OPR-P335-FA-14South Coast of Kodiak IslandKodiak, AKNOAA Ship FairweatherH126801Alitak Bay Approach to Humpy CoveAlaskaUnited States100002014CDR. David J Zezula, NOAA.Navigable Area2014-04-212014-05-162014-06-16Multibeam Echo SounderMultibeam BackscattermetersUniversal Transverse Mercator (UTM)UTC -8Pacific Hydrographic BranchThe purpose of this survey is to provide contemporary surveys to update National Ocean Service (NOS) nautical charts. All separates are filed with the hydrographic data. Notes in red were generated during office processing. The processing branch concurs with all information and recommendations in the DR unless otherwise noted. Page numbering may be interrupted or non-sequential. All pertinent records for this survey, including the Descriptive Report, are archived at the NOAA's National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/NOAAThe survey area is located at Kodiak Island, within the sub-locality of Alitak Bay Approach to Humpy Cove. 56.9486444444154.21783888956.7434611111153.997772222Survey Limits were acquired in accordance with the requirements in the Project Instructions and the HSSD Dated April,2014.The purpose of this project is to provide contemporary surveys to update National Ocean Service (NOS) nautical charting products. The project will include areas off the South Coast of Kodiak Island, AK. This project area also addresses survey request number 030001; need for survey due to increasing number of passenger vessels, tour vessels, and large fishing fleet vessels.The entire survey is adequate to supersede previous data.The 4-meter depth contour and the mean high water inshore limit were met with the following exception: areas where vegetation (i.e., kelp) at or near the surface made it impossible to safely navigate the survey. The 4m curve was not reached at the southeast corner of the sheet due to the area being foul with rocks as seen in the image below. H12680 Sheet limit not met do to coverage fouled by rocks SupportFiles\H12680 COV green.pngSurvey Coverage was in accordance with the requirements in the Project Instructions and the HSSD.H12680 Survey Outline SupportFiles\Survey Outline Coverage Area.jpg2805070.350000021.00028060100.39000000028070100.5900000002808099.5400000000371.000000021.0505.668000022.242014-05-162014-05-172014-05-202014-05-212014-06-16Two Detached Positions (DP) were acquired as part of survey H12680.Refer 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.28058.641.1228068.641.1228078.641.1228088.641.12Reson7125MBESApplanixPOS MV V4Positionong and Attitude SystemResonSVP-71Sound Speed SystemSea-Bird ElectronicsSBE 19 PlusConductivity,Temperature,and Depth Sensor Surface differencing in CARIS HIPS and SIPS was used to assess crossline agreement with mainscheme lines. Figure 6 depicts an 8-meter surface made with mainscheme lines only and an 8-meter surface made with crosslines only. This difference surface is submitted digitally in the Separates II folder. The two surfaces agree within plus or minus 0.5 meters, therefore crosslines agree with mainscheme lines within the total allowable vertical and horizontal uncertainty in their common areas.There is notable disagreement in areas with steep slopes as seen in figure 4.H12680 Graphical representation between crossline and mainscheme surfaces.SupportFiles\H12680 Graphical representation between crossline and mainscheme surfaces.pngH12680 Disagreement between surfaces with steep slopesSupportFiles\difference surface image with cicles.png0.010.08280520.5280620.5280720.5280820.5The areas of overlap between the sheets were reviewed in CARIS Subset Editor for sounding consistency and in CARIS BathyDatabase by surface differencing 8-meter combined surfaces to assess surface agreement. The soundings and surfaces are in agreement within half a meter. The junction agreement is within the total allowable vertical and horizontal uncertainity in their common areas and depths.Junction between H12680, H12681, and H11664.SupportFiles\H12680_Junctions.jpgH12681400002014NOAA Ship FAIRWEATHERSSurface differencing in CARIS HIPS and SIPS was used to assess junction agreement between H12680_MB_8m_MLLW_Combined and H12681_MB_8m_MLLW_Combined. The difference between the surfaces were generally less than 0.5 m. See figure figures bellow for graphical representation and for statistical information of the surface differencing.Graphical representation of differences between junction H12680 and H12681.SupportFiles\H12681_H12680_Junctionimage.jpgStatistical