DOGAMI Open-File Report Series

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Open-File Report O-12-08, An “expanded” geospatial database of beach and bluff morphology determined from lidar data collected on the northern Oregon coast: Tillamook and Clatsop Counties, by Jonathan C. Allan and Erica L. Harris. PDF report, Excel spreadsheets, Esri ArcGIS v. 10 geodatabases.

Order publication CD-ROM, $15, from Nature of the Northwest.

Deliverables of this study include the following:

  1. Text report: 27-page PDF.

  2. Microsoft Excel worksheets for all transect sites:
    - Clatsop_morphology_parameters.xlsx
    -Tillamook_morphology_parameters.xlsx

  3. Esri ArcGIS geodatabases containing geospatial information (e.g., shorelines, beach/dune juncture lines, transect lines etc.):
    - clatsop_coastal_lidar_analyses_Final.gdb
    - tillamook_coastal_lidar_analyses_Final.gdb

Abstract

This study developed a coastal geomorphic database that describes the morphological parameters of beaches, dunes, and bluffs present along the central to northern Oregon coast, specifically in Clatsop and Tillamook Counties. The completed product includes a variety of geospatial data layers including transect locations; site-specific information on the slope of the beach, dune, or bluff crest; coastal change information for selected years; and visual products that synthesize several of the identified parameters to enable easy access to information on beach, dunes, and bluffs. This study extends a previous investigation by Allan and Hart (2007) by undertaking more detailed morphological analyses of the beaches and dunes, employing a higher sampling frequency (minimum profile spacing of ~ 25 m as opposed to 100 m [i.e., 4 times the number of transects]), and expanding the effort to include the coastal bluffs and headlands that, respectively, back and bound pocket beach littoral cells along the Oregon coast. The outcome of this study is a detailed geospatial database of the beaches and bluffs on the northern Oregon coast, which includes a variety of morphological information, such as beach slope, beach/dune (bluff) juncture elevation and positions, beach/dune (bluff) crest elevation and positions, dune (bluff) face slope, primary frontal dune locations, and the landward limit of the lee or reverse slope of the foredune, where present. Additional information documenting coastal change data was also derived for the 6 m (19.7 ft) contour elevation. These latter data may be used to assess the response of beaches in Clatsop and Tillamook Counties to specific periods when major events occurred (e.g., the 1997-1998 El Nińo and the extreme 1998-1999 winters) at individual locations or for entire sections of the coast.