Kinsman, N.E.M. 2015 report and digital data Raw Data File RDF 2015-2 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 14 p. http://dx.doi.org/10.14509/29348 Nearshore bathymetry is a vital link that joins offshore water depths to coastal topography. Seamless water depth information is a critical input parameter for reliable storm surge models, enables the calculation of sediment budgets, and is necessary baseline data for a range of coastal development decisions. Bathymetric data collection capabilities of an active coastal geohazard field program operated by the Alaska Division of Geological & Geophysical Surveys (DGGS) were expanded in 2012. Resultant datasets presented in this report include nearshore bathymetric measurements of critical shallow-water coastal areas in the vicinity of six western Alaska communities: Gambell, Golovin, Hooper Bay, Savoonga, Shishmaref, and Wales. These data are provided in the form of vector shiptracks and processed single-beam sounding point clouds. This work was completed with a low-cost, portable sonar system capable of shallow water measurements in rural settings; the system will be maintained for use or loan by DGGS for data collections of this type for the useful life of the equipment. One of the long-recognized gaps in many coastal datasets is water depth directly adjacent to the shoreline. In few places is this more true than in the data-sparse coastal waters of western Alaska. Between the marine depths and onshore elevations lies a critical zone to which traditional ship-based bathymetric surveys do not extend. These areas are best accessed with portable sonar systems attached to small watercraft capable of navigating shallow waters. Nearshore bathymetric data is a vital component to understanding how coastal storms impact landscapes because marine energy is dissipated (wave breaking) and transformed (wave refraction, shoaling) as it moves across this zone in high-energy storm events. Community-scale models of coastal storm impacts, tsunami inundation, and other scenario-based coastal hazard mapping require seamless topographic-bathymetric grids of depths and elevations transitioning from the marine to terrestrial environment. As many communities seek detailed inundation modeling for storm surge preparation and planning purposes, we need to fill gaps in baseline bathymetric data along Alaska's coast. Other uses for nearshore bathymetry include, but are not limited to, expanding our understanding of coastal/inlet dynamics, quantifying alongshore sediment budgets, calibrating bathymetric mapping with remote sensing platforms, monitoring nearshore benthic environments. This digital data distribution package provides the shiptrack shapefiles and point clouds of the associated single-beam soundings. >shiptracks: Sounding measurement acquisition path for Golovin (GLV), Wales (WAA), Shishmaref (SHH), and Hooper Bay (HPB). >soundings: A point cloud of the single-beam soundings for Golovin (GLV), Wales (WAA), Shishmaref (SHH), and Hooper Bay (HPB). 2012 2013 ground condition complete None planned -168.229679 -162.739389 66.334161 61.445048 ISO 19115 Topic Category geoscientificInformation Alaska Division of Geological & Geophysical Surveys Bathymetry Coastal Alaska Division of Geological & Geophysical Surveys Bering Sea Chukchi Sea Gambell Golovin Hooper Bay Hooper Bay Quadrangle Saint Lawrence Quadrangle Savoonga Shishmaref Shishmaref Quadrangle Solomon Quadrangle Teller Quadrangle Wales Yukon-Kuskokwim Delta Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America Holocene 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). 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. Alaska Division of Geological & Geophysical Surveys GIS Manager mailing and physical

