Treatment of topographic and bathymetric data acquired at the Truc-Vert Beach during the ECORS Field Experiment
The aim of this paper is to present the topographic and bathymetric surveys acquired during the international ECORS mission (March-April 2008) at Truc Vert Beach, SW of France. Topographic surveys have been done with an accuracy of about 2.5cm in the horizontal directions and 3cm for the elevation. Using both a GPS kinematics (by foot or implemented on a quad) and a theodolite, an area extending from the dune to the nearshore region was covered. In this paper, we present the methods developed in order to merge the different dataset. The acquisition and treatment of this large dataset was made possible thanks to the coordination of a large work force available on the field comprising numerous international institutions. From this work, together with the lower sample rate topographic data gathered over the last 10 years, Truc Vert Beach is the most documented beach of the French Coast.
(Journal of Coastal Research. vol. II, n° 0749-0208, pp. 1786-1790, 01/01/2009)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LEGEM, UPVD, UPVD, SHOM, BRGM, LAB, UB, INSU - CNRS, CNRS
Very Low Frequency motions of a rip current system: observations and modeling
(Journal of Coastal Research, n° 0749-0208, 23/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, BRGM
Morphodynamic response of a meso- to macro-tidal intermediate beach based on a long-term data set
Four years of bi-monthly topographic surveys have been conducted on a 350 m stretch of the meso- to macro-tidal Truc Vert beach, France. Here we study the dynamics of both the inner bar and the upper part of the beach where a berm can develop in the presence of fair weather conditions. For the inner bar, the occurrences of the different states within the intermediate classification, following that of Wright and Short (Wright, L.D., Short, A.D. 1984. Morphodynamic variability of surf zones and beaches: a synthesis. Marine Geology 56, 93–118), are presented and compared to other sites in both micro- and meso-tidal environments. The results show a similar frequency of occurrence of the Transverse Bar and Rip (TBR) state, while the more dissipative states, Rhythmic Bar and Beach (RBB) and Longshore Bar and Trough (LBT), are less regularly observed despite the high wave energy levels. The LBT and RBB states are also observed in the presence of fair weather conditions and the TBR state can persist during very energetic events. Similar results are also observed with the upper beach dynamics. Very energetic events are not necessarily associated with erosion while and low-energy events are not necessarily accompanied by accretion. The conditions given here indicate, that berm development occurs preferentially when the beach morphology exhibits a TBR or a LTT state. Apart from the control exerted by offshore wave conditions, the beach state and berm development patterns exhibited by Truc Vert beach are also discussed within the framework of possible morphological (morphodynamic) feedback and of the influence of the meso- to macrotidal range which modulates the type, intensity and duration of the wave processes operating on the cross-shore profile.
(Geomorphology. vol. 107, n° 0169-555X, pp. 263 - 274, 23/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LPGN, UN, CNRS
The Adour-Garonne Basin : Chap 5.3
Cette monographie du Bassin hydrographique Adour-Garonne comprend une introduction sur le contexte géographique, hydrographique et sociétal du bassin in cluant de courtes signalétiques des grosses villes et de leur relation à l'hydrosystème. Le 1er chapitre décrit les principales caractéristiques des cours d'eau du bassin (longueur, aire et caractéristiques du bassin versant). Ensuite sont successivement abordés des aspects historiques de l'occupation de ces bassins ; une description biogéographique, la géologie, le climat et les usages du sol ; la géomorphologie, l'hydrologie et l'hydrochimie-biogéochimie ; la biodiversité aquatique et riparienne, avec une signalétique sur chaque grand maillon biologique concerné : végétation riparienne, Phytobenthos et phytoplancton, macrophytes aquaatiques, macro-invertébrés, poissons et oiseaux. Enfin, un chapitre fait l'état d'éléments de gestion du Bassin, sur des aspects et enjeux économiques d'une part, sur la politique de protection des zones naturelles et enfin sur lles spécificités de mise en application de la Directive Européenne sur l'Eau sur l'hydrosystème Adour-Garonne.
(pp. 182-198, 23/02/2026)
CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UR REBX, CEMAGREF, UR EPBX, CEMAGREF, INRA
Holocene productivity changes off Adélie Land (East Antarctica)
This study presents the first high-resolution multiproxy investigation of primary productivity (PP) during the Holocene from the Antarctic continental margins. Micropaleontological and geochemical data from the sediment core MD03-2601, associated to sea ice model outputs, give unprecedented insights into the biological pump of the Antarctic coastal area off Adélie Land in response to climatic changes. Plurimillennial and millennial changes of PP are observed in the study area in response to changes in nutrient availability, stratification, and growing season duration, which are linked to sea ice, upwelling, wind, and glacier dynamics. The precessional cycle seems to be responsible in the PP long-term variations, while forcing factors involved at the millennial timescale remain more enigmatic. Our results emphasize enhanced biological pump during warmer and windier Holocene phases because of a longer growing season and greater nutrient input. Antarctic coastal and continental shelf zones may therefore represent a more intense carbon sink in the future.
