An experimental study on dredge spoil of estuarine sediments in the bay of seine (France): A morphosedimentary assessment

Marmin, Stella; Lesueur, Patrick; Dauvin, Jean Claude; Samson, Sandrine; Tournier, Patrice; Lavanne, Albert Gallicher; Dubrulle-Brunaud, Carole; Thouroude, Coralie

doi:10.1016/j.csr.2016.01.010

Cited by 26 publications

(20 citation statements)

References 30 publications

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“…Harbours need carry out periodically dredging to maintain sufficient water depth in the basins and access channels for the purpose of navigation and port activities. The dredged sediment can be deposited onshore or, in cases where they do not contain hazardous products, can be dumped at sea (Marmin et al, 2014(Marmin et al, , 2016. Nevertheless, marine dumped sediment may have different physical and chemical characteristics, which then generate multiple effects on the physical environment: input of fine particles, decreasing water depth and modification of bottom sediment (Chauvin et al, 1986;Boutin, 2000;Smith and Rule, 2001;Marmin et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Sediment dynamic equilibrium, a key for assessing a coastal anthropogenic disturbance using geochemical tracers: Application to the eastern part of the Bay of Seine

Baux

Murat

Faivre

et al. 2019

Continental Shelf Research

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Geochemical studies are becoming more and more frequent in the context of the increasing pressure of human activities on marine coastal ecosystems and represent an appropriate tool to assess anthropogenic disturbances. Moreover, it is difficult to find discriminant markers. The eastern part of the Bay of Seine (English Channel) is highly impacted by the presence of harbour activities, fishing and sediment extraction. Dredged sediment from the Grand Port Maritime du Havre (GPMH) are deposited at the subtidal Octeville site, in the north-eastern part of the mouth of the Seine estuary (mixed sediment area). To understand natural and anthropogenic sedimentary mechanisms in this area, a geochemical and sedimentological study was conducted at the beginning of 2016. A dense sampling campaign including 179 stations was carried out between Cap de La Hève and Cap d'Antifer. For comparison, sampling was carried out in the harbour (13 samples in basins strongly or very weakly dredged), in the dredged grab itself and in the Seine estuary sediment (one station in the brackish zone and two stations in the river freshwater zone). Elemental compositions were determined by X-Ray Fluorescence spectrometry and infrared spectrometry. Using PCA (Principal Component Analysis), seven constituents were selected (Si, As, S, Pb, Rb, organic Br and TOC) to determine the area influenced by dumped spoil and the sediment transport directions. Sediment areas in dynamic equilibrium display a TOC gradient perpendicular to the coastline, linked to granulometric variations due to a combination of the swell and tidal currents. In the study area, dredged sediment are finer grained and have undergone changes due to the influence of diagenetic processes characteristic of the harbour environment. As a result, these sediment are enriched in sulphides, Pb, TOC and Rb, which allows us to highlight the in-situ deposited sediment spoil. Dumped sediment and the area subject to their influence are clearly identified since they locally disrupt the natural dynamic equilibrium state.

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Section: Introductionmentioning

confidence: 99%

Sediment dynamic equilibrium, a key for assessing a coastal anthropogenic disturbance using geochemical tracers: Application to the eastern part of the Bay of Seine

Baux

Murat

Faivre

et al. 2019

Continental Shelf Research

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“…The chosen Machu experimental disposal site is located in the eastern part of the Bay of Seine (Fig. 1) at a mean water depth of ~ 20-25 m. Two million cubic metres of dredged sediment coming from the maintenance of the navigation channel of the Seine estuary were dumped on the experimental disposal area in 2012-2013 (Marmin et al, 2016). The first million cubic metres were deposited between May 13 th 2012 and December 15 th 2012 on the MASED site (Fig.…”

Section: Study Areamentioning

confidence: 99%

“…Its access is ensured by regular maintenance and permanent dredging of the navigation channel, mainly in the lower part of the Seine estuary between the Normandy Bridge and the open sea. Each year, the GPMR dredges between 4 and 4.5 million cubic meters of sediment, which is dumped on the disposal site called Kannik commissioned in 1977 in the Northern Channel of the Seine estuary (Marmin et al, 2014(Marmin et al, , 2016 (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…The SCSE studies led to validation of the Machu site, composed of fine to medium sand located in the eastern part of the Bay of Seine (Marmin, 2013;Marmin et al, 2014Marmin et al, , 2016 (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…1). In 2012-2013, experimental dumping operations were carried out to better understand the impacts of the deposition of sediments from the navigation channel onto the morphosedimentary seabed and benthic habitats of the Machu site using a Before-After-Control Impact approach (Marmin, 2013;Marmin et al, 2014Marmin et al, , 2016.…”

Section: Introductionmentioning

confidence: 99%

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Before-After analysis of the trophic network of an experimental dumping site in the eastern part of the Bay of Seine (English Channel)

Pezy

Raoux

Marmin

et al. 2017

Marine Pollution Bulletin

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An experimental study was conducted to assess the physical and biological impacts of muddy fine sand dredged material dumped on a medium sand site Machu offshore the Seine Estuary. Complementary trophic web modelling tools were applied to the Machu ecosystem to analyse the effects of dumping operations. Results show that, after the dumping operations, the biomass of fish increased while invertebrate biomass remained relatively stable through time. Nevertheless, the biomasses of benthic invertebrates, omnivores/scavengers and predators showed some increases, while non-selective deposit feeders and filter feeders decreased. At the ecosystem level, results show that the total ecosystem activity, the ascendency and the overall omnivorous character of the food-web structure increased after dumping operations, whereas recycling subsequently decreased. Finally, the fine and medium sand habitat offshore from the Seine estuary, which undergoes regular natural physical perturbations, shows a high resilience after a short dumping phase.

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The Bay of Seine: A Resilient Socio-Eco-System Under Cumulative Pressures

Dauvin

Raoux

Pezy

et al. 2020

Evolution of Marine Coastal Ecosystems Under the Pressure of Global Changes

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An experimental study on dredge spoil of estuarine sediments in the bay of seine (France): A morphosedimentary assessment

Cited by 26 publications

References 30 publications

Sediment dynamic equilibrium, a key for assessing a coastal anthropogenic disturbance using geochemical tracers: Application to the eastern part of the Bay of Seine

Sediment dynamic equilibrium, a key for assessing a coastal anthropogenic disturbance using geochemical tracers: Application to the eastern part of the Bay of Seine

Before-After analysis of the trophic network of an experimental dumping site in the eastern part of the Bay of Seine (English Channel)

The Bay of Seine: A Resilient Socio-Eco-System Under Cumulative Pressures

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