This page has only limited features, please log in for full access.

Unclaimed
Alan Cuthbertson
School of Science and Engineering, University of Dundee, Dundee DD1 4HN, United Kingdom

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 01 March 2021 in Physics of Fluids
Reads 0
Downloads 0

A large-scale experimental study has been conducted at the Coriolis Rotating Platform to investigate the dynamics of uni- and bi-directional exchange flows along a channel with a trapezoidal cross section under the influence of background rotation. High-resolution two-dimensional particle image velocimetry and micro-conductivity probes were used to obtain detailed velocity fields and density profiles of the exchange flow generated across the channel under different parametric conditions. Experimental measurements give new insight into the stratified-flow dynamics dependence on the magnitude of Burger number, defined as the ratio of the Rossby radius to the channel width, such that values lower than 0.5 characterize unsteady exchange flows. The measurements highlight the role that both ambient rotation and net-barotropic forcing have on the geostrophic adjustment of the dense outflowing layer and on the corresponding counter-flowing water layer fluxes. The coupled effect of these two parametric conditions largely affects the transverse velocity distribution and, for the largest net-barotropic flow in the upper fresh water layer, leads to the partial blockage of the lower saline outflow. Moreover, an increase in the mixing layer thickness, associated with larger rotation rates, and due the interface dynamics, is observed, with shear-driven interfacial instabilities analyzed to highlight the influence of both ambient rotation and net-barotropic forcing.

ACS Style

Maria Chiara De Falco; Claudia Adduce; Alan Cuthbertson; Maria Eletta Negretti; Janek Laanearu; Daniela Malcangio; Joel Sommeria. Experimental study of uni- and bi-directional exchange flows in a large-scale rotating trapezoidal channel. Physics of Fluids 2021, 33, 036602 .

AMA Style

Maria Chiara De Falco, Claudia Adduce, Alan Cuthbertson, Maria Eletta Negretti, Janek Laanearu, Daniela Malcangio, Joel Sommeria. Experimental study of uni- and bi-directional exchange flows in a large-scale rotating trapezoidal channel. Physics of Fluids. 2021; 33 (3):036602.

Chicago/Turabian Style

Maria Chiara De Falco; Claudia Adduce; Alan Cuthbertson; Maria Eletta Negretti; Janek Laanearu; Daniela Malcangio; Joel Sommeria. 2021. "Experimental study of uni- and bi-directional exchange flows in a large-scale rotating trapezoidal channel." Physics of Fluids 33, no. 3: 036602.

Original article
Published: 18 February 2021 in Environmental Fluid Mechanics
Reads 0
Downloads 0

This paper presents new laboratory-scale numerical simulations of density-driven exchange flows generated across an idealised, submerged sill obstruction under both non-rotating and rotating frames of reference using the Bergen Ocean Model (BOM), a three-dimensional general ocean circulation model. Initial non-rotating BOM simulations are compared directly with previous laboratory data obtained in a large-scale channel facility incorporating an idealised trapezoidal sill. These laboratory experiments demonstrate that the saline intrusion flux across the sill is initially reduced and then eventually fully blocked under increasing net-barotropic flow conditions imposed in the counterflowing upper freshwater layer, with the saline blockage also more evident for reduced sill submergence depths. These parametric dependences are also demonstrated in the equivalent BOM simulations of the non-rotating sill exchange flows, although the numerical model results tend to overpredict both the interfacial velocity and density gradients across the sill (as indicative of suppressed interfacial mixing), as well as the fresh-saline source flux ratio at which full blockage of the saline intrusion occurs. The BOM simulations are then extended to consider rotating sill exchange flow dynamics. In particular, these additional runs demonstrate that Coriolis forces increase the overall blockage of the saline intrusion layer compared to equivalent non-rotating exchange flows, especially when the Rossby number associated with the saline intrusion flow across the sill is considerably less than unity. This effect is largely attributed to the development of Ekman boundary layer dynamics and associated secondary circulations within the bi-directional exchange flows. These are shown to impose strong control on the transverse distribution and extent of the lower saline intrusion flow across the sill and, hence, the parametric conditions under which full saline intrusion blockage is achieved in rotating sill exchange flows.

