School of Ocean Sciences

Dr Jaco H Baas

Photograph of Dr Jaco Baas


I am Senior Lecturer 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.

Current Research

  • Environmental application of field-based Ultrasonic Doppler Velocity Profiling (fUDVP) at the Centre for Catchment to Coast Research
  • NERC TransFlow project: Flow dynamics of clay-laden, open-channel flows across the transition from turbulent to laminar flow behaviour
  • The "Deep Water Architecture Knowledge Base" (DWAKB), a quantitative tool, based on knowledge base technology, for the comparison of deep-marine clastic depositional systems and the analysis of their architectural properties.
  • Directional petrological characterisation of deep-marine deposits by integrating grain shape fabric and permeability measurement techniques

Further details, including past research.

Esteem Indicators

NERC Peer Review College 2007-;

Editorships: Sedimentary Geology (Special Issues 2005 and 2007), Estuarine, Coastal & Shelf Science (Special Issue 2007);

Peer review of grant applications: NERC, Science Foundation Ireland, Dutch Technology Foundation STW;

Conference organisation: BSRG 2003, Challenger Society Meeting 2008; Invited presentations: AAPG (2005);

EUROMECH (2006);

Lorentz Institute Theoretical Physics (2006). Best poster award BSRG (2004). Citations: Baas (2004) was at #7 in the top 25 of most downloaded papers of Sedimentary Geology between April 2004 and March 2005, and at #14 between Oct 2003 and Sept 2004, with more than 500 downloads.


Peer Reviewed Journal Papers

Malarkey, J., J.H. Baas, J.A. Hope, R.J. Aspden, D.R. Parsons, J. Peakall, D.M. Paterson, R.J. Schindler, L. Ye, I.D. Lichtman, S.J. Bass, A.G. Davies, A.J. Manning and P.D. Thorne, 2015.
The pervasive role of biological cohesion in bedform development. Nature Communications, 6:6257, doi: 10.1038/ncomms7257.
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Schindler, R.J., D.R. Parsons, L. Ye, J.A. Hope, J.H. Baas, J. Peakall, A.J. Manning, R.J. Aspden, J. Malarkey, S. Simmons, D.M. Patterson, I.D. Lichtman, A.G. Davies, P.D. Thorne and S.J. Bass, 2015.
Sticky stuff: redefining bedform prediction in modern and ancient environments. Geology, 43(5), 399-402.
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Baas, J.H., Manica, R., Puhl, E., Verhagen, I. and Borges, A.L.O. (2014)
Processes and products of turbidity currents entering soft muddy substrates. Geology, 42/5.

Baas, J.H., A.G. Davies and J. Malarkey, 2013.
Bedform development in mixed sand-mud: the contrasting role of cohesive forces in flow and bed. Geomorphology, 182, 19-32.

Van Landeghem, K.J.J., Baas, J.H., Mitchell, N.C, Wilcockson, D. and Wheeler, A.J. (2012)
Reversed sediment wave migration in the Irish Sea, NW Europe: a reappraisal of the validity of geometry-based predictive modelling and assumptions. Marine Geology 295-298, pp. 95-112

Yeganeh-Bakhtiary, A., Kazeminezhad, M.H., A. Etemad-Shahidi, A. and Baas, J.H., Cheng, L. (2011)
Euler-Euler two-phase flow simulation of tunnel erosion beneath marine pipelines. Applied Ocean Research.

Baas, J. H., Best, J. L. and Peakall, J. (2011)
Depositional processes, bedform development and hybrid bed formation in rapidly decelerated cohesive (mud-sand) sediment flows. Sedimentology. doi: 10.1111/j.1365-3091.2011.01247.x
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Baas, J.H. and Best, J.L. (2009)
On the flow of natural clay suspensions over smooth and rough beds. ERCOFTAC Bulletin, 78, 58-63.

Jaco H. Baas, James L. Best, Jeffrey Peakall, and Mi Wang (2009)
A Phase Diagram for Turbulent, Transitional, and Laminar Clay Suspension Flows Journal of Sedimentary Research 79: 162-183.

Baas, J.H. and Best, J.L. (2008)
The dynamics of turbulent, transitional and laminar clay-laden flow over a fixed current ripple. Sedimentology, v. 55, p. 635-666.

