Heather Stewart

Photo of PhD studentPhD Student

Supervisors:
Dr Tom Bradwell (University of Stirling)
Dr Margaret Stewart (BGS)
Prof. Colm O’Cofaigh (Durham University)

Start Date: 1st October 2015

3A124B Cottrell Building
Biological & Environmental Sciences
Faculty of Natural Sciences
University of Stirling
Stirling, Scotland, FK9 4LA

Tel: +44 (0)1786 466544
fax: +(44) 1786 467843
email: h.a.stewart@stir.ac.uk
Twitter: @HeatherMarGeo

Research Project

Ice streaming, ice sheet deglaciation, and substrate properties, North Sea Basin, UK

The overarching aim of this project is to study the impact of glacial/interglacial cycles and ice streaming on the Quaternary landforms and sediments in the North Sea Basin. Improved understanding of these marine sediments and their geomorphology will inform the distribution of sea-bed habitats, geohazards, resources, site selection for offshore renewables, and climate change.

An improved understanding of the past cycles of glaciation, timing and extent, has far reaching implications for better understanding global climate change and ice-sheet behaviour. The 1000 metre-thick Quaternary sediment sequence of the North Sea Basin forms the overburden and geological seals to underlying CO2 storage complexes and migration pathways (e.g. thief zones) for fluids. These Quaternary strata form the foundations for offshore renewable installations and infrastructure for hydrocarbon exploration and extraction. The impact on geotechnical properties of glacial loading and unloading and lateral variation in these deposits is an important consideration for offshore development. These cycles of loading and unloading of ice also impact fluid release from the sub-surface and therefore geohazard assessment. Glacial geomorphology shapes the current sea-bed topography and glacial deposits determine sea-bed composition which impacts on the benthic community composition and distribution. These deposits also form commercially valuable aggregate resources.‌

Funding Acknowledgement

My studies are funded by the British Geological Survey.

Links

My British Geological Survey Homepage

Check me out on ResearchGate

Follow me on Twitter

Check out our International Ocean Discovery Program Proposal (#852-CPP) to core the 1000 metre thick Quaternary sediments of the North Sea Basin

Relevant Publications

Stewart, H A, Carter, G D O, Dove, D, Stewart, M A, Stoker, M S, Green, S L, Cotterill, C J, and Gafeira, J. Submitted. The Quaternary of Scotland: the offshore record. Earth and Environmental Science Transactions of the Royal Society of Edinburgh.

Stewart, H A, Bradwell, T, Stewart, M A, and Ó Cofaigh, C. In Prep. Submarine evidence of ice-streaming and ice-sheet re-advance of the British Ice Sheet, offshore eastern Scotland and north-eastern England.

Stewart, H A, and Long, D. 2016. Glacigenic debris flows observed in 3D seismic high-resolution seafloor imagery, Faroe–Shetland Channel, NE Atlantic. From: Dowdeswell, J A, Canals, M, Jakobsson, M, Todd, B J, Dowdeswell, E K and Hogan, K A (eds). Atlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient. Geological Society, London, Memoirs, 46, 361-362. © The Geological Society of London, 2016. DOI: 1144/M46.94 

Conferences and Presentations

Stewart, H A, Jamieson, A J, Ó Cofaigh, C, and Bradwell, T. 2017. Glacigenic debris-flows and down-slope gullies: evidence of a grounded ice margin during past glacials, South Shetland Trench, Antarctica. [Poster] In: Marine Geological and Biological Habitat Mapping 16th International Symposium, Halifax, Canada, 1-5th May 2017. Page 111 in Todd, B.J., et al., 2017. Program and Abstracts, 2017 GeoHab Conference, Dartmouth, Nova Scotia; Geological Survey of Canada, Open File 8295, 122 p. doi:10.4095/305398

Stewart, H A, and Jamieson, A J. Insights from the PharmaDEEP Expedition to the South Shetland Trench in the sub-Antarctic. [Oral] In: Marine Geological and Biological Habitat Mapping 16th International Symposium, Halifax, Canada, 1-5th May 2017. Page 110 in Todd, B.J., et al., 2017. Program and Abstracts, 2017 GeoHab Conference, Dartmouth, Nova Scotia; Geological Survey of Canada, Open File 8295, 122 p. doi:10.4095/305398

Stewart, H A, Bradwell, T, Stewart, M A, and Ó Cofaigh, C. 2016. Submarine evidence of ice-streaming and ice-sheet re-advance of the British Ice Sheet, offshore eastern Scotland and north-eastern England. [Oral] In: University of Stirling Biological and Environmental Sciences Postgraduate Winter Symposium, University of Stirling, 5-6th December 2016. doi: 10.13140/RG.2.2.36527.74408 http://nora.nerc.ac.uk/515527/

Stewart, H A, Bradwell, T, Stewart, M A, and Ó Cofaigh, C. 2016. Ice sheet dynamics of the western North Sea Basin: Shallow seafloor glacial landforms preserved offshore eastern Scotland and northeastern England. [Oral] In: William Smith Meeting 2016 – Glaciated Margins: The Sedimentary and Geophysical Archive, 2-3 June 2016, Geological Society of London, London, UK.

Stewart, H A, Jamieson, A J, Ó Cofaigh, C, Stewart, M A, and Bradwell, T. 2016. Continental slope records indicate a grounded ice sheet margin during past glacials, South Shetland Trench, Antarctica. [Poster] In: William Smith Meeting 2016 – Glaciated Margins: The Sedimentary and Geophysical Archive, 2-3 June 2016, Geological Society of London, London, UK. doi: 10.13140/RG.2.1.1485.5284 http://nora.nerc.ac.uk/515528/

Stewart, H A, on behalf of the Glacistore Consortium. 2016. Understanding Late Cenozoic glaciation and basin processes: implications for offshore CO2 storage (North Sea). International Ocean Discovery Program (IODP) proposal #852-CPP. [Poster] In: William Smith Meeting 2016 – Glaciated Margins: The Sedimentary and Geophysical Archive, 2-3 June 2016, Geological Society of London, London, UK.

Stewart, H A, Bradwell, T, Stewart, M A, and Ó Cofaigh, C. 2015. Filling the gaps: ice sheet dynamics of the western North Sea Basin. [Poster] In: University of Stirling Biological and Environmental Sciences Postgraduate Winter Symposium, University of Stirling, 8-9th December 2015. (Unpublished) doi: 10.13140/RG.2.1.1472.6160 http://nora.nerc.ac.uk/512666/

Contributed Conference Items

Grimoldi, E, Roberts, D H, Evans, D J A, Stewart, H A, Sejrup, H P, Hjelstuen, B O B, Haflidason, H, and Clark, C. 2016. Reconstruction of the Final Phases of Activity and Retreat of the North Sea Lobe Ice Stream during the Late Devensian. Abstract presented at the 2016 Fall Meeting, American Geophysical Union, San Francisco, USA, 12th-16th December 2016. [Poster Presentation by E Grimoldi]

Roberts, D, Evans, D, Clark, C, Bateman, M, Livingston, S, Medialdea, A, Ó Cofaigh, C, Grimoldi, E, Callard, L, Dove, D, Stewart, H, Davies, B, and Chiverell, R. 2016. Ice Stream behaviour in the western sector of the North Sea during the end of the last glacial cycle. Geophysical Research Abstract, Vol. 18, EGU2016-1778-2. EGU General Assembly, 17th April – 22nd April, 2016. [Oral presentation by D Roberts]

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