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.
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. See the text from this open-file report for a discussion of tsunami wave arrival data and a complete map of wave arrival times for the region.
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. See the text from this open-file report for a discussion of evacuation delay.
This feature class contains an identification number linking each zone with its evacuation routes as well as the time of tsunami wave arrival time (using the L1 tsunami scenario) at each zone safety destination.
We evaluated pedestrian evacuation in the Port Orford area of Curry County, Oregon in the event of a local tsunami generated by an earthquake on the Cascadia subduction zone (CSZ). Our analyses focused on a maximum-considered CSZ tsunami event covering 100% of potential variability, termed XXL1 and generated by a magnitude 9.1 earthquake. The unfortunate reality is that surviving the XXL1 tsunami in some locations is going to be extremely difficult or impossible. Therefore we also evaluated pedestrian evacuation for the Large tsunami scenario, termed L1, which covers 95% of potential variability and is generated by a magnitude 9.0 earthquake. L1 results are only located in a subset of the area covered by XXL1 results. This 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. See the text from this Open-file Report O-20-05 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 https://www.oregongeology.org
This project was funded by a grant through the Coastal Zone Management Act of 1972, as amended, administered by the Office for Coastal Management, National Oceanic and Atmospheric Administration (NOAA) under award No. NA17NOS4730145. The NOAA grants were dispensed to DOGAMI through sub-awards #PS17032 provided by the Oregon Department of Land Conservation and Development (DLCD).
All attributes were checked using automated QAQC tools designed specifically for tsunami data. Attributes were also reviewed visually in ArcGIS.
The following topology checks were performed and any errors were resolved: Must Be Single Part and Must Not Overlap.
This feature class provides the nearest safety destination for every point in the inundation zone along all road, trail, and beach networks (per local government review) for the Port Orford area of Curry County, Oregon. For XXL1 and L1 results, this is defined as the area south of Silver Butte Road and north of Hubbard Creek.
Horizontal positional accuracy is very good because evacuation flow zones are derived from path distance results.
Not Applicable
This feature class was generated using Esri ArcGIS 10.7 and Esri ArcPro 2.5 software. 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 to evacuation flow zones include several from the Hydrology Toolbox and the backlink raster. Most of the methodology for these processes are established in Priest et al, 2016 and Gabel et al, 2018b. The source tsunami modeling data can be found in Priest et al, 2013a and Priest et al 2013b. See the text from this open-file report for technical information on mapping methods.
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 https://www.oregongeology.org
This feature class contains an identification number linking each zone with its evacuation routes as well as the time of tsunami wave arrival time (using the L1 tsunami scenario) at each zone safety destination.
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 https://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 https://www.oregongeology.org