Dr Jaco Baas

Reader in Ocean Sciences

Contact info

Position: Reader

Room: 305 Craig Mair

Phone: 01248 382894

E-mail: j.baas@bangor.ac.uk

Web: Google Scholar, ResearchGate

I am Reader in Fine Particle Dynamics in the School of Ocean Sciences, and specialise in the erosion, transport, and deposition of fine, cohesive sediment. I graduated from the University of Utrecht (the Netherlands) with a combined BSc/MSc in Sedimentary Geology in 1988. At the same university, I completed my PhD in Bedform Dynamics in 1993. Subsequently, I was Postdoctoral Research Fellow at Geomar Research Centre in Kiel, Germany (studying Late-Pleistocene climate signals in slope sediments from the North-Atlantic continental margin), at the University of Rouen, France (on resuspension processes in the Seine estuary and gravel mining in the English Channel), and at the University of Bergen, Norway (investigating grain orientations in turbidite deposits).

In 1998, I moved to the School of Earth and Environment at the University of Leeds, where I started as a Marie Curie Research Fellow and then became a Senior Research Fellow. My research in Leeds included the physical properties of particulate density currents and their deposits and the dynamics of turbulence-modulated flows carrying cohesive clay particles. I took up my present post in Bangor in January 2007.

I am a process sedimentologist with more than 25 years of experience in sediment transport in fluvial, shallow marine, and deep-marine environments. My main fundamental and applied research interests include physical and biological cohesion in fine-grained sediment, the dynamics of sedimentary bedforms, and sediment gravity flows in the deep ocean, but my expertise also stretches to hydraulic engineering, palaeoclimatology, and mathematical modelling. I combine experimental research with field work to answer timely research questions, taking a blue-skies approach as well as collaborating with industry.

Research Area

Sediment Dynamics and Morphology

  1. Article › Research › Peer-reviewed
  2. Published

    A phase diagram for turbulent, transitional and laminar clay suspension flows.

    Baas, J. H., Best, J. L., Peakall, J. & Wang, M., 1 Mar 2009, In: Journal of Sedimentary Research. 79, 3-4, p. 162-183

    Research output: Contribution to journalArticlepeer-review

  3. Published

    An integrated process-based model of flutes and tool marks in deep-water environments: implications for palaeohydraulics, the Bouma sequence, and hybrid event beds

    Peakall, J., Best, J., Baas, J. H., Hodgson, D. M., Clare, M. A., Talling, P. J., Dorrell, R. M. & Lee, D. R., Jun 2020, In: Sedimentology. 67, 4, p. 1601-1666 66 p.

    Research output: Contribution to journalArticlepeer-review

  4. Published

    Bedform development in mixed sand–mud: The contrasting role of cohesive forces in flow and bed

    Baas, J. H., Davies, A. G. & Malarkey, J., 15 Jan 2013, In: Geomorphology. 182, p. 19-32

    Research output: Contribution to journalArticlepeer-review

  5. Published

    Bedform migration in a mixed sand and cohesive clay intertidal environment and implications for bed material transport predictions

    Lichtman, I. D., Baas, J. H., Amoudry, L. O., Thorne, P. D., Malarkey, J., Hope, J. A., Peakall, J., Paterson, D. M., Bass, S. J., Cooke, R. D., Manning, A. J., Davies, A. G., Parsons, D. R. & Ye, L., 15 Aug 2018, In: Geomorphology. 315, p. 17-32 66 p.

    Research output: Contribution to journalArticlepeer-review

  6. Published

    Biomediation of submarine sediment gravity flow dynamics

    Craig, M., Baas, J. H., Amos, K. J., Strachan, L. J., Manning, A. J., Paterson, D. M., Hope, J. A., Nodder, S. D. & Baker, M. L., Jan 2020, In: Geology. 48, 1, p. 72-76

    Research output: Contribution to journalArticlepeer-review

  7. Published

    Blood, lead and spheres: a hindered settling equation for sedimentologists based on metadata analysis

    Baas, J. H., Baker, M. L., Buffon, P., Strachan, L. J., Bostock, H. C., Hodgson, D. M., Eggenhuisen, J. T. & Spychala, Y. T., Jun 2022, In: The Depositional Record. 8, 2, p. 603-615 13 p.

