OPR-B315-KR-22 Approaches to Newport, RI Rhode Island Sound Ocean Surveys H13660 4 South of Sakonnet River Rhode Island United States 20000 2022 John R. Bean Navigable Area 2022-06-13 2022-07-13 2022-08-26 Multibeam Echo Sounder Multibeam Echo Sounder Backscatter meters UTC Atlantic 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 19N, 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 Contractors) CC0-1.0 https://creativecommons.org/publicdomain/zero/1.0/ https://creativecommons.org/publicdomain/zero/1.0/legalcode These data were produced under contract with NOAA and any potential copyright was assigned to NOAA. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0). Contractor This survey provides hydrographic data for waters approaching Newport, RI. The general locations of the survey limits are presented in Table 1. 41.528914 71.249545 41.447993999999994 71.191317 Survey limits were acquired in accordance with the requirements in the Project Instructions and the HSSD. The following text is quoted from the Purpose and Location section of the Project Instructions: The Approaches to Newport, RI project covers an area of 210 Square Nautical Miles (SNM), that connects Narragansett Bay, Block Island Sound, Buzzards Bay, and Vineyard Sound. This survey area serves as a major route for cargo, tanker, recreational and commercial fishing, and pleasure vessels transiting through the area. The Ports of Davisville, Providence, and New Bedford, are some of the busiest ports in New England serving international and domestic trade. These ports support automotive transportation, seafood and other cold storage, petroleum products, and construction materials and equipment. Commercial fishing, transportation and recreation are major activities in the area, with the Port of Galilee in Narragansett serving as the home port for many charter fishing vessels and sightseeing tours. Additionally, it serves as a major hub for year round ferry service to Block Island providing an essential transportation link to the island and the community of New Shoreham. The Cities of Newport, Wickford, Warwick and other cities in the vicinity of the survey area are well known for their sailing and recreational boating activities. Events such as the annual Newport Regatta bring national and international recognition for the competitive sailing that takes place in the area. The available bathymetric data in the survey area is almost all over a century old, with the most recent survey conducted in the 1930's. The bathymetric and feature data acquired as part of this project will be used to update National Ocean Service nautical charting products and services as well as support the Seabed 2030 global initiative. The 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. All waters in survey area Complete Coverage (Refer to HSSD Section 5.2.2.3) Survey coverage was in accordance with the requirements listed above and in the HSSD. Survey H13660 coverage overlaid on a composite of RNCs. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660-overview.JPG RV North Cove 0.0 254.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 RV South Cove 0.0 311.7 0.0 0.0 0.0 0.0 0.0 23.5 0.0 0.0 566.6 0.0 0.0 0.0 0.0 0.0 23.5 0.0 4.1 2 0 0 0 7.42 2022-07-13 2022-07-19 2022-07-20 2022-07-21 2022-07-22 2022-07-24 2022-07-27 2022-08-02 2022-08-03 2022-08-04 2022-08-05 2022-08-06 2022-08-10 2022-08-14 2022-08-15 2022-08-16 2022-08-18 2022-08-20 2022-08-23 2022-08-24 2022-08-26 Refer 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. RV North Cove 11.1 0.8 RV South Cove 9.4 0.8 RV North Cove configured for survey operations. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/NC_overview.jpg RV South Cove configured for survey operations. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/SC_overview.jpg MBES Teledyne RESON SeaBat T50-R Positioning and Attitude System Applanix POS MV 320 v5 Positioning System Trimble NetR9 Conductivity, Temperature, and Depth Sensor AML Oceanographic AML-3 LGR Sound Speed System AML Oceanographic Micro SV-Xchange Lidar System Velodyne LiDAR VLP-16 Crossline mileage in Survey H13660 totaled 4.1% of the mainscheme survey miles. Agreement between crosslines and mainscheme bathymetry was very good, with a mean difference of 0.02m. Most discrepancies were found atop individual rocks or on the edges of the crosslines, in outer beam data. H13660 cross line tracks overlaid on a coverage surface. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660-XL.JPG Depth differences between H13660 mainscheme and crossline data. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660_MB_2m_MLLW_Main-H13660_MB_2m_MLLW_XL_depth_delta.png ERS via VDATUM 0.0 0.104 RV North Cove 2 N/A N/A 1 RV South Cove 2 N/A N/A 1 The HydrOffice "QC Tools" application was used to calculate TVU QC, determined by a ratio of uncertainty to the allowable error per NOAA and IHO specifications. A 1m resolution surface was finalized in CARIS HIPS using the "uncertainty" option to select the combination of a priori and realtime uncertainty estimates as the surface TVU source. The surface passed the uncertainty check, with 100% of nodes meeting the uncertainty standards. H13660 MBES 1m surface uncertainty standards. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660_MB_1m_MLLW_Final.QAv6.tvu_qc.png Survey H13660 junctions with 1 contemporary survey. Survey H13660 junction map with junction area depth differences. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660-Junction.JPG H13659 10000 2022 Ocean Surveys, Inc. S The shared border between Surveys H13660 and H13659 is approximately 4.9km long and runs the length of the southern edge of Survey H13660. The junction area includes a wreck DTON submitted for Survey H13659. The mean depth difference between the two surveys was 0.01m with most discrepancies found in the rocky areas at both shoreline edges, or in outer beam data. The survey junction comparison from the HydrOffice "Compare Grids" tool calculated that 99.5+% of comparison nodes were within the allowable error fraction. Depth differences between Surveys H13659 and H13660. