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Dr Steve Simmons

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Steve Simmons

Research Associate


Three-dimensional modelling of suspended sediment transport in the far wake of tidal stream turbines (2019)
Journal Article
Li, X., Li, M., Amoudry, L., Ramirez-Mendoza, R., Thorne, P., Song, Q., …McLelland, S. (in press). Three-dimensional modelling of suspended sediment transport in the far wake of tidal stream turbines. Renewable energy,

A three-dimensional tidal turbine simulation based on an oceanographic numerical model has been tested for suspended sediment calculation, particularly in the wake of a standalone tidal turbine. The results suggest a need for further improvement of t... Read More about Three-dimensional modelling of suspended sediment transport in the far wake of tidal stream turbines.

Linking direct measurements of turbidity currents to submarine canyon-floor deposits (2019)
Journal Article
Maier, K. L., Gales, J. A., Paull, C. K., Rosenberger, K., Talling, P. J., Simmons, S. M., …Sumner, E. J. (2019). Linking direct measurements of turbidity currents to submarine canyon-floor deposits. Frontiers in Earth Science, 7, https://doi.org/10.3389/feart.2019.00144

Submarine canyons are conduits for episodic and powerful sediment density flows (commonly called turbidity currents) that move globally significant amounts of terrestrial sediment and organic carbon into the deep sea, forming some of the largest sedi... Read More about Linking direct measurements of turbidity currents to submarine canyon-floor deposits.

Direct monitoring reveals initiation of turbidity currents from extremely dilute river plumes (2019)
Journal Article
Vardy, M. E., Symons, W. O., Stacey, C. D., Pope, E. L., Hunt, J. E., Hizzett, J. L., …Watts, C. (2019). Direct monitoring reveals initiation of turbidity currents from extremely dilute river plumes. Geophysical research letters, -. https://doi.org/10.1029/2019GL084526

©2019. The Authors. Rivers (on land) and turbidity currents (in the ocean) are the most important sediment transport processes on Earth. Yet how rivers generate turbidity currents as they enter the coastal ocean remains poorly understood. The current... Read More about Direct monitoring reveals initiation of turbidity currents from extremely dilute river plumes.

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), https://doi.org/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 about Powerful turbidity currents driven by dense basal layers.

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. https://doi.org/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 about Laboratory study on the effects of hydro kinetic turbines on hydrodynamics and sediment dynamics.

Newly recognized turbidity current structure can explain prolonged flushing of submarine canyons (2017)
Journal Article
Azpiroz-Zabala, M., Cartigny, M. J. B., Talling, P. J., Parsons, D. R., Sumner, E. J., Clare, M. A., …Pope, E. L. (2017). Newly recognized turbidity current structure can explain prolonged flushing of submarine canyons. Science Advances, 3(10), e1700200. https://doi.org/10.1126/sciadv.1700200

Seabed-hugging flows called turbidity currents are the volumetrically most important process transporting sediment across our planet and form its largest sediment accumulations. We seek to understand the internal structure and behavior of turbidity c... Read More about Newly recognized turbidity current structure can explain prolonged flushing of submarine canyons.

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. https://doi.org/10.1016/j.apacoust.2017.05.004

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 about An evaluation of the use of a multibeam echo-sounder for observations of suspended sediment.

An investigation of the wake recovery of two model horizontal-axis tidal stream turbines measured in a laboratory flume with Particle Image Velocimetry (2017)
Journal Article
Simmons, S. M., McLelland, S. J., Parsons, D. R., Jordan, L., Murphy, B. J., & Murdoch, L. (2018). An investigation of the wake recovery of two model horizontal-axis tidal stream turbines measured in a laboratory flume with Particle Image Velocimetry. Journal of Hydro-environment Research, 19, 179-188. https://doi.org/10.1016/j.jher.2017.03.003

© 2017 International Association for Hydro-environment Engineering and Research, Asia Pacific Division. The uptake of tidal stream-turbine (TST) technology lags other renewable energy sources despite the advantages of predictability, stability and in... Read More about An investigation of the wake recovery of two model horizontal-axis tidal stream turbines measured in a laboratory flume with Particle Image Velocimetry.

Modelling tidal stream turbines in a three-dimensional wave-current fully coupled oceanographic model (2017)
Journal Article
Li, X., Li, M., McLelland, S. J., Jordan, L. B., Simmons, S. M., Amoudry, L. O., …Thorne, P. D. (2017). Modelling tidal stream turbines in a three-dimensional wave-current fully coupled oceanographic model. Renewable energy, 114, 297-307. https://doi.org/10.1016/j.renene.2017.02.033

© 2017 The Author(s) A tidal turbine simulation system is developed based on a three-dimensional oceanographic numerical model. Both the current and turbulent controlling equations are modified to account for impact of tidal turbines on water velocit... Read More about Modelling tidal stream turbines in a three-dimensional wave-current fully coupled oceanographic model.

The role of biophysical cohesion on subaqueous bed form size: COHESION IN SUBAQUEOUS BED FORMS (2016)
Journal Article
Parsons, D. R., Schindler, R. J., Hope, J. A., Malarkey, J., Baas, J. H., Peakall, J., …Thorne, P. D. (2016). The role of biophysical cohesion on subaqueous bed form size: COHESION IN SUBAQUEOUS BED FORMS. Geophysical research letters, 43(4), 1566-1573. https://doi.org/10.1002/2016gl067667

Biologically active, fine-grained sediment forms abundant sedimentary deposits on Earth's surface, and mixed mud-sand dominates many coasts, deltas, and estuaries. Our predictions of sediment transport and bed roughness in these environments presentl... Read More about The role of biophysical cohesion on subaqueous bed form size: COHESION IN SUBAQUEOUS BED FORMS.