Coastal hazard field investigations in response to the November 2011 Bering Sea storm, Norton Sound, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Coastal hazard field investigations in response to the November 2011 Bering Sea storm, Norton Sound, Alaska
Abstract:
On November 8, 2011, an extra-tropical cyclone with a low pressure of 945 millibars developed over the Bering Sea and moved northeast across the western coast of Alaska. This large storm brought high winds (gusts of up to 85 mph) to the entire region and a storm surge of approximately 3 meters to parts of Norton Sound. The storm caused extensive flooding in the lower portion of Golovin on the afternoon of November 9, 2011. A team of Alaska Division of Geological & Geophysical Surveys (DGGS) scientists visited Golovin on November 15, 2011, to document peak water levels, runup elevations, and inundation extents caused by this event. These data were combined with photographs taken by local residents during the event and elevation data from the 2004 DCCED Community Map to generate inundation limit lines.
Supplemental_Information:
The primary file of this data distribution package is a shapefile which shows the extent of the November 9, 2011 flooding in Golovin, AK. The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships. Attribute information for the layers is included in this metadata file under the "Entity_and_Attribute_Information" section. The layers are titled: >flood-extent-golovin-ak-11-09-12: Golovin, Alaska, November 2012 flood extent >border: outline shape of the study area
  1. How should this data set be cited?

    Kinsman, N.E.M., and DeRaps, M.R., 2012, Coastal hazard field investigations in response to the November 2011 Bering Sea storm, Norton Sound, Alaska: Report of Investigation RI 2012-2 v. 1.1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 51 p., 1 sheet.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -163.044845
    East_Bounding_Coordinate: -163.030693
    North_Bounding_Coordinate: 64.546407
    South_Bounding_Coordinate: 64.540386

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 09-Nov-2011
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: map sheet and vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a vector data set.

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 3
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -165
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000001
      Ordinates (y-coordinates) are specified to the nearest 0.000001
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is North American Datum of 1983.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    ri2012-2-flood-extent-golovin-ak-11-09-12.shp
    Lines demarcating the limit of inundation. (Source: Alaska Division of Geological & Geophysical Surveys, this report)

    Comment
    Comment about inundation limit line (Source: Alaska Division of Geological & Geophysical Surveys, this report)

    Comment explaining the location of flood water relative to the line

    ri2012-2-border.shp
    polygon outlining general boundary of data extent (Source: Alaska Division of Geological & Geophysical Surveys)


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    This RDF is funded with qualified outer continental shelf oil and gas revenues by the Coastal Impact Assistance Program, U.S. Fish and Wildlife Service, and U.S. Department of the Interior. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government. A draft version of this work was reviewed by Golovin community members for accuracy and to resolve gaps in observed inundation extents as well as discrepancies between 2004 DCCED elevations and present-day conditions. The DGGS team would like to extend their deepest gratitude to all of the community members who took the time to share their videos, photographs, and observations and to those who provided the feedback that improved this map.

  3. To whom should users address questions about the data?

    Alaska Division of Geological & Geophysical Surveys
    c/o James Weakland
    GIS Analyst
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5029 (voice)
    dggsgis@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays


Why was the data set created?

The purpose of this shapefile is to show the extent of the November 9, 2011 flooding in Golovin, AK.


How was the data set created?

  1. From what previous works were the data drawn?

    Community Profile Map, Golovin, 2004 (source 1 of 1)
    Alaska Department of Commerce, Community and Economic Development, and Kawarak-Incorporated, 2004, Golovin Community Map, Sheet 1.

    Online Links:

    Type_of_Source_Media: image
    Source_Contribution: Provided elevation information and high resolution imagery.

  2. How were the data generated, processed, and modified?

    Date: Nov-2012 (process 1 of 4)
    Fieldwork - Investigations following the November 8th storm consisted of one day of fieldwork during which the DGGS team was able to measure 32 flood indicators and collect personal accounts, photos and video from residents.

    Date: Mar-2012 (process 2 of 4)
    Digitization of flood extent - The position of the inundation limit lines were first determined using the flood indicators measured in the field and photographs taken by local residents during the event. The lines were then fine tuned using the digital elevation model derived for the 2004 DCCED (Alaska Department of Commerce, Community, and Economic Development) Community Profile Map.

