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Volume 31 (2024)
Volume 31, Issue 1
Pg 1 - 61 (June 2024)
Volume 30 (2023)
Volume 30, Issue 2
Pg 107 - 185 (December 2023)
Volume 30, Issue 1
Pg 1 - 105 (June 2023)
Volume 29 (2022)
Volume 29,
Pg 1 - 58 (December 2022)
Volume 28 (2022)
Volume 28,
Pg 1 - 58 (June 2022)
Volume 27 (2021)
Volume 27, Issue 2
Pg 67 - 90 (December 2021)
Volume 27, Issue 1
Pg 1 - 65 (September 2021)
Volume 26 (2021)
Volume 26, Issue 2
Pg 85 - 140 (June 2021)
Volume 26, Issue 1
Pg 1 - 84 (March 2021)
Volume 25 (2020)
Volume 25, Issue 2
Pg 67 - 140 (October 2020)
Volume 25, Issue 1
Pg 1 - 66 (July 2020)
Volume 24 (2020)
Volume 24, Issue 1-2
Pg 1 - 55 (April 2020)
Volume 23 (2019)
Volume 23, Issue 2
Pg 119 - 214 (October 2019)
Volume 23, Issue 1
Pg 1 - 118 (July 2019)
Volume 22 (2019)
Volume 22, Issue 2
Pg 101 - 204 (April 2019)
Volume 22, Issue 1
Pg 1 - 100 (January 2019)
Volume 21 (2018)
Volume 21, Issue 4
Pg 389 - 587 (October 2018)
Volume 21, Issue 3
Pg 279 - 388 (July 2018)
Volume 21, Issue 2
Pg 127 - 278 (April 2018)
Volume 21, Issue 1
Pg 1 - 125 (January 2018)
Volume 20 (2017)
Volume 20, Issue 4
Pg 457 - 625 (October 2017)
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Pg 335 - 456 (July 2017)
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Pg 1 - 209 (January 2017)
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Volume 19, Issue 4
Pg 725 - 937 (October 2016)
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Pg 1 - 201 (January 2016)
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Pg 135 - 283 (April 2015)
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Pg 1 - 134 (January 2015)
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Pg 163 - 251 (October 2014)
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Pg 1 - 98 (July 2014)
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Volume 15, Issue 2
Pg 101 - 208 (April 2014)
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Pg 1 - 100 (January 2014)
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Pg 147 - 283 (October 2013)
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Pg 1 - 74 (January 2013)
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Pg 1 - 80 (July 2012)
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Pg 1 - 72 (January 2012)
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Pg 1 - 76 (January 2011)
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Volume 5, Issue 2
Pg 107 - 218 (April 2009)
Volume 5, Issue 1
Pg 1 - 106 (January 2009)
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Volume 4, Issue 2
Pg 117 - 228 (October 2008)
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Pg 1 - 115 (July 2008)
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Volume 3, Issue 2
Pg 105 - 237 (April 2008)
Volume 3, Issue 1
Pg 1 - 103 (January 2008)
Volume 2 (2007)
Volume 2, Issue 2
Pg 117 - 238 (October 2007)
Volume 2, Issue 1
Pg 1 - 115 (July 2007)
Volume 1 (2007)
Volume 1, Issue 2
Pg 101 - 205 (April 2007)
Volume 1, Issue 1
Pg 1 - 100 (January 2007)
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Advances and Applications in Fluid Mechanics
Advances and Applications in Fluid Mechanics
Volume 5, Issue 2, Pages 107 - 153 (April 2009)
TIDALLY DRIVEN SEDIMENT TRANSPORT AND ITS IMPACT ON DREDGE LANES
J. N. Aldridge (UK) and S. G. Sajjadi (USA)
Abstract:
Tidal flows and suspended sediment transport associated with dredge tracks in dredging lanes, arising from aggregate extraction, is investigated. A computational fluid dynamics (CFD) model is used in order to simulate tidal flows and suspended sediment transport over bed features typical of aggregate extraction dredging. This model includes (a) pressure-gradient forcing, and (b) enables rough boundaries to be simulated. A sediment-transport module involving resuspension, transport and deposition is also developed, thereby allowing budgets of material to be computed. Model results have been compared with analytical solutions and previous CFD models over flat beds and favourable agreement is achieved. The present CFD model is shown to be capable of describing the velocity flows within complex areas of morphology such as found in aggregate extraction areas. These flows fields have been utilised within numerical suspended sediment models to predict re-suspension and deposition of sediment within the model domain. The results of the CFD simulations clearly indicate a mechanism for retention of sands by dredge tracks, arising from the reduced bed shear stress within the tracks compared to the surrounding higher flat regions. It is shown that this mechanism appear to be (i) relatively insensitive to track orientation with respect to the main tidal axis, (ii) is size selective, preferentially trapping coarser particles. The preliminary practical implications of this work are that suspended sediment transport associated with the dredge track is relatively insensitive to the orientation of the dredge tracks compared to the principal tidal axis. Some aspects of dredge track morphology are probably more significant, and in particular, isolated dredge tracks with a large depth/width ratio (i.e., deep and narrow) are more likely to accumulate sediment than tracks with a small depth/width ratio (i.e., shallow and wide).
Keywords and phrases:
tidal flows, sediment transport, CFD, dredging.
Communicated by K. K. Azad
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P-ISSN: 0973-4686
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