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Im, Jungho
Intelligent Remote sensing and geospatial Information Science Lab.
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Effects of seasonal variations on sediment-plume streaks from dredging operations

Author(s)
Kim, Nam-HoonPham, Van SyHwang, Jin HwanWon, Nam IlHa, Ho KyungIm, JunghoKim, Youngsung
Issued Date
2018-04
DOI
10.1016/j.marpolbul.2018.02.014
URI
https://scholarworks.unist.ac.kr/handle/201301/24155
Fulltext
https://www.sciencedirect.com/science/article/pii/S0025326X18300961?via%3Dihub
Citation
MARINE POLLUTION BULLETIN, v.129, no.1, pp.26 - 34
Abstract
When mixtures of aggregates and water dredged from the seabed are discharged at the surface into the adjacent water from a barge, coarse sediments sink immediately and fine sediments are suspended forming a plume. Recently, elongated plumes of fine sediment were observed by satellites near a dredging location on the continental shelf. Such plume streaks were longer in certain conditions with seasonality than expected or reported previously. Therefore, the present work studied the appearance of sediment plume with field measurements and numerical simulations and explains the seasonally varying restoring force and thicknesses of the surface mixed layer resulting from the vertical density distribution near the surface, along with mixing by hydrodynamic process. The resulting mixtures, after vertical restoring and mixing with the surroundings, determine the horizontal transport of suspended sediments. A numerical model successfully reproduced and explained the results from field measurements and satellite images along with the seasonal variations.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0025-326X
Keyword (Author)
DredgingPlumeRestoring forceStreakSuspended sediment
Keyword
COASTAL WATERSOCEAN MODELTRANSPORTSEASIMULATIONSCIRCULATIONTHERMALSKOREA

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