OPR-R355-KR-20Herendeen BayNorth Side Alaska PeninsulaeTracH133771Herendeen BayAlaskaUnited States400002020David NeffBasic Hydrographic Survey2020-05-112020-06-142020-08-12Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersUTCPacific Hydrographic BranchAll times are UTC. The purpose of this survey is to update existing NOS nautical charts. H13377 covers approximately 28 square nautical miles in Herendeen Bay, Alaska. Any revisions to the Descriptive Report (DR) applied during office processing are shown in red italic text. The DR is maintained as a field unit product, therefore all information and recommendations within this report are considered preliminary unless otherwise noted. The final disposition of survey data is represented in the NOAA nautical chart products. All pertinent records for this survey are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/. Products created during office processing were generated in NAD83 UTM 4N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.ContractoreTrac conducted hydrographic survey operations in the Herendeen Bay, Alaska. H13377 covers approximately 28 square nautical miles of survey area. 1,447 linear nautical miles were acquired during the survey. H13377 is located in the Herendeen Bay, Alaska. Survey was conducted within these limits between June 14, 2020 (DN166) and August 12, 2020 (DN225).55.898524160.89125855.673526160.782479Survey Limits Overview (light blue area) file:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurveyLimitsOverview.pngSurvey Limits (black line)file:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurveyLimits.pngAll data were acquired in accordance with the requirements in the Project Instructions and specifications set forth in the Hydrographic Survey Specifications and Deliverables 2020 Edition (HSSD 2020). The purpose of this survey is to update existing National Ocean Service (NOS) nautical charts. The entire survey is adequate to supersede previous data.Survey H13377 is accurate to International Hydrographic Organization (IHO) Order 1a as required per the HSSD 2020.All waters in survey areaComplete 5795 LNM. Transit mileage, system calibration mileage and data which do not meet HSSD specifications shall not count towards the completion of the LNM requiremnt. Notify the COR/Project Manager upon nearing completion of LNM requirement. The final survey area shll be squared off and ensure the full investigation of any features within the surveyed extent. Sheet 1 through Sheet 4 greater than 5 meters water depth Complete Coverage Sheet 1 through Sheet 4 shoaler than 5 meters water depth Set Line Spacing MBES at 400-meter, perpendicular to contours. Complete Coverage on all features. Survey coverage was in accordance with the requirements listed above and in the HSSD. Note: Survey coverage did not extend to the entire assigned survey boundary as the Navigable Area Limit Line (NALL) was reached. In some instances the NALL was not 100% met due to safety. Survey Coveragefile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurveyCoverage.PNGSurvey Coverage with 3.5m and 5m NALL displayedfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurveyCoverage_NALL.PNGR/V 5050452.020000038.910R/V Rapid0398.090000000R/V Spectrum0539.190000018.30001389.300000057.2104.125000282020-06-142020-06-152020-06-162020-06-172020-06-182020-06-202020-06-212020-06-222020-06-242020-06-252020-06-262020-06-272020-06-282020-07-012020-07-022020-07-032020-07-042020-07-052020-07-072020-07-082020-07-102020-07-112020-07-122020-07-132020-07-142020-07-192020-07-202020-07-212020-07-222020-07-252020-07-262020-07-282020-07-292020-07-302020-07-312020-08-012020-08-062020-08-072020-08-082020-08-092020-08-102020-08-12Refer to the Data Acquisition and Processing Report (DAPR) for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods. Additional information to supplement sounding and survey data, and any deviations from the DAPR are discussed in the following sections.R/V 505100.6R/V Rapid8.50.6R/V Spectrum6.70.6The R/V 505 is a 10 meter aluminum catamaran equipped with a Universal Sonar Mount (USM) starboard multibeam pole mount. The R/V Rapid is a 8.5 meter aluminum monohull equipped with both a Universal Sonar Mount (USM) starboard and port multibeam pole mount. The R/V Spectrum is a 6.7 meter aluminum monohull equipped with a Universal Sonar Mount (USM) starboard multibeam pole mount.R2Sonic2022MBESR2Sonic2024MBESAML OceanographicBaseX2Sound Speed SystemAML OceanographicMicroX SVSound Speed SystemAML OceanographicSmartXSound Speed SystemR2SonicI2NSPositioning and Attitude SystemNote: R/V 505 utilized a dualhead R2Sonic 2022 multibeam echosounder system, an AML Base.X2 for the sound speed system, an AML Micro.X for the surface sound speed