Delta Basin

The Delta Basin (50 x 50 m) is a multidirectional wave basin with segmented wave paddles that can create waves in multiple directions. The wave generator is capable of generating both regular (periodic) as irreguler (random) long-crested or short-crested waves according to both well-known frequency-directional distributions. The wave generator is equipped with online Active Reflection Compensation, which effectively eliminates re-reflections of waves from the wave board.

Also wave board control for random second-order waves is operational to compensate for spurious waves. The active wave absorption system accounts for 3D effects and short-waves effects. This means that the direction of the reflected waves propagating towards the wave board is accounted for and that the reflected waves propagating towards the wave board are absorbed accounting for short-waves effects and not only for long-waves effects. Also, the Dalrymple Method is available, which enables generation of wave trains at a specified location, which effectively increases the model area that can be used.

Application areas
The influence of 3D wave attack on structures can be substantial. To study phenomena related to such conditions the Delta Basin is very suitable, because of its large dimensions. Both waves, current and a combination of these can be generated.
The Delta Basin is used for coastal and offshore related projects. In all of these studies, aspects of armour stability, hydraulic performance, wave impact loading and the determination of the relevant hydraulic conditions for design purposes were of primary interest.

Projects
Typical studies for the Delta Basin are related to:

  • Breakwaters; 3D stability, breakwater roundhead
  • Jetties; wave pressures and wave forces on piles and decks of Jetties
  • Revetments
  • Wave climate studies
  • Wave agitation into harbours
  • Moored ship studies
  • Scour and mobile bed studies
  • Dune erosion and coastal beach protection schemes

Technical specifications:

  • Wave basin
    Horizontal dimensions: 50 x 50 m
    Maximum water depth: 1.0 m­
  • Wave generator
    Segmented piston-type wave boards
    Number of segments: 100
    Length of wavemaker: 40 m
    Stroke: 1.2 m
    Equipped with 3D Active Reflection Compensation
  • Wave characteristics
    Wave directions: between -50 and 50 degrees
    Maximum regular wave height Hmax,r: 0.45 m
    Maximum focussed wave height Hmax,f: 0.6 m
    Maximum significant wave height Hm0: 0.25 m
  • Features
    Lateral current