Graduate Thesis Or Dissertation
 

Laboratory observations of tsunami runup on a complex 3D bathymetry using PIV

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6108vd50c

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  • This thesis presents the details of a large-scale laboratory experiment to study the runup velocity on a complex 3D bathymetry. The PIV measurements including the instrumental setup, the recording procedure, and the image processing are presented. Tsunami inundation directly affects the coastal population and is one of the most important tsunami processes to be understood because most of the deaths occurred during inundation. Therefore, it is vital that we understand the dominant mechanisms during tsunami inundation to predict the inundation level and inundation velocity to help reduce loss of life and damage in future events. Numerical simulations have been used to predict the maximum tsunami inundation level and run-up velocity. However, field data that can be used to validate the numerical models is limited. Laboratory measurements can be used to verify or refuse the present models. A 3D complex physical model was constructed in the Tsunami Wave Basin at the O.H. Hinsdale Wave Research Laboratory at Oregon State University. The objective of the experiment was to measure both the tsunami velocity at offshore locations and the run-up velocities on the bathymetry. Since real world tsunami inundation may occur with or without wave breaking, and inundation with wave breaking, laboratory wave conditions were also chosen to have both types. Wave gages and ADVs (acoustic Doppler velocimeters) were used to measure the offshore wave height and wave speed, respectively, and PIV (particle image velocimetry) was used to measure the shallow water and run-up wave velocities on land where it could not be measured by the ADV. The data acquired in this experiment were placed online as a part of the shared-use concept of the NEES (National Science Foundation's Network for Earthquake Engineering Simulation).
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