Xbloc - Effective ware protection for breakwaters and shores

Xbloc for Scientists

Developing the Xbloc in the past led to extensive research within DMC on single layer armour unit behaviour under different circumstances and with different design concepts. Research has also generated new design options as Eco Xbloc and Xbase. 

Since July 2008 DMC also executes research in its own 2D wave flume.

Other institutes which have been performing model tests on Xbloc are:

  • Deltares, Delft, The Netherlands
  • TU Delft, The Netherlands,
  • DHI, Denmark
  • University of Edingburgh, Scotland
  • CSIR, Stellenbosch, South Africa
  • Queens University, Belfast, Northern Ireland
  • Water Research Laboratory University of New South Wales, Sydney, Australia
  • Aalborg University, Denmark.
  • Manly Hydraulics, Sydney, Australia
  • HR Wallingford, United Kingdom
  • Indian Institute of Technology, Madras, Chennai, (ITT Madras) India
  • Lanka Hydraulic Institute, Colombo, Sri Lanka

Research topics and interesting links

Hydraulic Stability

  • Stability of armour units on slope
    Hydraulic Performance of Xbloc Armour Units
  • Overtopping
    CLASH test
    results: Overtopping performance of different armour units for rubble mound breakwaters
  • Wave reflection
    Wave reflection from coastal structures by B. Zanuttigh and J.W. van der Meer

Structural Integrity

  • Analysing the robustness of the Xbloc

    Structural Integrity of the Xbloc breakwater armour units prototype and numerical droptests

    Placement and structural strength of Xbloc and other single layer armour units

Toe Stability

  • Model tests of Xbase Toe solution
    Xbase development and application of a special concrete toe unit for extreme conditions

Placement Research

  • Research on constructability and theoretical placement grid
  • Logistic studies of the fabrication, storage and placement of units.


Ecological Research

  • Monitoring growth of vegetation at IJmuiden on Eco Xbloc