    Data sources used in this process:

    • Community Profile Map, Golovin, 2004

    Date: Apr-2012 (process 3 of 4)
    Revision of flood extent - The inundation limit lines were revised in response to comments from Golovin residents whom were present during the flooding event.

    Date: 17-May-2012 (process 4 of 4)
    Metadata creation - Metadata for this map was compiled by Meagan DeRaps and Nicole Kinsman.

  3. What similar or related data should the user be aware of?

    DeRaps, M.R., and Kinsman, N.E.M., 2012, Spatially referenced oblique aerial photography of the Eastern Norton Sound shoreline, July 2011: Raw Data File RDF 2011-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 3 DVDs
    DeRaps, M.R., and Kinsman, N.E.M., 2012, Spatially referenced oblique aerial photography of the Golovin shoreline, July 2012: Raw Data File RDF 2012-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 2 p
    Gray, Glenn, Smith, J.R., and Kinsman, N.E.M., 2012, Annotated bibliography series in support of coastal community hazard planning-Northwest Alaska; Chapter R, Shaktoolik: Miscellaneous Publication MP 147R, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: p. 1-15
    Sallenger, A.H., Jr., 1983, Measurements of debris-line elevations and beach profiles following a major storm; northern Bering Sea coast of Alaska: Open-File Report OF 83-394, U.S. Geological Survey, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 11 p
    Smith, J.R., Gray, Glenn, and Kinsman, N.E.M., 2012, Annotated bibliography series in support of coastal community hazard planning-Northwest Alaska: Miscellaneous Publication MP 147, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 5 p
    Smith, J.R., and Kinsman, N.E.M., 2012, Annotated bibliography series in support of coastal community hazard planning-Northwest Alaska; Chapter E, Golovin: Miscellaneous Publication MP 147E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: p. 1-6
    Smith, J.R., and Kinsman, N.E.M., 2012, Annotated bibliography series in support of coastal community hazard planning-Northwest Alaska; Chapter U, Unalakleet: Miscellaneous Publication MP 147U, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: p. 1-9


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Certainty in placement of the inundation limit line is dependent on accurate identification of flood indicators in the field; these included the measurement of debris lines, water and slush limits in the snow, and elevations of visibly overtopped or inundated areas. Each measured flood indicator was assigned a qualitative confidence level to reflect the validity of inferring marine flood levels from the measurement. High confidence was applied to locations where evidence of a discrete water level was readily observed in the field (slush lines, for example). Medium confidence was applied to points that were measured at the best approximation of the water position based on partially obscured or indiscrete evidence (tension cracks in snow or many of the photo-identified points, for example). Lowest confidence was applied to points where the role of floodwater in the creation of a flood indicator was ambiguous, where locations were identified solely from the memories of residents, or where clean-up activities had modified the site enough to conceal the exact location of the flood extent. The elevation of the measured flood indicators as well as associated confidence levels are outlined in a table on Sheet 1 of the accompanying report.

  2. How accurate are the geographic locations?

    The inundation limit line has a horizontal positional accuracy dependent on: 1) The error associated with the 32 field measurements of flood indicators. Measurements were obtained using a Topcon survey grade GPS, horizontal precision values were calculated using Topcon office software to be less than 10 cm. 2) The error associated with the position and elevation of contours on the DCCED community map. The DCCED map accuracy is reported as meeting National Cartographic Mapping Standards (90% of defined horizontal points are accurate to within 2 feet, 90% of elevations are accurate to within 1 foot).

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Due to the morphology of the Golovin coastline, which shelters the community from direct wave attack, the paucity of runup limit indicators and the short amount of time available in the field, the flood inundation limit line does not extend to the exposed (Golovin Bay) side of the community. However, reported accounts from several residents indicated that a protective band of slush helped to reduce the wave energy on the southern side of the community. Our observations supported these accounts because there was no evidence of waves overtopping the crest of the ice ridge along the Golovin Bay coast, except at the very southwestern tip of the peninsula near the old airport. For more information about the location and elevation of the measured flood indicators used to produce this inundation limit line see map sheet 1 of the accompanying report.

  5. How consistent are the relationships among the observations, including topology?

    not applicable


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    RI 2012-2

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 09-Oct-2012
Metadata author:
Metadata manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.6 on Wed Mar 20 13:00:43 2013