Comptes Rendus Géoscience

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Sophie Violette

Pierre-Yves Collin

Vincent Lagneau

Fabien Aubertin

Yasin Makhloufi

Rémi Charton

Françoise Bergerat

Handled by Sylvie Bourquin

Reactive transport modelling of carbonate cementation in a deep saline aquifer, the Middle Jurassic Oolithe Blanche Formation, Paris Basin, France

Benjamin Corre

Yves Lagabrielle

Pierre Labaume

Serge Fourcade

Camille Clerc

Michel Ballèvre

Handled by Marguerite Godard

Deformation associated with mantle exhumation in a distal, hot passive margin environment: New constraints from the Saraillé Massif (Chaînons Béarnais, North-Pyrenean Zone)

Hugues Bauer

Paul Bessin

Pierre Saint-Marc

Jean-Jacques Châteauneuf

Chantal Bourdillon

Robert Wyns

François Guillocheau

The Cenozoic history of the Armorican Massif: New insights from the deep CDB1 borehole (Rennes Basin, France)

Brigitte Van Vliet-Lanoë

Jérôme Goslin

Alain Hénaff

Bernard Hallégouët

Christophe Delacourt

Erwan Le Cornec

Murielle Meurisse-Fort

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C. R. Geoscience 348 (2016) 409–410
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astal sediment dynamics: Introduction to the thematic issue
This thematic issue of Comptes rendus Geoscience gives
overview of the works presented in the frame of a
sion dedicated to ‘‘Coastal sediment dynamics’’ at the
h Congress of the French Association of Sedimentolo-
s, held in Paris, France, from 5 to 7 November 2013. In
l, 23 papers were presented in this session, both in the
 of oral communications and posters. This national
ference is traditionally a gateway for PhD and Master
dents to share their first results and sharpen their oral
ls in front of an audience of specialists.
The diversity of papers presented in this session reflects
 natural diversity of the French coasts that open on the
lish Channel, the Atlantic Ocean and the Mediterranean
, both in terms of morphology (sedimentary and
eous rocky coasts, sandy beaches and subtidal prisms,
s and estuaries) and hydrodynamic processes (wave
sus tide-dominated environments).
The main scientific issues addressed in the communi-
ions focused on:
nderstanding the evolution of constructional and
rosional coasts at both long (Neogene to Quaternary)
nd short-terms (Holocene) through the stratigraphic
rchitecture of sedimentary systems and remnant
orphology of rocky platforms;
fining our vision of modern coastal systems in terms of
dimentary facies and heterogeneity, geomorphology
nd hydrodynamic processes, in order to better constrain
e interpretation of fossil systems;
uantifying sedimentary fluxes and relating hydrody-
amic processes to morphodynamics of sedimentary
odies in tide-dominated environments (estuaries and
dal channels, subtidal platforms);
arning from natural hazards (tsunamis, tidal flooding
nd storms) by studying the record of extreme events in
e sediment archive, and anticipating future evolutions
 the scope of climate change and rising sea-level
rough refined numerical models of sediment transport
nd morphodynamic evolution;
onitoring and anticipating the changes in sediment
atterns and transport due to human activities
(sediment dredging, installation of marine renewable
energy facilities. . .).
The different studies presented gave an interesting
outlook on the variety of tools deployed by the community
of coastal sedimentologists, and raised a number of
questions on the sensitivity, calibration and limits of use
of the measurement systems. Subtidal morphologies are
generally investigated using multi-swath bathymetry and
side-scan sonar, sometimes on vessels specially designed
for shallow water; intertidal and subtidal environments
are surveyed using air-borne and terrestrial laser scanner,
or by man-made surveys using differential GPS (beach
profiles). Hydrodynamics and sediment fluxes are quanti-
fied using optic (OBS) and acoustic (ADV, ADCP) probes.
While a very high-resolution seismic has proven its
efficiency to investigate the stratigraphy of subtidal bodies
and sediment infilling of bays and estuaries, ground-
penetrating radar is becoming increasingly popular in the
community to characterize the architecture of dunes and
beach ridges. Finally, original tools such as magnetic
susceptibility and X-ray microtomography enrich the
classical package of sedimentological lab analyses.
Six papers were selected for this thematic issue, which
illustrate the diversity of methods and objects embraced
by the community of sedimentologists working on coastal
environments.
Sandy beaches are subject to erosion, especially during
winter storms, and the French coasts are globally
retreating under the action of rising sea-level. Due to this
loss of recreational areas and to the damages on
infrastructures on the seaside, engineering solutions are
sometimes required to fight against erosion. Bain et al.
(2016) report a 5-year monitoring of a sandy beach in
northern France following the installation of a beach
drainage system. This soft engineering solution lowers the
beach watertable, and reduces the erosive potential of the
backwash. The survey reveals a landward displacement of
the sediment stock and a stabilization of the beach profile,
although the system is vulnerable to damages by strong
winter storms.
Contents lists available at ScienceDirect
Comptes Rendus Geoscience
ww w.s c ien c edi r ec t . c om
://dx.doi.org/10.1016/j.crte.2016.05.0011-0713/ 2016 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Foreword / C. R. Geoscience 348 (2016) 409–410410Duperret et al. (2016) present a new dataset of high-
resolution shallow-water bathymetry coupled with aerial