(Paleoceanography. vol. 24, n° 0883-8305, pp. PA3207, 23/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, VU
Last glacial fire regime variability in western France inferred from microcharcoal preserved in core MD04-2845, Bay of Biscay
High resolution multiproxy analysis (microcharcoal, pollen, organic carbon, Neogloboquadrina pachyderma (s) , ice rafted debris) of the deep-sea record MD04-2845 (Bay of Biscay) provides new insights for understanding mechanisms of fire regime variability of the last glacial period in western France. Fire regime of western France closely follows Dansgaard–Oeschger climatic variability and presents the same pattern than that of southwestern Iberia, namely low fire regime associated with open vegetation during stadials including Heinrich events, and high fire regime associated with open forest during interstadials. This supports a regional climatic control on fire regime for western Europe through fuel availability for the last glacial period. Additionally, each of Heinrich events 6, 5 and 4 is characterised by three episodes of fire regime, with a high regime bracketed by lower fire regime episodes, related to vegetational succession and complex environmental condition changes.
(Quaternary Research. vol. 71, n° 0033-5894, pp. 385-396, 23/02/2026)
PACEA, UB, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Ocean color measurements onboard a jet-ski : consistency for calval exercise of high-resolution satellite imagery?
(. vol. 7150, pp. Vol. 7150, Q1Q10, doi:10.1117/12.805382, 23/02/2026)
CRC, UB, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Use of voltametric solid-state microelectrode for studying the effect of tidal forcing on biogeochemical processes on mudflat of the arcachon bay (France)
(23/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, EDF R&D STEP, EDF R&D, EDF [E.D.F.], LPGN, UN, CNRS, LOBB, OOB, UPMC, CNRS, UPMC, INSU - CNRS, CNRS
Field observations of an evolving rip current on a meso-macrotidal well-developed inner bar and rip morphology
The Aquitanian Coast (France) is a high-energy meso-macrotidal environment exhibiting a highly variable double sandbar system. The inner and the outer bar generally exhibit a bar and rip morphology and persistent crescentic patterns, respectively. In June 2007, an intense five-day field experiment was carried out at Biscarrosse Beach. A large array of sensors was deployed on a well-developed southward-oriented bar and rip morphology. Daily topographic surveys were carried out together with video imaging to investigate beach morphodynamic evolution. During the experiment, offshore significant wave height ranged from 0.5 to 3 m, with a persistent shore-normal angle. This paper identifies two types of behavior of an observed rip current: (1) for low-energy waves, the rip current is active only between low and mid tide with maximum mean rip current velocity reaching 0.8 m/s for an offshore significant wave height (Hs) lower than 1 m; (2) for high-energy waves (Hs≈ 2.5–3 m), the rip current was active over the whole tide cycle with the presence of persistent intense offshore-directed flows between mid and high tide. For both low and high-energy waves, very low-frequency pulsations (15–30 min) of the mean currents are observed on both feeder and rip channels. A persistent slow shoreward migration of the sandbar was observed during the experiment while no significant alongshore migration of the system was measured. Onshore migration during the high-energy waves can be explained by different sediment transport processes such as flow velocity skewness, wave asymmetry or bed ventilation. High-frequency local measurements of the bed evolution show the presence of significant (in the order of 10 cm) fluctuations (in the order of 1 h). These fluctuations, observed for both low- and high-energy waves, are thought to be ripples and megaripples, respectively and may play an important but still poorly understood role in the larger scale morphodynamics. The present dataset improves the knowledge of rip dynamics as well as the morphological response of strongly alongshore non-uniform meso-macrotidal beaches.
(Continental Shelf Research. vol. 29, n° 0278-4343, pp. p. 1650-1662, 23/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, BRGM
Imprints of high-salinity water plumes originating from the Red Sea during termination II.
(Palaeogeography, Palaeoclimatology, Palaeoecology. vol. 279, n° 0031-0182, pp. 69-79, 23/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CR2P, MNHN, UPMC, CNRS, IPNO, UP11, IN2P3, CNRS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, PALEOCEAN, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA