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Dr Robert Dorrell

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Robert Dorrell

University Research Fellow


Equilibrium sediment transport, grade and discharge for suspended-load-dominated flows on Earth, Mars and Titan (2020)
Journal Article
Amy, L., & Dorrell, R. (2021). Equilibrium sediment transport, grade and discharge for suspended-load-dominated flows on Earth, Mars and Titan. Icarus, 360, https://doi.org/10.1016/j.icarus.2020.114243

© 2020 The Authors Recent surface observations have emphasised the importance of bedload transport by rivers and streams on Mars and Titan. Previous “hydraulic” analysis, however, has also shown that transport as suspended load should be possible, if... Read More about Equilibrium sediment transport, grade and discharge for suspended-load-dominated flows on Earth, Mars and Titan.

Relating the Flow Processes and Bedforms of Steady-State and Waning Density Currents (2020)
Journal Article
de Cala, I., Ohata, K., Dorrell, R., Naruse, H., Patacci, M., Amy, L. A., …McCaffrey, W. D. (2020). Relating the Flow Processes and Bedforms of Steady-State and Waning Density Currents. Frontiers in Earth Science, 8, https://doi.org/10.3389/feart.2020.535743

© Copyright© 2020 de Cala, Ohata, Dorrell, Naruse, Patacci, Amy, Simmons, McLelland and McCaffrey. The interaction between turbidity currents and mobile substrates can lead to the development of different types of bedforms. Although much research has... Read More about Relating the Flow Processes and Bedforms of Steady-State and Waning Density Currents.

Turbulence Processes within Turbidity Currents (2020)
Journal Article
Wells, M. G., & Dorrell, R. M. (2021). Turbulence Processes within Turbidity Currents. Annual Review of Fluid Mechanics, 53(1), 59-83. https://doi.org/10.1146/annurev-fluid-010719-060309

Sediment-laden gravity currents, or turbidity currents, are density-driven flows that transport vast quantities of particulate material across the floor of lakes and oceans. Turbidity currents are generated by slope failure or initiated when a sedime... Read More about Turbulence Processes within Turbidity Currents.

An integrated process-based model of flutes and tool marks in deep-water environments: Implications for palaeohydraulics, the Bouma sequence and hybrid event beds (2020)
Journal Article
Clare, M. A., Peakall, J., Lee, D. R., Best, J., Dorrell, R. M., Baas, J. H., …Talling, P. J. (2020). An integrated process-based model of flutes and tool marks in deep-water environments: Implications for palaeohydraulics, the Bouma sequence and hybrid event beds. Sedimentology, https://doi.org/10.1111/sed.12727

Flutes and tool marks are commonly observed sedimentary structures on the bases of sandstones in deep‐water successions. These sole structures are universally used as palaeocurrent indicators but, in sharp contrast to most sedimentary structures, the... Read More about An integrated process-based model of flutes and tool marks in deep-water environments: Implications for palaeohydraulics, the Bouma sequence and hybrid event beds.

Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size (2020)
Journal Article
Lloyd, C. J., Peakall, J., Burns, A. D., Keevil, G. M., & Dorrell, R. M. (in press). Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size. International Journal of Computational Fluid Dynamics, 34(3), 204-225. https://doi.org/10.1080/10618562.2020.1732941

The sensitivity of a large range of turbulence closures to the near-wall grid resolution is assessed through analytical and numerical techniques. We determine model boundedness, limiting behaviour, and solution dependence of channel flow simulations... Read More about Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size.

Influence of Coriolis force upon bottom boundary layers in a large‐scale gravity current experiment: Implications for evolution of sinuous deep‐water channel systems (2020)
Journal Article
Davarpanah Jazi, S., Wells, M., Peakall, J., Dorrell, R., Thomas, R., Keevil, G., …Valran, T. (2020). Influence of Coriolis force upon bottom boundary layers in a large‐scale gravity current experiment: Implications for evolution of sinuous deep‐water channel systems. Journal of Geophysical Research: Oceans, 125(3), https://doi.org/10.1029/2019JC015284

Oceanic density currents in many deep-water channels are strongly influenced by the Coriolis force. The dynamics of the bottom-boundary layer in large geostrophic flows, and low Rossby number turbidity currents, are very important for determining the... Read More about Influence of Coriolis force upon bottom boundary layers in a large‐scale gravity current experiment: Implications for evolution of sinuous deep‐water channel systems.

Pulse propagation in gravity currents (2020)
Journal Article
Allen, P. A., Dorrell, R. M., Harlen, O. G., Thomas, R. E., & McCaffrey, W. D. (2020). Pulse propagation in gravity currents. Physics of Fluids, 32(1), https://doi.org/10.1063/1.5130576

Real world gravity current flows rarely exist as a single discrete event, but are instead made up of multiple surges. This paper examines the propagation of surges as pulses in gravity currents. Using theoretical shallow-water modeling, we analyze th... Read More about Pulse propagation in gravity currents.

Quantifying faulting and base level controls on syn-rift sedimentation using stratigraphic architectures of coeval, adjacent Early-Middle Pleistocene fan deltas in Lake Corinth, Greece (2019)
Journal Article
Barrett, B. J., Collier, R. E., Hodgson, D. M., Gawthorpe, R. L., Dorrell, R. M., & Cullen, T. M. (in press). Quantifying faulting and base level controls on syn-rift sedimentation using stratigraphic architectures of coeval, adjacent Early-Middle Pleistocene fan deltas in Lake Corinth, Greece. Basin Research, https://doi.org/10.1111/bre.12356

Quantification of allogenic controls in rift basin‐fills requires analysis of multiple depositional systems because of marked along‐strike changes in depositional architecture. Here, we compare two coeval Early‐Middle Pleistocene syn‐rift fan deltas... Read More about Quantifying faulting and base level controls on syn-rift sedimentation using stratigraphic architectures of coeval, adjacent Early-Middle Pleistocene fan deltas in Lake Corinth, Greece.

Self-sharpening induces jet-like structure in seafloor gravity currents (2019)
Journal Article
Dorrell, R. M., Peakall, J., Darby, S. E., Parsons, D. R., Johnson, J., Sumner, E. J., …Tezcan, D. (2019). Self-sharpening induces jet-like structure in seafloor gravity currents. Nature communications, 10(1), https://doi.org/10.1038/s41467-019-09254-2

Gravity currents are the primary means by which sediments, solutes and heat are transported across the ocean-floor. Existing theory of gravity current flow employs a statistically-stable model of turbulent diffusion that has been extant since the 196... Read More about Self-sharpening induces jet-like structure in seafloor gravity currents.