Navigable Area2018F00736AlaskaSoutheast AlaskaLisianski Inlet Southeast200002018-06-262018-07-032018-06-12OPR-O375-RA-18NOAA Ship RAINIERDavid J. Zezula, CAPT/NOAAKongsberg MaritimeEM 2040MBESKongsberg MaritimeEM 710MBESPacific Hydrographic BranchmetersThe 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/.
North American Datum 1983Mean Lower Low WaterVDatumProjected UTM 82018-07-30The project instructions refer to the survey area as H13008, "Lisianski Inlet Southeast" (Sheet 1). However, subsequent to the final project instructions, the survey registry number was changed from H13008 to F00736 to reflect modifications to the scope of the survey due to a limited time window. The memo approving this change accompanies this submission. The assigned survey area is approximately 10 SNM.
Due to limited time and launch crew members, Rainier was not able to complete this survey. Bathymetry was not acquired to the NALL, cross lines were not completed, shore line features and ATONs were not investigated, bottom samples were not acquired, and holidays were not addressed. Most of the MBES data collected was with the ship and a few launch boat days with the main focus on Pelican Harbor.
The Hydrographer recommends revisiting the survey area in the 2019 to complete the acquisition of MBES, shoreline feature, cross lines, and holidays.58.024045136.39038257.843272136.032455Lisianski Inlet Southeast area surveyed for F00736SupportFiles\F0736_Lisianski_Inlet_Southeast_MB_coverage.PNGF00736 multibeam data holidays from acoustic shadows.SupportFiles\F00736_South_Lisianski_Inlet_Shadow_Holiday.PNGF00736 multibeam data holidays from sloped bathymetry.SupportFiles\F00736_South_Lisianski_Inlet_Slope_Holiday.PNGF00736 multibeam data holidays from acoustic shadows and sloped bathymetry.SupportFiles\F00736_South_Lisianski_Inlet_Shadow_Holiday2.PNGF00736 extent of multibeam coverage: yellow areas indicate where the 3.5 meter contour was reached.SupportFiles\F00736_South_Lisianski_Inlet_Sonar_coverage.PNGThe navigationally complex Lisianski Inlet are heavily trafficked by recreational boaters, yachts, and smaller tug and tow traffic, as well as being an important route of the Alaska Marine highway ferry system. Despite the volume of marine traffic in the region, the vast majority of Lisianski Inlet was last surveyed in 1917, when data were acquired using lead line techniques. This 10 SNM project will provide contemporary surveys to update National Ocean Service (NOS) nautical charting products. Survey data from this project is intended to supersede all prior survey data in the common area.The entire survey is adequate to supersede previous data.Limited launch acquisition due to time and experienced personnel limitations meant that the NALL was not reached for the majority of this survey . Please reference 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 survey data are discussed below.
Sound Speed Methods:
Sound speed profiles were acquired using both the Rolls Royce MVP200 and Sea-Bird Electronics SBE19plus
SEACAT Profiler at discrete locations within the survey area at least once every four hours, when significant changes in surface sound speed were observed, or when starting a new day of surveying. A total of eight casts were acquired and applied to F00736 MBES using the "Nearest in distance within 4 hours” profile selection method found in Caris HIPS and SIPS.
Flier Finder:
Pydro QC Tools 2 Detect Fliers was used to find fliers in the finalized VR surface. The following are the settings used for Detect Fliers: (1) Force flier heights left blank (2) Checks - #1 and #6 unchecked, # 2 #3 #4 and #5 checked (3) Filters - Distance <= 1.0 nodes, Delta Z <= 0.01 meters, #1 and #2 unchecked.
Obvious noise was rejected by the hydrographer in Caris subset editor. After data cleaning, Detect Fliers listed 5 potential fliers. All potential fliers were investigated by the hydrographer in CARIS subset editor and were found to be false positives, edge fliers, or caused by the down slope of the sea floor. The results of the Detect Fliers tool are included as a .000 file in Appendix II of this report. Potential fliers shown in Figures below.F00736 Sound speed cast locationsSupportFiles\F00736_North_LIsianski_Sound_Speed.PNGF00736 false positive fliers on slope, subset editor showing multibeam data.SupportFiles\F00736_Fliers_Slope.pngF00736 false positive fliers in holiday, subset editor showing multibeam data.SupportFiles\F00736_Fliers_Holiday.pngUncertainty values were measured and applied in accordance with Section B.4 of the DAPR.
The Total Propagated Uncertainty (TPU) values for survey F00736 were derived from a combination of fixed values for equipment and vessel characteristics, as well as field assigned values for sound spreed uncertainties. A tidal uncertainty of 0.09 meters derived from the Poor Man's V-Datum (PMVD) model and used for all TPU calculations. This uncertainty was provided by NOAA's office of Coast Survey and additional details can be found in Appendix II.
