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Water quality modelling of the Mekong River basin: climate change and socioeconomics drive flow and nutrient flux changes to the Mekong Delta (2019)
Journal Article
Whitehead, P., Jin, L., Bussi, G., Voepel, H., Darby, S., Vasilopoulos, G., …Hung, N. (2019). Water quality modelling of the Mekong River basin: climate change and socioeconomics drive flow and nutrient flux changes to the Mekong Delta. The Science of the total environment, https://doi.org/10.1016/j.scitotenv.2019.03.315

The Mekong delta is recognised as one of the world's most vulnerable mega-deltas, being subject to a range of environmental pressures including sea level rise, increasing population, and changes in flows and nutrients from its upland catchment. With... Read More

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

Monometallic and bimetallic catalysts based on Pd, Cu and Ni for hydrogen transfer deoxygenation of a prototypical fatty acid to diesel range hydrocarbons (2019)
Journal Article
Cheah, K. W., Taylor, M. J., Osatiashtiani, A., Beaumont, S. K., Nowakowski, D. J., Yusup, S., …Kyriakou, G. (in press). Monometallic and bimetallic catalysts based on Pd, Cu and Ni for hydrogen transfer deoxygenation of a prototypical fatty acid to diesel range hydrocarbons. Catalysis Today, https://doi.org/10.1016/j.cattod.2019.03.017

Bimetallic PdxNi(100-x) and PdxCu(100-x) structures of a wide compositional range supported on activated carbon were synthesised via a simple, cheap and commercially relevant method. The surface and bulk properties of both the bimetallic structures a... Read More

The structure and entrainment characteristics of partially-confined gravity currents (2019)
Journal Article
Kelly, R. W., Dorrell, R. M., Burns, A. D., & McCaffrey, W. D. (2019). The structure and entrainment characteristics of partially-confined gravity currents. Journal of geophysical research. C, Oceans, 124(3), 2110-2125. https://doi.org/10.1029/2018JC014042

Seafloor channels are the main conduit for turbidity currents transporting sediment to the deep ocean and they can extend for thousands of kilometres along the ocean floor. Although it is common for channel‐traversing turbidity currents to spill onto... Read More

Wave ripple development on mixed clay-sand substrates: Effects of clay winnowing and armoring (2018)
Journal Article
Wu, X., Baas, J. H., Parsons, D. R., Eggenhuisen, J., Amoudry, L., Cartigny, M., …Ruessink, G. (2018). Wave ripple development on mixed clay-sand substrates: Effects of clay winnowing and armoring. Journal of geophysical research. JGR. Earth surface, 123(11), 2784-2801. doi:10.1029/2018JF004681

Based on bed form experiments in a large‐scale flume, we demonstrate that the rate of development of wave ripples on a mixed sand‐clay bed under regular waves is significantly lower than on a pure‐sand bed, even at clay fractions as low as 4.2%, and... Read More

Powerful turbidity currents driven by dense basal layers (2018)
Journal Article
Paull, C. K., Talling, P. J., Maier, K. L., Parsons, D., Xu, J., Caress, D. W., …Cartigny, M. J. (2018). Powerful turbidity currents driven by dense basal layers. Nature communications, 9(1), doi:10.1038/s41467-018-06254-6

Seafloor sediment flows (turbidity currents) are among the volumetrically most important yet least documented sediment transport processes on Earth. A scarcity of direct observations means that basic characteristics, such as whether flows are entirel... Read More

Optimisation of flow resistance and turbulent mixing over bed forms (2018)
Journal Article
Arfaie, A., Burns, A., Dorrell, R., Ingham, D., Eggenhuisen, J., & McCaffrey, W. (2018). Optimisation of flow resistance and turbulent mixing over bed forms. Environmental modelling & software : with environment data news, 107, 141-147. doi:10.1016/j.envsoft.2018.06.002

Previous work on the interplay between turbulent mixing and flow resistance for flows over periodic rib roughness elements is extended to consider the flow over idealized shapes representative of naturally occurring sedimentary bed forms. The primary... Read More

