Transcript Hurricane Ivan Ppt - Texas A&M University

Collapsed five-story building,
Romar Beach, AL:
The lower two floors of the fivestory building in the center of
these photos have collapsed and
the third floor has fallen to ground
level. Erosion in front of the
buildings undermined pools and
walkways, and perhaps the
buildings themselves (although
the failure mode must await
analysis by structural engineers.)
Note the sandy overwash
deposits that were driven
landward between the buildings
by storm waves and currents.
Collapsed front of multistory building,
Orange Beach, AL:
This five-story building was perched on
top of a dune that was eroded during
Hurricane Ivan. The Gulf-front portion of
the building collapsed. Compare the
pilings in the pre and post-photos of the
house adjacent to the multi-story
structure to determine the scale of
vertical erosion of the dune. In the poststorm photo, the lower, unpainted
portions of the pilings were below sand
level prior to Hurricane Ivan.
Destroyed houses on top of a
dune, Orange Beach, AL:
These houses were on built top of
a dune that was severely eroded
during Ivan. Note the walkways in
the pre-storm photo that once
served as pathways down to the
beach.
Breach through barrier island, Pine
Beach, AL:
The island was severed by a breach
that may have developed as the back
bay drained excess water following the
peak of the storm surge, although the
breach could have been initiated by
waves and surge from the Gulf side.
More analyses are required to
determine the forcing processes.
Villa Sabine, FL:
This area of two-story
townhouses west of
Pensacola Beach was clearly
overwashed by the storm
surge generated by
Hurricane Ivan. The
overwash sediments reached
the back bay on the left-hand
side of the photo and likely
would have reached it in the
center of the photo, if they
had not been blocked by the
townhouses. Notice how the
Gulf-front beach is relatively
clear of debris, which has
been deposited on the spit of
land behind Little Sabine
Bay.