R. M. Dorrell
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View article: The accelerated propagation of pulsed gravity currents
The accelerated propagation of pulsed gravity currents Open
Pulsed gravity currents are generated by the sequential release of dense material into a lighter ambient. We investigate the dynamics of pulsed gravity currents using physical scale experiments, two-dimensional depth-averaged shallow water…
View article: Transport by waves and turbulence: Dilute suspensions in stably stratified plane Poiseuille flow
Transport by waves and turbulence: Dilute suspensions in stably stratified plane Poiseuille flow Open
Suspended particle transport is inherent in a wide range of industrial and environmental flows, from energy generation to manufacturing and from marine to atmospheric systems. Such flows are inherently stratified where varying concentratio…
View article: Modelling the transport and deposition of sediment-microplastics fluxes in a braided river, using Delft3D
Modelling the transport and deposition of sediment-microplastics fluxes in a braided river, using Delft3D Open
Rivers polluted by plastics have become sites where mixtures of microplastics and sediment particles are transported by the river current and deposited in the riverbed. A hydromorphodynamic numerical model was developed using Delft3D (soft…
View article: EUS-guided gallbladder drainage versus percutaneous gallbladder drainage in high-risk patients with acute cholecystitis: a propensity score-matched analysis
EUS-guided gallbladder drainage versus percutaneous gallbladder drainage in high-risk patients with acute cholecystitis: a propensity score-matched analysis Open
Background: Endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) using lumen apposing metal stent (LAMS) has emerged as a treatment option in patients with acute cholecystitis (AC) deemed unfit for surgery. Prior to this technique, …
View article: The Impact of Wave Prediction Uncertainty on the Control of a Multi-Axis Wave Energy Converter
The Impact of Wave Prediction Uncertainty on the Control of a Multi-Axis Wave Energy Converter Open
As global energy demands and climate concerns continue to grow, the need for renewable energy is becoming increasingly clear and wave energy converter (WEC) systems are receiving growing interest. WECs often utilize optimal control techniq…
View article: Gravity current energetics and particle suspension
Gravity current energetics and particle suspension Open
Gravity currents are a ubiquitous density-driven flow occurring in both the natural environment and in industry. They include: seafloor turbidity currents, primary vectors of sediment, nutrient and pollutant transport; cold fronts; and haz…
View article: Global evaluation of wave data reanalysis: Comparison of the ERA5 dataset to buoy observations
Global evaluation of wave data reanalysis: Comparison of the ERA5 dataset to buoy observations Open
Wave reanalysis data are critical to multiple industries including commerce, fisheries, petroleum, offshore wind, the design and the construction of maritime structures. One of the most used datasets is ERA5 developed by the European Centr…
View article: Climate change impacts on the accessibility of offshore structures
Climate change impacts on the accessibility of offshore structures Open
In the next 25 years an unprecedented number of new marine artificial structures, over 75,000 offshore wind turbines alone, are planned to meet global net zero targets. Structures are required to last for multiple decades in the hostile ma…
View article: The Influence of Structural Design on the Hydrodynamics of Floating Offshore Wind Turbine Platforms
The Influence of Structural Design on the Hydrodynamics of Floating Offshore Wind Turbine Platforms Open
Floating offshore wind turbine (FOWT) platforms are subject to a wide range of hydrodynamic loading and dynamic movement, making hydrodynamic force evaluation difficult. Amongst various floating platforms, submersible platforms are structu…
View article: Transport by waves and turbulence: Dilute suspensions in stably stratified plane Poiseuille flow
Transport by waves and turbulence: Dilute suspensions in stably stratified plane Poiseuille flow Open
We investigate the transport dynamics of negatively buoyant passive sediment in a thermally stratified plane Poiseuille flow using numerical simulation, exploring the influence of large-scale coherent structures on sediment transport proce…
View article: The transport and vertical distribution of microplastics in the Mekong River, SE Asia
The transport and vertical distribution of microplastics in the Mekong River, SE Asia Open
Rivers are primary vectors of plastic debris to oceans, but sources, transport mechanisms, and fate of fluvial microplastics (-3 (0.073 mg l-1). Concentrations increased downstream from rural Kampi, Cambodia (344 km from river mouth; 2 mic…
View article: Gravity current energetics and particle suspension
Gravity current energetics and particle suspension Open
Gravity currents are a ubiquitous density driven flow occurring in both the natural environment and in industry. They include: seafloor turbidity currents, primary vectors of sediment, nutrient and pollutant transport; cold fronts; and haz…
View article: Linear dynamics in turbulent stratified plane Poiseuille flow
Linear dynamics in turbulent stratified plane Poiseuille flow Open
We investigate a turbulent stratified plane Poiseuille flow using linear models and nonlinear simulations. We propose the first complete explanation for the prolific and coherent backward (BWs)- and forward-propagating waves (FWs), which h…
View article: Modeling the Tilt of Bend‐Traversing Turbidity Currents: Implications for Sinuous Submarine Channel Development
Modeling the Tilt of Bend‐Traversing Turbidity Currents: Implications for Sinuous Submarine Channel Development Open
