OPR-L397-FA-22 Channel Islands National Marine Sanctuary Channel Islands National Marine Sanctuary NOAA Ship Fairweather (S220) H13556 2 8NM East of Santa Rosa Island California United States 20000 2022 CDR Meghan McGovern Navigable Area 2022-09-30 2022-11-04 2022-11-05 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 11N, 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 8NM East of Santa Rosa Island, California 33.99 119.94 33.897999999999996 119.905 H13556 sheet limits (in blue) survey coverage overlaid into ENC US3CA69M file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_coverage.jpg Data were acquired to the survey limits in accordance with the requirements in the Project Instructions and the 2022 NOS Hydrographic Surveys Specifications and Deliverables (HSSD). This year the Channel Islands National Marine Sanctuary work will focus on the remaining survey area (prior projects 2017-2019 and 2021) offshore of the Channel Islands (about 10 SNM), located about 30 miles offshore of the California mainland city of Santa Barbara. The waters surrounding CINMS are highly productive and are home to recreational and commercial fishing efforts, and regularly host kayakers, surfers, sightseers, whale watchers, researchers, and Channel Islands National Park concessionaires, who all access the sanctuary via boats. Correspondingly, the abundance of sea life and aquatic habitats drives a thriving industry of recreational and commercial fishing that brings varied vessel traffic through the waters of CINMS. Additionally, major mainland port traffic transiting to and from Los Angeles and Long Beach, California routes large cargo and tanker vessels close to CINMS boundaries. The Ports of Los Angeles and Long Beach are top 10 ports in the United States for containers and tonnage. This poses a serious risk to life, property, and the delicate ecosystem of the area. This survey will continue modern mapping efforts to identify any similar threats that may exist in these waters. The CINMS hydrographic survey will be as unique as the region itself. In addition to providing data for crucial nautical chart updates, this survey will also generate backscatter data, which will be used in habitat mapping and substrate analysis. Both multibeam echo sounder and backscatter data will not only serve to enhance marine navigational safety, but will also be used by sanctuary managers, planners, and researchers, aiding them in the conservation of this most precious resource. 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 H13556 meet multibeam echo sounder (MBES) coverage requirements for complete coverage, as required by the HSSD. This includes crosslines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). All waters in survey area Complete Coverage Survey coverage was in accordance with the requirements listed above and in the HSSD. H13556 sheet limits (in blue) survey coverage overlaid into ENC US3CA69M file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_coverage.jpg FA-S220 0.0 108.65 0.0 0.0 0.0 0.0 0.0 6.47 0.0 0.0 108.65 0.0 0.0 0.0 0.0 0.0 6.47 0.0 5.95 0 0 0 0 12.09 2022-11-04 2022-11-05 Refer to the OPR-L397-FA-22 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. S220 70.4 4.8 S220 file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_FA.jpg MBES Kongsberg Maritime EM 712 Positioning and Attitude System Applanix POS MV 320 v5 Sound Speed System Teledyne RESON SVP 70 Conductivity, Temperature, and Depth Sensor AML Oceanographic MVP200 Crosslines were collected, processed and compared in accordance with Section 5.2.4.2 of the HSSD. For adequate crossline comparison 5.95% of crossline to mainscheme MBES data was collected.To evaluate crosslines, a surface generated via data strictly from mainscheme lines and a surface generated via data strictly from crosslines were created. From these two surfaces, a difference surface (mainscheme - crosslines = difference surface) was generated. Statistics show the mean difference between the depths derived from mainscheme data and crossline data was 0.02 meters (with mainscheme being deeper and 95% of nodes falling within 0.20 meters). For the respective depths, the difference surface was compared to the allowable NOAA uncertainty standards. In total, 99.5+% of the depth differences between H13556 mainscheme and crossline data were within allowable NOAA uncertainties. The area with differences of 2.0m or more were condensed where soundings show an uneven seafloor, likely causing the difference in gridding. Overview of H13556 crosslines with highest difference in gridding at uneven seafloor. file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_crosslines.jpg H13556 crossline and mainscheme difference statistics. file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_crosslines_main_lines.jpg Depth differences between H13556 mainscheme and crossline data as compared to NOAA allowable uncertainty standards for the associated depths. file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Depth_difference.jpg ERS via ERTDM 0.078 S220 1 0.5 In addition to the usual a priori estimates of uncertainty via device models for vessel motion and ERTDM, real-time and post-processed uncertainty sources were also incorporated into the depth estimates of survey H13556. Real-time uncertainties were provided via EM 712 MBES data and Applanix Delayed Heave RMS. Following post-processing of the real-time vessel motion, recomputed uncertainties of vessel roll, pitch, gyro and navigation were applied in CARIS HIPS and SIPS via a Smoothed Best Estimate of Trajectory (SBET) RMS file generated in Applanix POSPac. Concur with clarification. The correct values used during the georeference bathymetry process were as followed: The Tide uncertainty at 8.5 cm and the Measured MVP at 2 meter/second. H13556 junctions with 3 adjacent surveys from this project, H13025, H13208 and H13088 survey from prior projects. Data overlap between H13556 and each adjacent survey was achieved. These areas of overlap between surveys were reviewed in CARIS HIPS and SIPS by surface differencing (at equal resolutions) to assess surface agreement. The multibeam data were also examined in CARIS Subset Editor for consistency and agreement. The junctions with H13556 are generally within/exceed the NOAA allowable uncertainty in their areas of overlap. For all junctions with H13556, a negative difference indicates H13556 was shoaler and a positive difference indicates H13556 was