    Research output: Contribution to journalArticlepeer-review

  8. Published

    Comparing the transitional behaviour of kaolinite and bentonite suspension flows

    Baas, J., Best, J. L. & Peakall, J., Oct 2016, In: Earth Surface Processes and Landforms. 41, 13, p. 1911-1921

    Research output: Contribution to journalArticlepeer-review

  9. Published

    Comparison of spatio-temporal evolution of experimental particulate gravity flows at two different initial concentrations, based on velocity, grain size and density data.

    Choux, C. M., Baas, J. H., McCaffrey, W. D. & Haughton, P. D., 1 Aug 2005, In: Sedimentary Geology. 179, 1-2, p. 49-69

    Research output: Contribution to journalArticlepeer-review

  10. Published

    Concepts and applications of fluvial sedimentology: Towards interdisciplinary analysis of process and product.

    Weltje, G. J., Hoogendoorn, R. M., Marriott, S. B. & Baas, J. H., 15 Nov 2007, In: Sedimentary Geology. 202, 1-2, p. 1-4

    Research output: Contribution to journalArticlepeer-review

  11. Published

    Conditions for formation of massive turbiditic sandstones by primary depositional processes.

    Baas, J. H., 1 Apr 2004, In: Sedimentary Geology. 166, 3-4, p. 292-310

    Research output: Contribution to journalArticlepeer-review

  12. Published

    Coupling between suspended sediment distribution and turbulence structure in a laboratory turbidity current.

    Baas, J. H., McCaffrey, W. D., Haughton, P. D. & Choux, C., 1 Jan 2005, In: Journal of Geophysical Research - Oceans. 110, c11, p. C11015

    Research output: Contribution to journalArticlepeer-review

  13. Published

    Current- and Wave-Generated Bedforms on Mixed Sand–Clay Intertidal Flats: A New Bedform Phase Diagram and Implications for Bed Roughness and Preservation Potential

    Baas, J., Malarkey, J., Lichtman, I. D., Amoudry, L. O., Thorne, P., Hope, J. A., Peakall, J., Paterson, D. M., Bass, S., Cooke, R. D., Manning, A. J., Parsons, D. & Ye, L., 3 Nov 2021, In: Frontiers Earth Science. 9, 747567.

    Research output: Contribution to journalArticlepeer-review

  14. Published

    Depositional processes, bedform development and hybrid bed formation in rapidly decelerated cohesive (mud–sand) sediment flows

    Baas, J. H., Best, J. L. & Peakall, J., 1 Dec 2011, In: Sedimentology. 58, 7, p. 1953-1987

    Research output: Contribution to journalArticlepeer-review

  15. Published

    Deposits of depletive high-density turbidity currents: a flume analogue of bed geometry, structure and texture.

    Baas, J. H., Van Kesteren, W. & Postma, G., 1 Oct 2004, In: Sedimentology. 51, 5, p. 1053-1088

    Research output: Contribution to journalArticlepeer-review

  16. Published

    Directional petrological characterisation of deep-marine sandstones using grain fabric and permeability anisotropy: methodologies, theory, application and suggestions for integration.

    Baas, J. H., Hailwood, E. A., McCaffrey, W. D., Kay, M. & Jones, R., 1 May 2007, In: Earth Science Reviews. 82, 1-2, p. 101-142

    Research output: Contribution to journalArticlepeer-review

  17. Published

    Discontinuity in Equilibrium Wave–Current Ripple Size and Shape and Deep cleaning associated with Cohesive Sand–Clay Beds

    Wu, X., Fernández, R., Baas, J., Malarkey, J. & Parsons, D. R., Sept 2022, In: Journal of Geophysical Research: Earth Surface. 127, 9, p. e2022JF006771 e2022JF006771.

    Research output: Contribution to journalArticlepeer-review

  18. Published

    Does sand promote or hinder the mobility of cohesive sediment gravity flows?

