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Etude expérimentale de la dynamique sédimentaire des rivières en tresses

Author: Pauline LeducMohamed NaaimAlain ReckingPhilippe BelleudyUniversité de Grenoble (2009-2014).All authors
Publisher: 2013.
Dissertation: Thèse de doctorat : Sciences de la terre et de l'univers, et de l'environnement : Grenoble : 2013.
Edition/Format:   Computer file : Document : Thesis/dissertation : French
Summary:
Les mécanismes complexes qui régissent la morphologie des rivières en tresses et l'interaction avec le tri granulométrique restent encore à approfondir. Cette thèse s'articule autour de trois thèmes : l'étude de la déstabilisation d'un système en tresses puis sa mise à l'équilibre, l'interaction de la morphologie avec le tri granulométrique et enfin la prédiction du transport solide. Pour cela, nous
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Genre/Form: Thèses et écrits académiques
Material Type: Document, Thesis/dissertation, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Pauline Leduc; Mohamed Naaim; Alain Recking; Philippe Belleudy; Université de Grenoble (2009-2014).; École doctorale terre, univers, environnement (Grenoble).; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (France). Centre de Grenoble.
OCLC Number: 911590702
Notes: Titre provenant de l'écran-titre.
Description: 1 online resource
Responsibility: Pauline Leduc ; sous la direction de Mohamed Naaim et de Alain Recking.

Abstract:

Les mécanismes complexes qui régissent la morphologie des rivières en tresses et l'interaction avec le tri granulométrique restent encore à approfondir. Cette thèse s'articule autour de trois thèmes : l'étude de la déstabilisation d'un système en tresses puis sa mise à l'équilibre, l'interaction de la morphologie avec le tri granulométrique et enfin la prédiction du transport solide. Pour cela, nous avons étudié 3 modélisations de différents systèmes alluviaux : des bancs alternés en granulométrie étendue (durée 100h), un système en tresses en granulométrie uniforme (durée 385h) et enfin un système en granulométrie étendue (durée 435h). Chaque modèle de tresses a subi plusieurs changements de conditions d'alimentation. Il ressort que seul un paramètre, la surface du lit situé au delà de la pente moyenne, pourrait être un bon candidat pour comparer l'état d'équilibre (érosion ou exhaussement) de différents systèmes. Pour une étude d'un site donnée, les paramètres classiques comme la pente ou le Bed Relief Index (BRI) sont tout aussi pertinents. Le tri granulométrique sur les systèmes divaguants se manifeste de plusieurs façons : il est à l'origine de la migration du chenal principal et participe activement à la formation de patchs sédimentaires, catalyseurs de l'émergence des bancs. Les lobes sédimentaires qui se retrouvent dans le modèle en granulométrie uniforme n'apparaissent que dans certains cas, laissant place à une mobilité des sédiments discontinue, généralement de proche en proche. La modélisation du transport solide dans ces systèmes à faciès complexes se heurte à la forte variabilité des conditions hyro-sédimentaires. L'abondance de confluences et des fronts de bancs modifie la relation de transport avec les conditions locales. L'influence de la morphologie est prépondérante dans la dynamique du transport solide.

Complex mechanisms involved in braided rivers morphology and the interaction with the grain sorting are slightly studied. Throughout this thesis, we study the morphological signature of a system at equilibrium, and the interaction between the bed morphology and grain sorting. From our small-scale experiments, we studied the prediction of sediment transport. We studied three different small-scale streams, a alternate bars model with heterogeneous sediment (duration 100h), a braided stream model using uniform sand (duration 385h) and a braided stream model using sand and coarse sand mixture (duration 435h). Upstream conditions have been changed several times for each braided stream. It appears that the only one relevant index to compare sediments stages of different streams is the surface above the average slope. To study a single site's evolution, the traditional parameters such as slope or Bed Relief Index (BRI) are relevant enough. We observed different effects of grain sorting. First, grain sorting is responsible of selective depositions and led to active channel migration. The selective deposition leads to bar emergence. Sedimentary lobes that we observed on uniform sand model were rarely noticed on the sand and coarse sand mixture experiment. This results suggests that sediments motion is tiny linked to grain size range. Modeling of sediment transport in such varied morphology faces different problems. Plenty of confluences and fronts bars changes sediment transport and local conditions connections. The influence of morphology is predominant in the dynamic of sediment transport.

