St. Croix River : Shoreline Studies : 1995-2000
Johnson S, Shodeen M, Pitt DG, Whited DC, Hanson M, . O. 2001. St. Croix River : Shoreline Studies : 1995-2000. National Park Service. St. Croix Falls, WI
Changes in forest structure can be used as indicators of longer-term trends in island geomorphology. This report examines changes that have occurred between 1969 and 1991 in the forest area on the islands of the St. Croix River north of the Boomsite at Stillwater, Minnesota. Reconnaissance of aerial photographs flown between the Boomsite near Stillwater and the Soo Line Swing-bridge at a scale of 1 : 12,000 was used to differentiate water and herbaceous vegetation from forest vegetation on islands in the study area for 1969 and 1991. Polygons of forest vegetation in the study area were digitized into an Arc- Info™ geographic information system (GIS) database. The forest polygons were stratified and changes in forest polygon area were tabulated based on location relative to the Sandbar and relative to median area of forest polygons. These results were also displayed in map format. Between 1969 and 1991, the forested portions of the islands below the Areola Sandbar have become increasingly smaller and more fragmented while those above the Sandbar have become larger and more concentrated.
- Type
- Published Report
- Authors
- Johnson, Steve; Shodeen, Molly; Pitt, David; Whited, Diane; Hanson, Michele; ., Others
- Date of Issue
- 2001-05
- Publisher
- National Park Service
- Units
- SACN , WRD
- Keywords
- Clemson, Deposition, erosion condition, flow velocity, geomorphic change, qualitative assessment, shoreline sediment, shoreline survey, St. Croix River, Water Quality, WRBIB