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Hydrodynamics of Local Tsunami Effects - Numerical and Scale Model Results Based on Laboratory Experiments at the University of Washington and Numerical Simulation at Southern Methodist University (National Science Foundation Grant CMS-9614120) 1957 Aleutian Tsunami Laie Point,

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slide1
Hydrodynamics of Local Tsunami Effects - Numerical and Scale Model Results

Based on Laboratory Experiments at the University of Washington and Numerical Simulation at Southern Methodist University

(National Science Foundation Grant CMS-9614120)

slide2
1957 Aleutian

Tsunami

Laie Point,

Oahu, Hawaii

Photo Credit:

Henry Helbush.

Source: NGDC

slide3
Photos of incoming tsunami at La Manzanillo, Mexico on October 9, 1995 (Mw = 8.0)

Courtesy of J. Borrerro, USC

slide4
Ishikawa River on Hokkaido Island

Pedestrians on seawall

1983 Sea of Japan Tsunami, (Video footage courtesy of NHK)

slide5
Hilo Harbor

Puumaile Tuberculosis Hospital

1946 Aleutian tsunami in Hilo, Hawaii. 96 people died, $26 million damage.

(Photos courtesy of NGDC)

Kamehameha Ave., Hilo

slide6
Isla Chiloe, Chile

about 200 mortalities

Hilo, Hawaii

61 mortalities

1960, Chilean tsunami (Mw = 8.6)

(photos courtesy of NGDC)

slide7
Pancer, East Java. The tsunami of June 3, 1994

took the lives of 126 people and destroyed 671 structures.

slide9
Views of Laboratory Instruments

Pneumatic Gate

Cylindrical Obstacle

Force Cell in Cylinder

slide12
Obstacle

Gate

Water

Walls

Side

View

30

40

50

12

58

24

Top

View

12

25

Schematic of Experiment (all dimensions in cm)

slide13
15

16

18

17

Laser Light Sheet Images of Water Surface: Frames 15-18

slide14
20

19

21

22

Laser Light Sheet Images of Water Surface: Frames 19-22

slide15
Surface Profile Acquisition:

Raw Data from Frame 19

slide16
Surface Profile Acquisition:

Processed Data from Frame 19

slide22
Comparison: Lab Force Data with Three-Dimensional Surface Marker and Micro Cell (3DSMMC) Technique

Force (N)

Time (s)

slide25
Comparison: Lab Velocity Data with Three-Dimensional Surface Marker and Micro Cell (3DSMMC) Technique

1

Horizontal Velocity (m/s)

0

Time (s)

slide26

Linear Momentum: F = mvx = (Avx)vx

Drag Force: F = 1/2CDAvx2, CD = 2

slide27
Some Conclusions:

1. Laboratory and numerical results confirm that the maximum force occurs when the area behind the bore head begins to impact the obstacle.

2. The 3DSMMC horizontal forces on the square obstacle and of the velocity field model gives an accurate prediction of the around the obstacle during the progression of the bore.

3. For the square obstacle facing into the flow, using the measured maximum velocity in the bore and either conservation of linear momentum or a drag force calculation yields a good first order estimate of the maximum force.

hydrodynamics of local tsunami effects numerical and scale model results

Hydrodynamics of Local Tsunami Effects - Numerical and Scale Model Results

H. Yeh, C. Petroff and H. Arnason

Department of Civil & Environmental EngineeringUniversity of Washington, USA

R. Bidoae and P. Raad

Department of Mechanical Engineering

Southern Methodist University, USA

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