S-N918-NRT3-18Columbia River AnchoragesColumbia River, WA and ORNOAA Navigation Response Team 3F007437Woodland and Henrici Bar AnchoragesOregonWashingtonUnited States100002018Michelle M. Levano, LTJG/NOAANavigable Area2018-07-272018-08-072018-08-14Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersUTCPacific 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 Environmental Information (NCEI) and can be retrieved via http://www.ncei.noaa.gov/.NOAAThis hydrographic survey was acquired in accordance with the requirements defined in the Project Instructions S-N918-NRT3-18 (Figure 1 and 2). This survey was conducted at the request to update the nautical charts for the anchorages on the Columbia River from the Columbia River Pilots (COLRIP) and the Columbia River Steamship Operators' Association, Inc. (CRSOA).45.8997328333122.80505583345.760015122.762191833Overview of anchorage areas surveyed (Charts 18524, 18525).\Support Files\F00743 Overview.PNGF00743 assigned survey area (Charts 18524_2, 18525).\Support Files\F00743 Limits.PNGData were acquired to the survey limits in accordance with the requirements in the Project Instructions and the 2018 NOS Hydrographic Surveys Specifications and Deliverables (HSSD)The Columbia River Steamship Operators' Association, Inc. (CRSOA) and the Columbia River Pilots (COLRIP) requested that NOAA's Office of Coast Survey collect multibeam bathymetric data of the Columbia River anchorages. The Woodland anchorage to the north is adjacent to the cities of Columbia City and St Helens, Oregon. Local businesses include a pulp and paper mill and a large chemical factory with a pier on the north end of Columbia City. The Henrici anchorage upriver, is positioned directly next to two public beaches and the Ridgefield National Wildlife Refuge. The entire survey is adequate to supersede previous data.Data acquired in F00722 meet multibeam echo sounder (MBES) coverage requirements for object detection, as required by the HSSD. This includes crosslines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). The surface was analyzed using HydrOffice QC Tools Grid QA feature. Density requirements for F00743 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3 (Figure 3). The few nodes that did not meet density requirements are due to sparse data in the outer beams, especially near steep sand waves, slopes and rocky areas where acoustic shadowing occurred, and at the edges of the survey limits.Pydro derived histogram plot showing HSSD object detection compliance of F00743 MBES within the finalized CUBE surface. \Support Files\F00743_MB_VR_CDR.QAv5.density.pngAll waters in survey areaObject Detection Coverage (Refer to HSSD Section 5.2.2.2)Object detection multibeam coverage was achieved within the limits of hydrography as defined in the project instructions with some exceptions (Figure 4). In all areas where the 3.5 meter depth contour or the sheet limits were not met, the Navigable Area Limit Line (NALL) was defined as the inshore limit of bathymetry due to the proximity of a populated beach and safety concerns. F00743 data was reviewed in CARIS HIPS and SIPs for holidays in accordance with Section 5.2.2.3 of the HSSD. 80 holidays were identified via HydrOffice QC Tools Holiday Finder tool. Upon hydrographer inspection, 77 of the identified holidays are within the survey limits and not along the edge of the survey. This tool automatically scans the surface for holidays as defined in the HSSD and was run in conjunction with a visual inspection of the surface by the hydrographer. The high number of holidays is discussed in section B.5.2 of this report. Example of F00743 NALL determination\Support Files\F00743 NALL.PNGSurvey coverage of F00743 compared to S-N918-NRT3-18 project overview.