ACS Style

A. Cuthbertson; J. Berntsen; J. Laanearu; Magdeli Asplin. Rotational effects on exchange flows across a submerged sill. Environmental Fluid Mechanics 2021, 21, 405 -432.

AMA Style

A. Cuthbertson, J. Berntsen, J. Laanearu, Magdeli Asplin. Rotational effects on exchange flows across a submerged sill. Environmental Fluid Mechanics. 2021; 21 (2):405-432.

Chicago/Turabian Style

A. Cuthbertson; J. Berntsen; J. Laanearu; Magdeli Asplin. 2021. "Rotational effects on exchange flows across a submerged sill." Environmental Fluid Mechanics 21, no. 2: 405-432.

Journal article
Published: 28 January 2021 in Journal of Hydrology
Reads 0
Downloads 0

Natural river channels that are sediment supply limited due to upstream water management practices and/or flow regulation are often subject to in-channel bed degradation and bed surface restructuring during natural flood hydrographs or controlled flow releases from upstream dams. The heterogeneity of sediment sizes present in these channels means that different size classes are transported more actively during different parts of the hydrograph. A series of laboratory experiments is conducted to investigate the in-channel response of a graded sediment bed to a range of design flow hydrographs when no sediment is supplied at the upstream boundary. The results show varying temporal lag and bed load transport hysteresis for different transported fractions, defined by fine, medium and coarse size classes in the graded sediment mixture. The coarse size class typically exhibits clockwise hysteresis, indicating more active transport during the rising hydrograph limb, whereas the fine size class demonstrates either no/mixed or counterclockwise hysteresis, as it becomes more active during the falling limb. On this separate limb basis, predictions of fractional bed load transport rates are improved by calculating unique reference threshold shear stresses for each size class at the initiation and cessation of fractional grain motions on the rising and falling limbs, respectively. Corresponding temporal variations in the bed load median grain size vary depending on the hydrograph total water work and unsteadiness, with peak values generally attained during the rising limb and overall bed load fining observed during the falling limb. Analysis of the three size classes also indicates that the medium-coarse and fine fractions are transported in larger relative proportions during smaller magnitude, more flashy hydrographs and larger magnitude, flatter hydrographs, respectively. The resulting armouring of the post-hydrograph bed surface layer is most significant at the upstream end of the channel and decreases exponentially in the downstream direction. Two empirical models, based on combined hydrograph and bed sediment descriptors, are also shown to predict reasonably well the overall bed load yields generated under different flow hydrographs from the satisfactory collapse of the current experimental data and previous datasets for both uniform and graded bed sediments. These bed load yields provide an empirical means to describe the extent of upstream bed armouring and the downstream fining of the bed surface layer after the passage of individual hydrographs.

ACS Style

Le Wang; Alan J.S. Cuthbertson; Shang Hong Zhang; Gareth Pender; An Ping Shu; Yong Qiang Wang. Graded bed load transport in sediment supply limited channels under unsteady flow hydrographs. Journal of Hydrology 2021, 595, 126015 .

AMA Style

Le Wang, Alan J.S. Cuthbertson, Shang Hong Zhang, Gareth Pender, An Ping Shu, Yong Qiang Wang. Graded bed load transport in sediment supply limited channels under unsteady flow hydrographs. Journal of Hydrology. 2021; 595 ():126015.

Chicago/Turabian Style

Le Wang; Alan J.S. Cuthbertson; Shang Hong Zhang; Gareth Pender; An Ping Shu; Yong Qiang Wang. 2021. "Graded bed load transport in sediment supply limited channels under unsteady flow hydrographs." Journal of Hydrology 595, no. : 126015.

