OPR-B342-KR-24 Long Island Sound Long Island Sound Ocean Surveys H13929 4 Seven Miles North of Wildwood New York United States 10000 2024 John R. Bean Navigable Area 2024-05-06 2024-08-19 2024-09-27 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 18N, 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 in Long Island Sound, NY. The general locations of the survey limits are presented in Table 1. 41.028375 41.125508333333336 72.95014722222223 72.74483888888889 Survey limits were acquired in accordance with the requirements in the Project Instructions and the HSSD. High resolution bathymetry and backscatter acquired in this survey will help with the identification of existing geologic and benthic characteristics for hazard and habitat mapping. The data will support management decisions regarding the effects of potential energy infrastructure projects and mitigation opportunities, including the Offshore Wind Cable Corridor Constraints Assessment being conducted by the New York State Energy Research Development Authority (NYSERDA). This effort was made possible through a partnership with NOAA and the State of Connecticut Department of Energy and Environmental Protection (CTDEEP) through the FY24 Brennan Matching Fund and Long Island Sound Research and Restoration Fund / Long Island Sound Cable Fund (LISCF). The members of the LISCF steering committee include representatives from CTDEEP, US EPA Regions 1 & 2 through the Long Island Sound Study, the New York Department of Environmental Conservation and Department of State, and both CT and NY Sea Grant offices. The efforts of this partnership will support habitat identification, resource management, and navigation of these important waterways. Data from this project will supersede all prior survey data, providing modern hydrographic survey data for this area and updating the local charting products. The entire survey is adequate to supersede previous data. All waters in survey area Complete Coverage (Refer to HSSD Section 5.2.2.3 Option A). Prioritize backscatter quality. Survey coverage was in accordance with the requirements listed above and in the HSSD. Project OPR-B342-KR-24 coverage with H13929 emphasized. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929-Overview.jpg RV North Cove 0.0 626.1 0.0 0.0 0.0 0.0 0.0 29.9 0.0 0.0 626.1 0.0 0.0 0.0 0.0 0.0 29.9 0.0 4.8 2 0 0 0 29.8 2024-08-19 2024-08-21 2024-08-22 2024-08-23 2024-08-24 2024-08-25 2024-08-26 2024-08-27 2024-08-28 2024-09-03 2024-09-04 2024-09-12 2024-09-27 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 North Cove configured for survey operations. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/NC-overview.png MBES Teledyne RESON SeaBat T50-R Positioning and Attitude System Applanix POS MV 320 v5 Positioning System Trimble NetR9 Sound Speed System AML Oceanographic Micro SV-Xchange Conductivity, Temperature, and Depth Sensor AML Oceanographic AML-3 LGR Crossline mileage in H13929 totaled 4.8% of the mainscheme survey miles. Agreement between crosslines and mainscheme bathymetry was very good, with a mean difference of 0.0m in the 2m resolution surface. Crossline tracks overlaid on a coverage surface. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929-XL.jpg Depth differences between mainscheme and crossline data. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13927_MB_2m_Main-H13927_MB_2m_XL_depth_delta.png ERS via VDATUM 7.91 RV North Cove 2 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 specification. A 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 99.5+% of nodes meeting the uncertainty standards. Uncertainty standards. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929_MB_2m_MLLW_Final.GQv6.tvu_qc.png No prior junctions were assigned for Project OPR-B342-KR-24. One current survey junctions with the eastern border of H13929. H13929 junction map with junction area depth differences. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929-Junction.jpg H13928 10000 2024 OSI E This junction is discussed in the H13928 DR. 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. RV North Cove acquired AML3 casts at intervals of approximately 60 minutes. 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 a data package titled "SOUND VELOCITY collected from RV North Cove, RV South Cove, and RV West Cove II in North Atlantic Ocean, Long Island Sound from 2024-06-20 to 2024-09-27" in NetCDF format to the National Centers for Environmental Information (NCEI) on October 22, 2024. H13929 sound speed cast locations. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929-SVP.jpg This survey was conducted to achieve Complete Coverage with multibeam, as specified in HSSD 5.2.2.3, Option A. 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 multibeam data met the density coverage requirements, with 99.5+% of the grid nodes populated with at least 5 soundings. The only surface submitted for this survey is of 2m resolution, which is appropriate for the depth of the seafloor as surveyed. In the finalized surface, the designated shoal sounding on a single tall feature is preserved, causing the minimum depth of the finalized surface to be shoaler than the specified depth range for a 2m resolution surface. Data density, 2m resolution surface. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929_MB_2m_MLLW_Final.GQv6.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. H13929 multibeam backscatter mosaic. file:///H:/OPR-B342-KR-24/Surveys/H13929/01_HDR/Reports/Descriptive_Report/SupportFiles/H13929-Backscatter.jpg NOAA Profile Version 2023 H13929_MB_2m_MLLW_Final CARIS Raster Surface (CUBE) 2 15.0 39.6 NOAA_2m Complete MBES H13929_MB_2m_MLLW CARIS Raster Surface (CUBE) 2 25.4 39.6 NOAA_2m Complete MBES H13929_MBAB_2m_400kHz_1of1 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-B342-KR-24_100m_NAD83_2011-MLLW_geoid18.csar North American Datum 1983 (2011) Projected UTM 18 Smart Base BROOKFIELD CTBK DARIEN CTDA GROTON CTGR GUILFORD CTGU MANSFIELD CTMA PAQUETTE CTNE NEPTUNE TOWNSHIP NJNT CENTRAL ISLIP NYCI LAKE CARMEL NYLC NEWBURGH NYNB VALHALLA NYVH NEW YORK WAAS 1 ZNY1 Ocean Surveys Connecticut OSCT US5CT1CL 20000 2 2021-11-04 2021-11-04 US5CT1CM 20000 2 2021-11-04 2021-11-04 US5NY9HR 20000 2 2021-09-28 2021-09-28 US5NY9HS 20000 2 2021-10-28 2021-10-28 US5NY9HT 20000 2 2021-11-08 2021-11-08 No shoals or potentially hazardous features exist for this survey. The charted features assigned in H13929 were 2 wrecks, both of which were found and included as new area features due to their size. There were 2 new obstructions, 1 new wreck, and 2 possible buried wrecks surveyed in H13929. See the FFF for details. 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. Bottom sample locations for this project were selected based on the processed backscatter. Survey H13929 had 2 locations sampled, and both samples were primarily mud. See the FFF for details and photos. No overhead features exist for this survey. There are 2 charted cables and 1 cable area crossing H13929. The FA-1 (FLAG Atlantic 1) transatlantic submarine cable crosses the survey area in an east-west direction and the Cross-Sound Cable, an electric transmission cable, crosses the survey area in a N-S direction. A cable area for the MCI fiber optic cable crosses diagonally through the survey in the eastern end. The FA-1 and the Cross-Sound Cable each had a linear depression observed along their charted paths, measuring 1km and 500m long respectively. No other evidence of submarine cables was observed in the survey area. 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. John R. Bean Chief of Party 2024-12-06 David T. Somers Data Processing Manager 2024-12-06