OPR-G380-TJ-15Approaches to CharlestonSouth East Atlantic OceanNOAA Ship Thomas JeffersonH1277312N/A8 NM Southeast of Charleston Harbor Channel BuoySouth CarolinaUnited States200002015Captain Shepard M. Smith, NOAANavigable Area2015-04-092015-10-222015-10-30Multibeam Echo SounderSide Scan SonarmetersUniversal Transverse Mercator (UTM)UTCAtlantic Hydrographic BranchNOAAH12773 is in the proximity of the approaches to Charleston harbor located approximately 12 NM Southeast of Charleston Harbor. Figure 1 shows the general locality of the survey data submitted in correlation with survey H12773.32.610439444479.494484722232.508274166779.3620844444H12773 survey limits plotted over RNC 11528file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773-MAP_New_1.jpgSurvey limits were acquired in accordance with the requirements in the Project Instructions and the HSSD.This project is being conducted in support of NOAA's Office of Coast Survey to provide contemporary hydrographic data in support of a new nautical chart in this area and in response to a harbor deepening project in the Port of Charleston which will better serve deeper draft ships transiting the area. This project was identified as priority 1 in the Project Instructions. The entire survey is adequate to supersede previous data.Although no holidays exists within the survey data, small surface sound velocity busts occurred on several lines due to adverse environmental conditions during survey operations. There was an ERS bust on line XL_295_907_1601 which necessitated a re-run of the line resulting in line XL_303_647_0548. A surface comparison using the two crosslines showed no significant improvement in the quality of the line. Another anomaly was discovered in DN 297 on lines 297_148_1615 and 297_148_1635. It was discovered during processing that a vertical offsets of 50cm occurred at some points between these lines and crosslines and may probably be due to ERS busts. No significant features are associated with the ERS bust or in the SSS. Survey still meets specifications. A scour area was discovered during processing. A least depth of 21.94 was determined and included as a designated sounding. No splits were run to develop the area further.H12773 - SV Busts depicted in green boxfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/sv%20busts.jpgERS Bust - XL_295_907_1601 shown in Node Std Dev layerfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/ERS%20BUST.jpgERS Bust - 297_148_1615file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/ERS_DN_297_148.jpgScour Area - Line 296_124_2113file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/image%20(2).pngCoverage were acquired in accordance with Project Instructions and HSSD; the field unit chose to meet coverage requirements by means of 100% SSS with concurrent MBES and backscatter.H12773 MBES COVERAGE file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773-COVERAGE_New_1.jpgS222015.3000494.5070.30015.3000494.5070.3014.20000052.592015-10-222015-10-232015-10-242015-10-252015-10-292015-11-30Refer 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.S22220815NOAA Ship Thomas Jefferson acquired multibeam soundings and backscatter data. The Ship also collected side scan sonar imagery, sound velocity profiles, surface sound velocity readings and attitude and position data.RESON7125 SV2MBESRESONSVP 70SOUND SPEEDRESON7125 ROVMBESKLEIN5000 V2SSSAPPLANIXPOS MV v 5POSITIONING & ATTITUDETRIMBLESPS 351POSITIONINGROLLS ROYCE-BROOKE OCEAN TECHNOLOGIESMOVING VESSEL PROFILER 100SOUND SPEEDAML OCEANOGRAPHICAML SMART SV & P PROBESOUND SPEEDTotal Crosslines acquired during survey made up approximately 14.2% of total mainscheme lines. NOAA Ship Thomas Jefferson acquired 70.3 linear nautical miles of MBES crosslines which translated to 14.2% of mainscheme MBES data acquired.A statistical comparison analysis using Caris HIPS/SIPS was made using the difference between the 1m mainscheme and crossline grids. Out of 3,848,470 nodes, there was an observed mean of 0.034m and a standard deviation of 0.154m. Based on the percentage of crosslines and the statistical difference, H12773 is in compliance with section 5.2.4.3 of the HSSD (2015 ed). H12773_XL_MS_Differencefile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/MS_XL_Statistics.JPG0.00.125S222410.2Uncertainty Standards were calculated using the Pydro64 (v5092) Contribs "Finalized CSAR QA" script. Results are listed: H12773 has > 99.99% nodes with uncertainty less than IHO error. 