information for junction comparison between sheet H12680 and H12681.SupportFiles\H12681_H12680_Junctionstats.jpgH11664100002007TENIX LADSESurface differencing in CARIS Bathy database was used to assess junction agreement between H12680_MB_8m_MLLW_Combined surface and H11664_LI_BASE_3m. Survey H12680 was compared to the LIDAR junction survey H11664, which was completed in 2007 by TENIX LADS. The difference at the 95 percent confidence level was +/- 1.07m, please see statistical information on the image below. The areas of greatest differences were in very rocky and dynamic sections of the surveys and also where the LIDAR coverage was very sparse.Graphical representation of differences between junction H12680 and H11664.SupportFiles\H12680_H11664_Junctionimage.jpgStatistical information for junction comparison between sheet H12680 and H11664.SupportFiles\Junction H12680_H11664.tifSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.RESON 7125 200kHz OffsetFor data collected on survey H12680, with launch 2805 200kHz on day number 136, there is an observable vertical offset, which varies with water depth as seen in the images below. This error is due to an incorrect setting in the RESON hardware configuration, specifically the mounting bracket offsets for the receiver reference point to projector reference point. The offset was observed while reviewing reference surface data collected following acquisition of this project (see figures 8 and 9). The "Z" value in the 2805 200kHz HVF (Transducer 1) was modified to account for the difference imposed by the incorrect setting, which resolved this vertical offset; the value was modified to 0.540 meters from 0.482 meters as shown in Figure 7.FA 2805 200kHz HVF Z-axis Offset adjustment.SupportFiles\RESON_offset_2805_200khz HVF.jpgH12680 2805 200kHz Offset 3D View.SupportFiles\RESON_offset_2805_200khz.jpgH12680 2805 200kHz Offset 2D View.SupportFiles\RESON_offset_2805_200khz 2D.jpgThe offset described in section B.2.5 was reduced by adjusting the z-value in the HIPS Vessel File. While a change to a static offset value may not entirely eliminate an offset that varies with depth, data were reviewed at the Pacific Hydrographic Branch and are adequate to supersede previous data.None ExistThere were no other factors that affected corrections to soundings.Casts were conducted at a minimum of at least every four hours during launch acquisition.Casts were conducted more often in areas where the input of freshwater had an effect on the speed of sound in the water column and when there was a change in surface sound velocity greater than two meters per second.All equipment and survey methods were used as detailed in the DAPR.IHO uncertainity All data meet the data accuracy specifications as stated in the NOS Hydrographic Surveys Specifications and Deliverables (HSSD) dated April 2014. It was found that 100% of nodes in the 1-meter, 2-meter, 4-meter, and 8-meter grids meet or exceed IHO Order 1 specifications for all depths of survey H12680, see Standards Compliance Review in Appendix II. To assess vertical accuracy standards, a child layer titled “IHO_1” was created for each of the 1-meter, 2-meter, 4-meter, and 8-meter (72-100m) and "IHO_2" for the 8-meter (100-160m) finalized surfaces using the equations stated in section C. 2.1 of the DAPR. H12680 IHO Uncertainty Layer.SupportFiles\H12680 IHO_.pngH12680 Density Density requirements for H12680 were achieved with at least 99.92% of finalized surface nodes containing five or more soundings, see Standards Compliance Review in Appendix II.Holiday AssessmentComplete coverage, per coverage requirements described in the project instructions, was obtained within the limits of H12680. The least depths of all navigationally significant features are represented by H12680, however some holidays do exist and examples are described below. Acoustic shadowing prevented full coverage on downslope areas of a few rocky outcrops. Most holidays of this nature were near or outside the survey sheet limit. Examples of these holidays are shown in figures 14 and 15. Holidays exist where multibeam coverage did not cover the top of a rock. These holidays were found after the project area was departed, leaving no opportunity for further development. Several of this type of holiday exist outside the near shore sheet limit. Examples are shown in figure 16 and 17 below. Other examples of this exist at: 56:46:47.22N, 154:07:52.83W 56:46:12.81N, 154:08:14.50W 