Weltje, G.J., Hoogendoorn, R.M., Marriott, S.B. and Baas, J.H. (2007)
Concepts and applications of fluvial sedimentology: Towards interdisciplinary analysis of process and product. Sedimentary Geology, 202, 1-4.

Baas, J.H., Hailwood, E.A., McCaffrey, W.D., Kay, M. and Jones, R. 2007
Directional petrological characterisation of deep-marine sandstones using grain fabric and permeability anisotropy: methodologies, theory, application and suggestions for integration. Earth-Science Reviews, 82, 101-142.

Schlaberg, H.I., Baas, J.H., Wang, M., Best, J.L., Williams, R.A. and Peakall, J. 2006
Electrical resistance tomography for suspended sediment measurements in open channel flows using a novel sensor design. Particle and Particle Systems Characterization, 23, 313-320.
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Baas, J.H. 2005
Sediment gravity flows: Recent advances in process and field analysis - introduction. Sedimentary Geology, 179, 1-3.
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Baas, J.H., McCaffrey, W.D. and Knipe, R. 2005
The Deep-Water Architecture Knowledge Base: Towards objective comparison of deep-marine sedimentary systems. Petroleum Geoscience, 11, 309-320.
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Baas, J.H., McCaffrey, W.D., Haughton, P.D.W. and Choux, C.M.A. 2005
Coupling between suspended sediment distribution and turbulence structure in a laboratory turbidity current. Journal of Geophysical Research, Oceans, 110, C11015, 20 pp.
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Choux, C.M.A., Baas, J.H., McCaffrey, W.D. and Haughton, P.D.W. 2005
Comparison of spatio-temporal evolution of experimental particulate gravity flows at two different initial concentrations, based on velocity, grain size and density data. Sedimentary Geology, 179, 49-69.

Schlaberg, H.I., Baas, J.H., Wang, M., Best, J.L., Williams, R.A. and Peakall, J. 2005
Detection and quantification of suspended sediment concentration and stratification in open channel flows: development and first results using electrical resistance tomography. Proceedings of the 4th World Congress on Industrial Process Tomography, 5-8 September 2005, Aizu, Japan.
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Baas, J.H. 2004
Conditions for formation of massive turbiditic sandstones by primary depositional processes. Sedimentary Geology, 166, 293-310.
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Baas, J.H. 2004
Earth Sciences editorial. Annals of the Marie Curie Fellowships, 3, 42.
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Baas, J.H., Van Kesteren, W. and Postma, G. 2004
Deposits of depletive high-density turbidity currents: A flume analogue of bed geometry, structure and texture. Sedimentology, 51, 1053-1088.
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Baas, J.H. 2003
Earth Science: towards convergence of scientific disciplines. Annals of the Marie Curie Fellowships, 2, 34.
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McCaffrey, W.D., Choux, C.M, Baas, J.H. and Haughton, P. 2003
Spatio-temporal evolution of velocity structure, concentration and grain-size stratification within experimental particulate gravity currents. Marine and Petroleum Geology, 20, 851-860.
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Baas, J.H. and Best, J.L. 2002
Turbulence modulation in clay-rich sediment-laden flows and some implications for sediment deposition. Journal of Sedimentary Research, 72, 336-340.
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Baas, J.H. 2000
EZ-ROSE: a computer program for equal-area circular histograms and statistical analysis of two-dimensional vectorial data. Computers and Geosciences, 26, 153-166.
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Baas, J.H. and Best, J.L. 2000
Ripple formation induced by biogenic mounds - Comment. Marine Geology, 168, 145-151.
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Baas, J.H., Van Dam, R.L. and Storms, J.E.A. 2000
Duration of deposition from decelerating high-density turbidity currents. Sedimentary Geology, 136, 71-88.
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Baas, J.H. 1999
An empirical model for the development and equilibrium morphology of current ripples in fine sand. Sedimentology, 46, 123-138.
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Abrantes, F., Baas, J.H., Haflidason, H., Rasmussen, T., Klitgaard, D., Loncaric, N. and Gaspar, L. 1998
Sediment fluxes along the northeastern European Margin: inferring hydrological changes between 20 and 8 kyr. Marine Geology, 152, 7-23.

Baas, J.H. and Schönfeld, J. 1998
Terrestrial record of Laurentide Ice Sheet reorganization during Heinrich events. Comment. Geology, 26, 666-667.