72,694,311 nodes passed out of 72,694,557 total nodes. Object Detection Coverage was calculated using the Pydro64 (v5092) Contribs "Finalized CSAR QA" script. Results are listed: H12773 has 99.40% nodes with uncertainty less than IHO error. 72,226,826 nodes passed out of 72,694,557 total nodes. Total Propagated Uncertainty values for survey H12773 were derived using a combination of real time uncertainties for vessel motion, a priori of values for equipment and vessel characteristics, assigned values for tidal datum uncertainties, and field assigned values for sound speed uncertainties. The realtime uncertainties for vessel motion include roll, pitch, gyro, navigation, and elevation. The uncertainties in these measurements were recorded as part of the POSPac 5P ERS solution and were applied to the soundings via an SBET RMS file generated by Applanix POSPac per Chapter 3.4.2.1.1 of the NOAA Field Procedures Manual (2014 ed). The NOAA ship THOMAS JEFFERSON employed a subscription service, "Marinestar", to generate real-time correctors for position and vertical heights broadcast over the L-Band from a geosynchronous orbital satellite. Uncertainties for sonar mounting and vessel speed were assigned using the a priori values found in Chapter 4 of the NOAA Field Procedures Manual (2014 ed). These values were applied to the data via the CARIS HIPS Hydrographic Vessel File. The uncertainty associated with sound speed measurements were based on the frequency and location of CTD and MVP casts in accordance with Appendix 4 of the FPM (2014 ed). Plot showing Uncertainty Standardsfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_MB_1m_MLLW_FINAL_TVU_QC.pngPlot showing Object Deterction Coveragefile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_MB_1m_MLLW_FINAL_Density.pngFive concurrent surveys were acquired during the same relative time frame of acquisition of H12773. H12767; H12804; H12766; H12795; H12769 Depth comparisons were made using a CARIS HIPS generated difference surface as a check that the sonar systems and application of correctors were in agreement. H12773 Survey junction comparison with adjoinging sheetsfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/junction%20sheets.jpgH12767200002015NOAA Ship Thomas JeffersonNThe difference between survey H12773 and the junction survey H12767 ranged from -0.406m to 0.515m. The mean was 0.092m and the standard deviation was 0.109m. Out of a total of 287588 nodes, 283080 fell within 0.3m of the surface, which is 98%. H12773 & H12767 Junction Statisticsfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_H12767.JPGH12766200002015NOAA Ship Thomas JeffersonWThe difference between survey H12773 and the junction survey H12766 ranged from -0.295m to 0.425m. The mean was 0.095 and the standard deviation was 0.089m. Out of a total of 347863 nodes, 342258 agreed within 0.3m of the surface, which is approximately 98%H12773 & H12766 Junction Statistics.file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_H12766.jpgH12769200002015NOAA Ship Thomas JeffersonSWThe difference between survey H12773 and the junction survey H12769 ranged from -0.834m to 0.717m. . The mean was 0.095 and the standard deviation was 0.141m. Out of a total of 357018 nodes , 328901 fell within 0.3m of the surface which is 92%H12773 & H12769 Junction Statistics.file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_H12769.JPGH12804200002015NOAA Ship Thomas JeffersonNWThe difference between survey H12773 and the junction survey H12804 ranged from -0.308m to 0.353m. . The mean was 0.037 and the standard deviation was 0.109m. Out of a total of 221077 nodes , 219798 fell within 0.3m of the surface which is 99.4%H12773 & H12804 Junction Statistics.file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_H12804.jpgH12795200002015NOAA Ship Thomas JeffersonNWThe difference between survey H12773 and the junction survey H128795 ranged from -0.341m to 0.345m. . The mean was -0.006 and the standard deviation was 0.131m. Out of a total of 83855 nodes , 83662 fell within 0.3m of the surface which