S-N907-NRTSE-21 Rich Passage, WA Puget Sound NOAA NRT-Seattle H13531 2 Rich Passage Washington United States 10000 2021 Patrick Faha, LTJG/NOAA Navigable Area 2021-06-08 2021-07-19 2021-08-04 Multibeam Echo Sounder Multibeam Echo Sounder Backscatter meters UTC Pacific Hydrographic Branch 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 10N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit. CC0-1.0 (NOAA Field Units) CC0-1.0 https://creativecommons.org/publicdomain/zero/1.0/ https://creativecommons.org/publicdomain/zero/1.0/legalcode These data were produced by NOAA and are in the public domain within the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0). NOAA The survey area is located in Puget Sound within the sub locality of Rich Passage. 47.60202777777778 122.60358333333333 47.55438888888889 122.5093611111111 Data were acquired to the survey limits in accordance with the requirements in the Project Instructions and the April 2021 NOS Hydrographic Surveys Specifications and Deliverables (HSSD) with the exceptions noted in this report (Figure 1). In all areas where the 3.5 meter depth contour or the sheet limits were not met, the Navigable Area Limit Line (NALL) was defined as the inshore limit of bathymetry due to the risks of maneuvering the survey vessel in close proximity to environmental or man made features. See Appendix II Supplemental Survey Records and Correspondence for more information. Assigned sheet limits (Pink), surveyed area (blue) on ENC US5WA14M and US5WA21M. SupportFiles\H13531_Coverage.jpg The Regional Navigation Manager has requested a contemporary hydrographic survey in Rich Passage to update the nautical chart. 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. Data acquired in H13531 meets multibeam echo sounder (MBES) coverage requirements for Object Detection, as required by the HSSD with the exceptions noted in this report. This includes crosslines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). Additional compliance statistics can be found in the Standards and Compliance located in Appendix II of this report. The surface was analyzed using the HydrOffice QC Tools Grid QA feature (Figure 2-3). Density requirements for H13531 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3. The few nodes that did not meet density requirements are due to sparse data in the outer beams, especially near steep slopes and rocky areas where acoustic shadowing occurred, and at the edges of the survey limits. Pydro derived histogram plot showing HSSD object detection compliance for H13531 MBES within the finalized CUBE surface. SupportFiles\H13531_VR_MLLW_FINAL.QAv6.density.png Uncertainty distribution for H13531. SupportFiles\H13531_VR_MLLW_FINAL.QAv6.tvu_qc.png All waters in survey area Object Detection Coverage (Refer to HSSD Section 5.2.2.2) The entirety of H13531 was acquired in accordance with the Object Detection MBES coverage standard, meeting the requirements listed above and in the HSSD with the exceptions noted in this report. Data is adequate to supersede charted. (Figure 4) The Navigable Area Limit Line (NALL) was defined as the inshore limit of bathymetry. In areas where the 3.5 m depth contour was not met, it was due to the risks of maneuvering the survey vessel in close proximity to the shoreline and obstructions. (Figure 5) Holidays: H13531 data were reviewed in CARIS HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the HSSD. One hundred and forty nine holidays and one possible holiday have been identified via HydrOffice QC Tools Holiday Finder tool using 'Object Detection' settings. This tool automatically scans the surface for holidays as defined in the HSSD and was run in conjunction with a visual inspection of the surface by the hydrographer. Many of the flagged holidays are the result of acoustic shadowing and occur in areas where steep bedrock is exposed on the seafloor (Figure 6-7). These shadows are formed due to lack of coverage on the side opposite the sonar head. All areas with acoustic shadows were investigated in CARIS Subset Editor to verify least depths were found. Holidays are also present in the near shore areas, inshore or just offshore of the 3.5m depth contour. Gaps in coverage present at the inshore limits of H13531 were not met due to the proximity of the