Analysis and numerical modeling of the flow and sand dynamics in the lower Song Hau channel, Mekong Delta

Xing, Fei; Meselhe, E. A.; Allison, Mead A.; Weathers, H. Dallon

doi:10.1016/j.csr.2017.08.003

Cited by 29 publications

(26 citation statements)

References 53 publications

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“…Ideal estuaries are said to be characterised by an along-channel constant velocity amplitude and depth [18,54] and these features are reproduced by the tool predictions. Moreover, the predictions correspond to observations in the Tran De branch of the Mekong: observed peak flow velocity is approximately 1 ms −1 along the entire branch [55,56] and salinity intrusion reaches up to 45-55 km from the mouth [54]. In addition, the along-channel predicted salinities fall within the range of observed salinities [54].…”

Section: Applicability To End-member Systems: a River An Ideal Estuasupporting

confidence: 77%

“…It should be noted that, in the last case, along-channel width is measured perpendicular to the tidal channels, which means that the transects for an idealised tidal basin are semicircles. The predictions for the Tran De branch were compared with measured data [54][55][56] and the predictions for the tidal basin were compared with numerical model results [31,57].…”

Section: Tool Application To End-member Casesmentioning

confidence: 99%

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Empirical Assessment Tool for Bathymetry, Flow Velocity and Salinity in Estuaries Based on Tidal Amplitude and Remotely-Sensed Imagery

et al. 2018

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Hydromorphological data for many estuaries worldwide is scarce and usually limited to offshore tidal amplitude and remotely-sensed imagery. In many projects, information about morphology and intertidal area is needed to assess the effects of human interventions and rising sea-level on the natural depth distribution and on changing habitats. Habitat area depends on the spatial pattern of intertidal area, inundation time, peak flow velocities and salinity. While numerical models can reproduce these spatial patterns fairly well, their data need and computational costs are high and for each case a new model must be developed. Here, we present a Python tool that includes a comprehensive set of relations that predicts the hydrodynamics, bed elevation and the patterns of channels and bars in mere seconds. Predictions are based on a combination of empirical relations derived from natural estuaries, including a novel predictor for cross-sectional depth distributions, which is dependent on the along-channel width profile. Flow velocity, an important habitat characteristic, is calculated with a new correlation between depth below high water level and peak tidal flow velocity, which was based on spatial numerical modelling. Salinity is calculated from estuarine geometry and flow conditions. The tool only requires an along-channel width profile and tidal amplitude, making it useful for quick assessments, for example of potential habitat in ecology, when only remotely-sensed imagery is available.

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Section: Applicability To End-member Systems: a River An Ideal Estuasupporting

confidence: 77%

Section: Tool Application To End-member Casesmentioning

confidence: 99%

Empirical Assessment Tool for Bathymetry, Flow Velocity and Salinity in Estuaries Based on Tidal Amplitude and Remotely-Sensed Imagery

et al. 2018

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“…The wet season is characterized by high fluvial sediment supply, with sediment export to the sea and the generation of a plume that extended 100 km outward of the river mouth; suspended‐sediment concentration is relatively high (50 to 300 mg/l) across most of the delta (Fig. A; Wolanski et al ., ; Wolanski & Spagnol, ; Xue et al ., ; Heege et al ., ; Loisel et al ., ; Nowacki et al ., ; Vinh et al ., ; McLachlan et al ., ; Xing et al ., ). The dry season is characterized by limited fluvial sediment supply with landward sediment import due to tidal processes; suspended‐sediment concentration is low (<50 mg/l) in the upstream part of the delta and high (reaching values >500 mg/l) in the downstream part (Fig.…”

Section: Study Areamentioning

confidence: 99%

“…The dry season is characterized by limited fluvial sediment supply with landward sediment import due to tidal processes; suspended‐sediment concentration is low (<50 mg/l) in the upstream part of the delta and high (reaching values >500 mg/l) in the downstream part (Fig. B; Wolanski et al ., ; Wolanski & Spagnol, ; Heege et al ., ; Nowacki et al ., ; Vinh et al ., ; McLachlan et al ., ; Xing et al ., ). Because the amount of sediment exported during the wet season is higher than that imported during the dry season, the delta is undergoing a progradation of its shoreline and actively forming clinoforms (Xue et al ., ; Eidam et al ., ; Liu et al ., ).…”