is 99.8%H12773 & H12795 Junction Statistics.file:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_H12795.jpgSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.None ExistThere were no other factors that affected corrections to soundings.Sound speed profiles were measured in accordance with the HSSD (2015 ed.) on Thomas Jefferson (S222) using the Rolls Royce-Brooke-Ocean MVP 100 approximately every 30 minutes to one hour and were evenly distributed spatially throughout the survey area. All MVP casts were concatenated into one sheet wide sound velocity file and applied to multibeam data in CARIS using nearest in distance within a time of 1 hour. The results showed the water column to be well mixed with minimal variance over space and time. H12773 Spatial distribution of Sound Speed Castsfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/Sound%20speed%20casts.jpgAll equipment and survey methods were used as detailed in the DAPR.H12773 Density ComplianceDensity requirements for H12773 were analyzed using the finalized CSAR QA tool in the Pydro Contributions program. The Chief Hydrographer chose to exceed the specifications for complete coverage with set line spacing because density requirements were met and bathymetry was better represented using a 1m resolution. The 1 meter surface meets density 99.4% of the time.Object Detecton Coveragefile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_MB_1m_MLLW_FINAL_Density.pngAll data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Merge and TideThe entire survey has both Discrete Zoning Observed tides and ERS Post Processed Precise Point Positioning (5P) with separation model (GPS Tide) loaded to the data. GPS tide was chosen as the merge option and was the datum of choice for this survey.Backscatter was logged as a 7k file and submitted to the Atlantic Hydrographic Branch for processing. One line per vessel, per day was processed aboard the Thomas Jefferson in order to assess and ensure quality. No deficiencies were noted.CarisHIPS/SIPS9.0.192015-09-03ProcessingCarisBathy DataBASE4.1.32015-10-15ProcessingNOAAPydro14.6R53582015-11-09ProcessingApplanixPosPAC7.0.5637.2170822015-06-05ProcessingNOAA Profile V 5.3.3H12773_SSS_100SSS Mosaic100N/A100% SSSH12773_MB_1m_MLLWCUBE117.9829.54NOAA_1mMBES TracklineSBES Set Line SpacingH12773_MB_1m_MLLW_FinalCUBE117.8829.54NOAA_1mMBES TracklineSBES Set Line SpacingData Fliers in MB DataA swath filter was applied to the data to remove sonar side lobe anomalies in the RESON SV2 system. The filter used logic that rejected bathymetric data points beyond 60 degrees on either side of nadir. The filter was only applied to cross lines. All other erroneous data was manually rejected by the hydrographer during normal data processing and editing.Rejected Outer beams on crosslinesfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/outerbeams%20cut.jpgTotal Vertical Uncertainty AnalysisA custom layer was created for the finalized surface submitted in correlation with survey H12773. The layer was derived from the difference between the calculated uncertainties of individual nodes and the allowable uncertainty at the coupled node. This layer was examined using the CARIS QC report tool. The resulting statistical analysis identified greater than 99.9% of nodes within H12773 met the vertical uncertainty standards of Section 5.1.3 of the 2015 HSSD. No SBET data was interpolated.All vertical and horizontal control activities conducted during the course of this survey are fully addressed in the following sections. Per section 5.1.2.3 of the FPM (2014 ed), no Horizontal and Vertical Control Report has been generated for survey H12773. Mean Lower Low WaterVDatum2015_G380_VDatum_NAD83_MLLW_rev2.csarAll soundings submitted as H12773 are reduced to MLLW using documented VDatum techniques. If it is deemed necessary to change the water level reduction method to discrete zoning the following additional information will be useful: 1) The National Water Level Observation Network (NWLON) stations serving as datum control for this survey is Charleston, SC (8665530). 2) The submitted water level files (8665530_Verified.tid) are the final approved water levels for the period of hydrography. These files have been loaded to all CARIS lines submitted as H12773. 