Modelling impacts of tidal stream turbines on surface waves (2018)
Journal Article
Li, X., Li, M., Jordan, L. B., McLelland, S., Parsons, D. R., Amoudry, L. O., …Comerford, L. (2019). Modelling impacts of tidal stream turbines on surface waves. Renewable energy, 130, 725-734. doi:10.1016/j.renene.2018.05.098

© 2018 Elsevier Ltd A high resolution Computational Flow Dynamics (CFD) numerical model is built based on a laboratory experiment in this research to study impacts of tidal turbines on surface wave dynamics. A reduction of ∼3% in wave height is obser... Read More

Laboratory study on the effects of hydro kinetic turbines on hydrodynamics and sediment dynamics (2018)
Journal Article
Ramírez-Mendoza, R., Amoudry, L., Thorne, P., Cooke, R., McLelland, S., Jordan, L., …Murdoch, L. (2018). Laboratory study on the effects of hydro kinetic turbines on hydrodynamics and sediment dynamics. Renewable energy, 129(Part A), 271-284. doi:10.1016/j.renene.2018.05.094

© 2018 The Authors The need for hydrokinetic turbine wake characterisation and their environmental impact has led to a number of studies. However, a small number of them have taken into account mobile sediment bed effects. The aim of the present work... Read More

Beyond equilibrium: Re-evaluating physical modelling of fluvial systems to represent climate changes (2018)
Journal Article
Baynes, E. R., van de Lageweg, W. I., McLelland, S. J., Parsons, D. R., Aberle, J., Dijkstra, J., …Moulin, F. (2018). Beyond equilibrium: Re-evaluating physical modelling of fluvial systems to represent climate changes. Earth-Science Reviews, 181, 82-97. doi:10.1016/j.earscirev.2018.04.007

© 2018 Elsevier B.V. The interactions between water, sediment and biology in fluvial systems are complex and driven by multiple forcing mechanisms across a range of spatial and temporal scales. In a changing climate, some meteorological drivers are e... Read More

Quantifying biostabilisation effects of biofilm-secreted and extracted extracellular polymeric substances (EPSs) on sandy substrate (2018)
Journal Article
Van De Lageweg, W. I., McLelland, S. J., & Parsons, D. R. (2018). Quantifying biostabilisation effects of biofilm-secreted and extracted extracellular polymeric substances (EPSs) on sandy substrate. Earth surface dynamics ESURF ; an interactive open access journal of the European Geosciences Union, 6(1), 203-215. doi:10.5194/esurf-6-203-2018

© Author(s) 2018. Microbial assemblages ( < q > biofilms < /q > ) preferentially develop at water-sediment interfaces and are known to have a considerable influence on sediment stability and erodibility. There is potential for significant impacts on... Read More

Low-angle dunes in the Changjiang (Yangtze) Estuary: Flow and sediment dynamics under tidal influence (2018)
Journal Article
Hackney, C. R., Hu, H., Wei, T., Yang, Z., Hackney, C., & Parsons, D. R. (2018). Low-angle dunes in the Changjiang (Yangtze) Estuary: Flow and sediment dynamics under tidal influence. Estuarine, coastal and shelf science, 205, (110-122). doi:10.1016/j.ecss.2018.03.009. ISSN 0272-7714

It has long been highlighted that important feedbacks exist between river bed morphology, sediment transport and the turbulent flow field and that these feedbacks change in response to forcing mechanisms. However, our current understanding of bedform... Read More

Particle Size Distribution Controls the Threshold Between Net Sediment Erosion and Deposition in Suspended Load Dominated Flows (2018)
Journal Article
Dorrell, R. M., Amy, L. A., Peakall, J., & McCaffrey, W. D. (2018). Particle Size Distribution Controls the Threshold Between Net Sediment Erosion and Deposition in Suspended Load Dominated Flows. Geophysical research letters, 45(3), (1443-1452). doi:10.1002/2017gl076489. ISSN 0094-8276