shoreline and safety concerns. Particularly where rocky areas, shoal water, and man made structures, such as piers and fish pens, made it too dangerous to acquire additional bathymetry (Figure 8). Reasonable attempts were made to cover all gaps in coverage that resulted from lack of coverage when it was safe and prudent to do so. Features were added or updated accordingly in the Final Feature File (FFF) where applicable. H13531 survey coverage on ENC US5WA14M and US5WA21M. SupportFiles\H13531_Coverage_rbow.jpg H13531 survey coverage, inshore of 3.5m in red on ENC US5WA14M and US5WA21M. SupportFiles\H13531_NALL.jpg Holidays in yellow flagged on exposed bedrock. SupportFiles\H13531_Holidays_bedrock.jpg Detail of holidays observed in areas with exposed bedrock. SupportFiles\H13531_Holidays_AcousticShadows.jpg Near shore holidays indicated in yellow where hazards restricted maneuverability. SupportFiles\H13531_Holidays_nearshore.jpg NRT3_S3006 0.0 165.04 0.0 0.0 0.0 0.0 0.0 10.46 0.0 0.0 165.04 0.0 0.0 0.0 0.0 0.0 10.46 0.0 6.4 0 0 0 0 3.518 2021-07-19 2021-07-20 2021-07-21 2021-07-22 2021-07-23 2021-07-27 2021-07-28 2021-08-03 2021-08-04 This survey was collected from 07/19/2021 to 08/04/2021 with NRT-Seattle team members. Refer to the S-N906-NRTSE-21 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. NRT3_S3006 10.5 1.2 S3006 SupportFiles\Manda_20180419_132724.jpg MBES Kongsberg Maritime EM 2040C Sound Speed System AML Oceanographic MicroX SV Conductivity, Temperature, and Depth Sensor YSI CastAway-CTD Positioning and Attitude System Applanix POS MV 320 v5 The equipment was installed on S3006 (Figure 9). The vessel is equipped with POS MV v5 system for positioning and attitude, Kongsberg EM 2040C for MBES, AML Oceanographic MicroX SVS surface sound speed sensor, and YSI CastAway-CTD casts. Crosslines were collected, processed and compared in accordance with Section 5.2.4.2 of the HSSD (Figure 10) . A Variable Resolution (VR) surface was created of only mainscheme lines, and a second VR surface was created of only crosslines. A difference surface was generated in Pydro tool's Scribble by subtracting the crossline only surface from the mainscheme surface (mainscheme- crosslines= difference surface), from which statistics were derived. Statistics show the mean difference between the depths derived from mainscheme data and crossline data was 0.35 meters and 95% of nodes falling within 0.38 meters (Figure 11). For the respective depths, the difference surface was compared to the allowable NOAA uncertainty standards (Figure 12). In total, 99% of the depth differences between H13531 mainscheme and crossline data were within allowable NOAA uncertainties (Figure 13). The largest differences exhibited are in areas where stong tidal currents exist that may have affected the data quality. Visual inspection of the difference surface indicated no systematic issues. H13531 Crosslines. SupportFiles\H13531_XL.jpg The statistics and distribution summary plot of the difference between H13531 mainscheme and crossline data. SupportFiles\H13531_VR_MLLW_FINAL-H13531_XL_VR_FINAL_depth_delta.png Histogram plot utilizing the magnitude of the Allowable Error Fraction to show the indication of what percentage of the total number of comparisons pass the TVU max test for H13531. SupportFiles\H13531_VR_MLLW_FINAL-H13531_XL_VR_FINAL_fracAllowErr_Freq.png Depth differences between H13531 mainscheme and crossline data as compared to NOAA allowable uncertainty standards for the associated depths. SupportFiles\H13531XL_AllowUncert.jpg ERS via VDATUM 0.0 0.095 S3006 4.0 0.05 Total Propagated Uncertainty (TPU) values for H13531 were derived from a combination of fixed values for equipment and vessel characteristics, as well as field assigned values for sound speed uncertainties. The uncertainty for the VDatum model was provided to the field unit. In addition to the usual a priori estimates of uncertainty provided via device models for vessel motion, VDatum, and real-time and post-processed uncertainty sources were also incorporated into the depth estimates of survey H13531. Real-time uncertainties from the Kongsberg 2040C MBES sonars were incorporated and applied during post processing. Uncertainties associated with vessel roll, gyro, and navigation were applied real-time. H13531 