3) The submitted tide corrector (G380TJ2015CORP.zdf) is the preliminary zoning file that was accepted as final per final tide note, submitted in Appendix I. This file has been loaded to all CARIS lines submitted as H12773. 4) A request for final approved tides was sent to COOPS on 07 Nov 2015. North American Datum of 1983 (NAD83)17 NorthThe projection used for this project is UTM zone 17 north. Additional information discussing the use of 5P for this survey can be found in the accompanying DAPR.Chart comparison procedures were followed as outlined in section 4.5 of the FPM (2014 ed) and section 8.1.4 sub section D.1 of the HSSD (2015 ed). The ENC and RNC versions of the relevant charts were reviewed to ensure that the latest USCG Local Notice to Mariners (LNM) has been applied. Chart comparisons for survey H12773 were conducted using a selected sounding set over plot removed to a map scale of 1:40000. In CARIS BDB, the soundings were then converted into a point cloud, from which a 1m interpolated surface was generated. Contouring was run on the interpolated surface and the results are listed below.115282574000012014-072015-09-242015-07-25Survey H12773 generally aligned well with existing depth soundings on the 11528 RNC to within 2 feet. H12773 contours generated show a shift from those on the 11528 RNC. Sounding comparison of the Fish Haven showed depths shoaler than the charted minimum of 67 ft and should be updated to reflect the new controlling depth of at least 63ft.The Hydrographer recommends updating all contours and soundings with the digital data from survey H12773.H12773 RNC Comparisonfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/Sounding_Comparison.jpgH12773 Fish Haven Analysisfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/Fish_Haven_Analysis.jpgH12773 ENC Contour Comparisonfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/contour%20comparison.jpgUS5SC25M4000012014-10-062015-10-06falseENC US5SC25M coincides with 11528 RNC, with the depths and contours matching up closely. The comparison between survey H12773 and the ENC is therefore equivalent to the preceding comparison with Chart 11528. The Hydrographer recommends updating all contours and soundings with the digital data from survey H12773. H12773 ENC Sounding Comparisonfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/H12773_ENC_Soundings.jpgNo AWOIS items were assigned for this survey.No Maritime Boundary Points were assigned for this survey.No charted features exist for this survey.No uncharted features exist for this survey.No Danger to Navigation Reports were submitted for this survey.No shoals or potentially hazardous features exist for this survey.No channels exist for this survey. There are no designated anchorages, precautionary areas, safety fairways, traffic separation schemes, pilot boarding areas, or channel and range lines within the survey limits.No bottom samples were required for this survey.Shoreline was not assigned in the Hydrographic Survey Project Instructions or Statement of Work.Prior survey comparisons exist for this survey, but were not investigated.No Aids to navigation (ATONs) exist for this survey.No overhead features exist for this survey.No submarine features exist for this survey.No ferry routes or terminals exist for this survey.No platforms exist for this survey.A feature of significance was located at coordinates; 32-35-08.95N, 079-29-29.06W. Feature was determined to have a least depth of 16.993m above the seabed. Due to the buried nature of the feature, it is estimated to have been underwater for a long time.H12773 Underwater Featurefile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/feature_surface.jpgH12773 Underwater Feature Least Depthfile:///H:/Surveys/OPR-G380-TJ-15/H12773/Separates/least%20depth%20pic.jpgNo present or planned construction or dredging exist within the survey limits.No new surveys or further investigations are recommended for this area.No new insets 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 and Specifications Deliverables Manual, 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.Shepard M. Smith, CAPT/NOAAChief of Party2015-11-12Joseph K. Carrier, LT/NOAAField Operations Officer2015-11-12Uchechukwu K. Erege, Sub-Lt/Nigeria NavySheet Manager2015-11-12