Baas, J.H., Schönfeld, J. and Zahn, R. 1998
Mid-depth oxygen drawdown during Heinrich events: evidence from benthic foraminiferal community structure, trace fossil tiering, and benthic d13C at the Portuguese margin. Marine Geology, 152, 25-55.

Loncaric, N., Auffret, G.A., Abrantes, F., Baas, J.H., Gaspar, L. and Pujol, C. 1998
Late Quaternary sedimentation patterns on the Meriadzek Terrace, Bay of Biscay (ESSCAMP 02 core: 47° N 9° W). Marine Geology, 152, 57-73.

Baas, J.H., Mienert, J., Abrantes, F. and Prins, M.A. 1997
Late-Quaternary sedimentation on the Portuguese continental margin: climate- related processes and products. Palaeogeography Palaeoclimatology Palaeoecology, 130, 1-23.

Baas, J.H. and De Koning, H. 1996
Washed-out ripples; their equilibrium dimensions, migration rate, and relation to suspended-sediment concentration in very fine sand: Reply. Journal of Sedimentary Research, A66, 290-291.

Baas, J.H. and De Koning, H. 1995
Washed-out ripples; their equilibrium dimensions, migration rate, and relation to suspended-sediment concentration in very fine sand. Journal of Sedimentary Research, A65, 431-435.

Baas, J.H. 1994
A flume study on the development and equilibrium morphology of small -scale bedforms in very fine sand. Sedimentology, 41, 185-209.

Oost, A.P. and Baas, J.H. 1994
The development of small scale bedforms in tidal environments: an empirical model and its applications. Sedimentology, 41, 883-903.

Baas, J.H. 1993
Dimensional Analysis of Current Ripples in Recent and Ancient Depositional Environments. Geologica Ultraiectina, 106, 199 pp.

Baas, J.H., Oost, A.P., Sztano, O.K., De Boer, P.L. and Postma, G. 1993
Time as an independent variable for current ripples developing towards linguoid equilibrium morphology. Terra Nova, 5, 29-35.

Mienert, J., Baas, J., Abrantes, F., Monteiro, J., Auffret, G.A., Kuijpers, A., Evans, D., Kenyon, N., Sejrup, H.-P. and Schultheiss, P. 1993
ENAM program investigates the North Atlantic Margin. EOS, Transactions of the American Geophysical Union, 74, 578.

Book Reviews

Baas, J.H. 2007
Handbook of Clay Science
, by F. Bergaya, B.K.G. Theng and G. Lagaly (Developments in Clay Science 1, Elsevier, Oxford, 645 pp).
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Baas, J.H. 2006
Physical Processes in Earth and Environmental Sciences
, by M. Leeder and M. Pérez-Arlucea (Blackwell Publishing, 321 pp).
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Baas, J.H. 2005
Introduction to the Physics of Cohesive Sediment Dynamics in the Marine Environment, by J.C.Winterwerp and C. Van Kesteren (Developments in Sedimentology 56, Elsevier, Amsterdam, 559 pp).
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Baas, J.H. and Strachan, L. 2005
Submarine Mass Movements and their Consequences, by J. Locat, and J. Mienert (Advances in Natural and Technological Hazards Research 19, Springer, 552 pp).
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Baas, J.H. 2004
Confined Turbidite Systems
, by S.A. Lomas and P. Joseph (Geological Society Special Publication 222, 336 pp).
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Baas, J.H. 2003
Muddy Coasts of the World: Processes, Deposits and Function
, by T. Healy, Y. Wang and J.-A. Healy (Elsevier, Amsterdam, 556 pp).
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Baas, J.H. 2003
Muddy Coasts of the World: Processes, Deposits and Function, by T. Healy, Y. Wang and J.-A. Healy (Elsevier, Amsterdam, 556 pp). In: Wadden Sea Newsletter, 28/1, 16.

