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(1 - 4 of 4)
- Title
- Comparison of sand dune chronologies in the Great Plains and eastern Lake Michigan coastal zone
- Creator
- Kowalski, Daniel Michael
- Date
- 2014
- Collection
- Electronic Theses & Dissertations
- Description
-
Extensive deposits of eolian sand occur throughout the Great Plains region as well as along the eastern coastal zone of Lake Michigan. Numerous studies have been conducted on dunes in the Great Plains and along the Lake Michigan coast. Recent research suggests that dunes in both regions were active contemporaneously during the Medieval Warm Period (MWP). This finding is interesting because it suggests that broad regional climate patterns may have influenced dunes in both systems. Given the...
Show moreExtensive deposits of eolian sand occur throughout the Great Plains region as well as along the eastern coastal zone of Lake Michigan. Numerous studies have been conducted on dunes in the Great Plains and along the Lake Michigan coast. Recent research suggests that dunes in both regions were active contemporaneously during the Medieval Warm Period (MWP). This finding is interesting because it suggests that broad regional climate patterns may have influenced dunes in both systems. Given the apparent synchroneity in dune systems within the Great Plains and Great Lakes regions during the MWP, this research further compares the chronology of sand dune evolution in both regions during the Holocene. To test this relationship, published literature from both regions was reviewed and all published radiocarbon and luminescence ages reported were logged, including 348 ages from the Great Plains and 246 ages from the Great Lakes region. Ages were used to construct probability density distributions, inform Principal Components Analysis (PCA), and construct time-slice maps to compare and contrast dune evolution events over the past 7000 years. Based upon interpretation of the results of this study, dune activation events have likely been taking place in both regions from ~4400 years ago to the present. Given the apparent similarity in dune activity in both regions, the potential of climate factors such as El Niño frequency and SST fluctuations to have major impacts on the evolution of dune systems in both regions is possible.
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- Title
- A geochemical and hydrological investigation of a modern coastal marine sabkha
- Creator
- Gudramovics, Robert
- Date
- 1981
- Collection
- Electronic Theses & Dissertations
- Title
- A new chart of the coast of New England, Nova Scotia, New France or Canada : with the islands of Newfoundld., Cape Breton, St. John's & c
- Creator
- Bellin, Jacques Nicolas, 1703-1772
- Date
- 1746
- Collection
- Maps
- Description
-
Map showing the Maritime Provinces, Newfoundland, part of Labrador, part of New England to Boston, and the St. Lawrence Valley region to Quebec City. Emphasizes coastal details.
- Title
- Coastline change at four sites in Lower Michigan
- Creator
- Wernette, Phillipe Alan
- Date
- 2012
- Collection
- Electronic Theses & Dissertations
- Description
-
This study tested a new method of coastline change analysis to examine coastline change at four sites along the Lower Michigan coast. Shoreline position was manually delineated from aerial photography for multiple years between 1938 and 2010. The positional uncertainty associated with each shoreline was calculated in a GIS. A new method was developed to analyze the digitized shorelines. This new method generates a buffer (epsilon band) with radius equal to the positional uncertainty around...
Show moreThis study tested a new method of coastline change analysis to examine coastline change at four sites along the Lower Michigan coast. Shoreline position was manually delineated from aerial photography for multiple years between 1938 and 2010. The positional uncertainty associated with each shoreline was calculated in a GIS. A new method was developed to analyze the digitized shorelines. This new method generates a buffer (epsilon band) with radius equal to the positional uncertainty around each shoreline and uses these buffers to visualize and test for significant change. Significant change is determined by comparing a calculated proportion of similarity to a user-defined threshold. A series of transects perpendicular to the shoreline were then used to determine the direction and magnitude of change. Results indicate that shoreline position was most dynamic at the Manistee County site, and was least dynamic at the Sanilac County site. Overall there were more pairs of years with significant shoreline change at the two west coast sites, which suggests that shoreline position is more variable at the two sites along the west coast of Lower Michigan than along the east coast of Lower Michigan. The principle advantage of this dual epsilon method is that it analyzes change along the entire shoreline. This study demonstrates that the dual epsilon band method is feasible along a tideless coast.
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