Metadata: Identification_Information: Citation: Citation_Information: Originator: Richard M. Buzard Originator: Anita C. Engelstad Originator: Alexander L. Nereson Publication_Date: 20250708 Title: Nearshore bathymetry of the Koyuk River mouth, Alaska, 2024 Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI: 10.5066/P13BXTXV Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: Geological Survey Online_Linkage: https://doi.org/10.5066/P13YIWKC Larger_Work_Citation: Citation_Information: Originator: Li Erikson Originator: Ann E. Gibbs Originator: Richard M. Buzard Originator: Daniel J. Nowacki Originator: Alexander G. Snyder Originator: Anita C. Engelstad Originator: Cordell Johnson Originator: Alexander L. Nereson Originator: Jin-Si R. Over Originator: Paul Russel Originator: Colin Lyons Publication_Date: 2025 Title: In situ field data, Coastal Alaska, 2023 to 2025 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P13YIWKC Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: Geological Survey Other_Citation_Details: Suggested Citation: Erikson L.H., Gibbs A.E., Buzard R.M., Nowacki D.J., Snyder A.G., Engelstad A.C., Johnson C., Nereson A.L., Over J.R., Russel, P., Lyons, C., 2025, In situ field data, Coastal Alaska, 2023 to 2025: U.S. Geological Survey data release, https://doi.org/10.5066/P13YIWKC Online_Linkage: https://doi.org/10.5066/P13YIWKC Description: Abstract: This dataset contains nearshore bathymetry measurements collected at the mouth of the Koyuk River in Alaska. The data were collected in June 2024 and subsequently processed by the U.S. Geological Survey, Pacific Coastal and Marine Science Center. Results are provided in a comma-separated value format (csv). Purpose: This product was created to advance coastal storm response and recovery in Alaskan coastal communities in the wake of the September 2022 extratropical Typhoon Merbok disaster. It is being used by the USGS to support the development of dynamic flood models for more than 20 communities along the northwest coasts of Alaska. This product is intended for reuse by scientists, managers, and the general public. These data can be opened with any text viewer, spreadsheet editor, or geographic information systems (GIS) software for review, visualization, and analysis purposes. Supplemental_Information: Work was funded by Title VII of Division N in the Consolidated Appropriations Act, 2023 (Public Law 117–328) to support direct recovery and rebuilding decisions in the wake of declared disasters related to hurricanes and typhoons in 2022. For more information on these efforts, see https://www.usgs.gov/supplemental-appropriations-for-disaster-recovery-activities/typhoon-merbok-coastal-community. Additional information about the field activity or activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2024-634-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, this metadata file may include some vendor-specific terminology. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20240609 Currentness_Reference: ground condition at the time source data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -161.29880 East_Bounding_Coordinate: -161.02413 North_Bounding_Coordinate: 64.93214 South_Bounding_Coordinate: 64.83365 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:8ec35e50-a737-42f7-81fc-77064b533124 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: bathymetry Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Theme_Keyword: coast Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme: Theme_Keyword_Thesaurus: Geographic Names Information System (GNIS) Theme_Keyword: State of Alaska Theme_Keyword: Nome Census Area Theme_Keyword: City of Koyuk Theme_Keyword: Koyuk River Theme_Keyword: Norton Bay Access_Constraints: No access constraints Use_Constraints: USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: koyuk_bathy_2024_browse.png Browse_Graphic_File_Description: Satellite image overlain with bathymetry data points collected at the mouth of the Koyuk River, Alaska in June 2024. Browse_Graphic_File_Type: PNG Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted. Logical_Consistency_Report: All data falls within expected ranges. Completeness_Report: Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The mean estimated horizontal accuracy of these points is 1.78 meters. Horizontal accuracy for each point measurement was estimated by summing in quadrature the following values: 1) the horizontal precision for each point (calculated at the 95 percent confidence level by the post-processing software). Max value was 0.02 m. 2) The horizontal accuracy of the NGS OPUS-derived position of the GNSS base station operating on benchmark PID BBFB41at the 95 percent confidence level (0.02 m). And 3) the horizontal offset of the transducer from the R10-2 mounted on the steering console of the aluminum fishing vessel (1.78 m). The offset of the rover from the transducer dominates the horizontal positional uncertainties. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The mean estimated vertical accuracy of these points is 0.36 meters. Vertical accuracy for each point measurement was estimated by summing in quadrature the following values: 1) the vertical precision for each point (calculated at the 95 percent confidence level by the post-processing software). 2) The vertical accuracy of the NGS OPUS-derived position of the GNSS base station operating on benchmark PID BBFB41at the 95 percent confidence level (0.354 m). 3) The measurement resolution of the fishfinder (0.1 ft / 0.03 m). And 4) The error on the vertical offset of the of the transducer from the R10-2 mounted on the steering console of the aluminum fishing vessel (0.03 m). The vertical accuracy of the NGS OPUS-derived position of the GNSS base station dominates the vertical positional uncertainties due to the large error of GEOID12B in the region. Vertical accuracy was also assessed in two other ways: 1) In the field using two lead line depth measurements in approximately six and 12 feet of water depth, respectively. Both lead line measurements were within 0.1 ft (0.03 m) of the value measured by the transducer and read from the fishfinder. 