Morphological responses of an estuarine intertidal mudflat to constructions since 1978 to 2005: The Seine estuary (France)
Identifieur interne : 000530 ( Hal/Checkpoint ); précédent : 000529; suivant : 000531Morphological responses of an estuarine intertidal mudflat to constructions since 1978 to 2005: The Seine estuary (France)
Auteurs : A. Cuvilliez [France] ; J. Deloffre [France] ; R. Lafite [France] ; Ch. Bessineton [France]Source :
- Geomorphology [ 0169-555X ] ; 2009-01-13.
English descriptors
Abstract
Since 1834 the Seine estuary (France) has been the site of numerous construction projects with the aim to accommodate and secure boat traffic. Since 1978, the increasing of the activities of Le Havre port, located at the mouth of the estuary, has accelerated the construction work rate. Several dykes, a bridge, and new port facilities have been constructed in rapid succession, modifying considerably the hydrodynamic conditions which sustain a partially vegetated sandy–muddy tidal flat located in the North bank of the estuary between the new port of Le Havre and the Normandy bridge achieved in 1995. The present study deals with the morphological evolution of this zone from 1978 to 2005. The use of a low altitude remote sensing technique combined with traditional methods of ground survey and probes allow to demonstrate the impact of human activities on sedimentary and vegetation dynamics. The Northern mudflat of the estuary is the most affected by these human activities, which surface have reduced of 62% during the last 27 years with an intensified local erosion during the last 27 months corresponding to a loss 1250 000 m3 of fine-grained sediment. At the same time, the general sanding up in the channel of the zone has caused a loss of more than 31% of the tidal prism, more than three quarters of which occurred during the last three years. Results also establish that the response times of the sedimentary or topographic readjustment to an installation depend on the extent and the nature of the construction. In fact, the sedimentary readjustments to an installation can be delayed by up to 10 years in the case of the Seine estuary. This delay is explained by a rapid succession of construction works which may occult the effect of a single installation. Except in the case of a dyke built perpendicular to ebb and flood currents, the impacts of these installations reach a hydrosedimentary equilibrium on the level between 1 and 7 years after their completion.
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DOI: 10.1016/j.geomorph.2008.08.010
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Bessineton</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-104421" status="INCOMING"><orgName>Maison de l'estuaire de la Seine</orgName><desc><address><addrLine>Center of Scientific culture and Technique of the Estuary, 76600 Le Havre, France</addrLine><country key="FR"></country></address></desc><listRelation><relation active="#struct-325050" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-325050" type="direct"><org type="institution" xml:id="struct-325050" status="INCOMING"><orgName>Maison de l'estuaire de la Seine</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle></tutelles></hal:affiliation><country>France</country></affiliation></author></analytic><idno type="DOI">10.1016/j.geomorph.2008.08.010</idno><series><title level="j">Geomorphology</title><idno type="ISSN">0169-555X</idno><imprint><date type="datePub">2009-01-13</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>Remote sensing Tidal mudflat Human impact Macrotidal estuary</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Since 1834 the Seine estuary (France) has been the site of numerous construction projects with the aim to accommodate and secure boat traffic. Since 1978, the increasing of the activities of Le Havre port, located at the mouth of the estuary, has accelerated the construction work rate. Several dykes, a bridge, and new port facilities have been constructed in rapid succession, modifying considerably the hydrodynamic conditions which sustain a partially vegetated sandy–muddy tidal flat located in the North bank of the estuary between the new port of Le Havre and the Normandy bridge achieved in 1995. The present study deals with the morphological evolution of this zone from 1978 to 2005. The use of a low altitude remote sensing technique combined with traditional methods of ground survey and probes allow to demonstrate the impact of human activities on sedimentary and vegetation dynamics. The Northern mudflat of the estuary is the most affected by these human activities, which surface have reduced of 62% during the last 27 years with an intensified local erosion during the last 27 months corresponding to a loss 1250 000 m3 of fine-grained sediment. At the same time, the general sanding up in the channel of the zone has caused a loss of more than 31% of the tidal prism, more than three quarters of which occurred during the last three years. Results also establish that the response times of the sedimentary or topographic readjustment to an installation depend on the extent and the nature of the construction. In fact, the sedimentary readjustments to an installation can be delayed by up to 10 years in the case of the Seine estuary. This delay is explained by a rapid succession of construction works which may occult the effect of a single installation. Except in the case of a dyke built perpendicular to ebb and flood currents, the impacts of these installations reach a hydrosedimentary equilibrium on the level between 1 and 7 years after their completion.</div></front></TEI><hal api="V3"><titleStmt><title xml:lang="en">Morphological responses of an estuarine intertidal mudflat to constructions since 1978 to 2005: The Seine estuary (France)</title><author role="aut"><persName><forename type="first">A.</forename><surname>Cuvilliez</surname></persName><email></email><idno type="halauthor">1149148</idno><affiliation ref="#struct-847"></affiliation><affiliation ref="#struct-104420"></affiliation></author><author role="aut"><persName><forename type="first">J.</forename><surname>Deloffre</surname></persName><email>julien.deloffre@univ-rouen.fr</email><idno type="halauthor">240080</idno><affiliation ref="#struct-847"></affiliation></author><author role="aut"><persName><forename type="first">R.