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13659_MB_1m_MLLW-H13660_MB_1m_MLLW_depth_delta.png 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. Sound Speed Variation Sound speed variations were observed throughout the survey area, correlating to factors including the tide, weather, water depth, and bathymetric features, such as slopes or sand waves. In data processing, sound speed profiles that did not adequately reflect the surrounding water mass were identified and removed, edited, or replaced. Sound speed casts were primarily applied using the CARIS HIPS "Nearest in Distance within Time" method, therefore, removing a profile collected on a steep slope would allow deeper and shoaler casts on either side to be applied instead. Casts that were empirically found to represent a large water zone were added at additional locations within that zone to ensure proper corrections given the cast selection options available in the CARIS sound speed tools. Bathymetry, uncertainty, and standard deviation surfaces were used to direct editing and determine the accuracy of sound speed cast selection. AML-3 casts were taken approximately every 1-2 hours on the RV North Cove and RV South Cove. Hydrographers acquired more frequent sound speed profiles if high variability was noted in the surface sound speed from the AML Micro-X installed on the head of the transducer, or when the surface sound speed comparison threshold was exceeded (>2m/s change) between the profile reading at the draft of the transducer and the Micro-X. OSI submitted sound speed data in NetCDF format to the National Centers for Environmental Information (NCEI) on February 10, 2023 via the SN2 tool. Sound speed casts in Survey H13660. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660-SVP.JPG This survey was conducted to achieve Complete Coverage with multibeam, as specified in HSSD 5.2.2.3, Option A. This calls for 100% bathymetric bottom coverage with multibeam sonars, and complete coverage multibeam developments of features. The survey methods used to meet coverage requirements did not deviate from those described in the DAPR. The HydrOffice "QC Tools" application was used to verify that the grid nodes met the density coverage requirements, with 99.5+% of the nodes meeting the requirement. H13660 MBES 1m surface data density statistics. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660_MB_1m_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. All equipment and survey methods were used as detailed in the DAPR. Survey H13660 backscatter mosaic overlaid on a composite of RNCs. file:///Q:/OPR-B315-KR-22/Surveys/H13660/01_HDR/Reports/Descriptive_Report/SupportFiles/H13660-Backscatter.JPG NOAA Profile Version 2022 H13660_MB_1m_MLLW_Final.csar CARIS Raster Surface (CUBE) 1 -0.093 19.133 NOAA_1m Complete MBES H13660_MB_1m_MLLW.csar CARIS Raster Surface (CUBE) 1 -0.092 19.133 NOAA_1m Complete MBES H13660_MBAB_2m_400kHz_1of1.tif MB Backscatter Mosaic 2 N/A Processed Backscatter 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 OPR-B315-KR-22_VDATUM_Coverage_100m_NAD83-MHW_geoid12b.csar OPR-B315-KR-22_VDATUM_Coverage_100m_NAD83-MLLW_geoid12b.csar North American Datum 1983 Projected UTM 19 Smart Base DARTMOUTH MADA U OF RI COOP URIL MANT NANTUCKET MANT FALMOUTH MAFA MAWR WRENTHAM MAWR RIVERHEAD NYRH PLYMOUTH MAPL NEW YORK WAAS 1 ZNY1 Ocean Surveys Sachuset (Second) Beach OSSB US5PVDCF 20000 2 2022-11-21 2022-11-21 US5PVDDF 20000 2 2022-11-21 2022-11-21 A suspected floating fishing net was submitted as a DTON for Survey H13660. It has since been added to the chart. No other hazardous shoals or features were submitted for Survey H13660. A wreck DTON is present in the Survey H13660 data, but as it is outside the survey limits, it was addressed only in the adjacent Survey H13659. Charted features assigned in Survey H13660 included 27 land areas, 33 obstructions, and 171 underwater rocks. Over half of the assigned features were inshore of NALL and not addressed. All of the submerged rocks were adequately portrayed by the submitted bathymetry grid; baring/exposed rocks and land areas were surveyed and positioned with vessel mounted lidar. Charted obstructions were all area features; portions of these areas seaward of the NALL were surveyed and significant baring/exposed rocks were added to the FFF as separate features. Uncharted features in Survey H13660 primarily consisted of significant baring/exposed rocks and land areas which were surveyed and positioned by vessel mounted lidar. One new submerged obstruction was submitted as a DTON and has since been added to the chart. An uncharted wreck was also surveyed outside the survey limit and is addressed in Survey H13659. The Sakonnet Harbor Anchorage Channel was assigned in the CSF, and survey coverage was achieved up to (and varying distances past) the 3.5m contour NALL; however, the charted channel depth is 1.3m and beyond safe navigable limits for the survey vessels. The dredge area feature is not included in the FFF. See the submitted bathymetry grid for the completed coverage. ATONS in Survey H13660 included 3 buoys and 2 lights, a breakwater light and a beacon tower. All ATONS were surveyed to be on station and watching properly. No Maritime Boundary Points were assigned for this survey. Survey H13660 had 2 bottoms samples collected, both of which contained sand as the primary constituent. See the FFF for details. 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 in Survey H13660. 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. John R. Bean Chief of Party 2023-02-23 David T. Somers Data Processing Manager 2023-02-23