Monday, March 4
Relevance of Geology
to Modern Environmental Issues
Instructor: Elizabeth (Liz) Champeon
Thursdays • 8 classes • 3/21-5/9 • 1:00-3:00 PM
Class size 5-100 students
100 seats remaining
Location: Zoom only
This course addresses the importance of site geology to modern environmental issues and installations. The course commences with a general review of the geology of Maine and the reason we need to know this in siting of modern facilities that will address the changing climate. Subsequent lectures include a definition of aquifers, with a discussion of recharge of groundwater; a presentation on the potential and existing use of geothermal (ground source) heat in regions of cold rock; a segment on local and worldwide earthquakes; the use of solar power and advances in the science; water as a source of power; wind and wind farms; and finally a presentation on the history of glaciers in Maine and other areas.
Sessions by week —
A BRIEF HISTORY OF MAINE
or Why is my Yard Full of Rocks or Clay?
This session provides a brief summary of the forces that produced the geology and geography of the State of Maine, commencing with the continent of Pangea and proceeding to the glaciation and the effects that it had on the landscape. The purpose is to provide a background for the remaining sessions, which deal with the relevance of the subsurface to the development of new sources of clean power.
Aquifers are important for the maintenance of agriculture, as sources of water for households and for drinking, and for industrial uses. Aquifers are characterized by the material in which they are sited. The utility of an aquifer is dependent
upon the ease with which water can be extracted and the rate at which that water can be replenished by precipitation. Extraction and replenishment rates are directly dependent upon the matrix of the aquifer. The processes by which aquifers can be used as resources in a sustainable manner are discussed.
IN COLD REGIONS
Geothermal heat is available throughout the crust of the earth, both due to infiltration of heat from the sun and exfiltration of heat from the interior of the earth. In cold regions like Maine, this heat can be accessed from the subsurface. The type of material in the subsurface affects both the transfer of heat and the amount available. Several schools in Maine have now installed these systems, and no longer are dependent upon fossil fuels.
Siting of buildings, landfills, power plants, dams, dikes and other facilities requires knowledge of the earthquake history of the surrounding area. Not only is it necessary to know what the seismic history of a site is, but regulations require that the anticipated seismicity be predicted. Unfortunately, in this part of the world, the oral history of those who have lived here the longest has been ignored or destroyed, so other means of rational prediction must be found.
This session examines the potential for solar power in various regions and explains how the power is generated from the solar panels that are sprouting in the countryside. Reference is made to ancient uses by other civilizations.
THE POWER OF WATER
Water has been used to create power since at least 3000 BCE, when the Jawa Dam was constructed in Mesopotamia. Water power use exploded in the industrial age. Even when rivers and streams were not available, the power of the tides was tapped in places like Martha’s Vineyard. The remains of a tidal dam can still be seen in Jonesboro, Maine. The Quoddy project in Eastport was intended to provide power during the Roosevelt administration, but the project was terminated by World War II. New technologies are now being proposed that would use the power of the tides.
Schoolhouse geography teaches that the Dutch use windmills to control the water in their below sea level homeland. In recent years, windmills have come to be used to create power worldwide. The mechanism of making power from windmills is discussed, as is the relevance of the local geology to the siting of the windmills.
Liz Champeon is a retired geologist registered to practice in the State of Maine. She spent the majority of her working years in private practice at S. W. Cole Engineering, Inc. where she was a Senior Geologist and a member of the Board of Directors. Her more than 30 years of experience also include work for both Federal and State agencies, and she has served as adjunct faculty at Unity College. She has a BA in Geology from the University of Maine and took graduate courses at the University of Indiana and University of Maine. She has loved geology since studying dinosaurs in the fourth grade.