Dr Megan Baker
2019 – present: Postdoctoral Research Associate, Durham University
2015 - 2019: PhD - Bangor University
Thesis:“The Role of Clay Minerals on Sediment Gravity Flow Dynamics and Deposits”
2014 - 2015: MSc - Applied Marine Geoscience, Bangor University
2011 - 2014: BSc (Hons) – Ocean Science, Bangor University
My research focuses on understanding sediment gravity flow dynamics and deposits. I am particularly interested in what controls sediment gravity flow behaviour (such as sediment type and concentration), how these flows evolve in space and time, and how the flow behaviour is recorded in the deposits.
I currently work as a postdoctoral research associate on the NERC-funded project How do deep-ocean turbidity currents behave that form the largest sediment accumulations on Earth?. This projects aims to make the first detailed measurements of sediment gravity flows (also called turbidity currents) in the deep ocean by studying the Congo Canyon off West Africa, which acts as a funnel for sediment gravity flows. The project uses downward-pointing acoustic Doppler current profilers (ADCPs) that are suspended above the flows to measure velocity, turbulence and sediment concentration structures. I will look at the data collected by the ADCPs and also investigate sediment cores collected from the Congo Canyon.
My PhD researched clay-laden cohesive sediment gravity flows through a combination of fieldwork and laboratory flume experiments. Cohesive sediment gravity flows are complex because of the unique ability of suspended clay minerals to form flocs and gels, which can increase the viscosity of sediment gravity flows and change the fluid dynamics. Using laboratory experiments I determined that the effect of clay mineral type on the flow behaviour and deposit properties of clay-rich sediment gravity flows is significant and can be predicted using the rheological properties of the starting suspensions. Another part of my PhD was based on geological fieldwork from which I identified a variety of novel mixed sand-mud bedforms in the distal part of the submarine fan that makes up the Aberystwyth Grits Group and Borth Mudstone Formation in mid-Wales. I interpreted that these bedforms were deposited by sediment gravity flows where cohesive clay modified the fluid dynamics.
Department of Geography
- 1: Baker, Megan L. & Baas, Jaco H (2020). Mixed sand–mud bedforms produced by transient turbulent flows in the fringe of submarine fans: Indicators of flow transformation. Sedimentology 67(5): 2645-2671.
- 2: Craig, Melissa J., Baas, Jaco H., Amos, Kathryn J., Strachan, Lorna J., Manning, Andrew J., Paterson, David M., Hope, Julie A., Nodder, Scott D. & Baker, Megan L. (2020). Biomediation of submarine sediment gravity flow dynamics. Geology 48(1): 72-76.
- 3: Baas, Jaco H., Baker, Megan L., Malarkey, Jonathan, Bass, Sarah J., Manning, Andrew J., Hope, Julie A., Peakall, Jeffrey, Lichtman, Ian D., Ye, Leiping, Davies, Alan G., Parsons, Daniel R., Paterson, David M. & Thorne, Peter D. (2019). Integrating field and laboratory approaches for ripple development in mixed sand–clay–EPS. Sedimentology 66(7): 2749.
- 4: Baker, Megan L., Baas, Jaco H., Malarkey, Jonathan, Jacinto, Ricardo Silva, Craig, Melissa J., Kane, Ian A. & Barker, Simon (2017). The Effect of Clay Type On the Properties of Cohesive Sediment Gravity Flows and Their Deposits. Journal of Sedimentary Research 87(11): 1176.