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Tsunami Induced Turbulent Coherent Structures

Tsunami Induced TCS. Near-surface breaking TCS. Nearbed TCS. Shallow horizontal TCS. Diane Foster (UNH), Pat Lynett (USC), and Tom Hsu ( Udel ) Sponsor: NSF CMMI - 1135026. Scour. Harbors and Ports. Tsunami Induced Turbulent Coherent Structures. Pick up and Liquefaction. z. x.

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Tsunami Induced Turbulent Coherent Structures

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  1. Tsunami Induced TCS • Near-surface breaking TCS • Nearbed TCS • Shallow horizontal TCS Diane Foster (UNH), Pat Lynett (USC), and Tom Hsu (Udel) Sponsor: NSF CMMI - 1135026 • Scour • Harbors and Ports Tsunami Induced Turbulent Coherent Structures • Pick up and Liquefaction z x y

  2. Nearbed TCS With significant intellectual contributions from Donya Frank and Meagan Wengrove • Scour Tsunami Induced Turbulent Coherent Structures • Pick up and Liquefaction z x y

  3. Observations • NEESR • Large Wave Flume • O. H. Hinsdale Wave Research Lab • Wave Conditions • Long Waves • Short Waves & Long Waves • Short Waves

  4. Observations • BL measurements • u, v, w • 1 mm range bins over 3 cm • 100 Hz • Bed Roughnesses • Flat • Rippled • Rough

  5. Observations • BL meaurements • u, v, w • 1 mm range bins • 100 Hz • Bed Roughnesses • Flat • Rippled • Rough

  6. Single solitary over a flat smooth bed u (m/s) w (m/s)

  7. Single solitary over a flat smooth bed u (m/s) w (m/s)

  8. Reynolds Stress Estimate u

  9. Reynolds Stress Estimate u t

  10. Rough Bed • Flat • Rippled • Rough

  11. Smart Sediment Grains • Dimensions: • 2.5 x 1.5 x 1.4 cm • Components: • 2 triaxial accelerometers, memory card, battery and wireless transmitter. • Enclosure: • 4.4 cm Delrin plastic sphere • Combined specific gravity of 1.3

  12. Overview of Test Results • Preliminary tests • Low noise floor: 0.3 m/s2 • Accurate reproduction of oscillations with reference accelerometer • Large-scale wave tank tests • Height=0.20m, Period=3s • Incipient motion at Shields of 0.025 and Sleath of 0.12 • Results indicated plug flow sediment transport regime

  13. X-Force Balance yields: where: Incipient Motion Sleath (1999) b p T  > 0.04~0.08 incipient motion  > 0.8 sheet flow > ~ 0.37 S > 0.29 plug flow

  14. X-Force Balance yields: where: Incipient Motion Sleath (1999) b p T  > 0.04~0.08 incipient motion  > 0.8 sheet flow > ~? S > 0.1 plug flow

  15. Thank you • Boundary Layer observations over fixed beds • Particle accelerations of incipient motion and rolling grains

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