
NICHE

Specifications
The NICHE Design continues to evolve, informed by experimental from the Physical Design Testbed, CFD Results, and input from the community and various advisory/review bodies.
​LAST UPDATE: MAY 2025
1
Water, Wave & Flume Specifications
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Building for wave generation and pumping facilities
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Freshwater
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Flume Cross Section: 18m W x 15m H (59' W x 49' H)
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Flume Length: 560m (1837’)
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Flume Sections: Wave generator, Wave generation section,
Coastal slope, Coastal plain, Wave absorber
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Wave Generation: piston-type paddles, unidirectional
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Maximum Water Depth: 10m
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Maximum Wave Height: 5m (16’) with Max Period of 14 s
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Design Surge: 4m
2
Synoptic Wind Specifications
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Separate building for wind generation, staging, viewing
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Wind Cross Section: 18m W x 16m H (59’ W x 52.5’ H)
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Wind Speed: ~185 MPH (uniform), ~205 MPH (typ. BL profile)
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Fetch Length: 130.4 m
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Fans: 20x 16' fans – 4000 HP each
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Open and Closed Circuit modes​​​​
3
Open Circuit Mode
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Max speed: ~155 MPH (uniform); ~174 MPH (typ BL profile)
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​Use Case: destructive testing
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Limitations: Less efficient, environmental exposure
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4
Closed Circuit Mode
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Max speed: ~185 MPH (uniform); ~207 MPH (typ BL profile)
Use Case: Higher speed, controlled testing -
Limitations: Non-destructive testing only​
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5
Non-Stationary Flow Control System
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Motorized Louver System arranged into modular “cabinets”
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Each louver is individually controllable, can spin full 360 deg
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Max speed ~5 rad / sec (286 deg / sec)
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Key parameters:
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Vertical Acceleration: 0-30 m/s2
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Pressure Change: 1-100 mb
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Direction Change over Time: 0.05-5 rad/s
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Direction Change over Radius: 0.007-0.09 rad/m
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Translation Speed: 0-30 m/s
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Radial Gradient in Velocity: 0.6-6.5 s-1
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Installed in flow management section
6
Variable Bathymetric Profile
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Solid Bottom for Hydrodynamic-Only Studies
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Fixed concrete platform with adjustable elevation
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Offshore slopes can be altered by rearranging slabs
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Morphodynamic Studies
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Uses subset of concrete slabs and/or sediment
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Reproduce Atlantic & Gulf Coast beaches
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7
Other Key Features
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Sediment Pit for testing foundations and pile systems
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​Separate pump systems for:
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filling/draining/recirculation
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currents
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