Section: Study Areamentioning

confidence: 99%

“…Annual water discharge ca 550 km 3 year À1 Water discharge at Phnom Penh (October) 36 700 m 3 sec À1 Water discharge at Phnom Penh (May) 2220 m 3 sec À1 Seasonal water level fluctuation at Phnom Penh 6 to 10 m Tidal processes Mean tidal range at the river mouth 2Á5 AE 0Á1 m Maximum tidal range at the river mouth 3Á2 to 3Á8 m Wave processes Monthly mean significant wave height (November to March) 0Á8 to 1Á2 m Monthly mean significant wave height (May to September) 0Á5 to 0Á6 m Vinh et al, 2016;McLachlan et al, 2017;Xing et al, 2017). The dry season is characterized by limited fluvial sediment supply with landward sediment import due to tidal processes; suspended-sediment concentration is low (<50 mg/ l) in the upstream part of the delta and high (reaching values >500 mg/l) in the downstream part ( Fig.…”

Section: Fluvial Processesmentioning

confidence: 99%

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Sediment distribution and depositional processes along the fluvial to marine transition zone of the Mekong River delta, Vietnam

Gugliotta

Saito

Nguyen³

et al. 2018

Sedimentology

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The area of coastal rivers with a combination of fluvial, tidal and wave processes is defined as the fluvial to marine transition zone and can extend up to several hundreds of kilometres upstream of the river mouth. The aim of this study is to improve the understanding of sediment distribution and depositional processes along the fluvial to marine transition zone using a comprehensive dataset of channel bed sediment samples collected from the Mekong River delta. Six sediment types were identified and were interpreted to reflect the combined action of fluvial and marine processes. Based on sediment‐type associations, the Mekong fluvial to marine transition zone could be subdivided into an upstream tract and a downstream tract; the boundary between these two tracts is identified 80 to 100 km upstream of the river mouth. The upstream tract is characterized by gravelly sand and sand and occasional heterolithic rhythmites, suggesting bed‐load supply and deposition mainly controlled by fluvial processes with subordinate tidal influence. The downstream tract is characterized by heterolithic rhythmites with subordinate sand and mud, suggesting suspended‐load supply and deposition mainly controlled by tidal processes with subordinate fluvial influence. Sediment distributions during wet and dry seasons suggest significant seasonal changes in sediment dynamic and depositional processes along the fluvial to marine transition zone. The upstream tract shows strong fluvial depositional processes with subordinate tidal influence during the wet season and no deposition with weak fluvial and tidal processes during the dry season. The downstream tract shows strong coexisting fluvial and tidal depositional processes during the wet season and strong tidal depositional processes with negligible fluvial influence during the dry season. Turbidity maxima are present along the downstream tract of the fluvial to marine transition zone during both wet and dry seasons and are driven by a combination of fluvial, tidal and wave processes.

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Developing Software Package for 2D Modeling Hydrodynamics and Salinity Transport in Cu Lao Dung, Mekong Delta

Tran

2023

Advances in Research on Water Resources and Environmental Systems

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Analysis and numerical modeling of the flow and sand dynamics in the lower Song Hau channel, Mekong Delta

Cited by 29 publications

References 53 publications

Empirical Assessment Tool for Bathymetry, Flow Velocity and Salinity in Estuaries Based on Tidal Amplitude and Remotely-Sensed Imagery

Empirical Assessment Tool for Bathymetry, Flow Velocity and Salinity in Estuaries Based on Tidal Amplitude and Remotely-Sensed Imagery

Sediment distribution and depositional processes along the fluvial to marine transition zone of the Mekong River delta, Vietnam

Developing Software Package for 2D Modeling Hydrodynamics and Salinity Transport in Cu Lao Dung, Mekong Delta

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