    Baker, M. L. & Baas, J., Feb 2023, In: Sedimentology. 70, 4, p. 1110-1130 21 p.

    Research output: Contribution to journalArticlepeer-review

  19. Published

    Duration of deposition from decelerating high-density turbidity currents.

    Baas, J. H., Van Dam, R. L. & Storms, J. E., 1 Oct 2000, In: Sedimentary Geology. 136, 1-2, p. 71-88

    Research output: Contribution to journalArticlepeer-review

  20. Published

    Dynamics and deposition of sediment-bearing multi-pulsed flows and geological implication

    Ho, V. L., Dorrell, R. M., Keevil, G., Thomas, R. E., Burns, A. D., Baas, J. H. & McCaffrey, W. D., Nov 2019, In: Journal of Sedimentary Research. 89, 11, p. 1127-1139

    Research output: Contribution to journalArticlepeer-review

  21. Published

    EZ-ROSE: a computer program for equal-area circular histograms and statistical analysis of two-dimensional vectorial data.

    Baas, J. H., 1 Mar 2000, In: Computers and Geosciences. 26, 2, p. 153-166

    Research output: Contribution to journalArticlepeer-review

  22. Published

    Earth Science Editorial.

    Baas, J. H., 1 Feb 2004, In: Annals of the Marie Curie Fellowships. 3, p. 42

    Research output: Contribution to journalArticlepeer-review

  23. Published

    Earth Science Editorial.

    Baas, J. H., 1 Jul 2002, In: Annals of the Marie Curie Fellowships. 2, p. 34

    Research output: Contribution to journalArticlepeer-review

  24. Published

    Effect of biological polymers on mobility and run-out distance of cohesive and non-cohesive sediment gravity flows

    Sobocinska, A. & Baas, J., 1 Oct 2022, In: Marine Geology. 452, 106904.

    Research output: Contribution to journalArticlepeer-review

  25. Published

    Electrical resistance tomography for suspended sediment measurements in open channel flows using a novel sensor design.

    Schlaberg, H. I., Baas, J. H., Wang, M., Best, J. L., Williams, R. A. & Peakall, J., 1 Oct 2006, In: Particle and Particle Systems Characterization. 23, 3-4, p. 313-320

    Research output: Contribution to journalArticlepeer-review

  26. Published

    Influence of cohesive clay on wave–current ripple dynamics captured in a 3D phase diagram

    Xuxu, W., Malarkey, J., Fernández, R., Baas, J., Pollard, E. & Parsons, D., 30 Jan 2024, In: Earth Surface Dynamics. 12, p. 231-247

    Research output: Contribution to journalArticlepeer-review

  27. Published

    Integrating field and laboratory approaches for ripple development in mixed sand-clay-EPS

    Baas, J. H., Baker, M., Malarkey, J., Bass, S. J., Manning, A. J., Hope, J. A., Peakall, J., Lichtman, I., Ye, L., Davies, A., Parsons, D. R., Paterson, D. M. & Thorne, P. D., Dec 2019, In: Sedimentology. 66, 7, p. 2749-2768 20 p.

    Research output: Contribution to journalArticlepeer-review

  28. Published

    Interactions between sediment microbial ecology and physical dynamics drive heterogeneity in contextually similar depositional systems

    Hope, J. A., Malarkey, J., Baas, J. H., Peakall, J., Parsons, D., Manning, A. J., Bass, S., Lichtman, I., Thorne, P., Ye, L. & Paterson, D. M., Oct 2020, In: Limnology and Oceanography. 65, 10, p. 2403-2419

    Research output: Contribution to journalArticlepeer-review

  29. Accepted/In press

    Marine redox dynamics and biotic response to the mid-Silurian Ireviken Extinction Event in a mid-shelf setting

    Wang, Y., Wignall, P. B., Xiong, Y., Loydell, D. K., Peakall, J., Baas, J. H., Mills, B. J. W. & Poulton, S. W., 13 Mar 2024, (Accepted/In press) In: Journal of the Geological Society.

