the release of such compounds into the environment. This work finally provides strategies for effluent discharges to water managers, to short and medium terms, based on hydrological and physico-chemical conditions of the environment in order to limit their impact on the water oxygenation of the Garonne River
 
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English (13)

French (11)