Event Title

Qualitative Analysis of Bluff Erosion and Changes in the Le Sueur River

Location

CSU Ballroom

Start Date

20-4-2015 2:00 PM

End Date

20-4-2015 3:30 PM

Student's Major

Geography

Student's College

Social and Behavioral Sciences

Mentor's Name

Cindy Miller

Mentor's Email Address

cynthia.miller@mnsu.edu

Mentor's Department

Geography

Mentor's College

Social and Behavioral Sciences

Description

Over time, the Le Sueur River has been undergoing channel changes and creating bluff erosion in Southern Minnesota. The bluff erosion has become a threat to homes near the river causing them to be in danger of destruction. While other researchers have mapped river changes using two years of imagery, we analyzed five sets of aerial photos, ranging from 1939 to the present, of a study area southeast of Mankato to determine the extent of bluff erosion, channel changes and threats to residents. This series of images allowed us to see whether the stream changes have been steady or increasing at a more rapid rate than in the past. We interpreted the photos using Stereo Analyst in ERDAS Imagine and created anaglyphs to interpret erosion processes in stereo. We also digitized the river’s course in ArcGIS to map the changes in course and erosion over time. Spatial Analyst allowed us to produce a detailed 3-D shaded relief model of the river channel to illustrate the geomorphic changes occurring in the area over time. Our conclusion determines whether bluff erosion on the Le Sueur River is increasing as time goes on. This research could affect future development and zoning restrictions in the area.

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Apr 20th, 2:00 PM Apr 20th, 3:30 PM

Qualitative Analysis of Bluff Erosion and Changes in the Le Sueur River

CSU Ballroom

Over time, the Le Sueur River has been undergoing channel changes and creating bluff erosion in Southern Minnesota. The bluff erosion has become a threat to homes near the river causing them to be in danger of destruction. While other researchers have mapped river changes using two years of imagery, we analyzed five sets of aerial photos, ranging from 1939 to the present, of a study area southeast of Mankato to determine the extent of bluff erosion, channel changes and threats to residents. This series of images allowed us to see whether the stream changes have been steady or increasing at a more rapid rate than in the past. We interpreted the photos using Stereo Analyst in ERDAS Imagine and created anaglyphs to interpret erosion processes in stereo. We also digitized the river’s course in ArcGIS to map the changes in course and erosion over time. Spatial Analyst allowed us to produce a detailed 3-D shaded relief model of the river channel to illustrate the geomorphic changes occurring in the area over time. Our conclusion determines whether bluff erosion on the Le Sueur River is increasing as time goes on. This research could affect future development and zoning restrictions in the area.

Recommended Citation

Meyer, Samantha and Nate Kirkwold. "Qualitative Analysis of Bluff Erosion and Changes in the Le Sueur River." Undergraduate Research Symposium, Mankato, MN, April 20, 2015.
http://cornerstone.lib.mnsu.edu/urs/2015/poster_session_B/26