    Research output: Contribution to journalArticlepeer-review

  30. Published

    Mixed Sand—Mud Bedforms Produced by Transient Turbulent Flows in the Fringe of Submarine Fans: Indicators of Flow Transformation

    Baker, M. L. & Baas, J. H., Aug 2020, In: Sedimentology. 67, 5, p. 2645-2671 27 p.

    Research output: Contribution to journalArticlepeer-review

  31. Published

    Predicting bedforms and primary current stratification in cohesive mixtures of mud and sand

    Baas, J. H., Best, J. L. & Peakall, J., Jan 2016, In: Journal of the Geological Society. 173, 1, p. 12-45

    Research output: Contribution to journalArticlepeer-review

  32. Published

    Processes and products of turbidity currents entering soft muddy substrates

    Baas, J. H., Manica, R., Puhl, E., Verhagen, I. & de O.Borges, A. L., May 2014, In: Geology. 42, 5, p. 371-374

    Research output: Contribution to journalArticlepeer-review

  33. Published

    Rapid gravity flow transformation revealed in a single climbing ripple

    Baas, J. H., Best, J. & Peakall, J., 1 May 2021, In: Geology. 49, 5, p. 493-497

    Research output: Contribution to journalArticlepeer-review

  34. Published

    Reversed sediment wave migration in the Irish Sea, NW Europe: A reappraisal of the validity of geometry-based predictive modelling and assumptions

    Van Landeghem, K. J., Baas, J. H., Mitchell, N., Wilcockson, D. & Wheeler, A. J., 15 Feb 2012, In: Marine Geology. 295-298, p. 95-112

    Research output: Contribution to journalArticlepeer-review

  35. Published

    Ripple formation induced by biogenic mounds – Comment

    Baas, J. H. & Best, J. L., 15 Aug 2000, In: Marine Geology. 168, 1-4, p. 145-151

    Research output: Contribution to journalArticlepeer-review

  36. Published

    Sediment Composition Influences Spatial Variation in the Abundance of Human Pathogen Indicator Bacteria within an Estuarine Environment

    Perkins, T. L., Clements, K., Baas, J. H., Jago, C. F., Jones, D. L., Malham, S. K. & McDonald, J. E., 14 Nov 2014, In: PLoS ONE. 9, 11

    Research output: Contribution to journalArticlepeer-review

  37. Published

    Sediment gravity flows: Recent advances in process and field analysis – Introduction

    Baas, J. H., 1 Aug 2005, In: Sedimentary Geology. 179, 1-2, p. 1-3

    Research output: Contribution to journalArticlepeer-review

  38. Published

    Sole marks reveal deep-marine depositional process and environment: implications for flow transformation and hybrid event bed models

    Baas, J., Tracey, N. D. & Peakall, J., 4 Oct 2021, In: Journal of Sedimentary Research. 91, 9, p. 986–1009

    Research output: Contribution to journalArticlepeer-review

  39. Published

    Spatio-temporal evolution of velocity structure, concentration and grainsize stratification within experimental particulate gravity currents.

    McCaffrey, W. D., Choux, C. M., Baas, J. H. & Haughton, P. D., 1 Jun 2003, In: Marine and Petroleum Geology. 20, 6-8, p. 851-860

    Research output: Contribution to journalArticlepeer-review

  40. Published

    Sticky stuff: Redefining bedform prediction in modern and ancient environments

    Schindler, R. J., Parsons, D. R., Ye, L., Hope, J. A., Baas, J. H., Peakall, J., Manning, A. J., Aspden, R. J., Malarkey, J., Simmons, S., Paterson, D. M., Lichtman, I. D., Davies, A. G., Thorne, P. D. & Bass, S. J., 27 Mar 2015, In: Geology.

    Research output: Contribution to journalArticlepeer-review

  41. Published

    Streamwise turbulence modulation in non-uniform open-channel clay suspension flows

    de Vet, M. G. W., Fernandez, R., Baas, J. H., McCaffrey, W. D. & Dorrell, R. M., Aug 2023, In: Journal of Geophysical Research: Earth Surface. 128, 8, e2022JF006781.

    Research output: Contribution to journalArticlepeer-review

  42. Published

    The Deep-Water Architecture Knowledge Base: Towards objective comparison of deep-marine sedimentary systems.