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Fairbanks AK 99709-3707 USA (907)451-5020 dggsgis@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays In addition to support from the Western Alaska Landscape Conservation Cooperative (WALCC), this project received funding from qualified outer continental shelf oil and gas revenues through the Coastal Impact Assistance Program, U.S. Fish and Wildlife Service, 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 Western Alaska Landscape Conservation Cooperative or the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government. Special thanks are extended to our partners at the Alaska Ocean Observing System (AOOS) and to the local residents who worked with us in each community. DGGS staff and interns that participated in the collection and processing of this data include: Meagan DeRaps, Alexander Gould, Jacquelyn Overbeck (nee Smith), and Lauren Southerland. Local boat operators include: Jack Fagerstrom, Golovin; Jimmy Seetomona, Shishmaref; Amos Oxereok, Wales; Eddie Ungott, Gambell; Dylan Iya and Bryan Rookok, Jr., Savoonga; and James Hale and Rudy Smith, Hooper Bay. An accuracy assessment was conducted on each included dataset for quality assurance purposes. See table 2 in the accompanying report for methods and discussion of the full results. Not applicable Not applicable Horizontal uncertainty varies by community. See table 2 in the accompanying report for methods and discussion of the full results. Vertical uncertainty varies by community. See table 2 in the accompanying report for methods and discussion of the full results. Bathymetry survey - DGGS coastal hazards field crew spent one to three days collecting nearshore bathymetric measurements in areas adjacent to existing or proposed coastal development. Shiptracks were designed to be perpendicular to the shore, spaced at an interval appropriate to the opportunistic survey window, and aligned with onshore coastal elevation measurements, when available. Additional depth readings were focused on the mouths of inlets and in tidally-influenced lagoons, river mouths, or estuaries adjacent to developed areas. Water depths were measured from a small watercraft using an Ohmex SonarMite transducer with associated accessories and software consistent with the widely-used 'Hydrolite' System from Seafloor Systems. The echosounder has a 200 KHz frequency, 4 degree beam width, and a ping rate of 6 Hertz. This equipment was combined with a Topcon DGPS receiver, external antenna, and field controller. Some minor changes were made to the purchased system to make it more appropriate for fieldwork in Alaska; these included transom-mount modifications, replacement of the aluminum pole mount with a steel pole, and extended cables to keep the equipment away from saltwater regardless of what type of boat was used for the survey. Bathymetric survey equipment was fitted to boats available on site. Local boat operators were hired to pilot the sensor platforms, allowing our team to benefit from extensive local knowledge of coastal waters, ensure that planned tracks were feasible with the available boat, and maximize the inclusion of known bathymetric features of importance (for example, persistent sandbars). 2014 Post-survey processing - We conducted post-survey processing to correct for sensor position and assess final measurement accuracy. The steps involved in the data collection and post-processing workflow are illustrated in the accompanying report. 2014 point Universal Transverse Mercator 3 0.999600 -165 0 500000.000000 0 coordinate pair .01 .01 Meters North American Datum of 1983 GRS 80 6378137 298.257222101 NAVD88(GEOID12A) 0.01 Meters Explicit elevation coordinate included with horizontal coordinates rdf2015-2-GLV_shiptracks.shp, rdf2015-2-HPB_shiptracks.shp rdf2015-2-SHH_shiptracks.shp rdf2015-2-WAA_shiptracks.shp Sounding measurement acquisition path for Golovin (GLV), Wales (WAA), Shishmaref (SHH), and Hooper Bay (HPB). Alaska Division of Geological & Geophysical Surveys (DGGS) shiptracks Name Sounding Group Accompanying report, table 2 Sounding groups names are a concatenation of the community code and a group number. Group numbers were assigned sequentially based on the order of data collection. rdf2015-2-GLV_soundings.shp, rdf2015-2-HPB_soundings.shp rdf2015-2-SHH_soundings.shp rdf2015-2-WAA_soundings.shp A point cloud of the single-beam soundings for Golovin (GLV), Wales (WAA), Shishmaref (SHH), and Hooper Bay (HPB). Alaska Division of Geological & Geophysical Surveys (DGGS) soundings POINT_X Easting coordinate (meters) this report UTM Zone 3 POINT_Y Northing coordinate (meters) this report UTM Zone 3 POINT_Z depth (meters) this report NAVD88 (GEOID12A) Date Date the measurements were collected Alaska Division of Geological & Geophysical Surveys (DGGS) Bathymetric measurements collected in the 2012 and 2013 summer field seasons. Shiptrack Sounding group name Accompanying report, table 2 Sounding groups names are a concatenation of the community code and a group number. Group numbers were assigned sequentially based on the order of data collection. Alaska Division of Geological & Geophysical Surveys mailing and physical

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Fairbanks AK 99709-3707 USA (907)451-5020 (907)451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. RDF 2015-2 The State of Alaska makes no expressed 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. DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Contact DGGS for current pricing Shapefile http://dx.doi.org/10.14509/29348 Free download 20150327 Alaska Division of Geological & Geophysical Surveys Metadata Manager mailing and physical

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Fairbanks AK 99709-3707 USA (907)451-5020 FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. http://www.dggs.alaska.gov/metadata/dggs.ext dggs metadata extensions