system, an AML Smart.X as a spare for the sound speed system, and a R2Sonic I2NS for the positioning system. R/V Rapid utilized a dualhead R2Sonic 2024 multibeam echosounder system, an AML Base.X2 for the sound speed system, an AML Micro.X for the surface sound speed system, an AML Smart.X as a spare for the sound speed system, and a R2Sonic I2NS for the positioning system. R/V Spectrum utilized a R2Sonic 2024 multibeam echosounder system, an AML Base.X2 for the sound speed system, an AML Micro.X for the surface sound speed system, and a R2Sonic I2NS for the positioning system.A beam-to-beam statistical analysis was performed using the Cross Check tool in Qimera. A 1 meter Combined Uncertainty and Bathymetric Estimator (CUBE) weighted dynamic surface was created incorporating only the mainscheme lines and excluded crosslines. The Cross Check tool was used to perform the beam-by-beam comparison of the crossline data to the mainscheme surface. Comparisons showed excellent agreement, well above 95% of the allowable TVU. Note: This surface was created for QC only and is not submitted as a surface deliverable. The beam-to-beam crossline comparison report generated through the Qimera Cross Check tool is included in Separates II. Below is a histogram of the crossline comparison statistics showing IHO Order 1a compliance per beam.H13377 Crossline Comparisonfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Crosscheck_Histogram.pngERS via ERTDM0.22R/V 5050.050.2R/V Rapid0.050.2R/V Spectrum0.050.2Standard deviation and uncertainty layers of the Dynamic Surface were utilized during data processing to search for features, water column noise, and systematic errors. IHO Order 1a uncertainty specification was met by 100% of the nodes. The final Bathymetric Attributed Grid (BAG) surface's uncertainty was generated through the NOAA QC Tools and an image of the results is located below. For H13377 the following percentages represent the results of the TPU calculation: Complete Coverage MBES (Finalized 1m CUBE weighted Dynamic Surface in NOAA QC Tools) = 99.5+% of nodes are within the allowable TVU. Complete Coverage MBES (Finalized 2m CUBE weighted Dynamic Surface in NOAA QC Tools) = 99% of nodes are within the allowable TVU. Complete Coverage MBES (Finalized 4m CUBE weighted Dynamic Surface in NOAA QC Tools) = 99.5+% of nodes are within the allowable TVU. Complete Coverage MBES (Finalized 8m CUBE weighted Dynamic Surface in NOAA QC Tools) = 100% of nodes are within the allowable TVU. H13377 Finalized 1m Complete Coverage MBES TVU Statisticsfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_1m_TPUResults.pngH13377 Finalized 2m Complete Coverage MBES TVU Statisticsfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_2m_TPUResults.pngH13377 Finalized 4m Complete Coverage MBES TVU Statisticsfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_4m_TPUResults.pngH13377 Finalized 8m Complete Coverage MBES TVU Statisticsfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_8m_TPUResults.pngDepth differences between junctioning surveys were evaluated using the JunctionTrac program, developed in-house by eTrac. For each junction, each CUBE weighted dynamic surface's nodes were exported to an ASCII CSV file where the fields were (Easting, Northing, Depth) for each node. A 1 meter difference surface between the junctioning datasets was also created and exported to an ASCII CSV file where the fields were (Easting, Northing, Diff) for each node. The three ASCII CSV files were then loaded into the JunctionTrac program and junction statistics were computed. A file was also created in this process to locate any nodes from the difference surface that exceed the allowable TVU, which was imported into Qimera and any identified points from JunctionTrac were analyzed. Note: the difference surfaces were created for comparison efforts only and are not submitted as surface deliverables.H13378400002020eTracNEThe junction comparison was performed using all overlapping data between H13377 and H13378. Below is a histogram of junction comparison statistics showing the difference between the junctioning surfaces and allowable TVU as well as difference statistics. 