Estuarine Circulation Patterns in a Complex Geometry Estuary: Dinh An Estuary, Mekong River

Estuarine Circulation Patterns in a Complex Geometry Estuary: Dinh An Estuary, Mekong River Estuarine circulation (EC) is a natural phenomenon that contributes to the evolution of estuaries worldwide. This paper uses the Dinh An estuary, Mekong River as a case study to investigate patterns of EC in a complex cross-section estuary. An Acoustic Doppler Current Profiler (ADCP) measured a series of river discharge and current profiles at a transect near the mouth of the estuary between 15 and 30 September 2009. Tidal elevation was also recorded concurrently with the river discharge by using a leveling rod. The observed data reveal that the river-discharge phase lagged 6 h behind the tidal phase in the high-flow season (May to October). Four main types of EC were observed during the reversal time in the ebb tide with river discharges in a range of −5000 m3/s to 13,600 m3/s. There were two main flood tide patterns, which corresponded to the discharges from −6000 m3/s to 5000 m3/s. The classical EC type (seawater flows landward near the bed and river water flows seaward near the surface) appeared only in the deepest channel in the ebb tide as saline intrusion induced a density imbalance. The results suggest that tidal phase and bed geometry play important roles in forming EC patterns in estuaries. This paper provides essential information related to flow structure in complex bathymetry estuaries for further studies on saline intrusion, environmental processes, sediment dynamic and estuarine morphology. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Processes Springer Journals

Estuarine Circulation Patterns in a Complex Geometry Estuary: Dinh An Estuary, Mekong River

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer International Publishing AG, part of Springer Nature
Subject
Earth Sciences; Environmental Science and Engineering; Environmental Management; Waste Management/Waste Technology; Water Quality/Water Pollution
ISSN
2198-7491
eISSN
2198-7505
D.O.I.
10.1007/s40710-018-0308-5
Publisher site
See Article on Publisher Site

Abstract

Estuarine circulation (EC) is a natural phenomenon that contributes to the evolution of estuaries worldwide. This paper uses the Dinh An estuary, Mekong River as a case study to investigate patterns of EC in a complex cross-section estuary. An Acoustic Doppler Current Profiler (ADCP) measured a series of river discharge and current profiles at a transect near the mouth of the estuary between 15 and 30 September 2009. Tidal elevation was also recorded concurrently with the river discharge by using a leveling rod. The observed data reveal that the river-discharge phase lagged 6 h behind the tidal phase in the high-flow season (May to October). Four main types of EC were observed during the reversal time in the ebb tide with river discharges in a range of −5000 m3/s to 13,600 m3/s. There were two main flood tide patterns, which corresponded to the discharges from −6000 m3/s to 5000 m3/s. The classical EC type (seawater flows landward near the bed and river water flows seaward near the surface) appeared only in the deepest channel in the ebb tide as saline intrusion induced a density imbalance. The results suggest that tidal phase and bed geometry play important roles in forming EC patterns in estuaries. This paper provides essential information related to flow structure in complex bathymetry estuaries for further studies on saline intrusion, environmental processes, sediment dynamic and estuarine morphology.

Journal

Environmental ProcessesSpringer Journals

Published: May 24, 2018

References

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