Journal article
Published: 25 January 2021 in Water
Reads 0
Downloads 0

Cage-based aquaculture has been growing rapidly in recent years. In some locations, cage-based aquaculture has resulted in the clustering of large quantities of cages in fish farms located in inland lakes or reservoirs and coastal embayments or fjords, significantly affecting flow and mass transport in the surrounding waters. Existing studies have focused primarily on the macro-scale flow blockage effects of fish cages, and the complex wake flow and associated near-field mass transport in the presence of the cages remain largely unclear. As a first step toward resolving this knowledge gap, this study employed the combined Particle Image Velocimetry and Planar Laser Induced Fluorescence (PIV-PLIF) flow imaging technique to measure turbulence characteristics and associated mass transport in the near wake of a steady current through an aquaculture cage net panel in parametric flume experiments. In the near-wake region, defined as ~3M (mesh size) downstream of the net, the flow turbulence was observed to be highly inhomogeneous and anisotropic in nature. Further downstream, the turbulent intensity followed a power-law decay after the turbulence production region, albeit with a decay exponent much smaller than reported values for analogous grid-generated turbulence. Overall, the presence of the net panel slightly enhanced the lateral spreading of the scalar plume, but the lateral distribution of the scalar concentration, concentration fluctuation and transverse turbulent scalar flux exhibited self-similarity from the near-wake region where the flow was still strongly inhomogeneous. The apparent turbulent diffusivity estimated from the gross plume parameters was found to be in reasonable agreement with the Taylor diffusivity calculated as the product of the transverse velocity fluctuation and integral length scale, even when the plume development was still transitioning from a turbulent-convective to turbulent-diffusive regime. The findings of this study provide references to the near-field scalar transport of fish cages, which has important implications in the assessment of the environmental impacts and environmental carrying capacity of cage-based aquaculture.

ACS Style

Dongdong Shao; Li Huang; Ruo-Qian Wang; Carlo Gualtieri; Alan Cuthbertson. Flow Turbulence Characteristics and Mass Transport in the Near-Wake Region of an Aquaculture Cage Net Panel. Water 2021, 13, 294 .

AMA Style

Dongdong Shao, Li Huang, Ruo-Qian Wang, Carlo Gualtieri, Alan Cuthbertson. Flow Turbulence Characteristics and Mass Transport in the Near-Wake Region of an Aquaculture Cage Net Panel. Water. 2021; 13 (3):294.

Chicago/Turabian Style

Dongdong Shao; Li Huang; Ruo-Qian Wang; Carlo Gualtieri; Alan Cuthbertson. 2021. "Flow Turbulence Characteristics and Mass Transport in the Near-Wake Region of an Aquaculture Cage Net Panel." Water 13, no. 3: 294.

Review
Published: 25 October 2020 in Water
Reads 0
Downloads 0

While marine aquaculture, or mariculture, has been growing rapidly and globally in recent decades, many environmental concerns remain to be fully addressed to achieve its long-term goal of sustainable development. This paper aims to provide a synthesized perspective on these issues by reviewing and discussing the characterization, transport, and current modelling and management tools associated with effluents released from mariculture sites. Specifically, we examined the effluent characteristics and behavior from source-to-sink, including the composition and load of effluent discharge, its transport and transformation processes in the water column and at the seabed, and its impacts on the pelagic and benthic environments. We then focused on management-related issues, including the setting of the regulatory mixing zone, the establishment of environmental standards, monitoring measures, and modelling techniques to depict the current state-of-the-art modes in a global context. Our study shows that while substantial progress has been made in understanding the nature of the mariculture effluent, as well as in monitoring and modelling its transport and fate, the regulatory framework still lags behind in many countries where the mariculture industry is relevant. This is particularly evident in the lack of consistent criteria for the definition of regulatory mixing zones and the associated environmental standards for water quality and benthic impacts. Besides, as new predictive models are emerging quickly, their proper evaluation and validation are imperative in view of their increasing application in regulatory practices. This review is intended to provide references for advancing regulatory management of mariculture effluents, as well as for promoting sustainable mariculture development.

ACS Style

Xinyan Wang; Alan Cuthbertson; Carlo Gualtieri; Dongdong Shao. A Review on Mariculture Effluent: Characterization and Management Tools. Water 2020, 12, 2991 .