99.5899% of nodes were within allowable TVU. H13377 - H13378 Junction Comparisonfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_H13378_JunctionTrac.PNGH13377 - H13378 Difference Statisticsfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_H13378_DiffTrac.PNGSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.None ExistThere were no other factors that affected corrections to soundings.SVP casts were generally taken every 2 hours. Occasionally casts would exceed a 2 hour frequency, however would never exceed a 4 hour frequency. On R/V 505, R/V Rapid, and R/V Spectrum casts were applied in QPS Qinsy acquisition software at the time of the cast. Surface SVP measured at 1Hz was compared to surface speed from the current profile in realtime. If the surface velocity comparison was in excess of 2m/s at any time during survey operations, a new cast was taken. Surface sound speeds were compared in realtime and profile to profile for each cast on the vessel. Additionally, the processor reviewed profiles in Qimera to remove spurious readings within a cast, compare day-to-day casts, and to check distribution over the surveyed area, in order to better understand trends for efficient acquisition planning.All equipment and survey methods were used as detailed in the DAPR.Data Density EvaluationIn order to determine if the density of the data met the specified 5 soundings per node, data density was evaluated using DensityTrac in the AmiTrac program, developed in-house by eTrac. Each finalized CUBE weighted dynamic surface's nodes were exported to a BBH file. The BBH file was then loaded into the DensityTrac program and density statistics were computed. For H13377 the following percentages represent the results of the density query: Complete Coverage MBES (Finalized 1m CUBE weighted Dynamic Surface ) = 99.8914% of nodes are composed from at least 5 soundings. ­­­­ Complete Coverage MBES (Finalized 2m CUBE weighted Dynamic Surface ) = 99.9866% of nodes are composed from at least 5 soundings. Complete Coverage MBES (Finalized 4m CUBE weighted Dynamic Surface ) = 99.9993% of nodes are composed from at least 5 soundings. Complete Coverage MBES (Finalized 8m CUBE weighted Dynamic Surface ) = 100% of nodes are composed from at least 5 soundings.H13377 Finalized 1m Complete Coverage MBES Density Distributionfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Density_1m_Results.PNGH13377 Finalized 2m Complete Coverage MBES Density Distributionfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Density_2m_Results.PNGH13377 Finalized 4m Complete Coverage MBES Density Distributionfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Density_4m_Results.PNGH13377 Finalized 8m Complete Coverage MBES Density Distributionfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Density_8m_Results.PNGAll data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Backscatter data were collected throughout the survey and are retained in the raw ALL and DB files. Every effort was made in the field to collect quality backscatter data while maintaining the primary mandate of high quality bathymetric data. While no processing or analysis of backscatter was required, eTrac verified coverage and general quality of the backscatter data collected. A beam intensity window was monitored in Qinsy during acquisition to ensure backscatter data collection. Raw backscatter data were viewed in QPS FMGeocoder to further confirm collection criteria had been met. Shown below is an example of the unprocessed backscatter mosaic from H13377 DN184 (R/V Spectrum).Raw Backscatter from R/V Spectrum (DN184)file:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Backscatter_DN184_SP.PNGNOAA Profile Version 2020Feature Object Catalog, NOAA Profile Version 2020 was used only in CARIS. Qimera was used as the primary processing software, which included feature management. H13377_MB_1m_MLLW_FinalBAG10.8820NOAA_1mComplete MBESH13377_MB_2m_MLLW_FinalBAG21840NOAA_2mComplete MBESH13377_MB_4m_MLLW_FinalBAG43680NOAA_4mComplete MBESH13377_MB_8m_MLLW_FinalBAG872106.81NOAA_8mComplete MBESA 1m, 2m, 4m and 8m surface are provided meeting complete coverage MBES with backscatter specifications for H13377. A parent surface of the 1m surface is also provided in the Surfaces_Mosaics Folder in this delivery drive package.H13377 Finalized 1m CUBE weighted Dynamic Surface Coveragefile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurfaceCoverage_1m.PNGH13377 Finalized 2m CUBE weighted Dynamic Surface Coveragefile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurfaceCoverage_2m.PNGH13377 Finalized 4m CUBE weighted Dynamic Surface Coveragefile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurfaceCoverage_4m.PNGH13377 Finalized 8m CUBE weighted Dynamic Surface Coveragefile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SurfaceCoverage_8m.PNGAdditional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterERS via VDATUMOPR-R355-KR-20_ERTDM_WGS84-MLLW_04142020.qgfvomIn order to reference soundings to Mean Low Low Water Datum, a VDatum separation model was applied to the Qinsy DB files via a separation file in the acquisition software. North American Datum 1983Projected UTM 4RTXApplanix PosPac MMS was utilized to post process realtime positioning data utilizing Trimble's PP-RTX implementation of Trimble CenterPoint RTX to