Tags
The Flow_zone attribute provides an identification number for each evacuation flow zone. The actual value is arbitrary; the intention is to allow a user to differentiate flow zones in order to more clearly see the larger evacuation regime for a region. Flow_zone IDs link with the corresponding Evacuation Route feature class Flow_zone IDs.
Oregon Department of Geology and Mineral Industries
The time, in seconds, after the Cascadia Subduction Zone earthquake when the first wave reaches the point of safety for each evacuation flow zone. The first wave arrival is defined as the time at which tsunami flow depth reaches more than 0.5 ft.
Oregon Department of Geology and Mineral Industries
The wave arrival time, in seconds, for each evacuation zone minus 10 minutes to account for the time in which earthquake shaking takes place, as well as human disorientation, and the time required to evacuate buildings. It is these values that were used to calculate Beat the wave (BTW) evacuation speeds.
Oregon Department of Geology and Mineral Industries
This polygon feature class shows the nearest safety destination for every point in the inundation zone (on the road and trail network) assuming all non-retrofitted bridges within the inundation zone fail due to earthquake shaking.
We evaluated pedestrian evacuation in Astoria and nearby unincorporated communities of Clatsop County, Oregon in the event of a local tsunami generated by an earthquake on the Cascadia Subduction Zone (CSZ). This polygon feature class shows the nearest safety destination for every point in the inundation zone (on the road and trail network) assuming all non-retrofitted bridges within the inundation zone fail due to earthquake shaking. This layer was created based on the Extra-extra-large1 (XXL1) tsunami scenario, which is a Local Cascadia Subduction Zone (CSZ) tsunami scenario generated by a magnitude 9.1 earthquake. The XXL1 event has an estimated recurrence rate of at least 10,000 years. See the text from this Open-file Report O-22-01 for technical information on mapping methods and a discussion of results and interpretation.
The purpose of this data is to provide local government with a quantitative assessment of pedestrian evacuation in order to evaluate mitigation options such as evacuation route improvements, better wayfinding, land use planning actions, and potential vertical evacuation options.
None
REPORT DATA: This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication. See the accompanying text report for more details on the limitations of the methods and data used to prepare this publication.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
This project was funded by the National Oceanic and Atmospheric Administration (NOAA) through the National Tsunami Hazard Mitigation Program under award No. NA20NWS467006.
Statistics of all numeric attributes were generated and reviewed. Unique values and duplicate values for all text attributes were generated and reviewed. Any instances of NULL values or empty values were identified and reviewed for all attributes. Attributes were also reviewed visually in ArcMap.
Statistics of all numeric attributes were generated and reviewed. Unique values and duplicate values for all text attributes were generated and reviewed. Any instances of NULL values or empty values were identified and reviewed for all attributes. The coordinate system, bounding coordinate extent values, and all attribute field names were reviewed. Applicable topology checks were performed.
This dataset is complete for Astoria and nearby unincorporated communities of Clatsop County, Oregon. This is defined as the area between the Lewis and Clark River in the west and the John Day River to the east.
Horizontal positional accuracy is very good because evacuation flow zones are derived from path distance results. Tsunami simulations use unstructured computational grids constructed from detailed bathymetric and topographic data, particularly lidar. Spacing between computational grid points, a measure of the precision of this data, is generally less than 10 m in populated areas and at critical shoreline features such as jetties.
This is Not Applicable.
The path distance tool uses geospatial algorithms to calculate the most efficient route from each point in the evacuation zone to safety. Inputs include sub-sampled lidar and a road and trail network. Additional ArcGIS tools used to convert path distance results into this feature class include several from the Hydrology Toolbox and the backlink raster. This layer was generated using Esri ArcGIS 10.7 and Esri ArcPro 2.8 software.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
This polygon feature class shows the nearest safety destination for every point in the inundation zone (on the road and trail network) assuming all non-retrofitted bridges within the inundation zone fail due to earthquake shaking.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
Although these data have been processed successfully on a computer system at the Oregon Department of Geology and Mineral Industries, no warranty expressed or implied is made by DOGAMI regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org