AMA Style

Xinyan Wang, Alan Cuthbertson, Carlo Gualtieri, Dongdong Shao. A Review on Mariculture Effluent: Characterization and Management Tools. Water. 2020; 12 (11):2991.

Chicago/Turabian Style

Xinyan Wang; Alan Cuthbertson; Carlo Gualtieri; Dongdong Shao. 2020. "A Review on Mariculture Effluent: Characterization and Management Tools." Water 12, no. 11: 2991.

Journal article
Published: 10 December 2019 in Journal of Hydraulic Research
Reads 0
Downloads 0
ACS Style

Daniela Malcangio; Alan Cuthbertson; Mouldi Ben Meftah; Michele Mossa. Computational simulation of round thermal jets in an ambient cross flow using a large-scale hydrodynamic model. Journal of Hydraulic Research 2019, 58, 920 -937.

AMA Style

Daniela Malcangio, Alan Cuthbertson, Mouldi Ben Meftah, Michele Mossa. Computational simulation of round thermal jets in an ambient cross flow using a large-scale hydrodynamic model. Journal of Hydraulic Research. 2019; 58 (6):920-937.

Chicago/Turabian Style

Daniela Malcangio; Alan Cuthbertson; Mouldi Ben Meftah; Michele Mossa. 2019. "Computational simulation of round thermal jets in an ambient cross flow using a large-scale hydrodynamic model." Journal of Hydraulic Research 58, no. 6: 920-937.

Journal article
Published: 05 July 2019 in Water Resources Research
Reads 0
Downloads 0

Flume experiments are conducted to investigate the intrinsic links between time‐varying bed load transport properties for uniform sediments and bed surface morphology under unsteady hydrograph flows, in the absence of upstream sediment supply. These conditions are representative of regulated river reaches (e.g. downstream of a dam) that are subject to natural flood discharges or managed water releases, resulting in net degradation of the river bed. The results demonstrate that the hydrograph magnitude and unsteadiness have significant impacts on sediment transport rates and yields, as well as hysteresis patterns and yield ratios generated during the rising and falling limbs. A new hydrograph descriptor combining the influence of total water work and unsteadiness on bed load transport is shown to delineate these hysteresis patterns and yield ratios, whilst correlating strongly with overall sediment yields. This provides an important parametric link between unsteady hydrograph flow conditions, bed load transport and bed surface degradation under imposed zero sediment feed conditions. As such, maximum bed erosion depths and the longitudinal bed degradation profiles along the flume, are strongly dependent on the magnitude of this new hydrograph descriptor. Similarly, non‐equilibrium bed forms generated along the flume indicate that formative conditions for alternate bars, mixed bar/dunes or dunes are defined reasonably well by an existing morphological model and the new hydrograph descriptor. These findings provide a new framework for improved predictive capabilities for sediment transport and morphodynamic response in regulated rivers to natural or imposed unsteady flows, while their wider application to graded sediments are also considered.

ACS Style

Le Wang; Alan Cuthbertson; Gareth Pender; Deyu Zhong. Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs. Water Resources Research 2019, 55, 5431 -5452.

AMA Style

Le Wang, Alan Cuthbertson, Gareth Pender, Deyu Zhong. Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs. Water Resources Research. 2019; 55 (7):5431-5452.

Chicago/Turabian Style

Le Wang; Alan Cuthbertson; Gareth Pender; Deyu Zhong. 2019. "Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs." Water Resources Research 55, no. 7: 5431-5452.

Journal article
Published: 01 February 2018 in Coastal Engineering
Reads 0
Downloads 0
ACS Style

Alan Cuthbertson; Farzin Samsami; Ping Dong. Model studies for flocculation of sand-clay mixtures. Coastal Engineering 2018, 132, 13 -32.

AMA Style

Alan Cuthbertson, Farzin Samsami, Ping Dong. Model studies for flocculation of sand-clay mixtures. Coastal Engineering. 2018; 132 ():13-32.

Chicago/Turabian Style

Alan Cuthbertson; Farzin Samsami; Ping Dong. 2018. "Model studies for flocculation of sand-clay mixtures." Coastal Engineering 132, no. : 13-32.

