OPR-P136-RA-16North Coast of Kodiak Island,AKNorth Coast of Kodiak NOAA Ship RAINIERH128513Uganik BayAlaskaUnited States400002016Edward J. Van Den Ameele, CAPT/NOAANavigable Area2016-05-162016-09-162016-10-14Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersUniversal Transverse Mercator (UTM)UTCPacific 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. Any revisions to the Descriptive Report (DR) generated during office processing are shown in bold, red italic text. The processing branch maintains the DR as a field unit product, therefore, all information and recommendations within the body of the DR are considered preliminary unless otherwise noted. The final disposition of surveyed features is represented in the OCS nautical chart update products. All pertinent records for this survey, including the DR, are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via http://www.ncei.noaa.gov/.NOAAThe project area is referred to as Sheet 3: "Uganik Bay" within the Project Instructions. The area covers approximately 12.5 square nautical miles south of the "Entrance to Uganik Bay" on the north coast of Kodiak Island, Alaska (Figures 1 and 2).57.9001025153.64360111157.7917147222153.461976111 H12851 survey area as assigned in Project Instructions (Chart 16597).SupportFiles\Survey_Limits.pngH12851 survey area overview.SupportFiles\Survey Area Overview.pngSurvey data were acquired within survey limits in accordance with the requirements in the Project Instructions and the Hydrographic Surveys Specifications and Deliverables (HSSD) unless noted otherwise in this report.The purpose of this project is to provide contemporary surveys to update National Ocean Service (NOS) nautical charting products, which will support Kodiak's large fishing fleet and increasing levels of passenger vessel traffic. This survey is within an area identified as Emerging Critical and Navigationally Significant according to the 2012 NOAA Hydrographic Survey Priorities (NHSP).The entire survey is adequate to supersede previous data.The QC Tools - Grid QA tool within Pydro Explorer was used to analyze multibeam echosounder (MBES) data density. All finalized surfaces meet the HSSD data density requirement (Figures 3-7).Pydro derived histogram plot showing HSSD compliance of H12851 MBES data within the 1-meter finalized CUBE surface.SupportFiles\H12851_MB_1m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD compliance of H12851 MBES data within the 2-meter finalized CUBE surface.SupportFiles\H12851_MB_2m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD compliance of H12851 MBES data within the 4-meter finalized CUBE surface.SupportFiles\H12851_MB_4m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD compliance of H12851 MBES data within the 8-meter finalized CUBE surface.SupportFiles\H12851_MB_8m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD compliance of H12851 MBES data within the 16-meter finalized CUBE surface.SupportFiles\H12851_MB_16m_MLLW_Final.QAv2.density.pngInshore limit to 8 meters water depthComplete coverage MB with backscatter (Section 5.2.2.3) or Set Line Spacing MBES or SBES at 100m (HSSD Section 5.2.2.4).Greater than 8 meters water depthComplete Coverage MBES (HSSD Section 5.2.2.3 Option A).Complete MBES coverage was achieved within the limits of hydrography as specified in the Project Instructions except where it was unsafe to continue survey operations further inshore. The following areas do not meet coverage requirements: Near shore survey coverage to the south of Broken Point did not extend to the sheet limits in multiple areas due to rocks and shoal areas (Figure 8). Survey coverage near shore to the west of East Point did not extend to the sheet limits due to rocks and shoal areas (Figure 9). Survey coverage north of Village Islands did not extend to the sheet limits due to rocks and safety concerns of launch personnel. Missing coverage in this area is fully covered by sheet H12917 (Figure 10). Coverage did not extend to sheet limits due to unsafe conditions.SupportFiles\Missing_Survey_Coverage_Depth.pngCoverage did not extend to sheet limits due to unsafe condtions.SupportFiles\Missing_Coverage_East_Point.pngComplete coverage was not achieved due to rocks and safety concerns (sheet limits in black).SupportFiles\Missing_Survey_Coverage_Rock.pngH12851 Survey Coverage (Chart 