Nguyet-Minh N., Le T. D., Pham H. V., Vu H. T. D., Ouillon Sylvain, Nguyen T. C. (2025). Suspended sediment pattern along the Mekong Delta's west coast induced by strong southwest monsoon activities and extreme events. Marine Geology, 485, p. 107563 [13 p.]. ISSN 0025-3227.
Titre du document
Suspended sediment pattern along the Mekong Delta's west coast induced by strong southwest monsoon activities and extreme events
Nguyet-Minh N., Le T. D., Pham H. V., Vu H. T. D., Ouillon Sylvain, Nguyen T. C.
Source
Marine Geology, 2025,
485, p. 107563 [13 p.] ISSN 0025-3227
Coastal suspended sediment dynamics and distributions are driven by complex forces and factors mainly related to wind-wave, currents and tide actions which resuspend unconsolidated sediment in the water-seabed layer and/or rework sediment in the seabed. Understanding the suspended sediment dynamics and their time- and space distribution are prominent issues for better understanding sediment transport processes, and morphological changes. Reliable estimated values of suspended sediment concentration (SSC) are key values for reliable modeling of coastal sediment transport. This study aims to investigate the spatial-temporal distribution of SSC along the west coast of the Vietnamese Mekong Delta forced by tides, currents and wind-wave factors which were generated during a strong activity of the southwest monsoon and extreme conditions caused by a tropical depression/storm circulation and thunderstorms. Our results showed that coastal currents and wind-wave actions mainly drove the SSC distributions. During the 12-day field survey, a high-turbidity front existed parallel and close to the coast at an average distance of 5 km where water depths range from 2 to 5 m. This front was likely related to the longshore drift current system which was partly captured by field survey data. The mean SSC value over an area of 400 km2 was 80 mg/l, much larger than the values reported in numerical simulations or measurements elsewhere along the subaqueous Mekong Delta. This led to a requirement for reassessment and reanalysis of coastal sediment dynamics based on numerical models and this dataset will serve as an important benchmark for improving the performance of numerical models.