Journal article
Published: 01 April 2017 in Water Management
Reads 0
Downloads 0
ACS Style

Alan J. S. Cuthbertson. Editorial. Water Management 2017, 170, 55 -56.

AMA Style

Alan J. S. Cuthbertson. Editorial. Water Management. 2017; 170 (2):55-56.

Chicago/Turabian Style

Alan J. S. Cuthbertson. 2017. "Editorial." Water Management 170, no. 2: 55-56.

Original article
Published: 23 March 2017 in Environmental Fluid Mechanics
Reads 0
Downloads 0

Results are presented from a series of large-scale experiments investigating the internal and near-bed dynamics of bi-directional stratified flows with a net-barotropic component across a submerged, trapezoidal, sill obstruction. High-resolution velocity and density profiles are obtained in the vicinity of the obstruction to observe internal-flow dynamics under a range of parametric forcing conditions (i.e. variable saline and fresh water volume fluxes; density differences; sill obstruction submergence depths). Detailed synoptic velocity fields are measured across the sill crest using 2D particle image velocimetry, while the density structure of the two-layer exchange flows is measured using micro-conductivity probes at several sill locations. These measurements are designed to aid qualitative and quantitative interpretation of the internal-flow processes associated with the lower saline intrusion layer blockage conditions, and indicate that the primary mechanism for this blockage is mass exchange from the saline intrusion layer due to significant interfacial mixing and entrainment under dominant, net-barotropic, flow conditions in the upper freshwater layer. This interfacial mixing is quantified by considering both the isopycnal separation of vertically-sorted density profiles across the sill, as well as calculation of corresponding Thorpe overturning length scales. Analysis of the synoptic velocity fields and density profiles also indicates that the net exchange flow conditions remain subcritical (G < 1) across the sill for all parametric conditions tested. An analytical two-layer exchange flow model is then developed to include frictional and entrainment effects, both of which are needed to account for turbulent stresses and saline entrainment into the upper freshwater layer. The experimental results are used to validate two key model parameters: (1) the internal-flow head loss associated with boundary friction and interfacial shear; and (2) the mass exchange from the lower saline layer into the upper fresh layer due to entrainment.

ACS Style

Alan Cuthbertson; Janek Laanearu; Magda Carr; Joel Sommeria; Samuel Viboud. Blockage of saline intrusions in restricted, two-layer exchange flows across a submerged sill obstruction. Environmental Fluid Mechanics 2017, 18, 27 -57.

AMA Style

Alan Cuthbertson, Janek Laanearu, Magda Carr, Joel Sommeria, Samuel Viboud. Blockage of saline intrusions in restricted, two-layer exchange flows across a submerged sill obstruction. Environmental Fluid Mechanics. 2017; 18 (1):27-57.

Chicago/Turabian Style

Alan Cuthbertson; Janek Laanearu; Magda Carr; Joel Sommeria; Samuel Viboud. 2017. "Blockage of saline intrusions in restricted, two-layer exchange flows across a submerged sill obstruction." Environmental Fluid Mechanics 18, no. 1: 27-57.

Journal article
Published: 28 October 2016 in Water
Reads 0
Downloads 0

Soil erosion and deposition mechanisms play a crucial role in the sustainability of both existing reservoirs and newly planned projects. Soil erosion is one of the most important factors influencing sediment transport yields, and, in the context of existing reservoirs, the surrounding watersheds supply both runoff and sediment yield to the receiving water body. Therefore, appropriate land management strategies are needed to minimize the influence of sediment yields on reservoir volume and, hence, the capacity of power generation. In this context, soil erosion control measures such as buffer strips may provide a practical and low-cost option for large reservoirs, but need to be tested at the catchment scale. This paper represents a study case for the Itumbiara hydroelectric power plant (HPP) in Brazil. Four different scenarios considering radially planted buffer strips of Vetivergrass with widths of 20 m, 40 m, 100 m and 200 m are analyzed. A semi-distributed hydrological model, SWAT, was used to perform the simulations. Results indicate a reduction of sediments transported to the reservoir of between 0.2% and 1.0% per year is possible with buffer strip provision, and that this reduction, over the life of Itumbiara HPP, may prove important for lengthening the productivity of the plant.

