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Dr Robert Thomas

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Robert Thomas

Senior Research Fellow in Geomorphology and Flood Risk


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.

Individual-based model of juvenile eel movement parametrized with computational fluid dynamics-derived flow fields informs improved fish pass design (2020)
Journal Article
Padgett, T., Thomas, R. E., Borman, D., & Mould, D. (2020). Individual-based model of juvenile eel movement parametrized with computational fluid dynamics-derived flow fields informs improved fish pass design. Royal Society Open Science, 7(1), https://doi.org/10.1098/rsos.191505

European eel populations have declined markedly in recent decades, caused in part by in-stream barriers, such as weirs and pumping stations, which disrupt the upstream migration of juvenile eels, or elvers, into rivers. Eel passes, narrow sloping cha... Read More about Individual-based model of juvenile eel movement parametrized with computational fluid dynamics-derived flow fields informs improved fish pass design.

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.

Dynamics and Deposition of Sediment-Bearing Multi- Pulsed Flows and Geological Implication (2019)
Journal Article
McCaffrey, W. D., Baas, J. H., Burns, A. D., Thomas, R. E., Keevil, G. M., Ho, V. L., …Mccaffrey, W. D. (2019). Dynamics and Deposition of Sediment-Bearing Multi- Pulsed Flows and Geological Implication. Journal of Sedimentary Research, 8(11), 1127-1139. https://doi.org/10.2110/jsr.2019.62

Copyright © 2019, SEPM (Society for Sedimentary Geology) Previous studies on dilute, multi-pulsed, subaqueous saline flows have demonstrated that pulses will inevitably advect forwards to merge with the flow front. On the assumption that pulse mergin... Read More about Dynamics and Deposition of Sediment-Bearing Multi- Pulsed Flows and Geological Implication.

Reply to Discussion on ‘Tectonic and environmental controls on Palaeozoic fluvial environments: Reassessing the impacts of early land plants on sedimentation’ Journal of the Geological Society, London, https://doi.org/10.1144/jgs2016-063 (2017)
Journal Article
Santos, M. G., Mountney, N. P., Peakall, J., Thomas, R. E., Wignall, P. B., & Hodgson, D. M. (2017). Reply to Discussion on ‘Tectonic and environmental controls on Palaeozoic fluvial environments: Reassessing the impacts of early land plants on sedimentation’ Journal of the Geological Society, London, https://doi.org/10.1144/jgs2016-063. Journal of the Geological Society, 174(5), 950-952. https://doi.org/10.1144/jgs2017-031

We thank Davies et al. (2017) for their comments and welcome the opportunity to further discuss the role of early land plants in fluvial environments. Critically, Davies et al. (2017) note that although testable hypotheses exist for the possible role... Read More about Reply to Discussion on ‘Tectonic and environmental controls on Palaeozoic fluvial environments: Reassessing the impacts of early land plants on sedimentation’ Journal of the Geological Society, London, https://doi.org/10.1144/jgs2016-063.

Bias in mean velocities and noise in variances and covariances measured using a multistatic acoustic profiler: the Nortek Vectrino Profiler (2017)
Journal Article
Creelle, S., Thomas, R. E., Schindfessel, L., McLelland, S. J., Creëlle, S., & De Mulder, T. (2017). Bias in mean velocities and noise in variances and covariances measured using a multistatic acoustic profiler: the Nortek Vectrino Profiler. Measurement Science and Technology, 28(7), 075302. https://doi.org/10.1088/1361-6501/aa7273

This paper compiles the technical characteristics and operating principles of the Nortek Vectrino Profiler and reviews previously reported user experiences. A series of experiments are then presented that investigate instrument behaviour and performa... Read More about Bias in mean velocities and noise in variances and covariances measured using a multistatic acoustic profiler: the Nortek Vectrino Profiler.

Rainfall-runoff properties of tephra: simulated effects of grain-size and antecedent rainfall (2017)
Journal Article
Jones, R., Thomas, R. E., Peakall, J., & Manville, V. (2017). Rainfall-runoff properties of tephra: simulated effects of grain-size and antecedent rainfall. Geomorphology, 282, 39-51. https://doi.org/10.1016/j.geomorph.2016.12.023

Rain-triggered lahars (RTLs) are a significant and often persistent secondary volcanic hazard at many volcanoes around the world. Rainfall on unconsolidated volcaniclastic material is the primary initiation mechanism of RTLs: the resultant flows have... Read More about Rainfall-runoff properties of tephra: simulated effects of grain-size and antecedent rainfall.

Erratum to “Geometrical and mechanical properties of four species of northern European brown macroalgae” [Coast. Eng. 84 (2014) 73–80] (2016)
Journal Article
Henry, P. Y., Paul, M., & Thomas, R. (2017). Erratum to “Geometrical and mechanical properties of four species of northern European brown macroalgae” [Coast. Eng. 84 (2014) 73–80]. Coastal Engineering, 120, 36-37. https://doi.org/10.1016/j.coastaleng.2016.11.002

© 2016 This erratum concerns Eq. (1) used in Paul et al. [3] which is the same as Eq. (1) in Paul and Henry [4]. A three-point bending test with clamped ends was performed on macroalga blade samples. As suggested in Fig. 1, this mechanical test was c... Read More about Erratum to “Geometrical and mechanical properties of four species of northern European brown macroalgae” [Coast. Eng. 84 (2014) 73–80].

A combined field, laboratory and numerical study of the forces applied to, and the potential for removal of, bar top vegetation in a braided river (2016)
Journal Article
Bankhead, N. L., Thomas, R. E., & Simon, A. (2017). A combined field, laboratory and numerical study of the forces applied to, and the potential for removal of, bar top vegetation in a braided river. Earth surface processes and landforms : the journal of the British Geomorphological Research Group, 42(3), 439-459. https://doi.org/10.1002/esp.3997

Vegetation can have an important role in controlling channel planform, through its effects on channel roughness, and root-reinforcement of bank and bar materials. Along the Platte River in central Nebraska, USA, The Platte River Recovery Implementati... Read More about A combined field, laboratory and numerical study of the forces applied to, and the potential for removal of, bar top vegetation in a braided river.

The impact of macroalgae on mean and turbulent flow fields (2015)
Journal Article
Thomas, R. E., & Mclelland, S. J. (2015). The impact of macroalgae on mean and turbulent flow fields. Journal of hydrodynamics. Ser. B, 27(3), 427-435. https://doi.org/10.1016/S1001-6058%2815%2960500-5

© 2015 Publishing House for Journal of Hydrodynamics. In this paper, we attempt to quantify the mean and turbulent flow fields around live macroalgae within a tidal inlet in Norway. Two Laminaria digitata specimens ∼0.50m apart were selected for deta... Read More about The impact of macroalgae on mean and turbulent flow fields.

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