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. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

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  7. 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

  8. 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

  9. Cyhoeddwyd

    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 Awst 2005, Yn: Sedimentary Geology. 179, 1-2, t. 49-69

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. 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

  11. Cyhoeddwyd

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

    Baas, J. H., 1 Ebr 2004, Yn: Sedimentary Geology. 166, 3-4, t. 292-310

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    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 Ion 2005, Yn: Journal of Geophysical Research - Oceans. 110, c11, t. C11015

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  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

    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

  15. Cyhoeddwyd

    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 Hyd 2004, Yn: Sedimentology. 51, 5, t. 1053-1088

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. 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

  17. 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

  18. 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

  19. Cyhoeddwyd

    Duration of deposition from decelerating high-density turbidity currents.

    Baas, J. H., Van Dam, R. L. & Storms, J. E., 1 Hyd 2000, Yn: Sedimentary Geology. 136, 1-2, t. 71-88

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. 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

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  21. Cyhoeddwyd

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

    Baas, J. H., 1 Maw 2000, Yn: Computers and Geosciences. 26, 2, t. 153-166

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Earth Science Editorial.

    Baas, J. H., 1 Chwef 2004, Yn: Annals of the Marie Curie Fellowships. 3, t. 42

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    Earth Science Editorial.

    Baas, J. H., 1 Gorff 2002, Yn: Annals of the Marie Curie Fellowships. 2, t. 34

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. 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

  25. 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

  26. Cyhoeddwyd

    Fine sediment in mixed sand-silt environments impact bedform geometry by altering sediment mobility

    de Lange, S. L., Niesten, I., van de Veen, S. H. J., Baas, J., Lammers, J., Waldschlaeger, K., Boelee, D. & Hoitink, A. J. F., Gorff 2024, Yn: Water Resources Research. 60, 7, e2024WR037065.

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  27. Cyhoeddwyd

    Flow-induced Interfacial Deformation Structures (FIDS): Implications for the interpretation of palaeocurrents, flow dynamics and substrate rheology

    Peakall, J., Best, J., Baas, J., Wignall, P. B., Hodgson, D. M. & Łapcik, P., Hyd 2024, Yn: Sedimentology. 71, 6, t. 1709-1743

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  28. 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

  29. 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.

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  30. E-gyhoeddi cyn argraffu

    Integrating transitional-flow signatures into hybrid event beds: Implications for hybrid flow evolution on a submarine lobe fringe

    Łapcik, P. & Baas, J., 4 Medi 2024, (E-gyhoeddi cyn argraffu) Yn: Journal of Sedimentary Research.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. 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

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  32. Cyhoeddwyd

    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., 10 Mai 2024, Yn: Journal of the Geological Society. 181, 4, jgs2023-155.

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  33. 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

  34. 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

  35. Cyhoeddwyd

    Preservation of groove mark striae formed by armoured mud clasts: the role of armour sediment size and bed yield stress

    Lock, C., Reid, M., Baas, J. & Peakall, J., Medi 2024, Yn: The Depositional Record. 10, 4, t. 426-440

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. 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

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  37. 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

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  38. 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

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  39. Cyhoeddwyd

    Ripple formation induced by biogenic mounds – Comment

    Baas, J. H. & Best, J. L., 15 Awst 2000, Yn: Marine Geology. 168, 1-4, t. 145-151

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  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

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  41. Cyhoeddwyd

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

    Baas, J. H., 1 Awst 2005, Yn: Sedimentary Geology. 179, 1-2, t. 1-3

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  42. 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

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  43. Cyhoeddwyd

    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 Meh 2003, Yn: Marine and Petroleum Geology. 20, 6-8, t. 851-860

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. 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.

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  45. 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.

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  46. Cyhoeddwyd

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

    Baas, J. H., McCaffrey, W. D. & Knipe, R. J., 1 Tach 2005, Yn: Petroleum Geoscience. 11, 4, t. 309-320

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  47. 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.

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  48. 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

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  49. 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

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  50. 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

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  51. 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

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