anaëlle Simonneau

Université d'Orléans | UO · Institut des Sciences de la Terre d'Orléans (ISTO)

A quantitative assessment of historical sediment yields (SY) was performed using sediment budgets from lacustrine records located in the Mont Dore and Cezallier volcanic provinces (French Massif Central). A source-to-sink approach combining hydro-acoustic images, organic geochemistry (Rock-Eval and quantitative organic petrography) and radiocarbon...

Ombrotrophic peatland-fed solely from atmospheric deposition of nutrients and precipitation-provide unique archives of atmospheric pollution and have been used to illustrate trends and changes in atmospheric trace element composition from the recent decadal to the Holocene period. With the acknowledgment of atmosphere plastic pollution, analysis of...

This study investigated the potential of sediments accumulated in sewer systems to record human activities through the occurrence of drug target residues (DTR). The installation studied is 17 m deep underground decantation tank that traps the coarse fractions of a unitary sewer system (northern part of Orléans, France), collecting both stormwater a...

Pharmaceutical products (PPs) are consumed worldwide and are continuously released into hydrological environments, but are not efficiently removed by sewage treatment plants. Their occurrence within the dissolved phase has been extensively studied, but only a few articles concern solid matrices. The mechanisms and extent of sorption depend on the p...

Le ruissellement est un phénomène épisodique et localisé, donc difficile à mesurer. Il résulte de l'interaction de nombreux facteurs, dont les caractéristiques intrinsèques et de surface du sol, la morphologie du bassin versant, mais également les caractéristiques pluviométriques. Afin d'améliorer la compréhension de la genèse et de la propagation...

The transfer and storage of chemical elements in particulate matter are controlled by physical, chemical and biological processes. Their dynamics are well understood, especially in environments that show strong tectonic and/or geomorphic pressures, and are frequently reconstructed over centuries or decades to evaluate climate change effects for exa...

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The mineral reserves of mountain environments have been exploited since the beginning of metallurgy and legacy contamination from activities such as mining persist to this day. This is particularly the case in the soils of the European mountains where potential harmful trace elements (such as Pb, Sb, As, and Hg) of anthropogenic origin have accumul...

To test the extent to which sediments accumulated in sewers may serve as high-resolution archives of urban evolution, this study examined a sedimentary succession deposited in a decantation tank of the combined sewer network of Orléans (France). The focus was on a 1.43 m sediment core drilled after 10 months of operation since the last cleaning. Se...

Long-term perspectives on climate- and human-induced shifts in plant communities and tree line in mountains are often inferred from fossil pollen records. However, various factors, such as complex patterns of orographic wind fields and abundant insect-pollinated plants in higher altitudes, make pollen-based reconstruction in mountain regions diffic...

Reconstruction of paleo-precipitation can provide an insight into past climate and precipitation. De Ploey et al. (1995) presents a highly simplified erosion equation to consider precipitation and erosion susceptibility. This empirical model allows estimation of total precipitation and erosion susceptibility across a range of catchment characterist...

In the version of this Article originally published, the following text was missing from the Acknowlegements: ‘CESBIO OHM Bernadouze weather station is supported by the Observatoire Spatial Régional (CNRS-INSU) and CNES-TOSCA funding was awarded to S. Gascoin. This scientific work was made possible with the logistical support of the ONF (French Nat...

Plastic litter is an ever-increasing global issue and one of this generation’s key environmental challenges. Microplastics have reached oceans via river transport on a global scale. With the exception of two megacities, Paris (France) and Dongguan (China), there is a lack of information on atmospheric microplastic deposition or transport. Here we...

Study of the hydro-sedimentary dynamics of lakes provides key information on hydrological changes. In this work, we investigate Lake Azigza in the Moroccan Middle Atlas, a region that suffers from a scarcity of observational hydrological data necessary for a coherent management of water resources. Sedimentary deposits of Lake Azigza (32°58′N, 5°26′...

Ce travail, effectué dans le cadre du GIS Draix "étude de l'érosion en montagne », s'est intéressé à l’érosion des "terres noires" (marnes jurassiques) du bassin de la Moyenne Durance. Il s’est traduit par une approche multi-compartiments (sols – eaux) – multi analytique (analyses optiques, géochimique), sur les bassins versants expérimentaux de Dr...

