NCK Themeday Water Bed Exchange june 22, 2006.
WL|Delft Hydraulics, Rotterdamseweg 185, Delft.
June 22nd the fourth NCK themeday was held at WL|Delft Hydraulics concerning 'water-bed exchange of cohesive sand-mud mixtures'. A report of the workshop was published in the journal called GeoTechniek (available here). Proceedings of the workshop can be downloaded (here). The workshop was subdivided into two days. The programme for both days can be downloaded (here). The first day was organised around presentations by various speakers; as indicated below. The second day was mainly devoted to the preparation of a number of scientific papers to be written in collaboration.
Session 1: Physical background of sand-mud mixtures
Granular’s and Mud’s Rheology applied to sedimentation and consolidation. Damien Pham Van Bang, CETMEF, France
The influence of organic matter on the properties of mud. Gerard Kruse, GeoDelft, the Netherlands
Density and strength of sediment mixtures as function of sand content and clay mineralogy. Walter Jacobs, TU Delft, the Netherlands
Session 2: Influence of biology on the stability of sediment beds
Changing sediment properties with the (dis)appearance of a benthic community in the Westerschelde Estuary, SW Netherlands. Francesc Montserrat, NIOO, the Netherlands
Impact of intertidal biota on near-bed hydrodynamics and sediment erodability. John Widdows, Plymouth Marine Laboratory, England
Ecosystem engineering in benthic boundary layers: thresholds and trade-offs. Tjeerd Bouma, NIOO, the Netherlands
Session 3: Bed forms and erosion of cohesive sand-mud mixtures
Bed forms in partly cohesive sand-clay mixtures. Robert Basaniak, Ghent University, Belgium
Towards a continuous erosion law for sand/mud mixtures, using erodability measurements. Pierre le Hir, Ifremer, France
An experimental model for turbulence modulation in natural clay–laden flows over flat beds, ripples and dunes. Jaco Baas, University of Leeds, England
Strength, Permeability and Erodibility of Sediment Mixtures. Walther van Kesteren, WL|DelftHydraulics, The Netherlands
Session 4: Measuring techniques related to sediment bed characteristics
In situ measurements of silt content and density. Ronald Koomans, Medusa explorations, the Netherlands
Mapping and monitoring intertidal sediment bed characteristics using satellite remote sensing. Daphne van der Wal, NIOO, the Netherlands
Unsupervised classification techniques for surface sediment type discrimination using hyperspectral airborne imagery. Stefanie Adam, KU Leuven, Belgium
Session 5: Modelling erosion of sand-mud mixtures and implementing biological effects
Interaction of physical and biological processes in a microtidal estuary: an idealized model approach (analytical). Henk Schuttelaars, TU Delft, the Netherlands
Sand and mud in a one-dimensional model for the lower Rhine and Meuse rivers. Jasper Hugtenburg, Ministry of transport, public works and water management, the Netherlands
Numerical modelling of sand transport rates and resulting bed evolution using the Telemac hydro-informatic system. Catherine Villaret, EDF-LNHE, France
Development of a sand-mud model in the framework of land reclamation Maasvlakte 2. Mathijs van Ledden, Royal Haskoning, the Netherlands
All in all the workshop was considered to be very succesful and the starting point for a number of interesting research topics. Further information may be obtained from Walther Jacobs (email:
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).
Theme Days 
