Clatsop Plains Active Hazard Zone, 2001
Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Distribution_Information
Metadata_Reference_Information
Identification Information
Section Index
Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains Active Hazard Zone, 2001
Edition: V. 1
Geospatial Data Presentation Form: Map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Other Citation Details:
This data is a digital representation of the mapped active
erosion hazard zone on the Clatsop Plains. This is a
preliminary, unpublished data set.
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Description:
Abstract:
This report describes and documents a range of coastal
hazard zones distinguished for the Clatsop Plains. In
particular, the report focuses on identifying maximum
potential erosion distances for dune-backed shorelines
using the geometric model developed by Komar and others
(1999). Four hazard zones have been identified for the
Clatsop Plains, an active hazard zone characterized by
existing, active erosion processes, and three zones of
potential future erosion, high, moderate, and low risk
zones that respectively depict decreasing risks of becoming
active in the future. Of most interest to planners are the
landward boundaries of the high and low risk zones. The
landward boundary of the high-risk zone defines a
conservative but reasonable limit of expansion of the
active hazard zone in the next 60-100 years. The landward
boundary of the low-risk zone defines the outermost limit
of expansion of the active hazard zone associated with a
catastrophic event such as a great earthquake on the
Cascadia subduction zone, coupled with severe storms.
· Hazard zones were determined along the Clatsop Planes
using a geometric model developed by Komar and others
(1999), whereby property erosion occurs when the total
water level produced by the combined effect of extreme wave
runup (R) plus the tidal elevation (ET), exceeds some
critical elevation of the fronting beach, typically the
elevation of the beach-dune junction (EJ). Three scenarios
were used to model erosion hazard zones on dune-backed
beaches: 1 (HIGH-risk). This scenario is based on a large
storm wave event (wave heights ~47.6 ft high) occurring
over the cycle of an above average high tide, coincident
with a 3.3 ft storm surge. Under this scenario, the
designated HIGH-risk hazard zone was estimated to be 360
ft, while individual beach sites may vary by a much as 243
ft to 522 ft due to subtle differences in the character of
the beach (beach slope and beach/dune junction)
The following two scenarios (MODERATE and LOW-risk events)
are one of two ""worst case"" events identified for the
Clatsop coastline. Both scenarios have low probabilities of
occurrence. 2 (MODERATE-risk). This scenario is based on an
extremely severe storm event (waves ~52.5 ft high) coupled
with a large storm surge of 5.6 ft. Under this particular
scenario, the maximum potential erosion distances (MPED)
vary considerably, with an average MPED that ranged from
390 to 825 ft, while the designated width of the moderate
hazard zone was established at 572 ft.
· Scenario 3 (LOW-risk). This scenario is similar to
scenario 2 above but incorporates a 3.3 ft vertical
lowering of the coast as a result of a Cascadia subduction
zone earthquake. MPED estimated for scenario 3 ranged from
424 to 938 ft, while the designated width of the low hazard
zone was established at 635 ft.
Purpose:
To delineate the active coastal erosion hazard zone of
Clatsop County.
Time Period of Content:
Currentness Reference: June, 2001
Status:
Progress: Complete
Maintenance and Update Frequency: Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -120.3783
East Bounding Coordinate: -120.3185
North Bounding Coordinate: 46.2618
South Bounding Coordinate: 46.0205
Keywords:
Theme:
Theme Keyword Thesaurus: None
Theme Keyword: Erosion
Theme Keyword: Shoreline
Theme Keyword: Hazards
Place:
Place Keyword Thesaurus: None
Place Keyword: Clatsop
Place Keyword: Gearhardt
Place Keyword: Fort Stevens
Place Keyword: Warrenton
Access Constraints: None
Use Constraints:
Data is preliminary and has been reviewed; use with
appropriate caution. This material has not yet been published.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Oregon Department Of Geology and Mineral Industries
Contact Person: Jonathan C Allan
Contact Position: Coastal Geomorphologist
Contact Address:
Address Type: mailing and physical address
Address: DOGAMI Coastal Field Office, 313 SW 2nd, Suite D
City: Newport
State or Province: Oregon
Postal Code: 97365
Country: USA
Contact Voice Telephone: 541-574-6658
Contact Electronic Mail Address: jonathan.allan@state.or.us
Native Data Set Environment: ArcView version 3.3 shapefile format
Data Quality Information
Section Index
Logical Consistency Report:
This set of polygons and description attributes for
currently active coastal erosion hazard areas along the
Clatsop County coast includes both direct wave attack
hazard areas and historical shoreline positions.