Lacustrine records have been analysed for Lake Arbu to consider if Holocene and/or Anthropocene drivers can be disentangled in describing catchment erosion fluxes and precipitation over the last century. Lake Arbu is located in a Mountain Critical Zone within the French Pyrenees and presents an ideal study site for natural and anthropic influence o...

A number of different onsets of the Anthropocene Epoch have been proposed in the literature reflecting the different disciplines and criteria regarding when human activities first began to play an important role in shaping the earth’s ecosystems. In this study we focus our research on the sedimentological and geomorphological responses of earth eco...

The occurrence of eight pharmaceutical products (PPs) from various therapeutic classes was studied in urban sediments collected upstream a small dam in Orleans, France. Since PPs are globally distributed contaminants since the 1950s, their spatial and historical distribution was documented in order to better understand the impact of recent urban ma...

The French alpine foreland area has been struck by several earthquakes with magnitudes above 5 on Richter scale in recent history. In this paper we document the regional impact of historical and Holocene earthquakes based on the identification of mass wasting deposits in glacial lakes at different settings. Lake Le Bourget and Lake Paladru are situ...

Due to its sensitivity to climate changes, south Greenland is a particularly suitable area to study past global climate changes and their influence on locale Human settlements. A paleohydrological investigation was therefore carried out on two river-fed lakes: Lake Qallimiut and Little Kangerluluup, both located close to the Labrador Sea in the his...

Au cours de la dernière quinzaine d’années, nous nous sommes attachés à ” faire parler ” les sédiments des lacs alpins afin de reconstituer les changements environnementaux qui ont ponctué le cours de l’interglaciaire dans lequel nous vivons : l’Holocène. Largement inspirés par les méthodes développées en paléocéanographie, nous avons pour cela dév...

Les milieux de montagne sont particulièrement sensibles au changement climatique, et sont largement étudiés afin de comprendre les fluctuations du climat sur des échelles de temps plus ou moins longues. Ils constituent également des espaces où se mettent en place des activités humaines diverses, qu'il est parfois difficile de qualifier et de quanti...

Environ 60 000 seuils, barrages et retenues construites par l'Homme sont au total référencés sur l'ensemble des cours d'eau de métropole. Seuls 10% des ouvrages ont un usage économique bien identifié, mais l'ensemble a provoqué une dénaturation des cours d'eau que ce soit en contexte de plaine ou en moyenne et haute montagne. En amont de leurs rete...

L'avant-pays alpin dans les environs de Chambéry a été plusieurs fois impacté par des séismes historiques de magnitudes supérieures à 5 sur l'échelle de Richter. Ce travail vise à documenter l'impact régional de séismes historiques et holocènes à partir de l'identification de glissements gravitaires dans les lacs d'origine glaciaire situés au coeur...

France L'érosion des sols est reconnue comme l'un des principaux processus à l'origine de la dégrada-tion physico-chimique des environnements aquatiques. Ce phénomène, qui a été largement décrit dans des régions montagneuses est beaucoup moins quantifié dans les régions de plaine agricole en dépit d'une connectivité optimale entre les sources de ma...

En raison de sa proximité avec la calotte glaciaire et les courants Nord-Atlantique, le sud du Groenland est une zone clef pour l'étude des variations climatiques. Les données de nombreuses séquences glaciaires et marines sont aujourd'hui disponibles mais encore peu d'études à haute résolution sur les archives lacustres sont recensées dans cette zo...

La prise de conscience de l’impact des activités humaines sur le système Terre soulève des questions globales sur la durabilité des ressources naturelles et la viabilité de notre habitat pour les populations futures. Elle provoque également des questionnements sur l’ancienneté de cette anthropisation et les modalités de sa progression dans le temps...

Les sédiments naturels récents ont toujours attisé la curiosité des scientifiques. Les sédiments urbains, témoins privilégiés de notre histoire récente, sont encore méconnus des sédimentologues. Pourtant ces sédiments accumulés dans les réseaux d'assainissement sont une opportunité pour mieux comprendre la dynamique de sédimentation dans ces milieu...

