OPR-R365-FA-17D00226AlaskaBering Strait and VicinityBering Strait40000KongsbergEM710MULTIBEAM ECHO SOUNDERKongsbergEM2040MULTIBEAM ECHO SOUNDERNorth American Datum of 1983 (NAD83)Mean Lower Low WaterTCARIUTM Zone 03NNOAA Ship FAIRWEATHER2017-07-112017-09-04CDR Mark Van Waes, NOAA2017-12-20This hydrographic survey was acquired in accordance with the requirements defined in the Project Instructions for OPR-R365-FA-17, and the NOS Hydrographic Surveys Specifications and Deliverables Manual (HSSD), April 2017. Data for D00226 were obtained opportunistically while the Fairweather was operating in Port Clarence, AK. Data were acquired via 500 meter set line spacing, as per the Project Instructions.66.6119766944168.32030191761.4516568056167.611657111Figure 1: D00226 Survey overviewfile:///M:/OPRR365FA17/Surveys/D00226/Compilation/Report/Components/SupportFiles/D00226_WorkingMap.jpgBased on AIS data, the Bering Strait Corridor is the most heavily trafficked route for local vessels transiting in the area. This survey aims to provide contemporary bathymetric data to promote safe and secure transit throughout this corridor.The entire survey is adequate to supersede previous data.Data from this survey is intended to supersede all prior survey data in the common area.Please reference OPR-R365-FA-17 Data Acquisition and Processing Report for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods. One exception to the standard processing workflow employed by the Fairweather was that due to high uncertainty in the outer beams attributed primarily to the sonar angle, all data were filtered to a swath of 60 degrees on both the port and starboard. This allowed the data in this survey to meet NOAA specifications for allowable uncertainty.To determine NOAA Allowable Uncertainty statistics, a 4 meter resolution surface generated from the data was entered into the Grid QA function in PydroXL. It was found that more than 99% of nodes meet NOAA allowable uncertainty specifications survey D00226.US3AK83M30000082015-08-262015-08-26falseUS3AK80M40000082017-04-172017-04-17falseUS4AK81M100000122016-04-272016-04-27falseUS4AK98M9000012015-11-092015-11-09falseUS5AK82M2000052017-03-082017-03-08falseUS2AK92M700000132017-10-032017-08-31falseUS2AK95M153407672017-08-032017-08-03falseUS3AK89M31535082017-10-032017-05-30falseUS4AK8DM10000062017-10-032017-05-30falseTo compare charted soundings with surveyed data, the Zonal Statistics tool was utilized in ArcMap 10.5. Soundings from the ENC were extracted, buffered with a radius of 250 meters and compared to the surveyed data. In general, soundings from D00226 are in agreement with charted depths throughout the survey area. The mean difference between charted soundings and surveyed soundings is -0.13 fathoms, with a standard deviation of +/- 0.79 fathoms. An example of an area where the depth discrepancy between charted and surveyed soundings exceeds 2 fathoms is shown in Figure 3 belowFigure 3: Discrepancy between D00226 data and ENC US4AK81Mfile:///M:/OPRR365FA17/Surveys/D00226/Compilation/Report/Components/SupportFiles/D00226_WorkingMap2.jpgD00226_MB_4m_MLLW.csarCUBE42.362.6NOAA 4mTracklineD00226_MB_4m_MLLW_Final.csarCUBE42.362.6NOAA 4mTracklineTCARIVillage Cove, AK9464212Nome, AK9468756Red Dog Dock, AK9491094A request for final tides was submitted on September 8, 2017.During real-time acquisition, S220 and launches 2806 and 2807 received correctors from the Wide Area Augmentation System (WAAS) for increased accuracies similar to USCG DGPS stations. WAAS was the sole method of positioning for survey D00226.Fairweather utilized the AML Oceanographic MVP 200 system and SeaBird 19plus CTD for the acquisition of sound velocity casts. Casts were conducted ever 2-10 hours during acquisition, with an average interval of 4 hours. Sound velocity profiles were sent to the Kongsberg Seafloor Information System (SIS) through Pydro Velocipy after each cast. Holidays Holidays exist in the delivered data due to the transit trackline acquisition technique of this survey. One exceptional holiday was created when the EM710 lost bottom tracking, and the data had to be rejected. See Figures 4 and 5 below. Figure 4: Rejected data due to loss of bottom trackingfile:///M:/OPRR365FA17/Surveys/D00226/Compilation/Report/Components/SupportFiles/Capture10.PNGFigure 5: 3D view of rejected data due to loss of bottom trackingfile:///M:/OPRR365FA17/Surveys/D00226/Compilation/Report/Components/SupportFiles/Capture12.pngAs Chief of Party, field operations for this hydrographic survey were conducted under my direct supervision, with frequent personal checks of progress and adequacy. I have reviewed the attached survey data and reports.All field sheets, this Survey Summary Report, and all accompanying records and data are approved. All records are forwarded for final review and processing to the Processing Branch.The survey data meets or exceeds requirements as set forth in the NOS Hydrographic Surveys and Specifications Deliverables, Field Procedures Manual, Standing and Letter Instructions, and all HSD Technical Directives. These data are adequate to supersede charted data in their common areas. CDR Mark Van Waes, NOAAChief of Party2018-03-26LT Damian Manda, NOAAField Operations Officer2018-03-26HCST Sam CandioChief Survey Technician2018-03-26HAST Dmitry MalinkinSheet Manager2018-03-26