lidar topography. The digital elevation models of land–sea
transition zones offer a unique opportunity to study the
development of rocky shore platforms. A comparison
between a chalky coast along the English Channel and a
granitic coast in Brittany highlights the role of lithology
and of the tectonic heritage as control factors of shore
platform development in response to past sea-level
fluctuations.
Quantifying sediment fluxes is essential to understand
long-term evolution and infilling of estuaries. However,
measuring suspended sediment concentration in highly
turbid and turbulent flow is not straightforward. Furgerot
et al. (2016) address this issue by performing a detailed
comparison of suspended sediment concentration values
during the passage of a tidal bore using: (i) in-situ
sampling, (ii) optical back-scatter sensor measurements.
The quantification of the tidal bore hydrodynamics
performed with ADV and ADCP measurements, coupled
with turbidity measurements, allowed them to calculate
instantaneous vertical sediment concentration profiles
during the passage of a tidal bore, which plays a significant
role in resuspended sediments from the channel bed.
Lesourd et al. (2016) present a new map of superficial
sediments in and around the mouth of the Seine estuary,
based on an interpolation of 561 grab samples. The
comparison of these data with four other superficial
sediment maps gives an overview of the sedimentary
evolution of the Seine estuary since the late 19th century.
The observations reveal an increasing content of muddy
sediment in the mouth of the estuary. Although in a mega-
tidal context, the man-induced alteration of the estuary by
engineering works for navigation has transformed the
estuary from a sandy tide-dominated environment to a
muddy river-dominated system.
The silting of the Seine estuary requires a continuous
dredging of the channels to ensure a minimum water
depth for navigation. The dredged material is generally
dumped on specific sites in the bay of Seine. Nizou et al.
(2016) propose an original method to monitor the
dispersal of the dredge material. Because terrigenous
sediment contains a higher fraction of ferromagnetic
minerals than marine sediment does, magnetic suscepti-
bility analysis of grab samples is an efficient tool to map
the dispersion of dredge-dumped sediment on the sea
floor, in complement to classical grain size analysis.
Van Vliet-Lanoë et al. (2016) investigate the historical
development of coastal dunes in Brittany. Dune building is
conditioned by the sediment budget, which increased in
the Late Holocene due to the slowing down of the marine
transgression and the development of agriculture, and to
stormy conditions that are more favourable during
dominantly negative NAO periods. However, modern
conditions of rising sea-level and sediment starvation
might weaken coastal dunes that protect lowlands from
marine submersion.
Acknowledgements
We wish to thank the authors for their contributions,
and all the participants in the ‘‘Coastal sediment dynam-
ics’’ session during the conference.
We are indebted to the numerous referees for their
conscientious and constructive reviews of the manu-
scripts: Rémi Belon (BRGM, France), Benoı̂t Camenen
(IRSTEA, France), Christian Crouzet (Savoie Mont-Blanc
University, France), Daidu Fan (Tongji University China),
Christine Franke (MINES ParisTech, France), Sophie Lebot
(University of Rouen, France), Barbara Mauz (University of
Liverpool, UK), Steve Mitchell (University of Portsmouth,
UK), Christophe Morhange (Aix-Marseille University,
France), Cherith Moses (Univ. of Sussex, UK), Aldo
Sottolichio (University of Bordeaux), and Wayne Stephen-
son (University of Otago, New Zealand).
We are grateful to Sylvie Bourquin, associate editor of
Comptes rendus Geoscience, who offered us the opportunity
to publish this thematic issue, and who helped us in the
reviewing and editorial processes.
References
Bain, O., Toullec, R., Combaud, A., Villemagne, G., Barrier, P., 2016. Five
years of beach drainage survey on a macrotidal beach (Quend-Plage,
northern France). C. R. Geoscience 348, (this issue).
Duperret, A., Raimbault, C., Le Gall, B., Authemayou, C., van Vliet-Lanoë, B.,
Regard, V., Dromelet, E., Vandycke, S., 2016. High-resolution onshore–
offshore morpho-bathymetric records of modern chalk and granitic
shore platforms in NW France. C. R. Geoscience 348, (this issue).
Furgerot, L., Mouazé, D., Tessier, B., Perez, L., Haquin, S., Weill, P., Crave, A.,
2016. Sediment transport induced by tidal bores. An estimation from
suspended matter measurements in the Sée River (Mont-Saint-
Michel Bay, northwestern France). C. R. Geoscience 348, (this issue).
Lesourd, S., Lesueur, P., Fisson, C., Dauvin, J.-C., 2016. Sediment evolution
in the mouth of the Seine estuary (France): A long-term monitoring
during the last 150 years. C. R. Geoscience 348, (this issue).
Nizou, J., Demory, F., Dubrulle-Brunaud, C., 2016. Monitoring of dredged-
dumped sediment dispersal off the Bay of the Seine (northern France)
using environmental magnetism. C. R. Geoscience 348, (this issue).
Van Vliet-Lanoë, B., Goslin, J., Hénaff, A., Hallégouët, B., Delacourt, C., Le
Cornec, E., Meurisse-Fort, M., 2016. Holocene formation and evolution
of coastal dunes ridges, Brittany (France). C. R. Geoscience 348, (this
issue).
Pierre Weill*, Bernadette Tessier
Morphodynamique continentale et côtière, CNRS, Université
de Caen Normandie, 24, rue des Tilleuls, 14000 Caen, France
*Corresponding author
E-mail address: pierre.weill@unicaen.fr (P. Weill)
Available online 1 June 2016


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