Environmental Geology lecture outline
- Shorelines and related environmental concerns.
A case history: Galveston, Texas, on Sept.
8th 1900 and now.
of Galveston, with breakwaters, seawall and buildings built on
on 1900 storm:
20 foot high storm surge covered island.
4' increase in less than a minute in some
3000 homes demolished.
built up platform to reconstruct on.
'protected' by a seawall
View of Hotel Galvez from breakwater made of
granite blocks. The thin beach and the seawall are also evident.
are general environmental concerns associated with shorelines?
basic forces are involved in shaping shorelines?
Myriad of shoreline types - will look at
three general types.
- barrier island complexes.
- three end member types: river, wave, tide
- the Mississippi delta, lobe
progradation -> lobe switching, and the Atchafalaya pirate.
- compaction, subsidence,
flooding, mass wasting, shifting channels and ecosystems
- flooding on the Bangla Desh delta: in
last 30 years typhoons have caused over 300,000 fatalities.
Barrier Island complexes
and shifting shorelines:
- California and mass wasting triggered
by slope profile steepening.
are engineering responses to shifting shorelines?
What is an alternate approach to shifting
and flooded shorelines?
Some links to explore more:
USGS study of El Niño Coastal Erosion along California.
of Texas Coastal Erosion Planning and Response.
on risk analysis and management for coastal erosion and catastrophic
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