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2024-11-27
Determination of Settling Velocity for Cohesive Sediments Using a Settling Column Experiment—Case Study: Ca Mau, Vietnam
Authors
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Tran Xuan Dung
1. Department of Oceanology, Meteorology and Hydrology, Faculty of Physics – Engineering Physics, University of Science, Ho Chi Minh City, 700000, Vietnam; 2. Viet Nam National University, Ho Chi Minh City, 700000, Vietnam
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Le Nguyen Hoa Tien
1. Department of Oceanology, Meteorology and Hydrology, Faculty of Physics – Engineering Physics, University of Science, Ho Chi Minh City, 700000, Vietnam; 2. Viet Nam National University, Ho Chi Minh City, 700000, Vietnam
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Vo Luong Hong Phuoc
1. Department of Oceanology, Meteorology and Hydrology, Faculty of Physics – Engineering Physics, University of Science, Ho Chi Minh City, 700000, Vietnam; 2. Viet Nam National University, Ho Chi Minh City, 700000, Vietnam
DOI:
https://doi.org/10.30564/jees.v6i3.7188Abstract
The settling velocity (Ws) is a fundamental parameter in sediment dynamics, particularly in the coastal zones as estuarine and mangrove ecosystems, where various physical processes interact to influence sediment transport and deposition. Determining settling velocity is essential for understanding and predicting sediment transport, erosion–deposition processes in coastal environments. This study aims to determine the settling velocity and examines how sediment concentration affects settling velocity, using empirical models. The study applies these methods to compute the settling velocity of fine sediments in Ca Mau, Vietnam, which were collected in the Song Doc area (Western) in August 2014 and Rach Goc area (Eastern) in August 2015. The particle size analysis results indicate that the sediment samples from Western Ca Mau are coarser than those from Eastern Ca Mau, with sand ratios of 42.78% and 7.08% at the outer station, and 19.09% and 4.39% at the mangroves, respectively. The results also show that the average settling velocity of the sediment samples from Western Ca Mau is higher than that of the samples from Eastern Ca Mau. Specifically, the settling velocity in Western Ca Mau is 2.80 × 10−4 m s–1 at the outer station and 1.68 × 10−4 m s–1 at the mangroves. Meanwhile, in Eastern Ca Mau, the settling velocity of the sediment samples is 1.99 × 10−4 m s–1 at the outer station and 1.42 × 10−4 m s–1 at the mudflat-mangrove. Hence, it can be seen that the settling velocity of cohesive sediments corresponds well with the sediment’s particle size.
Keywords:
Settling Velocity; Cohesive Sediment; Particle Grain Size; Ca MauReferences
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Xuan Dung , T., Nguyen Hoa Tien , L., & Luong Hong Phuoc , V. (2024). Determination of Settling Velocity for Cohesive Sediments Using a Settling Column Experiment—Case Study: Ca Mau, Vietnam. Journal of Environmental & Earth Sciences, 6(3), 261–272. https://doi.org/10.30564/jees.v6i3.7188
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Copyright © 2024 Tran Xuan Dung , Le Nguyen Hoa Tien , Vo Luong Hong Phuoc
This is an open access article under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License.
