Delta Basin

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.

Typical studies

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