ACS Style

Marta Luz; Lindsay C. Beevers; Alan J. S. Cuthbertson; Gabriela M. Medero; Viviane S. Dias; Diego T. F. Nascimento. The Mitigation Potential of Buffer Strips for Reservoir Sediment Yields: The Itumbiara Hydroelectric Power Plant in Brazil. Water 2016, 8, 489 .

AMA Style

Marta Luz, Lindsay C. Beevers, Alan J. S. Cuthbertson, Gabriela M. Medero, Viviane S. Dias, Diego T. F. Nascimento. The Mitigation Potential of Buffer Strips for Reservoir Sediment Yields: The Itumbiara Hydroelectric Power Plant in Brazil. Water. 2016; 8 (11):489.

Chicago/Turabian Style

Marta Luz; Lindsay C. Beevers; Alan J. S. Cuthbertson; Gabriela M. Medero; Viviane S. Dias; Diego T. F. Nascimento. 2016. "The Mitigation Potential of Buffer Strips for Reservoir Sediment Yields: The Itumbiara Hydroelectric Power Plant in Brazil." Water 8, no. 11: 489.

Proceedings article
Published: 24 June 2016 in River Flow 2016
Reads 0
Downloads 0
ACS Style

Jonathan Kean; Alan Cuthbertson; Lindsay Beevers. Near-bed turbulence characteristics in unsteady hydrograph flows over mobile and immobile gravel beds. River Flow 2016 2016, 1 .

AMA Style

Jonathan Kean, Alan Cuthbertson, Lindsay Beevers. Near-bed turbulence characteristics in unsteady hydrograph flows over mobile and immobile gravel beds. River Flow 2016. 2016; ():1.

Chicago/Turabian Style

Jonathan Kean; Alan Cuthbertson; Lindsay Beevers. 2016. "Near-bed turbulence characteristics in unsteady hydrograph flows over mobile and immobile gravel beds." River Flow 2016 , no. : 1.

Journal article
Published: 25 May 2016 in Ocean Dynamics
Reads 0
Downloads 0
ACS Style

Alan J. S. Cuthbertson; Olugbenga Ibikunle; W. John McCarter; Gerard Starrs. Monitoring and characterisation of sand-mud sedimentation processes. Ocean Dynamics 2016, 66, 867 -891.

AMA Style

Alan J. S. Cuthbertson, Olugbenga Ibikunle, W. John McCarter, Gerard Starrs. Monitoring and characterisation of sand-mud sedimentation processes. Ocean Dynamics. 2016; 66 (6-7):867-891.

Chicago/Turabian Style

Alan J. S. Cuthbertson; Olugbenga Ibikunle; W. John McCarter; Gerard Starrs. 2016. "Monitoring and characterisation of sand-mud sedimentation processes." Ocean Dynamics 66, no. 6-7: 867-891.

Journal article
Published: 01 December 2015 in International Journal of Sediment Research
Reads 0
Downloads 0
ACS Style

Le Wang; Alan Cuthbertson; Gareth Pender; Zhixian Cao. Experimental investigations of graded sediment transport under unsteady flow hydrographs. International Journal of Sediment Research 2015, 30, 306 -320.

AMA Style

Le Wang, Alan Cuthbertson, Gareth Pender, Zhixian Cao. Experimental investigations of graded sediment transport under unsteady flow hydrographs. International Journal of Sediment Research. 2015; 30 (4):306-320.

Chicago/Turabian Style

Le Wang; Alan Cuthbertson; Gareth Pender; Zhixian Cao. 2015. "Experimental investigations of graded sediment transport under unsteady flow hydrographs." International Journal of Sediment Research 30, no. 4: 306-320.

Journal article
Published: 01 August 2015 in Water Management
Reads 0
Downloads 0

DOI: 10.1680/wama.2015.168.4.151 ISSN: 1741-7589 E-ISSN: 1751-7729 Document Type: Editorial Format: HTML,PDF

ACS Style

Alan J. S. Cuthbertson. Editorial. Water Management 2015, 168, 151 -152.

