Gratiot Nicolas, Bildstein A., Anh T. T., Thoss H., Denis H., Michallet H., Apel H. (2017). Sediment flocculation in the Mekong River estuary, Vietnam, an important driver of geomorphological changes. In :
Manighetti I (ed.), De Witt R. (ed.), Duvail Stéphanie (ed.), Seyler Patrick (ed.). Vulnerability of inter-tropical littoral areas. Comptes Rendus Geoscience, 349 (6-7), p. 260-268. ISSN 1631-0713.
Titre du document
Sediment flocculation in the Mekong River estuary, Vietnam, an important driver of geomorphological changes
Année de publication
2017
Auteurs
Gratiot Nicolas, Bildstein A., Anh T. T., Thoss H., Denis H., Michallet H., Apel H.
In
Manighetti I (ed.), De Witt R. (ed.), Duvail Stéphanie (ed.), Seyler Patrick (ed.), Vulnerability of inter-tropical littoral areas
Source
Comptes Rendus Geoscience, 2017,
349 (6-7), p. 260-268 ISSN 1631-0713
Over the past several decades, major hydro-sedimentary changes have occurred in both continental and coastal regions of the Mekong Delta, and this has severely impacted coastal erosion. A good characterization of floc properties and of their changes over time is necessary to gain comprehensive understanding and modelling of hydrodynamics and of the associated geomorphological changes. This paper quantifies the influence of sediment concentration, turbulence and differential particle settling on flocculation through field and laboratory investigations of the Mekong estuary. For concentrations lower than 200 mg.L-1, the particles do not exhibit a dynamic response to their environment, while for higher concentrations (up to 3-4 g.L-1), particle size and settling velocity increased by more than one order of magnitude. Flocculation by differential settling has not been sufficiently investigated yet, but this study reveals it as a predominant factor for siltation in quiescent environments such as the ones existing in the inner mangrove fringe. Such results are important to provide realistic simulations of the coastal evolution.
Plan de classement
Hydrologie [062]
;
Géologie et formations superficielles [064]
Description Géographique
VIET NAM ; MEKONG BASSIN
Localisation
Fonds IRD [F B010071890]
Identifiant IRD
fdi:010071890