2) The z values of point pairs in close horizontal proximity were compared to one another after post-processing. Among the three point pairs that were within 5 meters of each other, the z values of each pair member were within 0.10 m of each other. Among the 23 point pairs that were within 15 meters of one another, the z values of each pair member were within 0.80 m; and 22 of them were within 0.30 m. Lineage: Process_Step: Process_Description: Global navigation satellite system (GNSS) data set up: 1) We set up a GNSS base station (Trimble R10-2) on benchmark PID BBFB41 for the duration of the bathymetry survey, collecting at 1 hz for 9:53 hours. 2) Affix a Trimble R10-2 rover on a 2.00 m rod to the steering console of a small aluminum fishing vessel and set rover to collect waypoints continuously at 1hz while the bathymetry collection vessel is underway. Process_Date: 20240609 Process_Step: Process_Description: Bathymetry data collection: 1) Launch small aluminum fishing vessel at the time of approximate local mean higher high water (1.744 m NAVD88, per Alaska Tidal Datum Portal, https://dggs.alaska.gov/hazards/coastal/ak-tidal-datum-portal.html). 2) Record instantaneous depth measurements from an aluminum vessel fitted with a transom-mounted Garmin GT20-TM transducer operating at 200 khz with a 15-degree, cone-shaped beam. 3) Read depth measurements from the screen of a Garmin Striker-series fishfinder at variable time intervals (10 s to 10 min) from while traveling less than or equal to 3.5 m/s (8mph) on smooth seas (approximately 1ft wave height). 4)Handwrite values in a field notebook along with the concurrent waypoint ID from the continuously-logging R10-2 rover. 5) After bathymetry survey, use the rover measure benchmark PID BBFB41 for control. Process_Date: 20240609 Process_Step: Process_Description: Global navigation satellite system (GNSS) data processing: 1) Base station GNSS rinex files were uploaded to the Online Positioning User Service (OPUS)to obtain an accurate benchmark coordinate for post-processing of the rover data. 2) Positioning data from the survey platforms were post-processed to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983 (2011 realization). Post-processing of raw GNSS data was performed with Trimble Business Center. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey GEOID12B offsets. The final point coordinate data from the topographic surveyors are calculated and reported in the following projected and geographic coordinates: NAD83(2011) / UTM zone 4N (EPSG: 6333) and WGS 84 (EPSG: 4326). Process_Date: 20240610 Process_Step: Process_Description: Combine GNSS positions with bathymetry measurements: Subtract depth measurements from orthometric heights measured on board the aluminum fishing vessel to calculate bottom elevations in meters NAVD88, GEOID12B. Process_Date: 20240807 Process_Step: Process_Description: Assess uncertainties: see Positional Accuracy report in this metadata file for more information. Process_Date: 20250602 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 856 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: 0.9996 Longitude_of_Central_Meridian: -159.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.6096 Ordinate_Resolution: 0.6096 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: NAD83_National_Spatial_Reference_System_2011 Ellipsoid_Name: GRS 1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 GEOID12B Altitude_Resolution: 0.01 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: bathymetry_koyuk_river_mouth_20240609.csv Entity_Type_Definition: Comma-separated value file Entity_Type_Definition_Source: Producer Defined Attribute: Attribute_Label: Easting_m_UTM Attribute_Definition: X coordinate (easting) in meters NAD83(2011) / UTM zone 4N (EPSG: 6333) Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 391324.37 Range_Domain_Maximum: 403981.93 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Northing_m_UTM Attribute_Definition: Y coordinate (northing) in meters NAD83(2011) / UTM zone 4N (EPSG: 6333) Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 7191882.10 Range_Domain_Maximum: 7202433.56 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Elevation_m_NAVD88 Attribute_Definition: Orthometric height (elevation) in meters NAVD88 GEOID12B Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -6.60 Range_Domain_Maximum: 1.34 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: UTM_Zone Attribute_Definition: Universal Transverse Mercator (UTM) zone Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 4N Enumerated_Domain_Value_Definition: UTM zone number Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: Longitude Attribute_Definition: Longitude in decimal degrees, WGS 1984 Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -161.291487 Range_Domain_Maximum: -161.029690 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.00001 Attribute: Attribute_Label: Latitude Attribute_Definition: Latitude in decimal degrees, WGS 1984 Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 64.834438 Range_Domain_Maximum: 64.930760 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.00001 Overview_Description: Entity_and_Attribute_Overview: These metadata describe a comma-separated value (csv) file containing bathymetry data from the Koyuk River mouth, Alaska. The first line is a header line and each subsequent line contains x and y coordinates in meters NAD83(2011) / UTM zone 4N (EPSG: 6333) and an orthometric height (elevation) in meters NAVD88 GEOID12B. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: These data are available in a comma-separated value format (csv) accompanied by CSDGM FGDC-compliant metadata. Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Comma-delimited text Format_Version_Number: Microsoft Excel (version 2408 (Build 17928.20538 Click-to-Run)) Format_Specification: text Format_Information_Content: comma-delimited text file File_Decompression_Technique: No compression applied. Transfer_Size: 0.0441 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P13YIWKC Access_Instructions: Data and metadata can be downloaded using the Network_Resource_Name link and scrolling down to the Sonar Data section. Fees: None Technical_Prerequisites: These data can be opened with any text viewer, spreadsheet editor, or geographic information systems (GIS) software. Metadata_Reference_Information: Metadata_Date: 20250708 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998