Beach foreshore slope for the East Coast of the United States

Dates

Publication Date: 2024-07-12
Start Date: 1997-09-15
End Date: 2018-08-07

Citation

Farris, A.S., and Weber, K.M., 2024, Beach foreshore slope for the East Coast of the United States: U.S. Geological Survey data release, https://doi.org/10.5066/P13FC6SW.

Summary

This data release contains foreshore slopes for primarily open-ocean sandy beaches along the East Coast of the United States (Maine through Florida). The slopes were calculated while extracting shoreline position from lidar point cloud data collected between 1997 and 2018. The shoreline positions have been previously published, but the slopes have not. A reference baseline was defined, and then 20-meter equally-spaced cross-shore beach transects were created perependicular to the baseline. All data points within 1-meter (along-shore) of each transect were associated with that transect. For each transect, the points on the foreshore were identified, and a linear regression was fit through the foreshore points. Beach slope was defined [...]

Summary

This data release contains foreshore slopes for primarily open-ocean sandy beaches along the East Coast of the United States (Maine through Florida). The slopes were calculated while extracting shoreline position from lidar point cloud data collected between 1997 and 2018. The shoreline positions have been previously published, but the slopes have not. A reference baseline was defined, and then 20-meter equally-spaced cross-shore beach transects were created perependicular to the baseline. All data points within 1-meter (along-shore) of each transect were associated with that transect. For each transect, the points on the foreshore were identified, and a linear regression was fit through the foreshore points. Beach slope was defined as the slope of the regression. The regression was evaluated at the elevation of mean high water (MHW) to yield the cross-shore location of the shoreline. In areas where more than one lidar survey is available, the slopes from each survey are provided. While most of the slopes are for sandy beaches, there are some slope data from rocky headlands and other steeper beaches. The slope data files (slopeData_EastCoast.csv and slopeData_EastCoast.shp) contain beach slope, the location at which the beach slope data was calculated (the shoreline position), and the estimated uncertainty of the shoreline position. The reference line data files (referenceLine_EastCoast.csv and referenceLine_EastCoast.shp) contain information about the reference baseline, the cross shore transects, and the MHW values used to estimate the shoreline location. Both file types *.csv (an ascii file containing comma seperated values) and *.shp (binary files supported by Esri known as shapefiles) contain the same information. Both file types are provided as a convenience to the user.

Contacts

Point of Contact :: Amy Farris
Originator :: Amy Farris, Kathryn M Weber
Data Owner :: Woods Hole Coastal and Marine Science Center
USGS Program :: Coastal and Marine Hazards and Resources Program
Publisher :: U.S. Geological Survey
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: Woods Hole Coastal and Marine Science Center
USGS Mission Area :: Natural Hazards

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eastCoastMetadata.xml Original FGDC Metadata	View	66.64 KB	application/fgdc+xml
browseGraphicEastCoast.jpg “Sample data on a small Massachusetts beach”		2.39 MB	image/jpeg
referenceLine_EastCoast.csv		19.33 MB	text/csv
slopeData_EastCoast.csv		23.39 MB	text/csv

Shapefile: referenceLine_EastCoast.zip
referenceLine_EastCoast.dbf		15.7 MB
referenceLine_EastCoast.prj		145 Bytes
referenceLine_EastCoast.shp		4.4 MB
referenceLine_EastCoast.shx		1.26 MB

Shapefile: slopeData_EastCoast.zip
slopeData_EastCoast.dbf		22.6 MB
slopeData_EastCoast.prj		145 Bytes
slopeData_EastCoast.shp		8.91 MB
slopeData_EastCoast.shx		2.55 MB

Purpose

Beach slope is a critical metric for coastal hazards science and is also necessary when extracting shorelines from satellite imagery. Shorelines derived from satellite data must be tidally-corrected to a reference elevation using the slope of the beach. The beach slope data presented here will be beneficial for advancing our understanding of coastal processes and for quantifying and predicting shoreline change and storm impacts along the Atlantic coast.

Beach foreshore slope for the East Coast of the United States

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