Journal
OCEAN DYNAMICS
Volume 67, Issue 11, Pages 1495-1510Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10236-017-1097-5
Keywords
Kaolinite; Flocculation; Floc size distributions; Streamtube model; Laboratory experiment
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Funding
- Virginia Institute of Marine Science (VIMS) Student Research Grant
- Korea Institute of Ocean Science and Technology (KIOST) [774080]
- China Scholarship Council (CSC)
- State Key Program of National Natural Science of China [41230640, 51339005]
- National Natural Science Foundation of China [51409081]
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In estuaries and coastal waters, floc size and its statistical distributions of cohesive sediments are of primary importance, due to their effects on the settling velocity and thus deposition rates of cohesive aggregates. The development of a robust flocculation model that includes the predictions of floc size distributions (FSDs), however, is still in a research stage. In this study, a one-dimensional longitudinal (1-DL) flocculation model along a streamtube is developed. This model is based on solving the population balance equation to find the FSDs by using the quadrature method of moments. To validate this model, a laboratory experiment is carried out to produce an advection transport-dominant environment in a cylindrical tank. The flow field is generated by a marine pump mounted at the bottom center, with its outlet facing upward. This setup generates an axially symmetric flow which is measured by an acoustic Doppler velocimeter (ADV). The measurement results provide the hydrodynamic input data required for this 1-DL model. The other measurement results, the FSDs, are acquired by using an automatic underwater camera system and the resulting images are analyzed to validate the predicted FSDs. This study shows that the FSDs as well as their representative sizes can be efficiently and reasonably simulated by this 1-DL model.
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