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<http:\/\/www.worldcat.org\/oclc\/911590702<\/a>> # Etude exp\u00E9rimentale de la dynamique s\u00E9dimentaire des rivi\u00E8res en tresses<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:MediaObject<\/a>, schema:CreativeWork<\/a>, bgn:Thesis<\/a>, bgn:ComputerFile<\/a> ;\u00A0\u00A0\u00A0\nbgn:inSupportOf<\/a> \"Th\u00E8se de doctorat : Sciences de la terre et de l\'univers, et de l\'environnement : Grenoble : 2013.<\/span>\" ;\u00A0\u00A0\u00A0\nlibrary:oclcnum<\/a> \"911590702<\/span>\" ;\u00A0\u00A0\u00A0\nlibrary:placeOfPublication<\/a> <http:\/\/id.loc.gov\/vocabulary\/countries\/fr<\/a>> ;\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Thing\/riviere_en_tresses<\/a>> ; # Rivi\u00E8re en tresses<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Topic\/granulometrie<\/a>> ; # Granulom\u00E9trie<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Topic\/charge_de_fond<\/a>> ; # Charge de fond<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/dewey.info\/class\/550\/<\/a>> ;\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Thing\/equilibre<\/a>> ; # \u00C9quilibre<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Thing\/charriage<\/a>> ; # Charriage<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Thing\/tri_granulometrique<\/a>> ; # Tri granulom\u00E9trique<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Thing\/morphologie<\/a>> ; # Morphologie<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Topic\/sediments_marins<\/a>> ; # S\u00E9diments marins<\/span>\n\u00A0\u00A0\u00A0\nschema:author<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/leduc_pauline_1985<\/a>> ; # Pauline Leduc<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/recking_alain_1967<\/a>> ; # Alain Recking<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Organization\/institut_national_de_recherche_en_sciences_et_technologies_pour_l_environnement_et_l_agriculture_france_centre_de_grenoble<\/a>> ; # Institut national de recherche en sciences et technologies pour l\'environnement et l\'agriculture (France). Centre de Grenoble.<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/naaim_mohamed_1962<\/a>> ; # Mohamed Naaim<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Organization\/universite_de_grenoble_2009_2014<\/a>> ; # Universit\u00E9 de Grenoble (2009-2014).<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/belleudy_philippe<\/a>> ; # Philippe Belleudy<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Organization\/ecole_doctorale_terre_univers_environnement_grenoble<\/a>> ; # \u00C9cole doctorale terre, univers, environnement (Grenoble).<\/span>\n\u00A0\u00A0\u00A0\nschema:datePublished<\/a> \"2013<\/span>\" ;\u00A0\u00A0\u00A0\nschema:description<\/a> \"Complex mechanisms involved in braided rivers morphology and the interaction with the grain sorting are slightly studied. Throughout this thesis, we study the morphological signature of a system at equilibrium, and the interaction between the bed morphology and grain sorting. From our small-scale experiments, we studied the prediction of sediment transport. We studied three different small-scale streams, a alternate bars model with heterogeneous sediment (duration 100h), a braided stream model using uniform sand (duration 385h) and a braided stream model using sand and coarse sand mixture (duration 435h). Upstream conditions have been changed several times for each braided stream. It appears that the only one relevant index to compare sediments stages of different streams is the surface above the average slope. To study a single site\'s evolution, the traditional parameters such as slope or Bed Relief Index (BRI) are relevant enough. We observed different effects of grain sorting. First, grain sorting is responsible of selective depositions and led to active channel migration. The selective deposition leads to bar emergence. Sedimentary lobes that we observed on uniform sand model were rarely noticed on the sand and coarse sand mixture experiment. This results suggests that sediments motion is tiny linked to grain size range. Modeling of sediment transport in such varied morphology faces different problems. Plenty of confluences and fronts bars changes sediment transport and local conditions connections. The influence of morphology is predominant in the dynamic of sediment transport.<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\nschema:description<\/a> \"Les m\u00E9canismes complexes qui r\u00E9gissent la morphologie des rivi\u00E8res en tresses et l\'interaction avec le tri granulom\u00E9trique restent encore \u00E0 approfondir. Cette th\u00E8se s\'articule autour de trois th\u00E8mes : l\'\u00E9tude de la d\u00E9stabilisation d\'un syst\u00E8me en tresses puis sa mise \u00E0 l\'\u00E9quilibre, l\'interaction de la morphologie avec le tri granulom\u00E9trique et enfin la pr\u00E9diction du transport solide. Pour cela, nous avons \u00E9tudi\u00E9 3 mod\u00E9lisations de diff\u00E9rents syst\u00E8mes alluviaux : des bancs altern\u00E9s en granulom\u00E9trie \u00E9tendue (dur\u00E9e 100h), un syst\u00E8me en tresses en granulom\u00E9trie uniforme (dur\u00E9e 385h) et enfin un syst\u00E8me en granulom\u00E9trie \u00E9tendue (dur\u00E9e 435h). Chaque mod\u00E8le de tresses a subi plusieurs changements de conditions d\'alimentation. Il ressort que seul un param\u00E8tre, la surface du lit situ\u00E9 au del\u00E0 de la pente moyenne, pourrait \u00EAtre un bon candidat pour comparer l\'\u00E9tat d\'\u00E9quilibre (\u00E9rosion ou exhaussement) de diff\u00E9rents syst\u00E8mes. Pour une \u00E9tude d\'un site donn\u00E9e, les param\u00E8tres classiques comme la pente ou le Bed Relief Index (BRI) sont tout aussi pertinents. Le tri granulom\u00E9trique sur les syst\u00E8mes divaguants se manifeste de plusieurs fa\u00E7ons : il est \u00E0 l\'origine de la migration du chenal principal et participe activement \u00E0 la formation de patchs s\u00E9dimentaires, catalyseurs de l\'\u00E9mergence des bancs. Les lobes s\u00E9dimentaires qui se retrouvent dans le mod\u00E8le en granulom\u00E9trie uniforme n\'apparaissent que dans certains cas, laissant place \u00E0 une mobilit\u00E9 des s\u00E9diments discontinue, g\u00E9n\u00E9ralement de proche en proche. La mod\u00E9lisation du transport solide dans ces syst\u00E8mes \u00E0 faci\u00E8s complexes se heurte \u00E0 la forte variabilit\u00E9 des conditions hyro-s\u00E9dimentaires. L\'abondance de confluences et des fronts de bancs modifie la relation de transport avec les conditions locales. L\'influence de la morphologie est pr\u00E9pond\u00E9rante dans la dynamique du transport solide.<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\nschema:exampleOfWork<\/a> <http:\/\/worldcat.org\/entity\/work\/id\/2555770650<\/a>> ;\u00A0\u00A0\u00A0\nschema:genre<\/a> \"Th\u00E8ses et \u00E9crits acad\u00E9miques<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\nschema:inLanguage<\/a> \"fr<\/span>\" ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Etude exp\u00E9rimentale de la dynamique s\u00E9dimentaire des rivi\u00E8res en tresses<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\nschema:productID<\/a> \"911590702<\/span>\" ;\u00A0\u00A0\u00A0\nschema:url<\/a> <http:\/\/www.theses.fr\/2013GRENU039\/document<\/a>> ;\u00A0\u00A0\u00A0\nschema:url<\/a> <http:\/\/www.theses.fr\/2013GRENU039\/abes<\/a>> ;\u00A0\u00A0\u00A0\nschema:url<\/a> <https:\/\/tel.archives-ouvertes.fr\/tel-01167872<\/a>> ;\u00A0\u00A0\u00A0\nwdrs:describedby<\/a> <http:\/\/www.worldcat.org\/title\/-\/oclc\/911590702<\/a>> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n\n

