S-J924-NRT1-14Biloxi Bay and Approach, MSBiloxi, MSNavigation Response Team 1H127242Approach to Biloxi BayMississippiUnited States200002014Mark McMannNavigable Area2014-03-242014-10-282015-06-16Singlebeam Echo Sounder Multibeam Echo SounderSide Scan SonarmetersUniversal Transverse Mercator (UTM)UTC-6Pacific Hydrographic BranchThe purpose of this survey is to provide contemporary surveys to update National Ocean Service (NOS) nautical charts. All separates are filed with the hydrographic data. Any revisions to the Descriptive Report (DR) generated during office processing are shown in bold red italic text. The processing branch maintains the DR as a field unit product, therefore, all information and recommendations within the body of the DR are considered preliminary unless otherwise noted. The final disposition of surveyed features is represented in the OCS nautical chart update products. All pertinent records for this survey, including the DR, are archived at the National Centers for Envitronmental Information (NCEI) and can be retrieved via http://www.ncei.noaa.gov/. NOAAApproach to Biloxi Bay, MS30.372777777888.863333333330.180277777888.7233333333Survey LimitsSupportFiles\Survey_Limits_H12724_Biloxi.jpgSurvey Limits (general)SupportFiles\Survey_Limits_General_Biloxi.jpgSurvey Limits were acquired in accordance with the requirements in the Project Instructions and the HSSD.The Navigation Manager has received requests for a hydrographic survey in Biloxi Bay to investigate the depths of the navigable area and features near the channels.The entire survey is adequate to supersede previous data.Survey Coverage was in accordance with the requirements in the Project Instructions and the HSSD.Holidays due to lack of complete SBES were found in limited areas during office review.Survey CoverageSupportFiles\H12724_Survey_Coverage.jpg3001000000312.6918.150000000312.6918.15011.61900007.432014-10-282014-10-292014-11-192014-11-242014-12-022014-12-032014-12-042014-12-112015-12-172015-01-202015-02-112015-03-162015-03-172015-03-182015-03-242015-03-252015-03-312015-04-012015-04-072015-04-082015-04-202015-04-212015-04-272015-05-192015-06-16Percent of XL equals 5.8% of total 200% MS mileage. This does not meet the 10% requirement for cross lines, however they do serve their intended function.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.S30019.150.5Survey Vessel S3001 SchematicsSupportFiles\S3001schematics.jpgOdomCV200SBESReson8125MBESEdgetech4125SSSTrimble ApplanixPOS MV 5Positioning and Attitude SystemSontekCastawayConductivity, Temperature, and Depth SensorOdomDigibarSound Speed SystemX-lines equal 5.8% of total 200% main scheme mileage. The Cross line comparison shows excellent agreement with the Main scheme dataset. Additional Quality Control surface comparisons were done: Caris Base 'Compute Statistics' comparison between the following surfaces were done: - SBES MS and Xline SBES surfaces difference (Std Dev=0.07m) - SBES and MBES surfaces difference (Std Dev=0.07m). Points with the highest Standard Deviation were found at the edge of the swath and were not found an hindrance to general survey quality (see graphic illustration). The crossline quality control is conclusive for sheet H12724. Caris Base surface difference: SBES M/S vs. XL statisticsSupportFiles\H12724_SBES_MS_vs_XL_Base_4m.jpgCaris Base surface difference: SBES vs. MBES statisticsSupportFiles\H12724_SBES_vs_MBES.jpgMBES surface, graphic illustration of Std Dev points above 50 cmSupportFiles\H12724_MBES_50cm_Std_Dev_Outside_IHO.jpgSBES surface, graphic illustration of Std Dev points above 50 cmSupportFiles\H12724_SBES_4m_Std_Dev_Outside_IHO.jpgS30010.0N/A0.0Uncertainty values returned from MBES surface were excellent. 