Baas, J.H. and Felix, M. 2003
Fine Sediment Dynamics in the Marine Environment
, by J.C. Winterwerp and C. Kranenberg (Elsevier, Amsterdam, 730 pp).
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Book Chapters

Baas, J.H. 2003
Ripple, Ripple Mark, Ripple Structure. In: Encyclopedia of Sediments and Sedimentary Rocks (Ed. by G.V. Middleton), Kluwer Academic Publishers, Dordrecht, Netherlands, 565-568.
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Talling, P.J., Peakall, J., Sparks, R.S.J., ÓCofaigh, C., Dowdeswell, J.A., Felix, M., Wynn, R.B., Baas, J.H., Hogg, A.J., Masson, D.G. Taylor, J. and Weaver, P.P.E. 2002
Experimental constraints on shear mixing rates and processes: implications for the dilution of submarine debris flows. In: Glacier- Influenced Sedimentation on High-Latitude Continental Margins (Ed. by J.A. Dowdeswell and C. ÓCofaigh), Special Publication, Geological Society of London, 203, 89-103.

Baas, J., Hollender, F.-J., Bobsien, M., Baumgärtner, C. and Kenyon, N. 1993
Parasound and Hydrosweep profiling In: Nordatlantik 93, Cruise No. 26, 24 August - 26 November 1993 (Ed. by E. Suess, K. Kremling and J. Mienert). METEOR-Berichte, 94-4, 186-190.

Hollender, F.J., Baas, J., Bobsien, M. and Baumgärtner, C. 1993
Parasound and Hydrosweep profiling: Greenland Basin. In: Nordatlantik 93, Cruise No. 26, 24 August - 26 November 1993 (Ed. by E. Suess, K. Kremling and J. Mienert). METEOR-Berichte, 94-4, 93-95.

Additional Publications

Baas, J.H. 2003 (Editor)
BSRG Annual Meeting, School of Earth Sciences, University of Leeds, Dec. 20th to 22nd, 2003, Programme and Abstracts, 123 pp.

Baas, J.H. 2001
Sand Deposition from High-Density Turbidity Currents: Implications for the Emplacement Mode, Internal Structure, Texture and Geometry of Deep-Water Massive Sandstone Beds. Final Report of Consortium Project for Norske Conoco, Norsk Hydro and TotalFinaElf, 123 pp.

Baas, J.H. 2000
Experimental Research on Hydraulics and Depositional Mechanisms of High-Density Turbidity Currents. Final Report for TMR Marie Curie Fellowship Programme, European Union, Brussels, 187 pp.
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Baas, J.H. 1998
The Use of Fabric and Grain-Size Analysis to Distinguish between Deep-Marine Massive Sandstones of Turbiditic and Debris-Flow Origin. CONOCO-Report, Stavanger, 300 pp.

Baas, J.H. and Lafite, R. 1997
Etude du Dragage de Granulats Marins au large de Dieppe: L'Incidence sur le Regime Naturel des Houles et Impact Potentiel sur l'Erosion Littorale. G.E.M.E.L.-Report, Saint Valery sur Somme, 45 pp.

Baas, J.H., Lafite, R., Laignel, B. and Claudel, O. 1997
Exploration of Gravel in the Paleovalley of the River Somme. G.E.M.E.L.-Report, Saint Valery sur Somme, 11 pp.

Baas, J.H., Pool, M. and Usai, E. 1993
Informe sobre la Mision de Expertos de la Comunidad Económica Europea a la Cuenca del Río Pilcomayo, Paraguay-Argentina. Scientific Report for European Community, Brussels (in Spanish).

Baas, J.H. 1991
Fysische Sedimentologie. Deel 1: Regelmatige Oppervlaktestroming. Lecture notes of seminar on "Hydrodynamics and Sediment Transport", Utrecht, 1991. 64 pp (in Dutch).

Baas, J.H. 1991
Fysische Sedimentologie. Deel 2: Sediment Transport in Unidirectionele Oppervlaktestroming. Lecture notes of seminar on "Hydrodynamics and Sediment Transport", Utrecht, 1991. 98 pp (in Dutch).

Baas, J.H. 1988
Preliminary Results of Flume Experiments with Löss: Sept. 1988. Scientific Report, Institute of Earth Sciences, Utrecht University. 29 pp.

Baas, J.H. 1988
Shelf en Slope Afzettingen ten Zuiden van de Peña Montanesa, Centraal Zuidelijke Pyreneën, Spanje. M.Sc. Thesis, Utrecht University. 80 pp (in Dutch).

PDF copies of some of these publications are available (as indicated by hyperlinks in the list) for non-commercial research and educational purposes only. You may not use the material for commercial purposes or make multiple copies without requesting permission from the copyright holder (usually the book or journal publisher).

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