©2018. American Geophysical Union. All Rights Reserved. The central problem of describing most environmental and industrial flows is predicting when material is entrained into, or deposited from, suspension. The threshold between erosional and deposi... Read More

A General Model for the Helical Structure of Geophysical Flows in Channel Bends (2017)
Journal Article
Azpiroz-Zabala, M., Cartigny, M. J. B., Sumner, E. J., Clare, M. A., Talling, P. J., Parsons, D. R., & Cooper, C. (2017). A General Model for the Helical Structure of Geophysical Flows in Channel Bends. Geophysical research letters, 44(23), (11,932-11,941). doi:10.1002/2017gl075721. ISSN 0094-8276

Meandering channels formed by geophysical flows (e.g., rivers and seafloor turbidity currents) include the most extensive sediment transport systems on Earth. Previous measurements from rivers show how helical flow at meander bends plays a key role i... Read More

A novel mixing mechanism in sinuous seafloor channels: Implications for submarine channel evolution (2017)
Journal Article
Dorrell, R. M., Peakall, J., Burns, C., & Keevil, G. M. (2018). A novel mixing mechanism in sinuous seafloor channels: Implications for submarine channel evolution. Geomorphology, 303, (1-12). doi:10.1016/j.geomorph.2017.11.008. ISSN 0169-555X

Previous experimental studies of density currents in sinuous seafloor channels have almost exclusively studied hydrodynamics either by considering time independent, instantaneous, flow measurements or by compiling time-averaged flow measurements. Her... Read More

Pulse propagation in turbidity currents (2017)
Journal Article
Ho, V. L., Dorrell, R. M., Keevil, G. M., Burns, A. D., & McCaffrey, W. D. (2018). Pulse propagation in turbidity currents. Sedimentology, 65(2), (620-637). doi:10.1111/sed.12397. ISSN 0037-0746

© 2017 The Authors. Sedimentology © 2017 International Association of Sedimentologists Submarine turbidity currents are a key mechanism in the transportation of clastic sediments to deep seas. Such currents may initiate with a complex longitudinal fl... Read More

Sustainable rice cultivation in the deep flooded zones of the Vietnamese Mekong Delta (2017)
Journal Article
Chapman, A., Darby, S., Tompkins, E., Hackney, C., Leyland, J., Van, P. D. T., …Nicholas, A. (2017). Sustainable rice cultivation in the deep flooded zones of the Vietnamese Mekong Delta. Vietnam Journal of Science, Technology and Engineering, 59(2), (34-38). ISSN 2525-2461

This paper explains how the management of the full-dyke system in the deep flooded zones of the Vietnamese Mekong Delta affects rice cultivation, and outlines how alternative dyke management strategies could offer more sustainable adaptations in the... Read More

An evaluation of the use of a multibeam echo-sounder for observations of suspended sediment (2017)
Journal Article
Simmons, S. M., Parsons, D. R., Best, J. L., Oberg, K. A., Czuba, J. A., & Keevil, G. M. (2017). An evaluation of the use of a multibeam echo-sounder for observations of suspended sediment. Applied acoustics. Acoustique appliqué. Angewandte Akustik, 126, (81-90). doi:10.1016/j.apacoust.2017.05.004. ISSN 0003-682X

The theory relating the acoustic backscatter from suspended sediments to the mass concentration of particles has been developed over several decades and is now routinely applied to provide measurements for commercial and scientific applications. Sing... Read More

A 3D forward stratigraphic model of fluvial meander-bend evolution for prediction of point-bar lithofacies architecture (2017)
Journal Article
Yan, N., Mountney, N. P., Colombera, L., & Dorrell, R. M. (2017). A 3D forward stratigraphic model of fluvial meander-bend evolution for prediction of point-bar lithofacies architecture. Computers & geosciences, 105, (65-80). doi:10.1016/j.cageo.2017.04.012. ISSN 0098-3004

© 2017 Elsevier Ltd Although fundamental types of fluvial meander-bend transformations – expansion, translation, rotation, and combinations thereof – are widely recognised, the relationship between the migratory behaviour of a meander bend, and its r... Read More