56:46:24.05N, 154:08:13.74W 56:46:54.18N, 154:07:47.91W 56:47:01.76N, 154:07:44.01W Holidays exist where multibeam coverage was not obtained on the top of rock in the vicinity of other larger rocks. The large rocks in proximity made it unsafe to survey the holidays. These figures are shown in figure 18 and 19. Throughout the survey there were several small holidays that could not be surveyed due to departure of the survey area. These holidays had the backscatter from the surrounding area examined to confirm that no features were present. These holidays are shown in figures 20 and 21.Acoustic shadow holiday example 1 (56:45:21.77N, 154:08:42.61W)SupportFiles\accoustic shadow1.pngAcoustic shadow holiday example 2 (56:47:38.22N, 154:07:03.67W)SupportFiles\accoustic shadow3.pngMissing rock high point example 1 (56:46:47.22N, 154:07:52.83W)SupportFiles\missing top rock3.pngMissing rock high point example 2 (56:47:42.45N, 154:06:56.68W)SupportFiles\missing top rock2.pngMissing rock high point near shoal feature (56:49:52.14N, 154:05:22.69W)SupportFiles\missing top rock shoal spot1.pngMissing rock high point near shoal feature (56:46:54.18N, 154:07:47.91W)SupportFiles\missing top rock near shoal spot2.pngGeneral holiday example 1 (56:52:13.32N, 154:04:19.94W)SupportFiles\holiday1.pngGeneral holiday example 2 (56:44:48.47N, 154:09:07.69W)SupportFiles\holiday2.pngThe data gap shown in Figure 20 spans only 3 grid nodes and is not considered a 'holiday' under current Specifications.All data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Backscatter was logged in 7k files and submitted directly to NGDC to be archived and to PHB where the data will be processed. One line per vessel per day of Backscatter was processed by the field unit.NOAA Extended Attribute Files V5.3.2Due to an error in CARIS HIPS version 8.1.8 that causes TPU to be recomputed incorrectly, HIPS was reverted to 8.1.7 for Survey H12680. TPU and all surfaces were re-computed and the IHO uncertainty statistics was re-evaluated.H12680_MB_1m_MLLWCUBE1NOAA_1mComplete MBESH12680_MB_2m_MLLWCUBE2NOAA_2mComplete MBESH1260_MB_4m_MLLWCUBE4NOAA_4mComplete MBESH12680_MB_8m_MLLW_CUBE8NOAA_8mComplete MBESH12680_MB_1m_MLLW_FinalCUBE1020NOAA_1mComplete MBESH12680_MB_2m_MLLW_FinalCUBE21840NOAA_2mComplete MBESH12680_MB_4m_MLLW_FinalCUBE43680NOAA_4mComplete MBESH12680_MB_8m_MLLW_FinalCUBE872160NOAA_8mComplete MBESH12680_MB_8m_Combined_MLLW_FinalCUBE8NOAA_8mComplete MBESThe NOAA CUBE parameters mandated in HSSD were used for the creation of all CUBE BASE surfaces in Survey H12680.The surfaces have been reviewed where noisy data, or ‘fliers’ are incorporated into the gridded solution causing the surface to be shoaler or deeper than the true seafloor. Where these spurious soundings cause the gridded surface to be shoaler or deeper than the reliably measured seabed by greater than the maximum allowable TVU at that depth, the noisy data have been rejected and the surface recomputed.As delivered from the field hydrographer, surface H12680_MB_4m_MLLW_Final had a depth range of 38 to 80 meters. H12680_MB_8m_MLLW_Office_Final.csar was used for cartographic compilation.Data LogsData acquisition and processing notes are included in the acquisition and processing logs, and additional processing such as final tide and sound velocity application is noted in the H12680 Data Log spreadsheet. All data logs are submitted digitally in the Separates I folder.Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterDiscrete ZoningAlitak, AK9457804Kodiak Island, AK9457292Japanese Bay94576349457292.tidFinal Approved9457804.tidFinal ApprovedH12680CORF.zdfFinal2014-08-012014-08-26Final zoning and water level files were received for survey H12680 on 08/26/2014.Tide note is attachedNorth American Datum of 1983 (NAD83)UTM Zone 5 NorthSingle Base9677Aiaktalik IslandVessel kinematic data were post processed using Applanix POSPac processing software and the Single Base method was used as described in the DAPR. Smooth Best Estimate of Trajectory (SBET) and associated error (RMS) data were applied to all MBES data in CARIS HIPS and SIPS.Kodiak 313 kHz (100 BPS)True Heave file IssuesThe POS files on DN137 from 2808 200kHz corresponding to the following HDCS lines: 2014M_1372240, 2014M_1372246, 2014M_137250, and 2014M_1372208 were not transferred properly and subsequently deleted. This resulted in an error where the delayed heave file and navigation times do not match. Line 2014M_1372208 does not exist as part of