Depuis les années 1990, le bassin méditerranéen subit une augmentation des événements de précipitation et de sécheresse extrêmes susceptibles de s’amplifier au cours du XXIe siècle, et dont l’origine est attribuable aux activités anthropiques depuis la révolution industrielle de 1850 (IPCC, 2013). Les résultats issus des modèles climatiques régiona...

Ce poster présente l’utilisation d’un traceur pédogénétique pour reconstituer l’érosion des sols au cours de l’Holocène récent. Une étude intégrée multi-paramètres est appliquée à quatre systèmes lacustres contrastés d’Auvergne. Les résultats montrent des taux d’érosion des sols variant de 1 à 400 t/km²/an. Les différences inter-sites s’expliquent...

Changes in agricultural practices impact sediment transfer in catchments and rivers. Long term archives of sediment deposits in agricultural plains of northwestern Europe are rarely available, however, for reconstructing and quantifying erosion and sedimentation rates for the second half of the 20th century. In this context, a multi-parameter analy...

The French alpine foreland area has been struck by several earthquakes with magnitudes above 5 on Richter scale in recent history. In this paper we document the regional impact of historical and Holocene earthquakes based on the identification of mass wasting deposits in glacial lakes at different settings. Lake Le Bourget and Lake Paladru are situ...

The origin of both extreme flood events in Lake Ledro (southern Italian Alps) and coarse sandy layers in two disconnected lakes from the Bassies valley (Lakes Majeur and Sigriou, northern Pyrenees) have been related to the impact of snowmelt processes enhancing erosion of mountainous drainage basins (1, 2) throughout the Holocene. Because of increa...

Water budget is one of the main challenges to paleoclimate researchers in relation to present-day global warming and its consequences for human societies. Associated soil degradation and erosion are thereby becoming a major concern in many parts of the world and more particularly in the Alps. Moreover, humans are considered as geomorphologic agents...

Water budget is one of the main challenges to paleoclimate researchers in relation to present-day global warming and its consequences for human societies. Associated soil degradation and erosion are thereby becoming a major concern in many parts of the world and more particularly in the Alps. Moreover, humans are considered as geomorphologic agents...

The Research program Pygmalion consisted in 4-years long unprecedented scientific effort to investigate complex human-climate-environment interactions in Northern French Alps. Thanks to a wide geographic cover, it led to evidencing an erosion anomaly at the time of the Allobroges Gallic tribe just prior and after their embedment into the Roman Empi...

On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north– south transect, data collected in the central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and tempor...

Knowledge of past natural flood variability and controlling climate factors is of high value, since it supports and refines projections of the future flood behavior under climate warming. In this context, we present a seasonally resolved 2000-year long flood-frequency and -intensity reconstruction from the southern Alpine slope (N-Italy) using annu...

High-resolution seismic profiling has been combined with geochemical analyses of both watershed samples and five lacustrine cores retrieved from two natural lacustrine basins of glacial origin: Lakes Majeur and Sigriou (1630 m a.s.l. and 1995 m a.s.l. respectively, Eastern French Pyrenees). Identifying specific minerogenic and organic markers of au...

Two lacustrine sediment cores from Lake Ledro in northern Italy were studied to produce chronologies of flood events for the past 10 000 yr. For this purpose, we have developed an automatic method that objectively identifies the sedimentary imprint of river floods in the downstream lake basin. The method was based on colour data extracted from proc...

Two lacustrine sediment cores from Lake Ledro in northern Italy were studied to produce chronologies of flood events for the past 10 000 yr. For this purpose, we have developed an automatic method that objectively identifies the sedimentary imprint of river floods in the downstream lake basin. The method was based on colour data extracted from proc...

On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north–south transect, data collected in the Central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and tempora...

High-resolution seismic profiles and sediment cores from Lake Ledro combined with soil and river-bed samples from the lake’s catchment area are used to assess the recurrence of natural hazards (earthquakes and flood events) in the southern Italian Alps during the Holocene. Two well-developed deltas and a flat central basin are identified on seismic...

Knowledge of past natural flood variability and controlling climate factors is of high value since it can be useful to refine projections of the future flood behavior under climate warming. In this context, we present a seasonally resolved 2000 year long flood frequency and intensity reconstruction from the southern Alpine slope (North Italy) using...