Identification_Information: Citation: Citation_Information: Originator: Overbeck, J.R. Originator: Christian, J.E. Originator: Buzard, R.M. Publication_Date: 2021 Title: Single-beam bathymetry data near Napakiak, Alaska, collected June 2021 Geospatial_Data_Presentation_Form: table Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2021-15 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 6 p. Online_Linkage: https://doi.org/10.14509/30765 Description: Abstract: DGGS Raw Data File 2021-15, Single-beam bathymetry data near Napakiak, Alaska, collected June 2021, presents bathymetric data to assess coastal hazards and for river migration studies. The State of Alaska Division of Geological & Geophysical Surveys (DGGS) used a M2Ocean Hydroball-an integrated echosounder, Global Navigation Satellite System (GNSS) antenna, and inclinometer-to collect bathymetric transects near Napakiak on June 29-30, 2021. Bathymetric data were corrected using a coincident water level time series referenced to a vertical datum using GNSS survey. The bathymetric data were processed using CIDCO DepthStar. This data collection is being released as a Raw Data File with an open end-user license. This data collection is being released as a Raw Data File with an open end-user license. All files are available from the DGGS website: http://doi.org/10.14509/30765. Purpose: The goal of the Napakiak survey is to provide bathymetric data for the purpose of assessing coastal hazards and for river migration studies. Supplemental_Information: >hydro-soundings: single-beam bathymetric survey soundings Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20210629 Ending_Date: 20210630 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -161.985407 East_Bounding_Coordinate: -161.929659 North_Bounding_Coordinate: 60.704721 South_Bounding_Coordinate: 60.673175 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Bathymetry Theme_Keyword: Coastal and River Theme_Keyword: DGGS Theme_Keyword: Emergency Preparedness Theme_Keyword: Engineering Theme_Keyword: Engineering Geology Theme_Keyword: Environmental Theme_Keyword: Erosion Theme_Keyword: Flood Theme_Keyword: Geologic Theme_Keyword: Geologic Hazards Theme_Keyword: Geological Process Theme_Keyword: Geology Theme_Keyword: Geomorphology Theme_Keyword: Geotechnical Theme_Keyword: Hazards Theme_Keyword: Hydrology Theme_Keyword: Sediment Theme_Keyword: Sediment Transport Theme_Keyword: Sedimentation Theme_Keyword: Shoreface Theme_Keyword: Slope Instability Theme_Keyword: Surface Theme_Keyword: Surface Water Theme_Keyword: Surficial Theme_Keyword: Water Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Kuskokwim Basin Place_Keyword: Kuskokwim River Place_Keyword: Napakiak Place_Keyword: Southwest Alaska Place_Keyword: Yukon-Kuskokwim Delta 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Data_Set_Credit: This work was funded by the Bureau of Indian Affairs Tribal Resilience Program through a collaborative project with the Native Village of Napakiak. We especially thank Walter Nelson with the City of Napakiak for generous support and assistance in carrying out project logistics. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Not applicable Logical_Consistency_Report: The bathymetry data have been visually inspected for data errors such as false returns. Erroneous data were removed in the data processing, which may lead to gaps between and along transects. Additional data errors may exist due to increased wave activity during segments of surveys, however, these errors were not evaluated or removed. Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal accuracy was not evaluated. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: A quality control report was run in DepthStar to compute vertical offsets of overlapping points (intersections) throughout the survey. There were 50 intersections in total with an offset range between 0.006 m and 0.662 m and a vertical accuracy of 0.502 m at the 95th percentile. Lineage: Process_Step: Process_Description: Bathymetric survey - DGGS used a M2Ocean Hydroball bathymetric sensor, which is composed of a Tallysman TW3972 GNSS antenna, Imagenex 852 single-beam echosounder, and Honeywell HMR3000 inclinometer. The Hydroball was placed in a catamaran configuration and towed behind a small skiff at speeds below 4 knots. A total of 5 kilometers of river were surveyed, which included 10 cross-river transects. The survey was completed on June 29 and 30, 2021, from 9:30 AM to 12:30 PM, and 10:00 AM to 11:30 AM AKDT, respectively. During the survey the operator started and stopped collection only once each day. The weather throughout the survey was fair with scattered clouds, no rain, with wind from the southwest. Waves on the river were calm in shallow areas in the lee of the wind (near the eastern bank), however, waves were noted to reach 0.3-0.6 m in the main channel. No abnormalities were observed during collection. Process_Date: 20210630 Process_Step: Process_Description: Ground survey - DGGS set up a GNSS base station using the Trimble R10 receiver sampling at 1 Hz. The base was installed over a temporary benchmark of unknown position. This provided real-time kinematic (RTK) corrections to the Trimble R8s GNSS receiver (ground rover). DGGS measured the height of a water level sensor with the R8s at installation. The corrected base position was later derived using the Online Positioning User Service (found at http://www.ngs.noaa.gov/OPUS/). The R8s position was updated using post-processing kinematic (PPK) corrections in Trimble Business Center. Process_Date: 20210630 Process_Step: Process_Description: Water level survey - Solinst Levelogger and Barologger pressure transducers were installed at Napakiak during the bathymetric survey to provide water level corrections. Both the Levelogger and Barologger were configured to collect at 15-minute intervals. The Levelogger was installed in a plastic bucket stilling well and placed on the seafloor of Johnson Slough near the entrance of the Kuskokwim River (fig. 3). The Barologger was placed in open air for the duration of the survey. Data were extracted from both Levelogger and Barologger using Solinst Levelogger 5 Series software and exported as .csv files. Matching of the collection time, as well as a barometric compensation of the water surface, were completed in Matlab. A linear interpolation was applied to the Barologger data to match the Levelogger time series and a multiplying correction was used to convert 1 kPa to 0.101972 m depth (provided by the Solinst manufacturer). The corrected water level time series was converted to coordinated universal time (UTC) and exported as a .tid file for ingestion in DepthStar. Process_Date: 20210630 Process_Step: Process_Description: Bathymetric survey data processing - The Hydroball produces three files for export: .dev, .bin, and 0.852, which are directly imported into CIDCO DepthStar software. Processing steps are to input survey settings, upload .dev and .tid files, filter depth returns based on minimum depth and moving average thresholds, manually add and remove points based on visual quality, georeference the hydroball position, and export as .txt. Since the catamaran configuration was used during the survey, a draft correction 0.115 m and a GNSS antenna position reference point to echo sounder acoustic center correction of 0.364 m were applied. The minimum depth (sonar threshold) was set at 0.7 m and moving average threshold at 0.5 m. Data were georeferenced using the water level reference survey (WLRS) sounding reduction method with a sound velocity of 1450 m/s, which is the value used for fresh water. The position source was kept raw. Process_Date: 2021 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 4 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -159 Latitude_of_Projection_Origin: 0 False_Easting: 500000.000000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .00000001 Ordinate_Resolution: .00000001 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101000025 Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: NAVD88, GEOID12B Depth_Resolution: 0.001 Depth_Distance_Units: meters Depth_Encoding_Method: Attribute values Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: rdf2021-15-hydro-soundings.txt Entity_Type_Definition: single-beam bathymetric survey soundings Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: hydro-soundings Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: RDF 2021-15 Distribution_Liability: 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. Standard_Order_Process: Non-digital_Form: 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. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: table Format_Version_Date: 20211214 Format_Information_Content: tabular data Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/30765 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20220104 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: 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. Metadata_Extensions: Online_Linkage: https://dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions