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Understanding the Settling Processes of Dredged Sediment Disposed in Open Waters through Experimental Tests and Numerical Simulations
Nanjing Hydraulic Research Institute, Nanjing 210029, China.
Nanjing Hydraulic Research Institute, Nanjing 210029, China; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-0820-617X
Nanjing Hydraulic Research Institute, Nanjing 210029, China; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China.
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2022 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 10, no 2, article id 220Article in journal (Refereed) Published
Abstract [en]

During dredging for subsea tunnels and pipelines, the dredged soil is typically dumped in a designated area. Understanding the settling behaviors of the dumped particles is essential for an accurate prediction of the resulting morphology. This study dealt with the settling processes in the open-water column by means of experimental tests and numerical simulations. Both quiescent and ambient current conditions were taken into account. Particular attention was paid to the induced flow patterns, descent sediment movement features and the resulting topography. Regarding the diffusion width and settling velocity, three key effect factors, i.e., dumped volume, particle size and ambient flow strength, were considered. The results show that the dumped sediment in the water forms a particle cloud, and two vortices with opposite rotations occur on both sides of the cloud. During settlement, three stages corresponding to convective descent, dynamic collapse and passive diffusion are observed. Most of the descending sediment is incorporated in a spherical vortex, resembling an upside-down mushroom cloud, and some sediment is also contained in an irregular trailing stem. The dumped particles exhibit initial acceleration, and then they slow down to converge to a fixed value. Subjected to the ambient currents, the initial acceleration phase is prolonged, and the vortex is somewhat distorted; the particle cloud is also advected downstream with a velocity roughly equal to the ambient current.

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 10, no 2, article id 220
Keywords [en]
Experimental tests, Flow patterns, Modeling, Sediment dumping, Settling processes
National Category
Water Engineering
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-89125DOI: 10.3390/jmse10020220ISI: 000773057600001Scopus ID: 2-s2.0-85124319490OAI: oai:DiVA.org:ltu-89125DiVA, id: diva2:1635703
Note

Validerad;2022;Nivå 2;2022-02-15 (hanlid);

Funder: China National Key Research and Development project (2019YFB1600700); Macau Science and Technology Development Fund (0089/2020/A); Swedish StandUp for Energy project

Available from: 2022-02-07 Created: 2022-02-07 Last updated: 2022-07-04Bibliographically approved

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Xie, Qiancheng

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