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Multi-directional Wave and Current Basin

Multi-directional Wave and Current Basin
LUH (Franzius-Institute, FI)
Nils Kerpen

Franzius-Institute for Waterways, Estuarine and Coastal Engineering
Nienburger Str. 4
D - 30167 Hannover
Germany
http://
www.fi.uni-hannover.de/kerpen

Multidirectional sea states with a max. wave height of 0.47 m can be produced in the 3D wave basin (dimensions: 40 m x 24 m) for water depth up to 1 m.

Description of facility:

Technical data

Wave and Current Basin Marienwerder (WBM)
length : 15 m (20 m without removable wave absorber)
width : 30 m (40 m without removable wave absorber)
depth of basin : 1.5 m
water depth : 0.2 - 1 m
depth of deeper sections : additional 1.2 m
Wave generator
piston-type (translatory) wave boards with 1.2 m stroke
number of segments: 72 (0.4m width)
length of wavemaker: 28.8
active re-reflection compensation
First and second oder wave steering system
Wave characteristics
maximum regular wave height Hmax = 0.45 m
maximum significant wave height Hm0 = 0.25 m
wave period range: T = 0.8 – 5 s
wave directions between -55 and 55 degrees
Features
lateral current (Q = 5m3/s, v = 0.3 m/s with water depth of 1m, v_max = 0.8 m/s)
sand pit (9x7m, 1.2m deep with surrounding sand trap)

 

This facility is a multidirectional wave and current basin (WB) with 2nd order wave generation and active wave absorption. The overall wave basin dimensions are 30 m in width and 15 m in length. It is equipped with a state-of-the-art multidirectional wave maker – consisting of 72 piston wave paddles (each 0.4 m wide and 1.8 m high) – and used to generate 1st and 2nd order regular waves and nature-like long and short crested wave spectra on a total length of 28.8 m. The wave maker can operate with a maximum stroke of 1.2 m and a maximum paddle velocity of 3.0 m/s. A high-class multilayer mesh screen absorber acts as a passive wave absorber East, West and South in the basin. By high-precision real-time analysis of the distinct surface elevation at each wave paddle the active absorption control enables properly experiments over long time frames including the following boundary conditions and features covering a wide range of needs:

  • Directional waves with variable wave angles up to ±55° to the perpendicular line of the wave maker
  • Maximum significant wave height: Hs = 0.25 m
  • Up to 1.0 m water depth
  • Active absorption of re-reflected signals up to 6 Hz
  • Current generation (5.0 m3/s) parallel to the wave maker up to 0.3 m/s for 1m water depth over the entire basin width
  • Extra large sand pit 7.0 x 5.0 x 1.2 m (LxWxD) in the center of the basin with circumferential sand trap on demand
Multi-directional Wave and Current Basin Multi-directional Wave and Current Basin

 

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