110 points out of 800150 total points are above 50cm of uncertainty (0.013%).IHOness for H12724SupportFiles\IHOness_Table_3.jpgTPU was calculated erroneously using zero errors for SV Measured and Surface. Also uncertainty source for Tide should be Realtime and not Vessel for TCARI. The nature of single beam sonar is such that sound speed uncertainty does not greatly influence overall uncertainty in the way it does with MBES. While the total propagated uncertainty will have been underreported for SBES and MBES soundings, all surveyed depths should be considered adequate to supersede charted soundings.No contemporary junction surveys available.The northern limits of H12724 junction with contemporary survey H12723. Data acquisition on H12723 was ongoing at the time of writing. Junction comparison will be documented in the Descriptive Report for H12723. Sonar 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.Daily CTD casts for mainscheme survey, every 4 hours maximum during MBES investigationsAll equipment and survey methods were used as detailed in the DAPR.MBES surface DensityMBES surface Density was controlled during data processing. The great majority of nodes showed a density of 5 or above. 14661 points out of 800150 total points showed a density under 5 (1.83%). This was not characterized as an hindrance to overall survey data quality. IHOness table, H12724SupportFiles\IHOness_Table_3.jpgMBES Density under 5.SupportFiles\H12724_MBES_50cm_Density_Outside_IHO.jpgSBES surface DensitySBES surface Density was controlled during data processing. The great majority of nodes showed a node density of 3 or above. 1236 points out of 313439 total points showed a density under 3 (0.39%). These points were analyzed and not characterized as an hindrance to overall survey data quality. IHOness table, H12724SupportFiles\IHOness_Table_3.jpgMBES surface Hypothesis Count MBES surface Hypothesis Count was controlled during data processing. The great majority of nodes showed an Hypothesis Count of 2 or below. 368 points out of 800150 total points showed an Hypothesis count above 2 (0.046%). These points were analyzed and not characterized as an hindrance to overall survey data quality. IHOness table, H12724SupportFiles\IHOness_Table_3.jpgMBES surface Hypothesis StrengthMBES surface Hypothesis Strength was controlled during data processing. The great majority of points showed an Hypothesis Strength under 0.01. 63 points out of 800150 total points showed an Hypothesis Strength over 0.01 (0.008%). These points were analyzed and not characterized as an hindrance to overall survey data quality. IHOness table, H12724SupportFiles\IHOness_Table_3.jpgSBES surface Standard DeviationSBES surface Standard Deviation was controlled during data processing. The great majority of points showed a Standard Deviation under 50cm. 34 points out of 313439 total points showed a Standard Deviation above 50 cm (0.01%). These points were analyzed and not characterized as an hindrance to overall survey data quality. IHOness table, H12724SupportFiles\IHOness_Table_3.jpgSBES surface UncertaintySBES surface Uncertainty was controlled during data processing. The great majority of points showed an Uncertainty under 50cm. 250 points out of 313439 total points showed an Uncertainty above 50 cm (0.08%). These points were analyzed and not characterized as an hindrance to overall survey data quality. IHOness table, H12724SupportFiles\IHOness_Table_3.jpgAll data reduction procedures conform to those detailed in the DAPR.A new patch test is conducted every time the MBES is installed on the side arm.MBES patch test, S30012014-06-17MB installed for contacts investigations.MBES patch test, S30012015-04-27MB installed for contacts investigations.Backscatter was not collected for this survey.NOAA Profile V_5_3H12724_MBES_50cmCUBE0.51.159.539NOAA_0.5mComplete MBESH12724_SBES_Base_4mBASE Uncertainty41.1312.13NOAA_4mMBES TracklineSBES Set Line SpacingH12724_100_1mSSS Mosaic100NOAA_1m100% SSSH12724_200_1mSSS Mosaic100NOAA_1m200% SSSH12724_Xline_Base_4mBASE Uncertainty41.6210.82NOAA_4mMBES TracklineSBES Set Line SpacingCaris surfaces were generated following the Field Procedure Manual and the Specifications and Deliverables guidance. One MB Cube surface was generated at a 50cm resolution, One SB Base surface was generated at a 4m resolution, One SB-Crossline Base surface was generated at a 4m resolution, and a 1m resolution Mosaic was created for each 100% and 