S-X913-NRTNL-22 Vicinity of Thunder Bay Island Lake Huron NOAA NRT-New London H13652 1 North of Thunder Bay Island Michigan United States 20000 2022 LTJG Nicholas Azzopardi Navigable Area 2022-06-30 2022-06-16 2022-07-18 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 17N, LWD. 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 is located east of Alpena, Michigan and north of Sugar Island and Thunder Bay Island. 45.154367 83.305602 45.047691 83.202647 Survey limits were acquired in accordance with the requirements in the Project Instructions and the HSSD. There are 87 fliers and 9 holidays identified by Pydroexplorer's QC Tools. All fliers and holidays found were located along the edges of the sheet and were found to be either false or not navigationally significant. This request is in support of NOAA's Office of Coast Survey, Thunder Bay National Marine Sanctuary and the Great Lakes Environmental Research Lab for a hydrographic survey for the area North of Thunder Bay Island. This area is heavily trafficked by commercial and recreational vessels, so marine commerce is economically vital for the region. The primary purpose of this project is to provide contemporary hydrographic data to update NOAA’s nautical charting products. Mapping data from this project will also be used to locate and assess cultural resources (primarily historic shipwrecks). The majority of the prior data in the project area was partial bottom coverage collected by the U.S. Army Corps of Engineers Lake Survey before 1974. The data from this project will provide modern bathymetry for updating National Ocean Service nautical charting products, improving the safety of maritime traffic and commerce as well as supporting the Lakebed 2030 global mapping initiative. 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. The Grid QC tool within QC Tools was used to analyze multibeam echosounder (MBES) data density. The MBES surface meets the HSSD data density requirement. Pydro derived histogram plot showing HSSD object detection compliance of H13652 MBES data within the 50cm CUBE surface. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/H13652_MB_50cm_LWD.QAv6.density.png All waters in survey area Object Detection Coverage (Refer to HSSD Section 5.2.2.2) Survey coverage was in accordance with the requirements listed above and in the HSSD. Survey coverage overlaid on ENC US4MI66M. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/Survey_Coverage_Overview.png S3007 0.0 623.31 0.0 0.0 0.0 0.0 0.0 20.06 0.0 0.0 623.31 0.0 0.0 0.0 0.0 0.0 20.06 0.0 3.22 0 0 0 0 10.9 2022-06-16 2022-06-17 2022-06-19 2022-06-21 2022-06-22 2022-06-23 2022-06-24 2022-06-25 2022-06-26 2022-06-28 2022-06-29 2022-07-06 2022-07-07 2022-07-10 2022-07-12 2022-07-18 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. S3007 10.38 0.6 NRT-NL vessel S3007 with NYC in background. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/S3007_NYC.jpg MBES Kongsberg Maritime EM 2040C Conductivity, Temperature, and Depth Sensor YSI CastAway-CTD Positioning and Attitude System Applanix POS MV 320 v5 Sound Speed System AML Oceanographic SV-Xchange Multibeam crosslines acquired for this survey totaled 3.22% of mainscheme acquisition. A 4m CUBE surface was created using only mainscheme lines and a second 4m CUBE surface was created using only crosslines. These surfaces were then input into the Pydro Tool "Compare Grids". The comparison passed HSSD specifications. Pydro generated graph showing comparison between mainscheme and crosslines in H13652. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/MS_4m-XLs_4m_fracAllowErr_Freq.png ERS via VDATUM 0.0 0.045 S3007 2 0 0 0.5 Total Propagated Uncertainty (TPU) values for H13652 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 units in the Project Instructions. A visual inspection of the Uncertainty layer revealed the areas of higher uncertainty occur in the outer beams, and a visual inspection of the Density layer revealed the areas of lowest density are in the deepest areas of the survey and directly at nadir. In addition to the usual a priori estimates of uncertainty, some real time and post processed uncertainty sources were also incorporated into the depth estimates of the survey. Real-time uncertainties from the Kongsberg MBES sonars were incorporated and applied during post processing. Uncertainties associated with vessel roll, pitch, gyro, navigation, and heave were applied during post-processing. All of the aforementioned uncertainties were applied in CARIS. As stated, H13652 is an ellipsoidally referenced survey (ERS) and the tidal component was accomplished with a separation model. H13652 junctions with one survey, H12964. A surface from each survey was run through Compare Grids within Pydro Explorer to create a difference surface. This surface was also visually inspected to notice any large differences between the surveys. H12964 40000 2017 NOAA R/V Storm E Overlap with survey H12964 was approximately 7km long and 200m wide, with depths between 8 to 15 meters. Analysis of the difference surface indicated a mean difference of 0.01m, and a one standard deviation of 0.10m. Over 99.5% of nodes pass IHO specifications. Overview of H13652 (blue) and H12964 (red) and their overlap (black). file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/Junction_Overview.png Comparison Distribution graph between H13652 and H12964 showing 99.5% of nodes passed IHO specifications. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/H13652_MB_50cm_LWD-H12964_MB_1m_LWD_1of1_fracAllowErr_Freq.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. None Exist There were no other factors that affected corrections to soundings. At least once every 4 hours. SVP casts were taken at least once every four hours in the deepest water nearest to the survey area being worked on. The SVP casts were applied to the MBES lines in CARIS using the "nearest in distance within time of 4 hours" method. All equipment and survey methods were used as detailed in the DAPR. 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. NOAA Profile Version 2022 H13652_MB_50cm_LWD.csar CARIS Raster Surface (CUBE) 0.5 1.319 16.97 NOAA_0.5m Object Detection H13652_MB_50cm_LWD_Final.csar CARIS Raster Surface (CUBE) 0.5 1.319 16.97 NOAA_0.5m Object Detection Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR. Low Water Datum IGLD-1985 ERS via VDATUM S-X913-NRTNL-22_VDatum_100m_NAD83-LWD_IGLD85_geoid12b.csar North American Datum 1983 (2011) Projected UTM 17 Smart Base DRUMMOND ISLAND MIDI INDIAN RIVER MIND TAWAS CITY MITW ALPENA NOR3 GODERICH GOD2 MIAL ALPENA MIAL The Wide Area Augmentation System (WAAS) was used for real-time horizontal control during data acquisition. US4MI66M 60000 11 2022-03-31 2022-03-31 No shoals or potentially hazardous features exist for this survey. All charted features are discussed in the FFF. Charted soundings and H13652 soundings generally agree in value. Charted soundings (white) and H13652 soundings (black) are similar. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/Soundings_Comparison.png Net stakes that were not charted correctly have been added to the FFF. It is the recommendation of the survey team to not add these features to the chart as they aren't navigationally significant and clutter the chart. 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. There is evidence of historic scours along the seafloor that are now starting to get covered up by other geologic features. Multiple scours along seafloor partially covered by a geologic feature. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/Drag_1.png Another scour partially covered by a geologic feature. file:///E:/H13652/01_HDR/Reports/Descriptive_Report/DR_Images/Drag_2.png 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. LTJG Nicholas Azzopardi Chief of Party 2022-10-24 PST Michael Bloom Sheet Manager 2022-10-24