    Baas, J. H., McCaffrey, W. D. & Knipe, R. J., 1 Nov 2005, In: Petroleum Geoscience. 11, 4, p. 309-320

    Research output: Contribution to journalArticlepeer-review

  43. Published

    The Effect of Clay Type on the Properties of Cohesive Sediment Gravity Flows and their Deposits

    Baker, M. L., Baas, J. H., Malarkey, J., Silva Jacinto, R., Craig, M. J., Kane, I. A. & Barker, S., 2017, In: Journal of Sedimentary Research. 87, 11, p. 1176-1195 59 p.

    Research output: Contribution to journalArticlepeer-review

  44. Published

    The dynamics of turbulent, transitional and laminar clay-laden flow over a fixed current ripple.

    Baas, J. H. & Best, J. L., 1 Jun 2008, In: Sedimentology. 55, 3, p. 635-66

    Research output: Contribution to journalArticlepeer-review

  45. Published

    The hiding-exposure effect revisited: A method to calculate the mobility of bimodal sediment mixtures

    McCarron, C. J., Van Landeghem, K. J. J., Baas, J. H., Amoudry, L. O. & Malarkey, J., Apr 2019, In: Marine Geology. 410, p. 22-31

    Research output: Contribution to journalArticlepeer-review

  46. Published

    The pervasive role of biological cohesion in bedform development

    Malarkey, J., Baas, J. H., Hope, J. A., Aspenden, R. J., Parsons, D. R., Peakall, J., Peterson, D. M., Schindler, R. J., Ye, L., Lichtman, I. D., Bass, S. J., Davies, A. G., Manning, A. J. & Thorne, P. D., 6 Feb 2015, In: Nature Communications. 6, 6257

    Research output: Contribution to journalArticlepeer-review

  47. Published

    The role of biophysical cohesion on subaqueous bed form size

    Parsons, D. R., Schindler, R. J., Hope, J. A., Malarkey, J., Baas, J. H., Peakall, J., Manning, A. L., Ye, L., Simmons, S., Paterson, D. M., Aspden, R. J., Bass, S. J., Davies, A. G., Lichtman, I. D. & Thorne, P. D., 28 Jan 2016, In: Geophysical Research Letters. 43, p. 1566-1573

    Research output: Contribution to journalArticlepeer-review

  48. Published

    Thresholds of intrabed flow and other interactions of turbidity currents with soft muddy substrates

    Baas, J., Manica, R., Puhl, E. & Borges, A. L. D. O., 1 Dec 2016, In: Sedimentology. 63, 7, p. 2002-2036

    Research output: Contribution to journalArticlepeer-review

  49. Published

    Turbulence modulation in clay-rich sediment-laden flows and some implications for sediment deposition.

    Baas, J. H. & Best, J. L., 1 Jan 2002, In: Journal of Sedimentary Research. 72, 3, p. 336-340

    Research output: Contribution to journalArticlepeer-review

  50. Published

    Wave ripple development on mixed clay–sand substrates: Effects of clay winnowing and armoring

    Wu, X., Baas, J. H., Parsons, D. R., Eggenhuisen, J., Amoudry, L., Cartigny, M., McLelland, S., Mouazé, D. & Ruessink, G., Nov 2018, In: Journal of Geophysical Research: Earth Surface. 123, 11, p. 2784-2801 35 p.

    Research output: Contribution to journalArticlepeer-review

  51. Chapter › Research › Not peer-reviewed
  52. Published

    Experimental constraints on shear mixing rates and processes: implications for the dilution of submarine debris flows

    Talling, P. J., Peakall, J., Sparks, R. S., O'Cofaigh, C., Dowdeswell, J. A., Felix, M., Wynn, R. B., Baas, J. H., Hogg, A. J., Masson, D. G., Taylor, J. & Weaver, P. P., 1 Jan 2002, Glacier-Influenced Sedimentation on High-Latitude Continental Margins. 2002 ed. Geological Society Publishing House, p. 89-104

    Research output: Chapter in Book/Report/Conference proceedingChapter

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