Flow intensification induced by tidal oscillations in tributaries of The Mekong River

Strong currents induced by tidal oscillations have been overlooked in previous flood-risk assessments of the Mekong River. To discuss the potential disaster risk associated with tidal-flow intensification, this study applied ocean tidal modelling to a typical dry season when the tidal regime is pred...

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Bibliographic Details
Published in:International journal of safety and security engineering 2016-08, Vol.6 (3), p.697-703
Main Authors: Takagi, H., Tri, V.P.D., Ty, T.V., Thao, N.D., Anh, L.T., Vinh, G.V.
Format: Article
Language:English
Subjects:
Amplification
Capsizing
Computer simulation
Dry season
Ocean models
Oscillations
Ships
Storm surges
Tributaries
Urban areas
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Summary:Strong currents induced by tidal oscillations have been overlooked in previous flood-risk assessments of the Mekong River. To discuss the potential disaster risk associated with tidal-flow intensification, this study applied ocean tidal modelling to a typical dry season when the tidal regime is predominant compared to the fluvial regime. The model can forecast tidal levels and velocities at a given time and location in the urban area of the Mekong Delta, which is characterized by many tributaries, channels, and low-lying lands, in addition to the main stream of the Mekong River. Numerical simulations revealed that a rapid flow, which could exceed 1 m/s in both the ebb and flood tidal phases, likely occurred along the tributary. Although this study only focused on the tidal regime, such locally intensified flows can be further amplified by a high river discharge or storm surge, having potentially dangerous consequences, such as difficulties in handling ships and small ships being capsized.
ISSN:2041-9031
2041-904X
DOI:10.2495/SAFE-V6-N3-697-703