OPR-P136-RA-16North Coast of Kodiak Island, AKNorth Coast of KodiakNOAA Ship RAINIERH128498Southeast ArmAlaskaUnited States400002016Edward J. Van Den Ameele, CAPT/NOAANavigable Area2016-05-162016-09-172016-10-15Multibeam 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 8: "Southeast Arm" within the Project Instructions. The area is southwest of Dog Ear Mountain.57.7148333333153.54166666757.6298333333153.4965H12849 survey area as assigned in Project Instructions (Chart 16597)file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/ScreenCap_SurveyArea.pngData were acquired within survey limits as required in the Project Instructions and 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. 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 2-5).Pydro derived histogram plot showing HSSD object detection compliance of H12849 MBES data within 1-meter CUBE surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_1m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD object detection compliance of H12849 MBES data within 2-meter CUBE surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_2m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD object detection compliance of H12849 MBES data within 4-meter CUBE surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_4m_MLLW_Final.QAv2.density.pngPydro derived histogram plot showing HSSD object detection compliance of H12849 MBES data within 8-meter CUBE surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_8m_MLLW_Final.QAv2.density.pngInshore limit to 8 meter 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 meter water depthComplete Coverage MBES (HSSD Section 5.2.2.3 Option A).Complete multibeam coverage was achieved within the limits of hydrography as defined in the Project Instructions except where kelp, rocks, mud flats, or other dangerous conditions prevented survey operations to continue further inshore. These areas were generally located very near shore and judged to be navigationally insignificant. The following are the areas that do not meet the coverage requirement (Figures 6-8). One small "holiday" in survey coverage exists in East Arm, which measures approximately 4x7 meters (Figure 9). These gaps in coverage were examined to ensure that least depths were obtained over navigationally significant features. Complete coverage was not achieved due to safety concerns. file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_CoverageGap_1.pngComplete coverage was not achieved due to rocky features.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_CoverageGap_2.pngComplete coverage was not achieved due to safety concerns.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_CoverageGap_3.pngSubset and chart view of gap in survey coverage. file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_Holiday.pngH12849 Survey Coverage (Chart 16597).file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_SurveyCoverage.pngH12849 Geographic Context (Chart 16597)file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_SurveyCoveragea_entirechart.png2801054.0900000002802010.76000007.9502803043.0900000002804048.28000001.5300156.22000009.4806.07502005.52016-09-172016-09-182015-09-192016-09-302016-10-142016-10-15Refer 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 H12849 were acquired by survey launches 2801, 2802, 2803, and 2804 and skiffs 1905 and 1906. The survey launches acquired MBES depth soundings, backscatter data, bottom samples, and sound speed profiles. The skiffs conducted shoreline verification. ResonSeaBat 7125 SV2MBESResonSeaBat 7125-BMBESResonSVP71Sound Speed SystemSea-Bird ElectronicsSBE 19Plus SEACAT ProfilerConductivity, Temperature, and Depth SensorApplanixPOS-MV V5Positioning and Attitude SystemMultibeam crosslines were acquired using Rainier launches 2802 and 2804. A 4-meter CUBE surface was created using only mainscheme lines, and a second 4-meter CUBE surface was created using only crosslines. A difference surface was generated from these two surfaces in CARIS HIPS and SIPS at a 4-meter resolution. The difference surface was compared to the IHO allowable total vertical uncertainty (TVU) standards. In total 99.9% of the depth difference between H12849 mainscheme and crossline data met HSSD TVU standards. This analysis was performed on H12849 data reduced to Mean Lower-Low Water (MLLW) using Ellipsoidally Referenced Zoned Tides (ERZT) methods. Summary table indicating percentage of difference surface nodes between H12849 mainscheme and crossline data that met HSSD allowable TVU standards.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_CrosslineAnalysis_table.pngDepth-colored MBES overlay of acquired H12849 crossline data.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_XL_4m.png00.032ERS via ERZT2801, 2802, 2803, 280430.15Total Propagated Uncertainty (TPU) values for H12849 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-m separation model and statistically determining a measured uncertainty. The measured tide uncertainty value of 0.032 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 uncertainties, 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 H12849 MBES data (Figures 14-17). To visualize where uncertainty requirements were met, for each surface a custom "HSSD Compliance" layer was created, based on the difference between calculated uncertainty of the nodes and the allowable uncertainty defined in the HSSD. Pydro derived histogram plot showing HSSD uncertainty standards compliance of H12849 1-m finalized surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_1m_MLLW_Final.QAv2.tvu_qc.pngPydro derived histogram plot showing HSSD uncertainty standards compliance of H12849 2-m finalized surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_2m_MLLW_Final.QAv2.tvu_qc.pngPydro derived histogram plot showing HSSD uncertainty standards compliance of H12849 4-m finalized surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_4m_MLLW_Final.QAv2.tvu_qc.pngPydro derived histogram plot showing HSSD uncertainty standards compliance of H12849 8-m finalized surface.