Uncertainty values of the submitted finalized variable resolution grid were calculated using the "Greater of the Two" uncertainty and standard deviation (Scaled to 95%). Pydro QC tools 2 was used to analyze F00736 TVU compliance; a histogram plot of the results are shown below.Pydro derived histogram plot showing TVU compliance on F00736 VR surface.SupportFiles\F00736_MB_VR_MLLW_Final.QAv5.tvu_qc.pngUS5AK02M1000042016-10-042016-10-04falseF00736_MB_VR_MLLWVRVR-0.3203.6NOAA_VRComplete MBESF00736_MB_VR_MLLW_FinalVRVR-0.3203.6NOAA_VRComplete MBESF00736 survey data was compared to Electronic Navigation Chart (ENC) US5AK02M using the CUBE VR surface, selected soundings, and contours created in Caris HIPS and SIPS.
Chart comparison US5AK02M:
ENC US5AK02M covers all of F00736. Depth curves on ENC US5AK02M that apply to the F00736 survey area are 20, 10, and 3 fathoms. The survey soundings derived from F00736 generally follow the curves depicted in ENC US5AK02M.
ENC US5AK02M displaying Pelican Harbor has inconsistencies in the southeast portion of the ENC where 20 and 10 fathom curves are offset by approximately 50 meters, and land areas are offset and conflict with features displayed on the chart.
Junction comparison H13009:
The junction with survey H13009 encompasses 0.11 square nautical miles along the north boundary of survey F00736. H13009 is the northern part of Lisianski Inlet and was acquired concurrently with F00736 by the RAINIER. The Compare Grids function of Pydro Explorer derived a difference surface from the VR CUBE surfaces of each survey for comparison. Analysis of the difference surface indicated that survey F00736 is an average of 0.1 meters deeper than survey H13009, with a standard deviation of 0.57 meters.
F00736 20-fathom (in blue) and 10-fathom (in green) overlaid on ENC US5AK02M showing some variation between survey data and ENC charted data.SupportFiles\F00736_North_Lisianski_chart_comparison.PNGF00736 20-fathom (in blue), 10-fathom (in green), and 3-fathom (in red) overlaid on ENC US5AK02M showing some variation between survey data and ENC charted data.SupportFiles\F00736_North_Lisianski_chart_comparison_2.PNGENC Discontinuity. The red rectangle identifies an area with the 20-fathom contour offset about 50 meters near the city of Pelican. F00736 10-fathom contour (in green) overlaid on ENC US5AK02M has some variation between survey data and ENC charted data.
SupportFiles\F00736_Pelican_Lisianski_chart_comparison.PNGF00736 20-fathom (in blue) and 10-fathom (in green) overlaid on ENC US5AK02M showing some variation between survey data and ENC charted data.
SupportFiles\F00736_North_Lisianski_chart_comparison_4.PNGF00736 and H13009 junctions and difference surface.SupportFiles\F00736_Junction_overview.PNGPydro derived graph showing percentage-pass value of F00736 junction comparison with H13009.SupportFiles\F00736_MB_VR_MLLW_Final-H13009_VR_MS_MLLW_final_fracAllowErr_Freq.pngPydro derived plot showing absolute difference statistics of junction between surveys F00736 and H13009.SupportFiles\F00736_MB_VR_MLLW_Final-H13009_VR_MS_MLLW_final_depth_delta.pngPydro derived plot showing node depth vs. allowable error fraction of the junction between surveys F00736 and H13009.SupportFiles\F00736_MB_VR_MLLW_Final-H13009_VR_MS_MLLW_final_fracAllowErr_vsDepth.pngA request for final approved tides was to N/OPS1 on 08/06/2018; the final tide note was received on 08/16/2018.
Ellipsoid to Chart Datum Separation File: OPR-O375_FARA-18-Lisianski_NSPMVD_NAD83-MLLW_Expanded.csar
Sounding elevations relative to the ellipsoid were collected through Ellipsoidal Referenced Survey (ERS) with post processing of the daily logged POSPac data to create a statistical best estimate of trajectory (SBET) file, as detailed in the DAPR. All F00736 data meets HSSD vertical accuracy requirements.Precise Positioning-Real Time Extended (PP-RTX) processing methods were used in Applanix POSPac MMS 8.2.1
software to produce SBETs for post-processing horizontal correction. All F00736 data meets HSSD horizontal
accuracy requirementsNo additional results for this survey.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 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. This survey is complete and no additional work is required with the exception of deficiencies noted in the Survey Summary Report. David J. Zezula, CAPT/NOAACommanding Officer, NOAA Ship RAINIER2018-11-14Andrew R. Clos, LT/NOAA Field Operations Officer, NOAA Ship RAINIER2018-11-14James B. JacobsonChief Survey Technician, NOAA Ship RAINIER2018-11-14Jonathan A. WitmerSurvey Technician, NOAA Ship RAINIER2018-11-14