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Large-eddy simulations of a sediment plume released by a dredger using overflow
Decrop, B.; Sas, M.; De Mulder, T.; Toorman, E.A. (2018). Large-eddy simulations of a sediment plume released by a dredger using overflow. Journal of Applied Water Engineering and Research 6(1): 62-69. https://hdl.handle.net/10.1080/23249676.2016.1209441
In: Journal of Applied Water Engineering and Research. Taylor & Francis: London. ISSN 2324-9676, more
Peer reviewed article  

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Keyword
    Marine
Author keywords
    Trailer Suction Hopper Dredgers; turbidity plumes; large-eddysimulation; computational fluid dynamics

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Abstract
    Sediment plume predictions are part of the assessment of environmental impacts of dredging. The main source of turbidity while employing Trailer Suction Hopper Dredgers is the release of excess water through the overflow shaft. The near-field plume dynamics below and directly behind the sailing hopper dredgers arc traditionally unknown during predictions of far-field plume dispersion. Indeed, an accurate input of the vertical and horizontal distributions of sediment at the source location is important to obtain reliable results at environmentally sensitive areas further away. In this paper, a computational fluid dynamics model is presented as a tool to determine the three -dimensional flows of water, sediment and air bubbles directly after release from the overflow shaft. The full dredger hull geometry and an actuator disc accounting for propeller action arc included. It is shown that the model can reproduce two different cases of overflow plumes measured in the field with fair accuracy.

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