From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum
Deltas and coastal regions deliver the largest inputs of freshwater and sediments to the shelf and open ocean, understanding water and sediment dynamics and variability in those regions is therefore crucial. The spatio-temporal variability of estuarine and ocean dynamics under the influence of natur...
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Other Authors: | , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://theses.hal.science/tel-02957680 https://theses.hal.science/tel-02957680/document https://theses.hal.science/tel-02957680/file/2019TOU30235a.pdf |
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ftunivnantes:oai:HAL:tel-02957680v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Estuarine to regional circulation Sediment transport Variability In-situ observations regional ocean modelling Estuary-coastal ocean continuum Red River Gulf of Tonkin Circulation estuarienne à régionale Transport sédimentaire Variabilité Modélisation océanique régionale Continuum estuaire-océan côtier Fleuve Rouge Golfe du Tonkin [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Estuarine to regional circulation Sediment transport Variability In-situ observations regional ocean modelling Estuary-coastal ocean continuum Red River Gulf of Tonkin Circulation estuarienne à régionale Transport sédimentaire Variabilité Modélisation océanique régionale Continuum estuaire-océan côtier Fleuve Rouge Golfe du Tonkin [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Piton, Violaine From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
topic_facet |
Estuarine to regional circulation Sediment transport Variability In-situ observations regional ocean modelling Estuary-coastal ocean continuum Red River Gulf of Tonkin Circulation estuarienne à régionale Transport sédimentaire Variabilité Modélisation océanique régionale Continuum estuaire-océan côtier Fleuve Rouge Golfe du Tonkin [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
Deltas and coastal regions deliver the largest inputs of freshwater and sediments to the shelf and open ocean, understanding water and sediment dynamics and variability in those regions is therefore crucial. The spatio-temporal variability of estuarine and ocean dynamics under the influence of natural forcings and their impact on sediment transport and fate was assessed along the Red River estuary - coastal ocean - Gulf of Tonkin continuum. First, in-situ estuarine observations evidenced the seasonal and tidal variabilities of flow and suspended matter, and showed in particular the role of tidal pumping in the estuary siltation. Second, a 3D realistic hydrodynamic model was set up and calibrated with various observations and satellite data. Beforehand, a high-resolution model configuration was implemented and optimized with sensitivity tests of the Gulf of Tonkin's tidal components to bathymetry and various bottom friction parameterizations. Third, the resulting optimized configuration was used to study the large scale Gulf of Tonkin circulation at daily, seasonal and interannual scales, and to identify the drivers of their variabilities. Ekman transport variability due to monsoon winds reversal drives the seasonal circulation, which can be reversed in summer by episodic typhoon events and intensified in winter. ENSO, strong typhoon activity and Arctic Oscillation have been identified as drivers of the interannual circulation variability. Lastly, preliminary tests with a sediment transport module coupled with the hydrodynamics model revealed the importance of the seabed composition and of the parameterization of the erosion coefficients. Les deltas et les régions côtières constituent les sources les plus importantes d'eau douce et de matière en suspension vers le plateau continental puis le large, la compréhension de leur dynamique et de leur variabilité est donc cruciale. Cette thèse vise à mieux comprendre la variabilité spatio-temporelle de la dynamique estuarienne et océanique sous l'influence de forçages ... |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Université Paul Sabatier - Toulouse III Sylvain Ouillon Marine Herrmann |
format |
Doctoral or Postdoctoral Thesis |
author |
Piton, Violaine |
author_facet |
Piton, Violaine |
author_sort |
Piton, Violaine |
title |
From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
title_short |
From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
title_full |
From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
title_fullStr |
From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
title_full_unstemmed |
