3D CFD simulations of trailing suction hopper dredger plume mixing: Comparison with field measurements

A 3D computational fluid dynamics (CFD) model is used to simulate mixing of an overflow plume within 400 m from a trailing suction hopper dredger (TSHD). The simulations are compared with new field measurements. It is the first time simulations of overflow dredging plumes are compared in such detail...

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Vydáno v:	Marine pollution bulletin Ročník 88; číslo 1-2; s. 34 - 46
Hlavní autoři:	de Wit, Lynyrd, Talmon, A.M., van Rhee, C.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Kidlington Elsevier 15.11.2014
Témata:	Animal and plant ecology Animal, plant and microbial ecology Applied ecology Biological and medical sciences Computational fluid dynamics Computer Simulation Dredging Ecotoxicology, biological effects of pollution Environment environmental impact fluid mechanics Flux Fundamental and applied biological sciences. Psychology Geologic Sediments Hydrodynamics Imaging, Three-Dimensional Marine Marine and brackish environment Marine Biology Mathematical models mixing Models, Theoretical Plumes Sea water ecosystems Sedimentation Suction suspended sediment Synecology Three dimensional Trailing suction dredgers turbidity water pollution Marine environment Sediment Field measurements Environment impact Turbulent plume mixing Turbidity Environmental factor Dredging Plume Sediments Environmental impact Turbulent mixing
ISSN:	0025-326X, 1879-3363, 1879-3363
On-line přístup:	Získat plný text
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Popis
Shrnutí:	A 3D computational fluid dynamics (CFD) model is used to simulate mixing of an overflow plume within 400 m from a trailing suction hopper dredger (TSHD). The simulations are compared with new field measurements. It is the first time simulations of overflow dredging plumes are compared in such detail to field measurements this close to a TSHD. Seven cases with a large variety in overflow flux and plume characteristics are used. Measured maximum suspended sediment concentrations (SSC) vary between 30 and 500 mg/l and fluxes vary between 0.7% and 20% of the total overflow flux; the CFD model has, subject to the limitations of the field data, been shown to reproduce this in a satisfactory way. The model gives better understanding of important near field processes, which helps to assess the frequency, duration and intensity of stresses like turbidity and sedimentation needed to find the environmental impact of dredging projects.
Bibliografie:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0025-326X 1879-3363 1879-3363
DOI:	10.1016/j.marpolbul.2014.08.042