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Field Investigations of Underwater Mounds Formed by Hopper Dredge Discharges in a Coastal Environment
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China.
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China. Nanjing Hydraulic Research Institute, Nanjing 210029, China.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China. Nanjing Hydraulic Research Institute, Nanjing 210029, China.
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2020 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 8, no 6, article id 395Article in journal (Refereed) Published
Abstract [en]

In a coastal environment, this paper investigated the formation process and the cumulative shape of subaqueous mounds formed by hopper dredged discharges. Hydrological observations and field tests were performed to examine the flow features and ultimately generated morphology characteristics. A high-precision digital elevation model (DEM) was established by multi-beam depth sweeping (MBDS) in the experiment. Particular attention was paid to the formation of the mounds, the three-dimensional shape and the influence factors. The field measurements showed that the mounds were roughly symmetrical in space, and the tidal current, though of weak strength, played a certain role in shaping the profiles. Cone and volcanic cone mound tops were observed, featuring the main top shapes. The height and covered area of the mounds were proportional to the amount of dumped sediment, and they were also affected a lot by the water depth. The results of superimposed tests showed that the second placement over the existing mound resulted in a similar overall shape, but there was pronounced movement around the mound; additional discharged volumes at the same location mainly increased the mound height. The field tests provided a reference for understanding the sediment dumping in other similar coastal areas.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 8, no 6, article id 395
Keywords [en]
hydrological observations, experimental test, subaqueous sediment mounds, morphology features
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-79066DOI: 10.3390/jmse8060395ISI: 000550868200001Scopus ID: 2-s2.0-85087457803OAI: oai:DiVA.org:ltu-79066DiVA, id: diva2:1433256
Note

Validerad;2020;Nivå 2;2020-07-09 (johcin)

Available from: 2020-05-29 Created: 2020-05-29 Last updated: 2022-06-01Bibliographically approved

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Xie, Qiancheng

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