Preliminary reconnaissance inventory map data of landslides and related features, South Manitou Island, Sleeping Bear Dunes National Lakeshore, Michigan
Dates
Publication Date
2022-03-01
Start Date
2012-04-04
End Date
2016-03-06
Citation
Ashland, F.X., 2022, Preliminary reconnaissance inventory map data of landslides and related features, South Manitou Island, Sleeping Bear Dunes National Lakeshore, Michigan: U.S. Geological Survey data release, https://doi.org/10.5066/P9SQWQ37.
Summary
Pluvials can have dramatic impacts on the shoreline bluffs of Lake Michigan due to increases in both shallow subsurface moisture conditions related to the prolonged wet weather pattern and wave erosion as the lake level rises. These changes can result in an increased frequency and magnitude of slope failures. During the most recent pluvial, the monthly average level of Lake Michigan rose 1.9 m from a record low in January 2013 to a near record high in June-July 2020. To assess the impacts on coastal bluffs from slope failures during the recent pluvial, an inventory of landslides was completed, including slope failures active during the early part of the pluvial, on the coastal bluffs of South Manitou Island, part of the Sleeping Bear [...]
Summary
Pluvials can have dramatic impacts on the shoreline bluffs of Lake Michigan due to increases in both shallow subsurface moisture conditions related to the prolonged wet weather pattern and wave erosion as the lake level rises. These changes can result in an increased frequency and magnitude of slope failures. During the most recent pluvial, the monthly average level of Lake Michigan rose 1.9 m from a record low in January 2013 to a near record high in June-July 2020. To assess the impacts on coastal bluffs from slope failures during the recent pluvial, an inventory of landslides was completed, including slope failures active during the early part of the pluvial, on the coastal bluffs of South Manitou Island, part of the Sleeping Bear Dunes National Lakeshore in Michigan. Landslides were mapped using high-resolution orthoimagery, collected in April 2012, and high-resolution topography derived from two LiDAR data sets, the first collected in December 2014 and the second collected between November 2015 and March 2016. This data release presents geographic information system (GIS) data, provided as line and polygon shapefiles (.shp), depicting landslides and related landforms and features. Polygon map data delineates the areas of deposits, source areas, and related landforms (such as alluvial fans and colluvial aprons). Scarps (such as headscarps and minor scarps) are presented as hachured line data. An attribute file is included providing a definition of the mapped units and a brief description of the approach used in the mapping.
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Summary Metadata for Preliminary reconnaissance inventory map data.xml Original FGDC Metadata
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19.78 KB
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SMI_Inventory_Shapefiles.zip
343.73 KB
application/zip
Metadata_Shapefiles.zip
170.39 KB
application/zip
Purpose
The purpose of this mapping was to create an inventory of historical (recent and pre-existing) landslides on the coastal bluffs of South Manitou Island in Lake Michigan, part of the Sleeping Bear Dunes National Lakeshore. High-resolution orthoimagery, dated April 4, 2012, and topography from two LiDAR data sets collected in December 2014 and from November 2015 through March 2016, respectively, were used to identify and map landslides and related features. The range in dates of the imagery temporally overlapped with the early part of a recent pluvial that resulted in 1.9 m rise in the monthly average level of Lake Michigan between January 2013 and July 2020. The areas of active slope movement identified using aerial imagery and topography, dated between April 2012 and March 2016, defined the extent and magnitude of landsliding directly prior to the onset of and during the early part of the recent pluvial and provided insight into the types and mechanisms of the slope failures.
Level 1 revision completed on May 19, 2022. The error is limited to the Dataset Title which does not match the file name except for two of the metadata files in the metadata zipped folder.