200% coverage for the Side Scan Sonar data. No holidays were found.H12724_MBES_50cm Depth StatisticsSupportFiles\H12724_MBES_Depth_Stats.jpgH12724_SBES_Base_4m Depth StatisticsSupportFiles\H12724_SBES_Depth_Stats.jpgH12724_SBES_Xline_Base_4m Depth StatisticsSupportFiles\H12724_SBES_XL_Depth_Stats.jpgHolidays due to lack of complete SBES were found in limited areas during office review. A 4 m resolution combined surface "H12724_MBVB_4m_MLLW_Combined" was created during office review and was used to derive soundings for chart compilation. Navigation Unexamined Error Message in CarisNavigation was examined for all SBES and MBES lines, but Caris is still counting some lines as unexamined.Transducer Depths Above Water Error Message in CarisMessages were wrongfully generated by Caris when merging data. Please see Caris support ticket #01502012.Survey Area ExtensionSurvey area was extended slightly to cover a dynamic area North of the West end of Horn Island. Extension was approved by headquarters. Designated Soundings Change From HIPS&SIPS to BathyDatabasePositions of designated soundings changed slightly (e.g. 30-21-23.79N changes to 30-21-23.80N) when opening HIPS&SIPS surfaces in BathyDatabase.DAPR Offsets for 8125 Disagree With HVF TransducerThis issue was referenced in the Rapid Survey Assessment Form sent back to NRT1 after the first submittal of H12724. NRT1 can find no discrepancy between the submitted DAPR and the HVF offset values. Values all match for the Reson 8125, the Edgetech 4125, and the Odom SBES.Disagreements exist when comparing HVF bias and offset values against the bias and offset values documented in the DAPR. The discrepancies do not significantly affect data quality. No additional discussion. No HVCR was needed.Mean Lower Low WaterTCARIPascagoula, MS8741533J924NRT12014.tcFinal Approved2015-06-172015-07-01No changes made in Final Tides. J924NRT12014.tc file was approved by COOPS as Final and applied to dataset.North American Datum of 1983 (NAD83)UTM 16NSite ID 814 Chart comparison for soundings was accomplished by examining discrepancies between the largest scale chart and the bathymetric table created with current survey data. Sounding agreement was good and generally within one to three feet.113735280000522015-052015-06-182015-06-18Sounding agreement was good and generally within one to three feet.113722140000352015-092015-06-182015-06-18Sounding agreement was good and generally within one to three feet.The survey area contains discrepancies of greater than 1 to 3 feet, notably in the area of Dog Keys Pass and the West Point of Horn Island. The current survey shows that the 6-foot contour has migrated W, encompassing the charted 5-ft shallow, and superseding a charted 16 ft with 4 ft of depth. Two charted shoals (10 ft and 11 ft) on the outer edges of the safety fairway north of Horn Island have been adequately surveyed as 13 ft and 14 ft, respectively.US5MS11M40000452015-06-172015-06-17falseSounding agreement was good and generally within one to three feet.Chart comparison results for US5MS11M are the same as raster chart 11372.US4MS12M80000222015-06-192015-06-19falseSounding agreement was good and generally within one to three feet.No AWOIS items were assigned for this survey.No Maritime Boundary Points were assigned for this survey.Charted features within survey sheet were covered by 200% SSS. Significant items found in SSS record were investigated with a MBES when possible and safe. -1 Charted feature wreck "PA", located at 30d 13.4N and 88d 47.5W was investigated. No wreck was detected during the investigation. -1 Charted feature wreck "PA", located at 30d 16.1N and 88d 46.7W was investigated. No wreck was detected during the investigation. -1 Charted feature wreck "PA", located at 30d 14.2N and 88d 46.7W could not be safely investigated. No portion of hull or superstructure visible. -1 Charted feature wreck "PA", located at 30d 18.7N and 88d 46.2W could not be safely investigated. -1 Charted feature pile "PA", located at 30d 21.1N and 88d 46.8W was investigated. No pile was detected during the investigation. -1 