engineering geology where civilization and earth meet soil and rock as engineering materials...
TRANSCRIPT
Engineering GeologyEngineering Geology
Where Civilization and Earth Meet
Soil and rock as engineering materialsResource extraction and usage
Environmental impactsGeologic Hazards
Dr. James M. Martin-HaydenAssociate Professor
(419) [email protected]
Dr. James M. Martin-HaydenAssociate Professor
(419) [email protected]
World Population Growth11.9
9.8
7.9
High Growth Medium Growth Low Growth
Population Growth
% per year1%
2%
Expon
entia
l Gro
wth
Actual Growth
Kehew, Figure 1.4 and 1.5
Population in Crisis
Pandemics and food shortages are beginning to decrease population growth
Contamination and global warming will only exacerbate the problem
Overuse of Geologic Resources
1.7 billion are joining the “consumer class” and the environment can’t sustain this standard of living. (Worldwatch Institute, 2004)
Emissions of Greenhouse gasses is accelerating global warming
Climate change is accelerating melting of glaciers and driving mass extinctions (The Centre of Biodiversity and Conservation, Leeds University, UK)
(Geology in the News)
Global Oil Production to Peak
Once oil production peaks extraction will become increasingly expensive.
Alternative sources Coal (emissions?) Nuclear (waste?) Renewable (lagging
technology?)
See Kehew Fig. 1.8
Greenhouse Gasses and Global Warming
Global Warming lags CO2 spikes
CO2 concentration is higher than all maximums during the past 500,000 years
And still increasing!
See Kehew Fig. 1.14
Effects on Engineering Geology
Melting of Polar ice Opening of new arctic shipping routes in a
few decades Melting Permafrost Increasingly severe storms Sea level rise (~6m in a few decades)
Increased erosion Flooding Submerged infrastructure
Water ResourcesUse of fresh water from the water cycle
Surface water Lakes Streams
Groundwater Springs Aquifers
(extracted by pumping wells)
Water Cycle Storage and TransferStorage In 106 km3
Transfer in 106 km3/yr
Fresh Water Withdrawal Trends
Fresh Water Withdrawal Trends
The Cradle of Civilization Sprung from geology of the region
Tigris River, Iraq
http://encarta.msn.com/
World of Geology
The Cradle of Civilization (Fertile Crescent)
Development limited by availability, e.g., soil, water, energy
Conflicts based on resources, e.g., water, minerals, oil, energy… http://encarta.msn.com/
Geological Resources
Geologic Resources Mineral Resources:
metals, fertilizers, minerals, petroleum, construction
Geologic Resources Mineral Resources:
metals, fertilizers, minerals, petroleum, construction
Water resources: Lakes, Rivers, Springs, Groundwater
Geologic Resources Mineral Resources:
e.g., Metals, fertilizers, minerals, petroleum, construction
Water resources: e.g., Lakes, Rivers, Springs, Groundwater
Energy: e.g., Oil, natural gas, coal,
nuclear, silicon, hydroelectric (dams), hydrothermal (Earth’s heat)
The Geologist’s Job Locating and
Characterizing quantity and quality of geologic resources
Extracting geologic resources efficiently
Assessing environmental effects of extraction and use
Geologic Resources
E.g., Misuse of Resources
Misuse of ResourcesDesiccation of the Aral Sea, Kazakhstan
www.grida.no/aral/aralsea/english/arsea/arsea.htm
1980
See Page 6
2000
2005
Aral Sea Over Time
195719771982198419932000
Environmental Geology Environmental Sciences:
How we influence the earth
Geologic Hazards: How geology influences us
Geology in the News
Two die in 6.5 magnitude Earthquake near San Lois Obispo California
Earthquake triggers mudslides
http://news.nationalgeographic.com/news/2003
Geologic Hazards
San Andreas Fault
Assessing Risk“Major Quake Likely to
Strike San Francisco Bay Region Between 2003 and 2032”
• Assessing Risks• Avoiding Risks• Preventing Damage• Predicting Impact
Geologic Hazards
(http://quake.wr.usgs.gov/research/seismology/wg02/
Earthquake Bam, Iran
A Magnitude 6.5 Earthquake hits a stone- and mud-house city of 100,000 in Iran 12-26-03 30,000 Dead 30,000 Refugees
US sends aid and releases sanctions
Relations improved
Photos from AP
Geological HazardsVolcanoes (pg. 108)
Landslides (see pg. 250)
Earthquakes (pg. 202)
Floods (see pgs., 284)
Geology in EngineeringSlope Failure Risk Assessment and Control
To prevent slope failure engineers must understand the geology that forms and controls the slope
Geology in Engineering
Geology in Engineering
Committee member John Burland, an engineer, promoted soil extraction as the best way to save the tower.
In Pisa the tilted one is back in business after an 11-year effort to keep it from collapsing
The Leaning Tower Straightens Up
www.smithsonianmag.si.edu
Engineers use knowledge of geology to design, protect and correct structures