deeper. Overview of H13556 junction surveys file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_junctions.jpg H13025 20000 2018 NOAA Ship Rainier W Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13556 and the surface from H13025. The statistical analysis of the difference surface shows a mean of 0.06 meters with 95% of the nodes having a maximum deviation of +/- 0.33. It was found that 99.5+% of nodes are within NOAA allowable uncertainty. Difference surface between H13556 (grey) and junctioning survey H13025 (pink). file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Difference_surfaces.jpg Difference surface statistics between H13556 and H13025. file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Difference_surfaces_stats.jpg H13208 20000 2019 NOAA Ship Fairweather N Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13556 and the surface from H13208. The statistical analysis of the difference surface shows a mean of -0.12 meters with 95% of the nodes having a maximum deviation of +/- 0.97. It was found that 99.5+% of nodes are within NOAA allowable uncertainty. Difference between H13556 (grey) and junctioning survey H13208 (blue). file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Difference_surfaces1.jpg Difference surface statistics between H13556 and H13208 file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Difference_surfaces1_stats.jpg H13088 20000 2017 NOAA Ship Rainier N Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13556 and the surface from H13088. The statistical analysis of the difference surface shows a mean of 0.13 meters with 95% of the nodes having a maximum deviation of +/- 0.33. It was found that 99.5+% of nodes are within NOAA allowable uncertainty. Difference between H13556 (grey) and junctioning survey H13088 (green). file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Difference_surfaces2.jpg Difference surface statistics between H13556 and H13088. file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_Difference_surfaces2_stats.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. MVP casts on S220 were conducted at an average interval of 4 hours as recommended by CastTime analysis in Sound Speed Manager, which determines optimum cast frequency based on the observed sound speed variations from previous casts. MVP cast locations of H13556 file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_MPC_casts.jpg All equipment and survey methods were used as detailed in the DAPR. Holidays H13665 data were reviewed in CARIS HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the HSSD. Zero holidays were identified via HydrOffice QC Tools Holiday Finder tool. 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. NOAA Allowable Uncertainty 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 H13556. H13556 allowable uncertainty statistics file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_uncert_standars.jpg Density The surface was analyzed using the HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Density requirements for H13556 were achieved with at least 99.5+% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3 H13556 data density statistics file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_data_density.jpg All data reduction procedures conform to those detailed in the DAPR. All sounding systems were calibrated as detailed in the DAPR. All equipment and survey methods were used as detailed in the DAPR.Raw backscatter data were stored in the .all file for Kongsberg systems. All backscatter were processed to GSF files and a floating point mosaic was created by the field unit via Fledermaus FMGT 7.10.2 . See figure below for a greyscale representation of the complete mosaic. Backscatter Mosaic for H13556 file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_backscatter_mosaic.jpg CARIS HIPS and SIPS 11.4 QPS Fledermaus 7.10.2 NOAA Profile Version 2022 H13556_MB_VR_MLLW CARIS VR Surface (CUBE) Variable Resolution 42.72 200.053 NOAA_VR Complete MBES H13556_MB_VR_MLLW_Final CARIS VR Surface (CUBE) Variable Resolution 42.178 200.053 NOAA_VR Complete MBES The NOAA CUBE parameters defined in the HSSD were used for the creation of all CUBE surfaces for H13556. 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 vary from 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 47 flagged fliers, were deemed to be valid aspects of the surface. Fliers deemed to be valid aspects of the surface for H13556 file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_fliers.jpg Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR. Mean Lower Low Water ERS via VDATUM VDatum_CINMS_100m_NAD83-MLLW_geoid12b ERS methods were used as the final means of reducing H13556 to MLLW for submission. North American Datum 1983 Projected UTM 11 RTX Vessel kinematic data were post-processed using Applanix POSPac processing software and RTX positioning methods described in the DAPR. Smoothed Best Estimate of Trajectory (SBET) and associated error (RMS) data were applied to all MBES data in CARIS HIPS and SIPS. The Wide Area Augmentation System (WAAS) was used for real-time horizontal control during data acquisition. During real-time acquisition, all platforms received correctors from the Wide Area Augmentation System (WAAS) for increased accuracies similar to USCG DGPS stations. WAAS and SBETs were the sole methods of positioning for H13556, as no DGPS stations were available for real-time horizontal control. Chart comparison between ENC and soundings from collected data Suvey outline with soundings in blue overlayed on ENC US3CA69M file:///M:/OPRL397FA22/Surveys/H13556/01_HDR/Reports/Descriptive_Report/Components/H13556_soundings.jpg US3CA69M 232188 28 2022-01-18 2022-08-18 US5CA66M 40000 12 2022-03-29 2022-08-18 No shoals or potentially hazardous features exist for this survey. No charted features exist for this survey. No uncharted features exist for this survey. No channels exist within the survey limits. No Aids to navigation (ATONs) exist for this survey. No Maritime Boundary Points were assigned for this survey. No bottom samples were required for this survey. No overhead features exist for this survey. No submarine features exist for this survey. No platforms exist for this survey. No ferry routes or terminals exist for this survey. 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. CDR Meghan Mcgovern Commanding Officer 2023-04-07 LT Michael Card Operations Officer 2023-04-07 HST Sara Ober Sheet Manager 2023-04-07