Charted feature pile "PA", located at 30d 16.5N and 88d 46.2W was investigated. No pile was detected during the investigation. -1 Charted feature obstruction "PA", located at 30d 21.1N and 88d 46.2W was partially investigated, remainder of area was unsafe for navigation. No obstruction detected in covered area. -1 Charted feature obstruction "PA", located at 30d 17.1N and 88d 46.5W was investigated. No obstruction was detected during the investigation. Wreck PA located at 30d 13.4N and 88d 47.5WSupportFiles\H12724_SSS_8.jpgWreck PA located at 30d 16.1N and 88d 46.7WSupportFiles\H12724_SSS_6.jpgWreck PA located at 30d 14.2N and 88d 46.7WSupportFiles\H12724_SSS_7.jpgWreck PA located at 30d 18.7N and 88d 46.2WSupportFiles\H12724_SSS_3.jpgPile PA located at 21.1N and 88d 46.8WSupportFiles\H12724_SSS_2.jpgPile PA located at 30d 16.5N and 88d 46.2WSupportFiles\H12724_SSS_5.jpgObstruction PA located at 30d 21.1N and 88d 46.2WSupportFiles\H12724_SSS_1.jpgObstruction PA located at 30d 17.1N and 88d 46.5WSupportFiles\H12724_SSS_4.jpgWreck in Figure 21 (located at 30d 16.1N and 88d 46.7W) has already been removed from the charts. Pile in Figure 25 (located at 30d 16.5N and 88d 46.2W) has already been removed from the charts. Obstruction in Figure 27 (located at 30d 17.1N and 88d 46.5W) has already been removed from the charts. Significant contacts seen in 200% SSS record were investigated with a MBES when possible and safe. Three uncharted features were investigated. Please see details in Final Features File.0_1408_Obstruction_UnchartedSupportFiles\H12724_3D_000_1408.jpg0_1356_Obstruction_UnchartedSupportFiles\H12724_3D_235_1753.jpg072_1507_Wreck_UnchartedSupportFiles\H12724_3D_072_1507.jpgNo Danger to Navigation Reports were submitted for this survey.Three shoal areas were investigated at reduced line spacing with a MBES within the survey sheet: A 10 foot shoal generally located at 30d16.4N and 88d46.0W was investigated with a Multi Beam Sonar. Results of the investigation showed that the shoal is still present, and a least depth was recorded on the shoal. Update shoal with current depths and location. An 11 foot shoal generally located at 30d16.3N and 88d47.0W was investigated with a Multi Beam Sonar. Results of the investigation showed that the shoal is still present, and a least depth was recorded on the shoal. Update shoal with current depths and location. An 11 foot shoal generally located at 30d13.1N and 88d47.0W was investigated with a Multi Beam Sonar. Recommend deletion of charted Shl PA (6 ft rep 1994)Investigated 10 foot shoal located at 30d16.36N and 88d46.02WSupportFiles\H12724_3D_012_1714.jpg Investigated an 11 foot shoal generally located at 30d16.37N and 88d47.07WSupportFiles\H12724_3D_048_1621.jpg Investigated an 11 foot shoal generally located at 30d13.1N and 88d47.09WSupportFiles\H12724_3D_062_1539.jpgCharted shoal in Figure 33 (30d13.1N and 88d47.09W) has already been removed from the chart.Survey H12724 crossed the marked ICWW. The ICWW channel was found to be in general agreement or deeper than the USACE tabulated depths. Nine bottom samples were acquired on this sheet. A majority of samples taken did not agree with the charted bottom characteristics and need to be updated. Please see S-57 attribution in Caris Base for details.Shoreline was not assigned in the Hydrographic Survey Project Instructions or Statement of Work.No prior survey comparisons exist for this survey.Aids to navigation (ATONs) exist for this survey, and serve their purpose.No overhead features exist for this survey.An oil/gas pipeline crosses the sheet, it was not investigated.No ferry routes or terminals exist for this survey.No platforms exist for this survey.-The western end of Horn Island is in a very dynamic area (ocean currents) and has moved. Recommend updating chart with orthometric imagery.Horn Island movement zoneSupportFiles\Horn_Island_Movement.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.Reviewers of sheet H12724 will find deliverables in Caris Base format and the Final Feature File is a .000 file.Mark J. McMannTeam Lead NRT-12015-08-12