Dr Jaco Baas

Uwch Ddarlithydd

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. 2024
  2. Wedi ei Dderbyn / Yn y wasg

    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 Maw 2024, (Wedi ei Dderbyn / Yn y wasg) Yn: Journal of the Geological Society.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    On the origin of chevron marks and striated grooves, and their use in predicting mud bed rheology

    McGowan, D., Salian, A., Baas, J., Peakall, J. & Best, J., Chwef 2024, Sedimentology, 71, 2, t. 687-708 22 t.

    Allbwn ymchwil: Cyfraniad at gyhoeddiad arbenigolErthygl

  4. Cyhoeddwyd

    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 Ion 2024, Yn: Earth Surface Dynamics. 12, t. 231-247

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. 2023
  6. Cyhoeddwyd

    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., Awst 2023, Yn: Journal of Geophysical Research: Earth Surface. 128, 8, e2022JF006781.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

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

    Baker, M. L. & Baas, J., Chwef 2023, Yn: Sedimentology. 70, 4, t. 1110-1130 21 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. 2022
  9. Cyhoeddwyd

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

    Sobocinska, A. & Baas, J., 1 Hyd 2022, Yn: Marine Geology. 452, 106904.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    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., Medi 2022, Yn: Journal of Geophysical Research: Earth Surface. 127, 9, t. e2022JF006771 e2022JF006771.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    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., Meh 2022, Yn: The Depositional Record. 8, 2, t. 603-615 13 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. 2021
  13. Cyhoeddwyd

    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 Tach 2021, Yn: Frontiers Earth Science. 9, 747567.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    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 Hyd 2021, Yn: Journal of Sedimentary Research. 91, 9, t. 986–1009

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Rapid gravity flow transformation revealed in a single climbing ripple

    Baas, J. H., Best, J. & Peakall, J., 1 Mai 2021, Yn: Geology. 49, 5, t. 493-497

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. 2020
  17. Cyhoeddwyd

    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., Hyd 2020, Yn: Limnology and Oceanography. 65, 10, t. 2403-2419

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    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., Awst 2020, Yn: Sedimentology. 67, 5, t. 2645-2671 27 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    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., Meh 2020, Yn: Sedimentology. 67, 4, t. 1601-1666 66 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    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., Ion 2020, Yn: Geology. 48, 1, t. 72-76

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. 2019
  22. Cyhoeddwyd

    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., Rhag 2019, Yn: Sedimentology. 66, 7, t. 2749-2768 20 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    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., Tach 2019, Yn: Journal of Sedimentary Research. 89, 11, t. 1127-1139

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    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., Ebr 2019, Yn: Marine Geology. 410, t. 22-31

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. 2018
  26. Cyhoeddwyd

    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., Tach 2018, Yn: Journal of Geophysical Research: Earth Surface. 123, 11, t. 2784-2801 35 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    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 Awst 2018, Yn: Geomorphology. 315, t. 17-32 66 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. 2017
  29. Cyhoeddwyd

    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, Yn: Journal of Sedimentary Research. 87, 11, t. 1176-1195 59 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  30. 2016
  31. Cyhoeddwyd

    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 Rhag 2016, Yn: Sedimentology. 63, 7, t. 2002-2036

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Comparing the transitional behaviour of kaolinite and bentonite suspension flows

    Baas, J., Best, J. L. & Peakall, J., Hyd 2016, Yn: Earth Surface Processes and Landforms. 41, 13, t. 1911-1921

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd
  34. Cyhoeddwyd

    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 Ion 2016, Yn: Geophysical Research Letters. 43, t. 1566-1573

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

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

    Baas, J. H., Best, J. L. & Peakall, J., Ion 2016, Yn: Journal of the Geological Society. 173, 1, t. 12-45

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. 2015
  37. Cyhoeddwyd

    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 Maw 2015, Yn: Geology.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    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 Chwef 2015, Yn: Nature Communications. 6, 6257

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. 2014
  40. Cyhoeddwyd

    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 Tach 2014, Yn: PLoS ONE. 9, 11

