Journal ArticleDOI
Effects of Groyne Layout on the Flow in Groyne Fields: Laboratory Experiments
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In this paper, the effects of various groyne shapes on the flow in a Groyne field were tested in a physical model of a schematized river reach, geometrically scaled 1:40 by measuring velocities using particle tracking velocimetry.Abstract:
This research is aimed at finding efficient alternative designs, in the physical, economical, and ecological sense, for the standard groynes as they are found in the large rivers of Europe In order to test the effects of various groyne shapes on the flow in a groyne field, experiments were performed in a physical model of a schematized river reach, geometrically scaled 1:40 Four different types of schematized groynes were tested, all arranged in an array of five identical groyne fields, ie, standard reference groynes, groynes with a head having a gentle slope and extending into the main channel, permeable groynes consisting of pile rows, and hybrid groynes consisting of a lowered impermeable groyne with a pile row on top Flow velocities were measured using particle tracking velocimetry The design of the experiment was such that the cross-sectional area blocked by the groyne was the same in all cases Depending on the groyne head shape and the extent of submergence variations in the intensity of vortex shedding and recirculation in the groyne field were observed The experimental data are used to understand the physical processes like vortex formation and detachment near the groyne head It is demonstrated that the turbulence properties near and downstream of the groyne can be manipulated by changing the permeability and slope of the groyne head It is also observed that for submerged conditions the flow becomes complex and locally dominated by three-dimensional effects, which will make it difficult to predict by applying depth average numerical models or by three-dimensional models with a coarse resolution in the vertical directionread more
Citations
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Journal ArticleDOI
Effects of ocean sprawl on ecological connectivity: impacts and solutions
Melanie J. Bishop,Mariana Mayer-Pinto,Laura Airoldi,Louise B. Firth,Rebecca L. Morris,Lynette H.L. Loke,Stephen J. Hawkins,Larissa A. Naylor,Ross A. Coleman,Su Yin Chee,Katherine A. Dafforn +10 more
TL;DR: The mechanisms by which ocean sprawl may modify ecological connectivity, including trophic connectivity associated with the flow of nutrients and resources are reviewed, revealing the paucity of studies directly addressing the effects of artificial structures on ecological connectivity in the marine environment, particularly at large spatial and temporal scales.
Journal ArticleDOI
Identifying the consequences of ocean sprawl for sedimentary habitats
Eliza C. Heery,Melanie J. Bishop,Lincoln P. Critchley,Ana B. Bugnot,Laura Airoldi,Mariana Mayer-Pinto,Emma V. Sheehan,Ross A. Coleman,Lynette H.L. Loke,Emma L. Johnston,Valeriya Komyakova,Rebecca L. Morris,Elisabeth M. A. Strain,Larissa A. Naylor,Katherine A. Dafforn +14 more
TL;DR: The importance for comprehensive monitoring using robust survey designs is highlighted and research strategies needed to understand, value, and protect marine sedimentary ecosystems in the face of a rapidly changing environment are outlined.
Journal ArticleDOI
Numerical Investigation of Flow Hydrodynamics in a Channel with a Series of Groynes
TL;DR: In this paper, the flow hydrodynamics in a straight open channel containing a multiple-embayment groyne field on one of its sides is investigated numerically using large eddy simulation.
Journal ArticleDOI
Experiments on Mass Exchange between Groin Fields and Main Stream in Rivers
Volker Weitbrecht,Volker Weitbrecht,Scott A. Socolofsky,Scott A. Socolofsky,Gerhard H. Jirka,Gerhard H. Jirka +5 more
TL;DR: In this paper, the exchange process between a river and dead-water zones created by groin fields is modeled using particle image velocimetry (PIV) at the water surface to capture the dynamics of the flow field and planar concentration analysis (PCA) to determine the depth integrated mass fluxes of dissolved tracer.
Journal ArticleDOI
3D simulation of flow around a single spur dike with free-surface flow
TL;DR: In this paper, flow patterns around a single spur dike (also termed a groyne) with free-surface flow was simulated using a numerical model known as Fluent.
References
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Journal ArticleDOI
Fluid mechanics in the driven cavity
P. N. Shankar,M. D. Deshpande +1 more
TL;DR: In this article, a review of the body of work dealing with internal recirculating flows generated by the motion of one or more of the containing walls is presented. But the use of direct numerical simulation appears very promising.
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Habitat requirements of Atlantic salmon and brown trout in rivers and streams
TL;DR: It is prudent to accept that although manipulations of habitat may appear to be beneficial when considered locally, they should be measured and assessed where possible in terms of the production of returning adults and/or high quality smolts.
Journal ArticleDOI
Exchange Processes between a River and Its Groyne Fields: Model Experiments
Wim S. J. Uijttewaal,Wim S. J. Uijttewaal,D.C. Lehmann,D.C. Lehmann,A. van Mazijk,A. van Mazijk +5 more
TL;DR: In this paper, the exchange process between a groyne field and the main stream itself is examined and validated using a dead-zone prediction model, which treats the exchange as a first-order system.
Book
Principles of river engineering: The non-tidal alluvial river
TL;DR: In this article, the non-tidal alluvial river is considered and the principles of river engineering are discussed, including the nontidal river engineering principles, and the importance of water flow in river engineering.
Journal ArticleDOI
Erosion of Sand Beds around Spur Dikes
TL;DR: In this article, it is shown that a simple kinematic model for erosion of sand beds in a long contraction, first proposed by Straub, can be modified for application to erosion around spur dikes.
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