AMA Style

Alan J. S. Cuthbertson. Editorial. Water Management. 2015; 168 (4):151-152.

Chicago/Turabian Style

Alan J. S. Cuthbertson. 2015. "Editorial." Water Management 168, no. 4: 151-152.

Book chapter
Published: 12 August 2014 in River Flow 2014
Reads 0
Downloads 0
ACS Style

L Wang; A Cuthbertson; G Pender; Z Cao. The response of bed-load sediment transport and bed evolution under unsteady hydrograph flows. River Flow 2014 2014, 1619 -1627.

AMA Style

L Wang, A Cuthbertson, G Pender, Z Cao. The response of bed-load sediment transport and bed evolution under unsteady hydrograph flows. River Flow 2014. 2014; ():1619-1627.

Chicago/Turabian Style

L Wang; A Cuthbertson; G Pender; Z Cao. 2014. "The response of bed-load sediment transport and bed evolution under unsteady hydrograph flows." River Flow 2014 , no. : 1619-1627.

Journal article
Published: 01 June 2014 in Water Management
Reads 0
Downloads 0
ACS Style

Alan J. S. Cuthbertson. Editorial. Water Management 2014, 167, 309 -310.

AMA Style

Alan J. S. Cuthbertson. Editorial. Water Management. 2014; 167 (6):309-310.

Chicago/Turabian Style

Alan J. S. Cuthbertson. 2014. "Editorial." Water Management 167, no. 6: 309-310.

Journal article
Published: 22 January 2014 in Ocean Dynamics
Reads 0
Downloads 0

The overflow of dense water from the Nordic Seas through the Faroese Channel system was investigated through combined laboratory experiments and numerical simulations using the Massachusetts Institute of Technology General Circulation Model. In the experimental study, a scaled, topographic representation of the Faroe-Shetland Channel, Wyville-Thomson Basin and Ridge and Faroe Bank Channel seabed bathymetry was constructed and mounted in a rotating tank. A series of parametric experiments was conducted using dye-tracing and drogue-tracking techniques to investigate deep-water overflow pathways and circulation patterns within the modelled region. In addition, the structure of the outflowing dense bottom water was investigated through density profiling along three cross-channel transects located in the Wyville-Thomson Basin and the converging, up-sloping approach to the Faroe Bank Channel. Results from the dye-tracing studies demonstrate a range of parametric conditions under which dense water overflow across the Wyville-Thomson Ridge is shown to occur, as defined by the Burger number, a non-dimensional length ratio and a dimensionless dense water volume flux parameter specified at the Faroe-Shetland Channel inlet boundary. Drogue-tracking measurements reveal the complex nature of flow paths and circulations generated in the modelled topography, particularly the development of a large anti-cyclonic gyre in the Wyville-Thompson Basin and up-sloping approach to the Faroe Bank Channel, which diverts the dense water outflow from the Faroese shelf towards the Wyville-Thomson Ridge, potentially promoting dense water spillage across the ridge itself. The presence of this circulation is also indicated by associated undulations in density isopycnals across the Wyville-Thomson Basin. Numerical simulations of parametric test cases for the main outflow pathways and density structure in a similarly-scaled Faroese Channels model domain indicate excellent qualitative agreement with the experimental observations and measurements. In addition, the comparisons show that strong temporal variability in the predicted outflow pathways and circulations have a strong influence in regulating the Faroe Bank Channel and Wyville-Thomson Ridge overflows, as well as in determining the overall response in the Faroese Channels to changes in the Faroe-Shetland Channel inlet boundary conditions.

ACS Style

Alan Cuthbertson; Peter Davies; Nataliya Stashchuk; Vasiliy Vlasenko. Model studies of dense water overflows in the Faroese Channels. Ocean Dynamics 2014, 64, 273 -292.

AMA Style

Alan Cuthbertson, Peter Davies, Nataliya Stashchuk, Vasiliy Vlasenko. Model studies of dense water overflows in the Faroese Channels. Ocean Dynamics. 2014; 64 (2):273-292.

