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Understanding the S...
Understanding the Settling Processes of Dredged Sediment Disposed in Open Waters through Experimental Tests and Numerical Simulations
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- Ding, Wei (author)
- Nanjing Hydraulic Research Institute, Nanjing 210029, China
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- Lu, Chuanteng (author)
- Nanjing Hydraulic Research Institute, Nanjing 210029, China; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China
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- Xie, Qiancheng (author)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik
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- Luo, Xiaofeng (author)
- Nanjing Hydraulic Research Institute, Nanjing 210029, China; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China
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- Zhang, Gongjin (author)
- Nanjing Hydraulic Research Institute, Nanjing 210029, China
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(creator_code:org_t)
- 2022-02-07
- 2022
- English.
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In: Journal of Marine Science and Engineering. - : MDPI. - 2077-1312. ; 10:2
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Water Engineering (hsv//eng)
Keyword
- Experimental tests
- Flow patterns
- Modeling
- Sediment dumping
- Settling processes
- Strömningslära
- Fluid Mechanics
Publication and Content Type
- ref (subject category)
- art (subject category)
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