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<http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/belleudy_philippe<\/a>> # Philippe Belleudy<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Person<\/a> ;\u00A0\u00A0\u00A0\nschema:familyName<\/a> \"Belleudy<\/span>\" ;\u00A0\u00A0\u00A0\nschema:givenName<\/a> \"Philippe<\/span>\" ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Philippe Belleudy<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/leduc_pauline_1985<\/a>> # Pauline Leduc<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Person<\/a> ;\u00A0\u00A0\u00A0\nschema:birthDate<\/a> \"1985<\/span>\" ;\u00A0\u00A0\u00A0\nschema:deathDate<\/a> \"\" ;\u00A0\u00A0\u00A0\nschema:familyName<\/a> \"Leduc<\/span>\" ;\u00A0\u00A0\u00A0\nschema:givenName<\/a> \"Pauline<\/span>\" ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Pauline Leduc<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/naaim_mohamed_1962<\/a>> # Mohamed Naaim<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Person<\/a> ;\u00A0\u00A0\u00A0\nschema:birthDate<\/a> \"1962<\/span>\" ;\u00A0\u00A0\u00A0\nschema:deathDate<\/a> \"\" ;\u00A0\u00A0\u00A0\nschema:familyName<\/a> \"Naaim<\/span>\" ;\u00A0\u00A0\u00A0\nschema:givenName<\/a> \"Mohamed<\/span>\" ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Mohamed Naaim<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Person\/recking_alain_1967<\/a>> # Alain Recking<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Person<\/a> ;\u00A0\u00A0\u00A0\nschema:birthDate<\/a> \"1967<\/span>\" ;\u00A0\u00A0\u00A0\nschema:deathDate<\/a> \"\" ;\u00A0\u00A0\u00A0\nschema:familyName<\/a> \"Recking<\/span>\" ;\u00A0\u00A0\u00A0\nschema:givenName<\/a> \"Alain<\/span>\" ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Alain Recking<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
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<http:\/\/experiment.worldcat.org\/entity\/work\/data\/2555770650#Topic\/sediments_marins<\/a>> # S\u00E9diments marins<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Intangible<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"S\u00E9diments marins<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
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<http:\/\/www.worldcat.org\/title\/-\/oclc\/911590702<\/a>>\u00A0\u00A0\u00A0\u00A0a \ngenont:InformationResource<\/a>, genont:ContentTypeGenericResource<\/a> ;\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/www.worldcat.org\/oclc\/911590702<\/a>> ; # Etude exp\u00E9rimentale de la dynamique s\u00E9dimentaire des rivi\u00E8res en tresses<\/span>\n\u00A0\u00A0\u00A0\nschema:dateModified<\/a> \"2020-05-27<\/span>\" ;\u00A0\u00A0\u00A0\nvoid:inDataset<\/a> <http:\/\/purl.oclc.org\/dataset\/WorldCat<\/a>> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n\n

Content-negotiable representations<\/p>\n