Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition
International audience Understanding the hydrodynamic behaviour of bioclastic particles is necessary to refine our interpretation of depositional environments in the fossil record and to improve predictive numerical models for coastal zone management. Many coastal sediments are partly composed of bi...
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ftnormandieuniv:oai:HAL:hal-02166657v1 2024-04-14T08:10:46+00:00 Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition Rieux, Alissia Weill, Pierre Mouazé, Dominique Tessier, Bernadette Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) Rome, Italy 2019-09-10 https://normandie-univ.hal.science/hal-02166657 en eng HAL CCSD hal-02166657 https://normandie-univ.hal.science/hal-02166657 34th IAS Meeting of Sedimentology https://normandie-univ.hal.science/hal-02166657 34th IAS Meeting of Sedimentology, Sep 2019, Rome, Italy Bioclastic sediment Settling velocity Carbonate sediment Threshold of motion Boundary layer [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/conferenceObject Conference papers 2019 ftnormandieuniv 2024-03-21T16:56:58Z International audience Understanding the hydrodynamic behaviour of bioclastic particles is necessary to refine our interpretation of depositional environments in the fossil record and to improve predictive numerical models for coastal zone management. Many coastal sediments are partly composed of biogenic particles, which shapes and densities differ strongly from classic rounded quartz grains. This results in particular hydrodynamic behaviours. Characteristics of biogenic particles can also vary significantly between species. If numerous studies have investigated the hydrodynamic behaviour of bioclastic sediments derived from reef-dwelling organisms, there is a paucity of research focusing on “cool-water carbonate” bioclastic particles (i.e. mollusc shell debris, calcareous algae,.). The aim of the present research is to characterize the influence of faunal composition on the settling velocities and the entrainment threshold of mollusc shell debris from temperate regions. Shells have been sampled in the southern coast of Mont-Saint-Michel bay (Brittany, France) which is bordered by a coarse, shelly coastal barrier, before being ground and separated into individual sieve fractions. Eight species representative of the faunal composition in the area have been studied: four wild species (Cerastoderma edule, Scrobicularia plana, Anomia ephippium, Ostrea edulis) three reared species (Crassostrea gigas, Mutilussp., Ruditapes philippinarum) and one introduced (Crepidula fornicata). Settling velocities of the eight species have been measured in a settling tube for several debris sizes. A set of experiments have been performed in a small recirculating flume. Threshold of motion of the species under unidirectional current for different grain sizes have been characterized using an Acoustic Doppler Velocimeter Profiler. Critical bed shear stress values (tau_cr) were derived from velocity profiles in the boundary layer, by a logarithmic regression of the “law of the wall”.Results show consistent interspecific differences in ... Conference Object Crassostrea gigas Normandie Université: HAL |
institution |
Open Polar |
collection |
Normandie Université: HAL |
op_collection_id |
ftnormandieuniv |
language |
English |
topic |
Bioclastic sediment Settling velocity Carbonate sediment Threshold of motion Boundary layer [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Bioclastic sediment Settling velocity Carbonate sediment Threshold of motion Boundary layer [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Rieux, Alissia Weill, Pierre Mouazé, Dominique Tessier, Bernadette Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
topic_facet |
Bioclastic sediment Settling velocity Carbonate sediment Threshold of motion Boundary layer [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Understanding the hydrodynamic behaviour of bioclastic particles is necessary to refine our interpretation of depositional environments in the fossil record and to improve predictive numerical models for coastal zone management. Many coastal sediments are partly composed of biogenic particles, which shapes and densities differ strongly from classic rounded quartz grains. This results in particular hydrodynamic behaviours. Characteristics of biogenic particles can also vary significantly between species. If numerous studies have investigated the hydrodynamic behaviour of bioclastic sediments derived from reef-dwelling organisms, there is a paucity of research focusing on “cool-water carbonate” bioclastic particles (i.e. mollusc shell debris, calcareous algae,.). The aim of the present research is to characterize the influence of faunal composition on the settling velocities and the entrainment threshold of mollusc shell debris from temperate regions. Shells have been sampled in the southern coast of Mont-Saint-Michel bay (Brittany, France) which is bordered by a coarse, shelly coastal barrier, before being ground and separated into individual sieve fractions. Eight species representative of the faunal composition in the area have been studied: four wild species (Cerastoderma edule, Scrobicularia plana, Anomia ephippium, Ostrea edulis) three reared species (Crassostrea gigas, Mutilussp., Ruditapes philippinarum) and one introduced (Crepidula fornicata). Settling velocities of the eight species have been measured in a settling tube for several debris sizes. A set of experiments have been performed in a small recirculating flume. Threshold of motion of the species under unidirectional current for different grain sizes have been characterized using an Acoustic Doppler Velocimeter Profiler. Critical bed shear stress values (tau_cr) were derived from velocity profiles in the boundary layer, by a logarithmic regression of the “law of the wall”.Results show consistent interspecific differences in ... |
author2 |
Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Rieux, Alissia Weill, Pierre Mouazé, Dominique Tessier, Bernadette |
author_facet |
Rieux, Alissia Weill, Pierre Mouazé, Dominique Tessier, Bernadette |
author_sort |
Rieux, Alissia |
title |
Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
title_short |
Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
title_full |
Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
title_fullStr |
Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
title_full_unstemmed |
Hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
title_sort |
hydrodynamic behaviour of mollusc shell debris: influence of faunal composition |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://normandie-univ.hal.science/hal-02166657 |
op_coverage |
Rome, Italy |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
34th IAS Meeting of Sedimentology https://normandie-univ.hal.science/hal-02166657 34th IAS Meeting of Sedimentology, Sep 2019, Rome, Italy |
op_relation |
hal-02166657 https://normandie-univ.hal.science/hal-02166657 |
_version_ |
1796308425092628480 |