16597)SupportFiles\H12851_Survey_Coverage.png2801064.87000003.550280204.050000011.8302803069.2100000002804045.6100000000183.740000015.3808.374048012.532016-09-162016-09-192016-09-282016-09-302016-10-032016-10-042016-10-062016-10-14Refer 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.28018.81.128028.81.128038.81.128048.81.119055.70.319065.80.3All data for survey H12851 was acquired by survey launches 2801, 2802, 2803, and 2804, and skiffs 1905 and 1906. The launches acquired MBES depth soundings, backscatter data, sound velocity profiles, and bottom samples. The skiffs conducted shoreline verification.ApplanixPOS-MV V5Positioning and Attiude SystemResonSVP71Sound Speed SystemResonSeaBat 7125 SV2MBESResonSeaBat 7125-BMBESSea Bird Electronics, Inc.19 plus SEACAT ProfilerConductivity, Temperature, and Depth SensorMultibeam crosslines were acquired using the Reson 7125 on launches 2801 (RA-4) and 2802 (RA-5). A 4-meter CUBE surface was created using only mainscheme lines, and a second 4-meter CUBE surface was created using only crosslines (Figure 12). A difference surface was generated from these two surfaces in CARIS at a 4-meter resolution. The absolute difference was compared to the IHO allowable total vertical uncertainty (TVU) standards for Order 1 depths (0-100 meters) and Order 2 depths (greater than 100 meters). In total, 99.79% of the depth differences between H12851 mainscheme and crossline data met HSSD TVU standards (Figure 13). This analysis was performed on H12851 data reduced to Mean Lower-Low Water (MLLW) using Ellipsoidally Referenced Zoned Tides (ERZT) methods.H12851 CrosslinesSupportFiles\H12851_XL_Pic.pngCrossline-based HSSD Compliance StatisticsSupportFiles\Crossline_IHO_Compliance_Pic.png00.034ERS via ERZT2801, 2802, 2803, 28043.0 0.15Total Propagated Uncertainty (TPU) values for H12851 were derived from a combination of fixed values for equipment and vessel characteristics, as well as field assigned values for sound speed uncertainties. Tidal uncertainties were accounted for by examining the field generated 1000-meter separation model and statistically determining a measured uncertainty. The measured tide uncertainty value of 0.034 meters was entered to account for ERZT processing methods. See the OPR-P136-RA-16 ERS Capability memo included in Supplemental Correspondence for further information. In addition to the usual a priori estimates of uncertainty, some real-time and post processed uncertainty sources were also incorporated into the depth estimates of this survey. Real-time uncertainties from Reson MBES sonars were recorded and applied during post processing. Applanix TrueHeave (POS) files, which record estimates of heave uncertainty, were also applied during post processing. Finally, the post processed uncertainties associated with vessel roll, pitch, yaw and navigation, were applied in CARIS HIPS using SBET / RMS files generated using POSPac software. Uncertainty values of submitted finalized grids were calculated in CARIS HIPS and SIPS using the "Greater of the Two" of uncertainty and standard deviation (scaled to 95%). The QC Tools - Grid QA tool within Pydro Explorer was used to analyze H12851 MBES data (Figures 14-18).1-meter finalized surface meets HSSD uncertainty standardsSupportFiles\H12851_MB_1m_MLLW_Final.QAv2.tvu_qc.png2-meter finalized surface meets HSSD uncertainty standardsSupportFiles\H12851_MB_2m_MLLW_Final.QAv2.tvu_qc.png4-meter finalized surface meets HSSD uncertainty standardsSupportFiles\H12851_MB_4m_MLLW_Final.QAv2.tvu_qc.png8-meter finalized surface meets HSSD uncertainty standardsSupportFiles\H12851_MB_8m_MLLW_Final.QAv2.tvu_qc.png16-meter finalized surface meets HSSD uncertainty standardsSupportFiles\H12851_MB_16m_MLLW_Final.QAv2.tvu_qc.pngH12851 junctions with three other surveys, H12850, H12916, and H12917. All surveys are part of project OPR-P136-RA-16 (Figure 19).H12851 Junction Surveys.SupportFiles\H12851_Junction_Overview.pngH12916400002016NOAA Ship RAINIERNEOverlap with Survey H12916 was approximately 4.37 nautical miles along the north eastern boundary of H12851 (Figure 20). The width of overlap between these two sheets varied from 130 meters to 465 meters. Depths in the junction area range from 4 meters to 260 meters. For the respective depths, the difference surface was compared to the allowable TVU standards specified in the HSSD. Analysis of the IHO Order 1 difference surface indicated a mean difference of 0.85 meters with a standard deviation of 0.45 meters. Analysis of the IHO Order 2 difference surface