Download presentation

Presentation is loading. Please wait.

Published byEsperanza Finnell Modified over 2 years ago

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

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

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
u

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/s 2 – Accurate reproduction of oscillations with reference accelerometer Large-scale wave tank tests – Height=0.20m, Period=3s – Incipient motion at Shields of and Sleath of 0.12 – Results indicated plug flow sediment transport regime

13

14

15
X-Force Balance yields:where: Incipient Motion bb T p > ~ 0.37 Sleath (1999) > 0.04~0.08 incipient motion > 0.8sheet flow S > 0.29 plug flow

16
X-Force Balance yields:where: Incipient Motion bb T p > ~ ? Sleath (1999) > 0.04~0.08 incipient motion > 0.8sheet flow S > 0.1 plug flow

17

18

19

20
Thank you Boundary Layer observations over fixed beds Particle accelerations of incipient motion and rolling grains

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google