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More Tsunami Basics

More Tsunami Basics. Phases of a Tsunami Event: Generation Propagation Shoaling Inundation. Shoaling. Wave steepens and breaks because of decreasing depth:. Forces on a structure: Hydrostatic (pressure) force Buoyant Force Hydrodynamic Force. Forces on a structure:

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More Tsunami Basics

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  1. More Tsunami Basics Page 1

  2. Phases of a Tsunami Event: • Generation • Propagation • Shoaling • Inundation Page 2

  3. Shoaling • Wave steepens and breaks because of decreasing depth: Page 3

  4. Forces on a structure: Hydrostatic (pressure) force Buoyant Force Hydrodynamic Force Page 4

  5. Forces on a structure: Hydrostatic (pressure) force Buoyant Force Hydrodynamic Force Surge Force Impact Force Breaking Wave Force Page 5

  6. Here is an example of a broken wave (or bore) hitting a square column in a laboratory: Page 6

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  9. Hydrodynamic forces on a structure on a structure: Here is what the lateral force looks like on the square column during impact Page 9

  10. For the modelers in the audience, here is the same thing on a computer: Page 10

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  12. Let’s do a brief exercise: • Light wood construction • 2x4 studs, light plaster both sides 19psf • Floor wood 4 psf • Roof wood 3 psf • 5 meters square • 1 psf = 48 Newtons/m2 • Velocity? Asafa Powell 100 meters in 9.77s, 2006 Zurich http://nctr.pmel.noaa.gov/education/science/docs/floatorfall.xls Page 12

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