Completeness Report:
The data set is complete for meeting the requirements of
the contract with Clatsop County. This data set has not
been published.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
is tested by visual comparison of hard copy check plots to the source materials
and verifying the location of the data on-screen relative
to other data layers in the same geographic area.
Accuracy is ±33 feet for the eastern side of the
polygons; ±40 feet for the western side. Eastern side of
polygons accuracy explanation: standard error for
1:12,000-scale USGS digital orthophoto quadrangles used for
plotting. Western side of polygons: standard error for
1:24,000-scale USGS digital raster quadrangles used for
shoreline position.
Vertical Positional Accuracy:
Vertical Positional Accuracy Report:
Varies depending on contour interval for the respective
USGS topographic quadrangle. This maximum vertical
positional error is one contour on the respective USGS quadrangle.
Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 187x Shoreline : Gearhardt to Fort Stevens
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 1926 Shoreline
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 195x Shoreline
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 1995 Shoreline
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 1997 Shoreline
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 1998 Shoreline
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains 1999 Shoreline
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains Low Dune Hazard Zone
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains Moderate Dune Hazard Zone
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains High Dune Hazard Zone
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Source Information:
Source Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication Date: 20010630
Title: Clatsop Plains Active Hazard Zone
Edition: V. 1
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Portland, OR
Publisher: Oregon Department of Geology and Mineral Industries
Online Linkage: http://www.oregongeology.com
Larger Work Citation:
Citation Information:
Originator: Oregon Department of Geology and Mineral Industries
Title: Coastal Erosion Hazard Zones Along the Clatsop Plains, Oregon
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Time: Unknown
Ending Time: Unknown
Process Step:
Process Description:
Dataset credit goes to Paul Staub and Mark Neuhaus, Oregon
Department of Geology and Mineral Industries
Process Date: 2001
Cloud Cover: 0
Spatial Data Organization Information
Section Index
Direct Spatial Reference Method: Vector
Point and Vector Object Information:
SDTS Terms Description:
SDTS Point and Vector Object Type: GT-polygon composed of chains
Point and Vector Object Count: 1
Spatial Reference Information
Section Index
Horizontal Coordinate System Definition:
Planar:
Map Projection:
Map Projection Name: Lambert Conformal Conic
Lambert Conformal Conic:
Standard Parallel: 43
Standard Parallel: 45.5
Longitude of Central Meridian: -120.5
Latitude of Projection Origin: 41.75
False Easting: 400000
False Northing: 0
Planar Coordinate Information:
Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:
Abscissa Resolution: 0
Ordinate Resolution: 0
Planar Distance Units: international feet
Geodetic Model:
Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257
Distribution Information
Section Index
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: Oregon Department Of Geology and Mineral Industries
Contact Person: Jonathan C Allan
Contact Position: Coastal Geomorphologist
Contact Address:
Address Type: mailing and physical address
Address: DOGAMI Coastal Field Office, 313 SW 2nd, Suite D
City: Newport
State or Province: Oregon
Postal Code: 97365
Country: USA
Contact Voice Telephone: 541-574-6658
Contact Electronic Mail Address: jonathan.allan@state.or.us
Resource Description:
COASTAL EROSION HAZARD ZONES ALONG THE CLATSOP
PLAINS,OREGON: GEARHART TO FORT STEVENS: Active_hazard_zone
Distribution Liability:
This is unpublished data and has not gone through the
Oregon Department of Geology's publication standards process.
Standard Order Process:
Digital Form:
Digital Transfer Information:
Format Name: MapInfo table (.tab), ArcInfo (.e00) and ArcView shape (.shp)
Digital Transfer Option:
Metadata Reference Information
Section Index
Metadata Date: 1/22/2003
Metadata Review Date: 1/22/2004
Metadata Future Review Date:
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
Oregon Ocean Coastal Management Program - Department of
Land Conservation and Development
Contact Person: Tanya Haddad
Contact Position: Coastal Atlas Project Team
Contact Address:
Address Type: Mailing and physical address
Address: 800 NE Oregon Street #18
City: Portland
State or Province: Oregon
Postal Code: 97232
Country: USA
Contact Voice Telephone: 503-731-4065 x30
Contact Facsimile Telephone: 503-731-4068
Contact Electronic Mail Address: tanya.haddad@state.or.us
Metadata Standard Name: FGDC CSDGM
Metadata Standard Version: FGDC-STD-001-1998
SMMS Metadata report generated 1/24/2004