From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
title_sort |
from the red river to the gulf of tonkin : dynamics and sediment transport along the estuary-coastal area continnum |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://theses.hal.science/tel-02957680 https://theses.hal.science/tel-02957680/document https://theses.hal.science/tel-02957680/file/2019TOU30235a.pdf |
long_lat |
ENVELOPE(70.250,70.250,-49.350,-49.350) ENVELOPE(-65.042,-65.042,-67.825,-67.825) |
geographic |
Arctic Le Plateau Tonkin |
geographic_facet |
Arctic Le Plateau Tonkin |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
https://theses.hal.science/tel-02957680 Oceanography. Université Paul Sabatier - Toulouse III, 2019. English. ⟨NNT : 2019TOU30235⟩ |
op_relation |
NNT: 2019TOU30235 tel-02957680 https://theses.hal.science/tel-02957680 https://theses.hal.science/tel-02957680/document https://theses.hal.science/tel-02957680/file/2019TOU30235a.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766348947709755392 |
spelling |
ftunivnantes:oai:HAL:tel-02957680v1 2023-05-15T15:18:46+02:00 From the Red River to the Gulf of Tonkin : dynamics and sediment transport along the estuary-coastal area continnum Du Fleuve Rouge au golfe du Tonkin : dynamique et transport sédimentaire le long du continuum estuaire-zone côtière Piton, Violaine Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Université Paul Sabatier - Toulouse III Sylvain Ouillon Marine Herrmann 2019-12-16 https://theses.hal.science/tel-02957680 https://theses.hal.science/tel-02957680/document https://theses.hal.science/tel-02957680/file/2019TOU30235a.pdf en eng HAL CCSD NNT: 2019TOU30235 tel-02957680 https://theses.hal.science/tel-02957680 https://theses.hal.science/tel-02957680/document https://theses.hal.science/tel-02957680/file/2019TOU30235a.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-02957680 Oceanography. Université Paul Sabatier - Toulouse III, 2019. English. ⟨NNT : 2019TOU30235⟩ Estuarine to regional circulation Sediment transport Variability In-situ observations regional ocean modelling Estuary-coastal ocean continuum Red River Gulf of Tonkin Circulation estuarienne à régionale Transport sédimentaire Variabilité Modélisation océanique régionale Continuum estuaire-océan côtier Fleuve Rouge Golfe du Tonkin [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/doctoralThesis Theses 2019 ftunivnantes 2023-02-22T04:40:47Z Deltas and coastal regions deliver the largest inputs of freshwater and sediments to the shelf and open ocean, understanding water and sediment dynamics and variability in those regions is therefore crucial. The spatio-temporal variability of estuarine and ocean dynamics under the influence of natural forcings and their impact on sediment transport and fate was assessed along the Red River estuary - coastal ocean - Gulf of Tonkin continuum. First, in-situ estuarine observations evidenced the seasonal and tidal variabilities of flow and suspended matter, and showed in particular the role of tidal pumping in the estuary siltation. Second, a 3D realistic hydrodynamic model was set up and calibrated with various observations and satellite data. Beforehand, a high-resolution model configuration was implemented and optimized with sensitivity tests of the Gulf of Tonkin's tidal components to bathymetry and various bottom friction parameterizations. Third, the resulting optimized configuration was used to study the large scale Gulf of Tonkin circulation at daily, seasonal and interannual scales, and to identify the drivers of their variabilities. Ekman transport variability due to monsoon winds reversal drives the seasonal circulation, which can be reversed in summer by episodic typhoon events and intensified in winter. ENSO, strong typhoon activity and Arctic Oscillation have been identified as drivers of the interannual circulation variability. Lastly, preliminary tests with a sediment transport module coupled with the hydrodynamics model revealed the importance of the seabed composition and of the parameterization of the erosion coefficients. Les deltas et les régions côtières constituent les sources les plus importantes d'eau douce et de matière en suspension vers le plateau continental puis le large, la compréhension de leur dynamique et de leur variabilité est donc cruciale. Cette thèse vise à mieux comprendre la variabilité spatio-temporelle de la dynamique estuarienne et océanique sous l'influence de forçages ... Doctoral or Postdoctoral Thesis Arctic Université de Nantes: HAL-UNIV-NANTES Arctic Le Plateau ENVELOPE(70.250,70.250,-49.350,-49.350) Tonkin ENVELOPE(-65.042,-65.042,-67.825,-67.825) |