H12680. The correct name of the line referred to in section C.3 is 2014M_1372308.A comparison was performed between survey H12680 and charts 16590_1, 16591_1, and ENC US4AK5LM, using CARIS sounding and contour layer derived from the 8-m combined surface. The contours and soundings have been overlaid on the chart to assess differences. All data from H12680 should supersede charted data.16590123481529112007-092014-04-152014-04-05Soundings from survey H12680 generally agreed within one to two fathoms with charted depths on chart 16590. Contours generated in CARIS HIPS and SIPS closely approximate the Charted 3, 10, 20, 30, 40, and 50 fathom contours with the notable exceptions shown in the figures below. H12680 northwest corner 30f contour discrepancy.SupportFiles\H16590_Contour Disagreement.png H12680 southeast corner contour layout.SupportFiles\Contour evaluations.png1659112342000092004-012014-03-032014-03-08Soundings from survey H12680 generally agreed within one to two fathoms with charted depths on chart 16591. Contours generated in CARIS HIPS and SIPS closely approximated the charted 3, 10, 20, 30, 40,and 50 fathom contours. Chart 16591 covers the top half portion of survey H12680. Notable exceptions to this general agreement are shown in the figures below.US4AK5MM 2000012014-04-152014-04-01falseSoundings from survey H12680 generally agreed within one to two fathoms with charted depths on US4AK5MM.Contours generated in CARIS HIPS closely approximated the charted 3,10,20,30,40, and 50 fathom contours.US4AK5LM8152972014-09-032014-09-03falseSoundings from survey H12680 generally agreed within one to two fathoms with charted depths on US4AK5LM. Contours generated in CARIS HIPS closely approximated the charted 3,10,20,30,40, and 50 fathom contours. See discussion from Chart 16590 for more details.No AWOIS items were assigned for this survey.No Maritime Boundary Points were assigned for this survey.All charted features for this survey are addressed in the H12680_Final_Feature_File.No uncharted features exist for this survey.20141412112One Danger to Navigation was found within the survey limits of H12680 and was reported to the Marine Chart Division on 10/09/2014 . A large rock exists with a 2.2 fathom least depth in close proximity to a charted sounding of 5.5 fathoms. The Danger to Navigation Report is included in Appendix III of this report. A confirmation e-mail was received on 10/10/2014. Submission and confirmation e-mail are in the supplemental survey records and correspondence folder.H12680 DTON with MBES Coverage.SupportFiles\HIPS DTON Overview.jpgH12680 DTON East Alitak Bay 2D View.SupportFiles\DTON 2..pngNo shoals or potentially hazardous features exist for this survey.No 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.Eight bottom samples were obtained in accordance with section 7.1 of the HSSD in areas designated by the feature object class (SPRING) in the Project Reference File (PRF). Each bottom sample was attributed and can be found in the H12680_Final_Feature_File. H12680 Bottom Samples CollectedSupportFiles\Bottom Samples.pngFairweather personnel conducted limited shoreline verification and reconnaissance at times near predicted negative of low tides within the survey limits. Annotations, information, and diagrams collected on DP forms and boat sheets during field operations are scanned and included in the digital Separates I folder. Shoreline verification procedures for survey H12680 conform to those in the DAPR.No prior survey comparisons exist for this survey.No Aids To Navigation (ATONs) exist for this survey.No overhead features exist for this survey.No submarine features exist for this survey.No ferry routes or terminals exist for this survey.No platforms exist for this survey.No significant features exist for this survey.No present or planned construction or dredging exist within the survey limits.No new surveys or further investigations are recommended for this area.No new insets 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 and Specifications Deliverables Manual, 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.CDR David J. Zezula Chief of PartyChief of Party2015-06-01 LT Ryan WartickField Operations Officer2015-06-01 LT Matthew ForneyField Operations Officer2015-06-01HCST Douglas Bravo Chief Survey Technician2015-06-01HSST Clinton MarcusSheet Manager2015-06-01Data Acquisition and Processing Report2014-10-03Horizontal and Vertical Control Report2014-10-03Coast Pilot Report2014-09-10