utilized kinematic (RTK) positioning service. The recorded delayed heave Applanix files included an estimate of the heave uncertainty and were applied during post processing. All of the aforementioned uncertainties were applied in CARIS. H13531 is an ellipsoidally referenced survey (ERS) and the tidal component was accomplished via separation model. The surface was analyzed using the HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Overall, 99.5% of nodes within the surface meet NOAA Allowable Uncertainty specifications for H13531 (Figure 14). H13531 Node Uncertainty as a fraction of Allowable SupportFiles\H13531_VR_MLLW_FINAL.QAv6.tvu_qc.png H13531 junctions with contemporary survey H13530 from S-N907-NRTSE-21, Approaches to Bremerton. Processing for H13530 was completed after H13531 and a junction comparison between H13531 and H13530 will be conducted and included in the DR for H13530. From the H13530 DR: "The east side of H13530 junctions with contemporary survey H13531. A Variable Resolution (VR) Combined Uncertainty Bathymetry Estimator (CUBE) surface of H13530 data and a VR CUBE of surface of H13531 data were differenced. The mean difference between bathymetric surface nodes was -0.069m with a standard deviation of 0.069m. Statistics and visual inspection indicate that surveys H13530 and H13531 are in general agreement." H13530 junctions with H13531 to the east. H13530 sheets limit in pink, area of overlap indicated by colored surface, allowable error fraction defined by color gradient file:///M:/SN907NRTSE21/Surveys/H13531/01_HDR/Images/HDR_Images/H13530_H13531_Junction.jpg H13530 and H13531 difference surface comparison statistics file:///M:/SN907NRTSE21/Surveys/H13531/01_HDR/Images/HDR_Images/H13530_H13531_Junction2.jpg Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR. None Exist There were no conditions or deficiencies that affected equipment operational effectiveness. None Exist There were no other factors that affected corrections to soundings. Minimum every four hours Casts were conducted at a minimum of one every four hours in the deepest water nearest to the active survey area during launch acquisition. Casts were conducted more frequently in areas where the influx of freshwater had an effect on the speed of sound in the water column, when there was a change in surface sound speed greater than four meters per second, and over varying depths (Figure 15). SVP casts were applied to the MBES lines in CARIS using the “nearest in distance within time of 4 hours” method. All sound speed methods were used as detailed in the DAPR. H13531 Sound speed cast locations. SupportFiles\H13531_Cast_locations.jpg All equipment and survey methods were used as detailed in the DAPR. Density The surface was analyzed using the HydrOffice QC Tools Grid QA feature and the results are shown in Figure 16 below. Density requirements for H13531 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3. The few nodes that did not meet density requirements are due to sparse data in the outer beams, especially near steep slopes and rocky areas where acoustic shadowing occurred, and at the edges of the survey limits. Data Density distribution for H13531. SupportFiles\H13531_VR_MLLW_FINAL.QAv6.density.png All data reduction procedures conform to those detailed in the DAPR. All sounding systems were calibrated as detailed in the DAPR. Raw backscatter data is logged as .all file for delivery to NOAA's Pacific Hydrographic Branch. NOAA's Navigation Response Branch field units are waived from producing backscatter mosaics for the 2021 field season. All equipment and survey methods were used as detailed in the DAPR. CARIS HIPS and SIPS 11.3.6 NOAA Extended Attribute Files Version 2021 H13531_VR_MLLW CARIS VR Surface (CUBE) VR -0.86 105.385 NOAA_VR Object Detection H13531_VR_MLLW_FINAL CARIS VR Surface (CUBE) VR -0.86 105.385 NOAA_VR Object Detection The NOAA CUBE parameters defined in the HSSD were used for the creation of all CUBE surfaces for H13531. The surfaces have been reviewed where noisy data, or 'fliers' are incorporated into the gridded solutions causing the surface to be shoaler or deeper than the true sea floor. Where these spurious soundings cause the gridded surface to be shoaler or deeper than the reliably measured seabed by greater than