Chicago/Turabian Style

Alan Cuthbertson; Peter Davies; Nataliya Stashchuk; Vasiliy Vlasenko. 2014. "Model studies of dense water overflows in the Faroese Channels." Ocean Dynamics 64, no. 2: 273-292.

Research papers
Published: 02 September 2013 in Journal of Hydraulic Research
Reads 0
Downloads 0

Detailed velocity and density measurements are used to investigate dense water dynamics in an inclined, silled channel of triangular cross-section with varying side slope α and adverse bed slope φ. For the steeper channel configuration considered (φ=3.6°), the dense-water bottom current is shown to be frictionally-controlled, with an internal flow structure characterized by a sharp pycnocline and decreasing isopycnal separation in the along-channel direction. For the milder up-sloping channel (φ=1.7°), the dense water outflow is shown to be hydraulically-controlled as the channel sill section is approached, with internal flow dynamics characterized by increasing isopycnal separation in the along-channel direction. Analysis of the gradient Richardson number Rig of the flow confirms that hydraulically-controlled flows dilute the active bottom water due to interfacial mixing. A gradually-varying internal flow model and a two-layer hydraulic modelling approach are shown, respectively, to represent adequately the outflow behaviour for these two bed slope conditions.

ACS Style

Janek Laanearu; Alan J. S. Cuthbertson; Peter A. Davies. Dynamics of dense gravity currents and mixing in an up-sloping and converging vee-shaped channel. Journal of Hydraulic Research 2013, 52, 67 -80.

AMA Style

Janek Laanearu, Alan J. S. Cuthbertson, Peter A. Davies. Dynamics of dense gravity currents and mixing in an up-sloping and converging vee-shaped channel. Journal of Hydraulic Research. 2013; 52 (1):67-80.

Chicago/Turabian Style

Janek Laanearu; Alan J. S. Cuthbertson; Peter A. Davies. 2013. "Dynamics of dense gravity currents and mixing in an up-sloping and converging vee-shaped channel." Journal of Hydraulic Research 52, no. 1: 67-80.

Journal article
Published: 09 May 2013 in Environmental Fluid Mechanics
Reads 0
Downloads 0

Results are presented from a series of parametric experimental and analytical studies of the behaviour of dense gravity currents along rotating, up-sloping, wedge-shaped channels. High resolution density profile measurements at fixed cross- and along-channel locations reveal the outflowing bottom gravity currents to adjust to quasi-steady, geostrophically-balanced conditions along the channels, with the outflow layer thickness and cross-channel interface slope shown to scale with the inlet Burger number for all experimental conditions tested. A general analytical solution to the classic rotating hydraulics problem has been developed under the assumption of inviscid, zero-potential-vorticity conditions to model dense water flow through a triangular constriction and thus simulate the vee-channel configurations under consideration. Predictions from this zero-PV model are shown to provide good overall quantitative agreement with experimental measurements obtained both under hydraulically-controlled conditions at the channel exit and for subcritical conditions generated along the channel length. Quantitative discrepancies between measurements and analytical predictions are attributed primarily to assumptions and limitations associated with the zero-PV modelling approach adopted, as well as the to the rapid adjustment in outflow characteristics as the channel exit is approached, as characterised by the along-channel variation in densimetric Froude number for the outflows.

ACS Style

A. J. S. Cuthbertson; P. Lundberg; P. A. Davies; J. Laanearu. Gravity currents in rotating, wedge-shaped, adverse channels. Environmental Fluid Mechanics 2013, 14, 1251 -1273.

AMA Style

A. J. S. Cuthbertson, P. Lundberg, P. A. Davies, J. Laanearu. Gravity currents in rotating, wedge-shaped, adverse channels. Environmental Fluid Mechanics. 2013; 14 (5):1251-1273.

Chicago/Turabian Style

A. J. S. Cuthbertson; P. Lundberg; P. A. Davies; J. Laanearu. 2013. "Gravity currents in rotating, wedge-shaped, adverse channels." Environmental Fluid Mechanics 14, no. 5: 1251-1273.