</forename><surname>Lafite</surname></persName><email>robert.lafite@univ-rouen.fr</email><idno type="halauthor">77930</idno><affiliation ref="#struct-847"></affiliation></author><author role="aut"><persName><forename type="first">Ch.</forename><surname>Bessineton</surname></persName><email></email><idno type="halauthor">1149149</idno><affiliation ref="#struct-104421"></affiliation></author><editor role="depositor"><persName><forename>Valérie</forename><surname>Casado-Malaizé</surname></persName><email>valerie.casado-malaize@unicaen.fr</email></editor></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2009-11-20 10:28:23</date><date type="whenModified">2015-03-26 01:05:05</date><date type="whenReleased">2009-11-20 10:28:23</date><date type="whenProduced">2009-01-13</date></edition><respStmt><resp>contributor</resp><name key="113231"><persName><forename>Valérie</forename><surname>Casado-Malaizé</surname></persName><email>valerie.casado-malaize@unicaen.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">hal-00433757</idno><idno type="halUri">https://hal.archives-ouvertes.fr/hal-00433757</idno><idno type="halBibtex">cuvilliez:hal-00433757</idno><idno type="halRefHtml">Geomorphology, Elsevier, 2009, 104, pp.165-174. <10.1016/j.geomorph.2008.08.010></idno><idno type="halRef">Geomorphology, Elsevier, 2009, 104, pp.165-174. <10.1016/j.geomorph.2008.08.010></idno></publicationStmt><seriesStmt><idno type="stamp" n="SDE">Sciences De l'Environnement</idno><idno type="stamp" n="UNIV-LEHAVRE">Université du Havre</idno><idno type="stamp" n="GIP-BE">GIP Bretagne Environnement</idno><idno type="stamp" n="UMR6143M2C">productions UMR 6143</idno><idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno><idno type="stamp" n="UNIV-CAEN">Université de Caen</idno><idno type="stamp" n="UNIV-ROUEN">Université de Rouen</idno><idno type="stamp" n="INSU">INSU - Institut National des Sciences de l'Univers</idno></seriesStmt><notesStmt><note type="audience" n="2">International</note><note type="popular" n="0">No</note><note type="peer" n="1">Yes</note></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Morphological responses of an estuarine intertidal mudflat to constructions since 1978 to 2005: The Seine estuary (France)</title><author role="aut"><persName><forename type="first">A.</forename><surname>Cuvilliez</surname></persName><idno type="halAuthorId">1149148</idno><affiliation ref="#struct-847"></affiliation><affiliation ref="#struct-104420"></affiliation></author><author role="aut"><persName><forename type="first">J.</forename><surname>Deloffre</surname></persName><email>julien.deloffre@univ-rouen.fr</email><idno type="halAuthorId">240080</idno><affiliation ref="#struct-847"></affiliation></author><author role="aut"><persName><forename type="first">R.</forename><surname>Lafite</surname></persName><email>robert.lafite@univ-rouen.fr</email><idno type="halAuthorId">77930</idno><affiliation ref="#struct-847"></affiliation></author><author role="aut"><persName><forename type="first">Ch.</forename><surname>Bessineton</surname></persName><idno type="halAuthorId">1149149</idno><affiliation ref="#struct-104421"></affiliation></author></analytic><monogr><idno type="halJournalId" status="VALID">13642</idno><idno type="issn">0169-555X</idno><title level="j">Geomorphology</title><imprint><publisher>Elsevier</publisher><biblScope unit="volume">104</biblScope><biblScope unit="pp">165-174</biblScope><date type="datePub">2009-01-13</date></imprint></monogr><idno type="doi">10.1016/j.geomorph.2008.08.010</idno></biblStruct></sourceDesc><profileDesc><langUsage><language ident="en">English</language></langUsage><textClass><keywords scheme="author"><term xml:lang="en">Remote sensing Tidal mudflat Human impact Macrotidal estuary</term></keywords><classCode scheme="halDomain" n="sdu.envi">Sciences of the Universe [physics]/Continental interfaces, environment</classCode><classCode scheme="halDomain" n="sde.mcg">Environmental Sciences/Global Changes</classCode><classCode scheme="halTypology" n="ART">Journal articles</classCode></textClass><abstract xml:lang="en">Since 1834 the Seine estuary (France) has been the site of numerous construction projects with the aim to accommodate and secure boat traffic. Since 1978, the increasing of the activities of Le Havre port, located at the mouth of the estuary, has accelerated the construction work rate. Several dykes, a bridge, and new port facilities have been constructed in rapid succession, modifying considerably the hydrodynamic conditions which sustain a partially vegetated sandy–muddy tidal flat located in the North bank of the estuary between the new port of Le Havre and the Normandy bridge achieved in 1995. The present study deals with the morphological evolution of this zone from 1978 to 2005. The use of a low altitude remote sensing technique combined with traditional methods of ground survey and probes allow to demonstrate the impact of human activities on sedimentary and vegetation dynamics. The Northern mudflat of the estuary is the most affected by these human activities, which surface have reduced of 62% during the last 27 years with an intensified local erosion during the last 27 months corresponding to a loss 1250 000 m3 of fine-grained sediment. At the same time, the general sanding up in the channel of the zone has caused a loss of more than 31% of the tidal prism, more than three quarters of which occurred during the last three years. Results also establish that the response times of the sedimentary or topographic readjustment to an installation depend on the extent and the nature of the construction. In fact, the sedimentary readjustments to an installation can be delayed by up to 10 years in the case of the Seine estuary. This delay is explained by a rapid succession of construction works which may occult the effect of a single installation. Except in the case of a dyke built perpendicular to ebb and flood currents, the impacts of these installations reach a hydrosedimentary equilibrium on the level between 1 and 7 years after their completion.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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