create a Smoothed Best Estimate of Trajectory (SBET).GNSS satellite corrections were received on each vessel using the G2+ carrier signal from the Marinestar Global Correction System maintained by Fugro. A chart comparison was conducted for H13377 using Qimera and CARIS HIPS and SIPS. Survey data were compared against the largest scale ENC to accomplish the chart comparison. Details of the ENC used are listed below. US4AK5GM, scale: 80000, edition: 6.2, update application date: 12/27/2017, issue date: 07/24/2020 The results of the chart comparison are listed below. Shoal and Hazardous Features: Throughout survey operations sounding comparisons between the charted depths and the surveyed depths were analyzed to identify depth discrepancies. Using the 1 meter CUBE weighted Dynamic surface, soundings were generated in CARIS HIPS and SIPS. Soundings were displayed against the charted soundings and a visual comparison was made. An example image of the generated soundings overlaid on the chart is included below. From this methodology, six DtoNs were submitted for this survey. The DtoNs were regions where the surveyed data were significantly shoaler than the charted soundings. Charted Features: For features that were addressed, the surveyed features generally agreed with the charted features. Additional details can be found in the FFF. Uncharted Features: There were no additional uncharted features. Channels: There were no charted maintained channels within the survey boundary. Johnston Channel is not a maintained channel and does not have a controlled depth.Generated Soundings used for Chart Comparisonfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SoundingComparison.pngGenerated Soundings Submitted as Dangers (example 1)file:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Soundings_DtoNs_1.pngGenerated Soundings Submitted as Dangers (example 2)file:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_Soundings_DtoNs_2.pngUS4AK5GM8000062017-12-272020-07-24There were 6 DtoNs found in H13377 and added to the Final Feature File (FFF). Each feature in the FFF has been given a unique identifier in the "userid" field of the .000 S-57 file (format 77XXX). Refer to the FFF for determinations and recommendations of each feature. The DtoNs were submitted in the following Danger to navigation report: H13377_DtoNAll submitted DTONs have been already applied to the latest chartsThere were 42 charted features assigned to H13377. The assigned features are retained in the Final Feature File (FFF). Each feature in the FFF has been given a unique identifier in the "userid" field of the .000 S-57 file (format 77XXX). Refer to the FFF for determinations and recommendations of each feature.No new features were found in H13377. Note: DtoNs are not included in the number of new features in this section. DtoNs can be found separately in section D.1.2 No maintained channels exist for this survey. There are no designated anchorages, precautionary areas, safety fairways, traffic separation schemes, pilot boarding areas, or channel and range lines within the survey limits.No Aids to navigation (ATONs) exist for this survey.No Maritime Boundary Points were assigned for this survey.5 bottom samples were obtained in accordance with section 7.1 of the HSSD 2020 in areas designated by the field through discussions with our COR. Detailed information and images of the bottom samples are located in the Final Feature FIle (FFF). Each bottom sample has been given a unique identifier in the "userid" field of the .000 S-57 file (format AX).No overhead features exist for this survey.No submarine features exist for this survey.No platforms exist for this survey.No ferry routes or terminals exist for this survey.Dynamic sandwaves and sediment movement was observed in H13377. Note: In some instances, flier finder occasionally flags areas where sediment movement was observed. Examples of the observed movement are shown in the image below. Dynamic Sediment Movementfile:///M:/OPRR355KR20/Surveys/H13377/Office_Processing/Reports_office/Components/SupportFiles/H13377_SedimentChange.PNGNo present or planned construction or dredging exist within the survey limits.No new surveys or further investigations are recommended for this area.No new ENC scales are recommended for this area.As 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 Descriptive 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 Specifications and Deliverables, Field Procedures Manual, Letter Instructions, and all HSD Technical Directives. These data are adequate to supersede charted data in their common areas. This survey is complete and no additional work is required with the exception of deficiencies noted in the Descriptive Report.David NeffChief of Party2020-10-20