The controls on the development of submarine channel sinuosity are contested: slope gradient and Coriolis forcing have both been recognized as key governing factors: gradient via an inverse relationship (low sinuosity at high slope and vic…
View article: Monopile-induced turbulence and sediment redistribution form visible wakes in offshore wind farms
Monopile-induced turbulence and sediment redistribution form visible wakes in offshore wind farms Open
Offshore wind farms are becoming an increasingly common feature in the marine environment as a renewable energy source. There is a growing body of evidence on the effects of wind farms on the seabed and its organisms. However, an important…
View article: Effect of Increased Geometric Complexity on LoadActing on Floating Offshore Wind Turbine Platforms
Effect of Increased Geometric Complexity on LoadActing on Floating Offshore Wind Turbine Platforms Open
Renewable energy sources, including offshore wind energy, are fundamental to reducing fossil fuelconsumption and greenhouse gas emissions. Many countries are planning for a rapid and massive ex-pansion of the offshore wind sector to meet t…
View article: Circulation of hydraulically ponded turbidity currents and the filling of continental slope minibasins
Circulation of hydraulically ponded turbidity currents and the filling of continental slope minibasins Open
Natural depressions on continental margins termed minibasins trap turbidity currents, a class of sediment-laden seafloor density driven flow. These currents are the primary downslope vectors for clastic sediment, particulate organic carbon…
View article: Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow
Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow Open
Submarine channels are key features for the transport of flow and nutrients into deep water. Previous studies of their morphology and channel evolution have treated these systems as abiotic, and therefore assume that physical processes are…
View article: Clinical outcomes of long-term transmural drainage with double pigtail stents in disconnected pancreatic duct syndrome
Clinical outcomes of long-term transmural drainage with double pigtail stents in disconnected pancreatic duct syndrome Open
Placement of long-term transmural DPS is an effective modality for preventing collection re-accumulation with a favorable safety profile. Randomized prospective studies are essential to investigate the optimal removal timing of indwelling …
View article: Circulation of hydraulically ponded turbidity currents in three-dimensional minibasins with implications for turbidite shape
Circulation of hydraulically ponded turbidity currents in three-dimensional minibasins with implications for turbidite shape Open
Minibasins on continental margins trap turbidity currents transporting material downslope, but little is known about the inherently three-dimensional (3-D) mechanics of these confined flows. Utilizing new methodology, experimental results …
View article: Streamwise Turbulence Modulation in Non‐Uniform Open‐Channel Clay Suspension Flows
Streamwise Turbulence Modulation in Non‐Uniform Open‐Channel Clay Suspension Flows Open
Cohesive sediment particles are ubiquitous in environmental flows. The cohesive properties of clay promote the formation of clay flocs and gels and relatively small suspended clay concentrations can enhance or suppress turbulence in a flow…
View article: Inadequacy of fluvial energetics for describing gravity current autosuspension
Inadequacy of fluvial energetics for describing gravity current autosuspension Open
Gravity currents, such as sediment-laden turbidity currents, are ubiquitous natural flows that are driven by a density difference. Turbidity currents have provided vital motivation to advance understanding of this class of flows because th…
View article: Inadequacy of fluvial energetics for describing gravity current autosuspension
Inadequacy of fluvial energetics for describing gravity current autosuspension Open
"Consider the [turbidity] current as ... a river" R. A. Bagnold (1962); the foundation of contemporary deep marine sedimentology. Gravity currents, such as sediment-laden turbidity currents, are ubiquitous natural flows that are driven by …
View article: Multi-fidelity modelling of shark skin denticle flows: insights into drag generation mechanisms
Multi-fidelity modelling of shark skin denticle flows: insights into drag generation mechanisms Open
We investigate the flow over smooth (non-ribletted) shark skin denticles in an open-channel flow using direct numerical simulation (DNS) and two Reynolds averaged Navier–Stokes (RANS) closures. Large peaks in pressure and viscous drag are …
View article: Density stratification controls the bedform phase diagram of saline‐gravity currents versus open‐channel flows
Density stratification controls the bedform phase diagram of saline‐gravity currents versus open‐channel flows Open
Sedimentary bedforms such as ripples and dunes are generated both by river flows and sediment‐laden gravity currents. Gravity current deposits are usually parameterized using existing bedform phase diagrams which are based on data from lab…
View article: Effect of hydro-climate variation on biofilm dynamics and its impact in intertidal environments
Effect of hydro-climate variation on biofilm dynamics and its impact in intertidal environments Open
Shallow tidal environments are very productive ecosystems but are sensitive to environmental changes and sea level rise. Bio-morphodynamic control of these environments is therefore a crucial consideration; however, the effect of small-sca…
View article: 10.1063/5.0108337.5
10.1063/5.0108337.5 Open
The lock-exchange problem is used extensively to study the flow dynamics of density-driven flows, such as gravity currents, and as a canonical problem to mixing in stratified flows. Opposite halves of a domain are filled with two fluids of…