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_MB_8m_MLLW_Final.QAv2.tvu_qc.pngH12849 junctions with one other survey, H12917, a RAINIER survey. H12917 was acquired concurrently with H12849. H12849 Junction Surveysfile:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_Junction_Surveys.pngH12917400002016NOAA Ship RAINIERNWJunction analysis specifics between H12849 and H12917 are located in the H12917 DR. 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 when surveying a new area. Twenty-five CTD casts were acquired and applied to H12849 MBES data using the nearest in distance within time (4 hours) 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 been sent to the Processing Branch. Backscatter was not processed by the field unit.CARISHIPS/SIPS9.1.7NOAA Extended Attribute Files V_5_4. All features were processed using CARIS HIPS and SIPS 9.1 and CARIS Notebook 3.1.H12849_MB_1m_MLLWCUBE1-0.6776.43NOAA_1mComplete MBESH12849_MB_2m_MLLWCUBE2-0.6276.08NOAA_2mComplete MBESH12849_MB_4m_MLLWCUBE4-0.6176.05NOAA_4mComplete MBESH12849_MB_8m_MLLWCUBE8-0.1576.04NOAA_8mComplete MBESH12849_MB_1m_MLLW_FinalCUBE1-0.8220NOAA_1mComplete MBESH12849_MB_2m_MLLW_FinalCUBE21840NOAA_2mComplete MBESH12849_MB_4m_MLLW_FinalCUBE43676.05NOAA_4mComplete MBESH12849_MB_8m_MLLW_FinalCUBE87276.04NOAA_8mComplete MBESAll CARIS CUBE surfaces were created with lines reduced to MLLW via ERZT methods. Ten soundings were designated 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. Survey H12849 contains seven (7) designated soundings.Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterTCARI9455500.tidFinal ApprovedP136RA2016.tcFinal2016-10-242016-10-28H12849 features were tide corrected using a .tid file created in Pydro using the "TCARI TID file via S-57" function then loaded in CARIS Notebook. ERS via ERZTH12849_MLLW_SEP_1000mEllipsoidally Referenced Zoned Tides (ERZT) 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. One line was interpolated to correct for a period of two minutes on an SBET spike in the creation of the separation model. For additional information see the OPR-P136-RA-16 ERS Capability Memo included with the supplemental correspondence. World Geodetic System of 1984 (WGS84(G1674)Universal Transverse Mercator (UTM) Zone 5 NorthSingle BaseGreg's Vista9715For real time positioning during data acquisition WAAS was used. Chart comparisons were made using a CARIS sounding and contour layer derived from a 8-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. 165972559180000102015-042016-04-052016-04-09The comparison of soundings from Chart 16594 and H12849 showed general agreement within 1 fathom. The exceptions were noted from 3 to 22 fathoms in difference (Figure 19). The comparison of contours from Chart 16594 and H12849 showed general agreement, with the exception of the 10-fathom contour in the mid-region of the East Arm that tends to fall further inshore than what is charted (Figure 20). In addition, MBES coverage disproved two charted islets (Figure 21). A selection of soundings that are generally deeper than what is charted. file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/Soundings%20Comparison.pngThe 10-fathom contour near shore of what is charted.file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/10-fathomcontour.pngMBES coverage disproves two charted islets. file:///M:/OPRP136RA16/Surveys/H12849/Compilation/Report/Components/SupportFiles/H12849_DisprovedRocks.png16576287118000052015-042016-04-052016-04-09Chart 16576 does not overlap with coverage data, chart comparison not possible165942553178900142015-012016-04-052016-04-09Chart 16594 does not overlap with coverage data, chart comparison not possible. US4AK5QM8000062016-04-172016-04-17falseElectronic Navigation Chart (ENC) US4AK5QM coincides with Chart 16597, therefore a comparison between H12849 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.One "reported" feature exists near Mink Point which was disproved with full coverage multibeam data.No uncharted features exist for this survey.H12849_DTON2016-10-29Danger to Navigation Reports are included in Appendix II of this report.The DTON report is appended to this report. Dtons have not been applied to the latest charts.Features of navigational significance are discussed in the chart comparison sections above or are included in the H12849 Final Feature File submitted with this report. 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.Five bottom samples were investigated for this survey, the results are included in the H12849 Final Feature File submitted with this report.Limited shoreline verification was conducted in accordance with applicable sections of NOAA HSSD and FPM using the Project Reference File (PRF) and Composite Source File (CSF) provided with the Project Instructions. In the field, all assigned features that were safe to approach, were addressed as required with S-57 attribution and recorded in the H12849 Final Feature File (FFF) to best represent the features at chart scale. This file also includes new features found in the field as well as recommendations to update, retain or delete assigned features. Refer to the Supplemental Correspondence folder submitted with this report for a discussion concerning incomplete attribution of CSF features provided by HSD OPS. 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.There are no platforms within the H12849 survey area.There are no significant features in the survey area that are not discussed elsewhere in this report.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 Rainier2017-05-09Steven Loy, LT/NOAAField Operations Officer, NOAA Ship Rainier2017-05-09James B. JacobsonChief Survey Technician, NOAA Ship Rainier2017-05-09Jennifer Kraus, ENS/NOAASheet Manager2017-05-09