[Announce] NHERI SimCenter 8/30 Webinar Announcement

[announce at designsafe-ci.org]

*NHERI SimCenter*–
* Natural Hazards Engineering 101 Wednesday, August 30, 2017, 11am – 12pm
PDT*

*Understanding Tsunamis and Their Effects*


*REGISTER* for this webinar at
https://www.designsafe-ci.org/learning-center/training/simcenter/webinar-170830/

Connection information will be distributed upon receipt of registration.



*ABSTRACT:*

Tsunamis are translational long waves created by the seafloor displacement.
Here we focus on tsunamis triggered by co-seismic fault rupture.
Geophysical time-and-space scales relevant to tsunami phenomenon are
discussed, emphasizing its unique natural hazard phenomenon.
Characteristics of tsunami generation, propagation, and inundation are also
presented.

Then, lessons learned from the 2011 Heisei Tsunami are presented. This 2011
event has altered our traditional concepts on tsunami hazards. Prior to
this event, it was understood that reinforced concrete structures could
withstand tsunami actions. This concept is no longer the case. Many
concrete buildings and coastal protective structures (seawalls and coastal
dykes) failed by rotation. Several failure patterns of seawalls and coastal
dykes are examined. Flow-induced suction pressures on the crown must play a
role in the failure of concrete panels that had covered dyke’s infill.
High-speed flows together with high compressing pressures caused the
formation of scour at the leeside foot of the dyke. Then, we examine a
couple of reinforced concrete buildings that were exposed to similar
tsunami loadings, but one was toppled and the other survived. The presence
of soil foundation causes a time delay and attenuation of the buoyancy
effect on the buildings. The buildings are also stabilized by the weight of
water that has flooded the inside. A few directions are discussed for the
development of design considerations for buildings and coastal structures
to cope with the “beyond-the-design-basis” extreme coastal hazards. At the
conclusion, some conceptual strategies to approach such complex problems of
extreme natural hazards are presented.

*PRESENTER:*
* Harry Yeh* is a Professor in Civil Engineering at Oregon State
University. He received an AB in Economics from Keio Gijuku University
(Japan), BS and MS degrees in Agricultural Engineering from Washington
State University, and a PhD in Civil Engineering from University of
California. He worked for Bechtel Inc. in the late 1970s and early 1980s,
primarily analyzing hydrodynamics problems involved in electric power
plants. Professor Yeh began his academic career in 1983 at the University
of Washington, then joined the faculty of School of Civil and Construction
Engineering at Oregon State University in 2003. His primary research
interest is in the field of hydrodynamics of tsunamis, focusing on
controlled laboratory experiments and theoretical development of nonlinear
long-wave theory. Professor Yeh participated in several reconnaissance
field surveys for tsunamis – from the 1992 Nicaraguan event to most recent
Japanese Tsunami in 2011.


*About Natural Hazards Engineering 101:*

NHE 101 is a webinar series intended to provide a common knowledge base for
the NHERI community. Webinars will, for each of the primary natural hazards
in the NHERI program, provide an introduction to fundamental concepts and
an overview of experimental- and simulation-based research. Webinars will
also provide an introduction to numerical methods and computational tools
used in NHE research. All are encouraged to participate.
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