the maximum allowable Total Vertical Uncertainty at that depth, the noisy data have been rejected by the hydrographer and the surface recomputed. Flier Finder, part of the QC Tools package within HydrOffice, was used to assist the search for spurious soundings following gross cleaning. Flier Finder was run iteratively until all remaining flagged fliers were deemed to be valid aspects of the steep slopes and dynamic nature of the seafloor. The finalized surface retained 509 edge fliers and 45 LaPlacian fliers after iterative cleaning. The edge fliers exist along areas extensively cleaned where every effort has been made to remove obvious spurious soundings (Figure 17), as well as in acoustic shadows on the lee side of steeply sloping bedrock exposures (Figure 18). The LaPlacian fliers all exist in the vicinity of Port Orchard Rocks and similarly, appear in bedrock derived acoustic shadows (Figure 19). Maximum extent of coverage of H13531 with example of edge fliers. SupportFiles\H13531_EdgeFliers.jpg Coverage along steep sloping bedrock exposures in H13531 with an example of acoustic shadows creating additional edge fliers. SupportFiles\H13531_BedrockFliers.jpg Coverage in the vicinity of Port Orchard Rocks where steep sloping bedrock exposures caused this example of LaPlacian fliers on acoustic shadows. SupportFiles\H13531_LaPlacianFliers.jpg H13531 surfaces have been created with an approved VR gridding algorithm that emphasizes smallest possible resolution. The smallest resolution within this VR grid is 0.2m, exceeding the resolution requirements of Object Detection surveys. Despite this, the surface still manages to meet specification with respect to grid density and holidays Per Section 5.2.2.1.3 of the 2020 Field Procedures Manual, no Horizontal and Vertical Control Report has been generated for H13531 Mean Lower Low Water ERS via VDATUM S-N907_VDatumLimits_100m_NAD83-MLLW_geoid12b North American Datum 1983 Projected UTM 10 RTX Precise Positioning-Real Time Extended (PP-RTX) processing methods were used in Applanix POSpacMMS 8.4 software to produce SBETs for post-processing horizontal correction. All of H13351 meets HSSD horizontal accuracy requirements. A comparison was performed between survey H13531 and ENC US5WA14M and US5WA21M using CARIS HIPS and SIPS sounding and contour layers derived from the finalized VR surface. The contours and soundings were overlaid on the charts to assess differences between the surveyed soundings and charted depths. All data from H13531 should supersede charted data. In general, surveyed soundings agree with the majority of charted depths. A full discussion of the disagreements follows below. US5WA14M 25000 32 2021-09-29 2021-09-29 US5WA21M 10000 15 2021-10-15 2021-10-15 No shoals or potentially hazardous features exist for this survey. A total of 220 charted features were investigated. 6 features were deemed appropriate for updating, 38 features were deemed appropriate for deletion, 7 assigned features were not addressed, and 170 features were deemed appropriate to be retained as charted. Survey H13531 has 14 new feature that are addressed in the H13531 Final Feature File, to include one newly identified wreck at 47.575 N, 122.533 W. A comparison between the soundings of H13531 and one charted channel area through Rich Passage was conducted. No significant difference exists between the observed and charted depths. Sixteen aids to navigation (AtoN) were investigated while conducting survey H13531. No AtoNs were off station Reference the Final Feature File for further information. No Maritime Boundary Points were assigned for this survey. No bottom samples were required for this survey. No overhead features exist for this survey. A submarine cable area exists along the western and northern sides of Rich Passage and another, smaller, cable area exists on the western shore of the Port Orchard peninsula at Waterman Point. No exposed cables were noted in the multibeam within the charted areas. No platforms exist for this survey. Ferry routes and/or terminals exist for this survey, and should remain as charted. No abnormal seafloor or environmental conditions 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 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. Patrick Faha Chief of Party 2022-06-09