indicated a mean difference of 4.1 meters with a standard deviation of 0.79 meters. In total, 99.34% (Figure 21) of the depth differences between H12851 and junction survey H12916 are within allowable uncertainties.H12851 junction with H12916 (overlap in blue).SupportFiles\H12851_Junction.pngSummary table indicating the percentage of nodes from the junction overlap that met HSSD allowable TVU standards.SupportFiles\Junction_IHO_Pic.pngH12850400002016NOAA Ship RAINIERNWJunction analysis specifics between H12851 and H12850 are located in the H12850 DR.According to the H12850 DR, "The overlap with survey H12851 encompassed 1.09 square nautical miles along the southeastern boundary of H12850. A comparison was made using a difference surface derived from 8-meter CUBE surfaces of each survey. Analysis of the difference surface indicated that H12850 is an average of 0.02 meters deeper than H12851 with a standard deviation of 0.31 meters. For the respective depths, the difference surface was compared to the allowable TVU standards specified in the HSSD. 99.78% of the depth differences between H12850 and junction survey H12851 were within allowable uncertainties. The highest uncertainties corresponded with areas of steeply sloping seafloor."H12917400002016NOAA Ship RAINIERSEJunction analysis specifics between H12851 and H12917 are located in the H12917 DR.According to the H12917 DR, "The overlap with survey H12851 encompassed 0.52 square nautical miles along the northern boundary of H12917. A comparison was made using a difference surface derived from the 8-meter CUBE surfaces of each survey. Analysis of the difference surface indicated that H12917 is an average of 0.08 meters deeper than H12851 with a standard deviation of 0.54 meters. For the respective depths, the difference surface was compared to the allowable TVU standards specified in the HSSD. In total, 94.67% of the depth differences between H12917 and junction survey H12851 were within allowable uncertainties. The highest uncertainties corresponded with areas of dynamic seafloor topography."Sonar 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.Sound speed profiles were acquired using the SBE 19plus CTD probes at discrete locations within the survey area at least once every four hours, when significant changes in surface speed were observed, or where surveying a new area. In total 25 casts were taken for H12851. All casts were concatenated into a master file and applied to lines using the "Nearest distance within time" (4 hours) profile selection method. All equipment and survey methods were used as detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Raw Backscatter was logged as a 7k file and will be sent to the Processing Branch. Backscatter was not formally processed by the field unit.CarisHIPS/SIPS9.1.7NOAA Profile V_5_4H12851_MB_1m_MLLWCUBE1-2.59261.15NOAA_1mComplete MBESH12851_MB_1m_MLLW_FinalCUBE1-2.9420NOAA_1mComplete MBESH12851_MB_2m_MLLWCUBE2-2.40261.15NOAA_2mComplete MBESH12851_MB_2m_MLLW_FinalCUBE21840NOAA_2mComplete MBESH12851_MB_4m_MLLWCUBE4-2.33260.46NOAA_4mComplete MBESH12851_MB_4m_MLLW_FinalCUBE43680NOAA_4mComplete MBESH12851_MB_8m_MLLWCUBE8-1.79259.87NOAA_8mComplete MBESH12851_MB_8m_MLLW_FinalCUBE872160NOAA_8mComplete MBESH12851_MB_16m_MLLWCUBE16-0.63259.54NOAA_16mComplete MBESH12851_MB_16m_MLLW_FinalCUBE16144.00259.54NOAA_16mComplete MBESAll CARIS CUBE surfaces were created with lines reduced to MLLW via ERZT methods. A total of twenty seven soundings were designated: three as DTONs, twenty one as least depths for features found by multibeam, and three that were designated to force the submitted finalized surface to honor least depths in accordance with HSSD requirements. The 1-meter grid resolution range was expanded to include the full range of survey coverage. See Supplemental Correspondence for Project Manager approval.Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterSeldovia9455500TCARI9455500.tidFinal ApprovedP136RA2016.tcFinal2016-10-192016-10-28See attached Tide Note dated October 16, 2016.ERS via ERZTH12851_WGS84_MLLW_SEP_1000m.csarEllipsoidally Referenced Zoned Tides (EZRT) methods were used to transform between the ellipsoid and water level data. A 1000-meter resolution separation model between the ellipsoid and MLLW was computed using the real-time position measurements observed during the survey relative to the water line and the loaded TCARI tide file. "GPS tides" were then computed using the above separation model and the corrected GPS-height-to-water level data (SBET). The 1000-meter resolution separation model was generated in WGS84 due to the SBETs being exported in WGS84. For additional information see the OPR-P136-RA-16 ERS Capability Memo included with the supplemental correspondence. See attached ERS Capability Memo dated March 15, 2017.World Geodetic System of 1984 (WGS84(G1674))Universal Transverse Mercator (UTM) Zone 5 NorthSingle BaseGreg's Vista9715The Wide Area Augmentation System (WAAS) served as the real time horizontal control source for survey launches.Chart comparisons were made using a CARIS sounding and contour layer derived from a 16-meter combined CUBE surface. The contours and soundings were overlaid on the charts and compared for general agreement and to identify areas of significant change.16597255980000102015-042016-04-052016-04-09Chart 16597 covers the entire H12851 survey area. Deviations in 50, 10, and 3 fathom contours were found both inshore and offshore from what is charted. The 50 fathom contour deviates from the charted contour in some areas over 1000 meters (Figure 22). Large discrepancies between charted and H12851 soundings are highlighted in yellow circles (Figures 23-25). Though these soundings were up to 18 fathoms different than what was charted, they were not chosen as DTONs because they do not pose a danger to surface navigation for the vessel traffic in the area.50 fathom contour line shows shallower depths offshore of what is charted.SupportFiles\50ftm_Contour_Breaks_16597.pngShoaler soundings exist than charted in the area east of West Point.SupportFiles\Sounding_Differences_A_16597.pngShoaler soundings exist than charted in the area north of West Point.SupportFiles\Sounding_Differences_B_16597.pngCharted 50 fathom contour aligns poorly with H12851 contour near East Point.SupportFiles\Mesa Rks contour line.pngOverview of charted contours and H12851 contours.SupportFiles\Contour_Overview_16597.png1657628718000052015-042016-04-052016-04-09Chart 16576 covers the northern half of survey H12851. H12851 soundings were generally more shallow than charted soundings, and H12851 contour lines deviate from charted contour lines in many areas. Discrepancies between charted contours and H12851 contours were similar to the comparison made with Chart 16597.16594255378900142015-012016-04-052016-04-09In the area of survey H12851, Chart 16594 has no comparable data and therefore no comparison was made.US4AK5QM8000062016-04-172016-04-17falseIn the area of survey H12851, Electronic Navigation Chart (ENC) US4AK5QM coincides with Chart 16597. Therefore a comparison between H12851 and the ENC is equivalent to the preceding comparison with Chart 16597.No Maritime Boundary Points were assigned for this survey.No charted features exist for this survey.No uncharted features exist for this survey.3H12851_DTON_Report2016-12-09Danger to Navigation Reports are included in Appendix II of this report.All shoals and hazardous features were investigated in accordance with the Project Instructions and the HSSD. They are addressed in the Final Feature File submitted with this report. One pilot boarding area exists within H12851, located in the area between East Point and West Point. Evaluated soundings within the area agree with charted soundings. The area appears to be safe for pilot boarding operations.Four bottom samples were acquired for this survey and are detailed in the Final Feature File accompanying this report.Shoreline verification was conducted near predicted mean lower low water in accordance with applicable sections of the FPM and HSSD. There were 43 assigned features for this survey and all but 6 were addressed. The six not addressed features were located in foul areas too dangerous to pursue. New features found in the field as well as recommendations to update, retain, or delete assigned features have also been documented. All features were addressed as required with the S-57 attribution and recorded in the H12851 Final Feature File to best represent the features at survey scale. 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.Edward J. Van Den Ameele CAPT/NOAACommanding Officer, NOAA Ship Rainier2017-05-04Steven Loy, LT/NOAAField Operations Officer, NOAA Ship Rainier2017-05-04James B. Jacobson Chief Survey Techinician, NOAA Ship Rainier2017-05-04Daniel PrinceHydrographic Assistant Survey Technician, NOAA Ship Rainier2017-05-04