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Wave ripples in mixtures of cohesive clay and cohesionless sand: Preliminary results

    Baas, J. H., Westlake, A., Eggenhuisen, J., Amoudry, L., Cartigny, M., Coultish, N., McLelland, S., Mouazé, D., Murphy, B., Parsons, D., Rosewell, K., Ruessink, G., Schrijvershof, R., Wu, X. & Ye, L., 1 Gorff 2014.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  42. Cyhoeddwyd

    Processes and products of turbidity currents entering soft muddy substrates

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

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. 2013
  44. Cyhoeddwyd

    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 Ion 2013, Yn: Geomorphology. 182, t. 19-32

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. 2012
  46. Cyhoeddwyd

    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 Chwef 2012, Yn: Marine Geology. 295-298, t. 95-112

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. 2011
  48. Cyhoeddwyd

    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 Rhag 2011, Yn: Sedimentology. 58, 7, t. 1953-1987

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. 2009
  50. Cyhoeddwyd

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

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

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  51. 2008
  52. Cyhoeddwyd

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

    Baas, J. H. & Best, J. L., 1 Meh 2008, Yn: Sedimentology. 55, 3, t. 635-66

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  53. Cyhoeddwyd

    Comparing flume and computer simulated turbidite flows – Implications for sediment deposition patterns and reservoir quality.

    Bond, C. E., Baas, J. H., Vinnels, J., McCaffrey, W., Waltham, D. & McClean, S., 1 Ion 2008.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  54. Cyhoeddwyd

    Coupling flow and deposit properties of partly cohesive high-density turbidity currents: An experimental approach.

    Manica, R., Baas, J. H., Peakall, J., Maestri, R. D. & Borges, A. O., 1 Ion 2008.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  55. Cyhoeddwyd

    Flow behaviour of ponded turbidity currents: an experimental study.

    Patacci, M., McCaffrey, W. M., Haughton, P., Baas, J. H. & Keevil, G., 1 Ion 2008.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  56. Cyhoeddwyd

    On the flow of natural clay suspensions over smooth and rough beds.

    Baas, J. H. & Best, J. L., 1 Ion 2008.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  57. Cyhoeddwyd
  58. 2007
  59. Cyhoeddwyd

    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 Tach 2007, Yn: Sedimentary Geology. 202, 1-2, t. 1-4

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  60. Cyhoeddwyd

    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 Mai 2007, Yn: Earth Science Reviews. 82, 1-2, t. 101-142

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  61. Cyhoeddwyd

    Handbook of Clay Science, by F. Bergaya, B.K.G. Theng & G. Lagaly - Book Review

    Baas, J. H., 1 Maw 2007, Unknown.

    Allbwn ymchwil: Cyfraniad arallCyfraniad Arall

  62. Cyhoeddwyd

    Bedform development below transient turbulent, partly cohesive open-channel flows.

    Baas, J. H., Best, J. L. & Kellman, P., 1 Ion 2007.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  63. Cyhoeddwyd

    Can vertical stacking of low-angle bedforms produce rhythmic bedding in slurry flow deposits?

    Baas, J. H., Best, J. L. & Peakall, J., 1 Ion 2007.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  64. Cyhoeddwyd

    Modelling rheological and turbulence regimes in kaolinite-rich sediment flows.

    Silva Jacinto, R. & Baas, J. H., 1 Ion 2007.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  65. Cyhoeddwyd

    Suspended and bedload dynamics in a tidally influenced river: the river Dyfi, Wales, UK.

    Brewer, P., Vericat, D., Baas, J. H., Jago, C. F., Brasington, J., Wheaton, J. M. & Causer, F., 1 Ion 2007.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  66. 2006
  67. Cyhoeddwyd

    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 Hyd 2006, Yn: Particle and Particle Systems Characterization. 23, 3-4, t. 313-320

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  68. Cyhoeddwyd

    Physical Processes in Earth and Environmental Sciences, by M. Leeder & M. Pérez-Arlucea

    Baas, J. H., 1 Medi 2006, Unknown.

    Allbwn ymchwil: Cyfraniad arallCyfraniad Arall

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