\Support Files\F00743 with River.PNGS3006058.49000004.610280100.0570000000058.55000004.6107.8730000.632018-08-072018-08-082018-08-092018-08-112018-08-14Refer to the Data Acquisition and Processing Report (DAPR) titled S-N918-NRT3-18_rev1 and S-N918_NRT3-18_RAINIER_Launches 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.S30063442801283.6NRT3 S3006\Support Files\NRT3 S3006.png2801 RA-4\Support Files\2801_RA4.jpgIn conjunction with Navigation Response Team 3, NOAA Ship RAINIER provided launch RA-4 to assist with data collection on S-N918-NRT3-18. All data for survey F00743 was acquired by NRT-3 and RA-4. The vessels acquired multibeam depth soundings, sound speed profiles, and bottom samples.Kongsberg MaritimeEM 2040CMBESApplanixPOS MV 320 v5Positioning and Attitude SystemAML OceanographicMicroX SVSound Speed SystemYSICastAway-CTDSound Speed SystemKongsberg MaritimeEM 2040MBESTeledyne RESONSVP 70Sound Speed SystemSea-Bird ScientificSBE 19plusConductivity, Temperature, and Depth SensorApplanixPOS MV 320 v4Positioning and Attitude SystemEquipment listed above was used on S3006 and RA-4. Multibeam crosslines were collected by S3006 across a variety of depth ranges, water masses, and survey dates with good spacial distribution (Figure 8). Crosslines were collected, processed and compared in accordance with Section 5.2.4.2 of the HSSD. A Variable Resolution (VR) surface was created using only mainscheme lines, and a second VR surface was created of only crosslines. A difference surface was generated in Pydro Explorer's Compare Grids tool by subtracting the crossline only surface from the mainscheme surface (mainscheme- crosslines= difference surface), (Figure 9). From the difference surface, the following statistics were derived. The mainshceme only, crossline only, and difference surface are included in the submission of this survey as Digital Data. In total, 99.5% of the total number of nodes pass the TVUmax test between F00743 mainscheme and crossline data (Figure 10). For F00743 respective depths, the difference surface was compared to IHO allowable Total Vertical Uncertainty (TVU) standards (Figure 11 and 12). The analysis was performed on F00743 MBES data reduced to Columbia River Datum (CRD) using Ellipsoidally Referenced Survey (ERS) methods.F00743 crossline surface overlaid on mainscheme tracklines showing good temporal and geographic distribution.\Support Files\F00743 XL Distribution.PNGF00743 crossline TVU allowance surface overlaid on mainscheme MBES data. Positive values represent areas were mainscheme data is deeper than crossline data. Negative values represent areas where crossline data is deeper than mainscheme data.\Support Files\F00743 TVU.PNGHistogram plot utilizing the magnitude (absolute value) of the Allowable Error Fraction to show the indication of what percentage of the total number of comparisons pass the TVUmax test.\Support Files\F00743_MS_Diff_XL_fracAllowErr_Freq.pngThe statistic and distribution summary plot of the difference between F00743 mainscheme and crossline data. \Support Files\F00743_MS_Diff_XL_depth_delta.pngNode Depth vs Allowable Error Fraction graphic with values between and including +/- 1 representing passing comparisons.\Support Files\F00743_MS_Diff_XL_fracAllowErr_vsDepth.pngERS via VDATUM0.00.12S30061.0N/A0.1528013.0N/A0.5Total Propagated Uncertainty (TPU) values for F00743 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 unit. A visual inspection of the Uncertainty layer revealed the areas of higher uncertainty occurred in the outer beams, over sand waves, and shifting bottom types. In addition to the usual a priori estimates of uncertainty provided via device models for vessel motion, ERS, real time and post processed uncertainty sources were also incorporated into the depth estimates of F00743. Real-time uncertainties from the Kongsberg 2040C MBES sonars were incorporated and applied during post processing. Uncertainties associated with vessel roll, gyro, and navigation were applied real-time. F00743 utilized kinematic (RTK) positioning service. The recorded delayed heave Applanix files included an estimate of the heave uncertainty and were applied during post processing. All of the aforementioned uncertainties were applied in CARIS. F00743 is an ellipsoidally referenced survey (ERS) and the tidal component was accomplished via separation model. The surface was analyzed using the HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Overall, 93% of nodes within the surface meet NOAA Allowable Uncertainty specifications for F00743 (Figure 13). Pydro derived histogram plot showing HSSD uncertainty standards compliance of F00743 finalized VR surface\Support Files\F00743_MB_VR_CDR.QAv5.tvu_qc.pngSonar 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.At least once every 4 hours.Sound Velocity Profiles (SVP) casts were taken at least once every four hours with sufficient frequency, density, depth and accuracy as outlined in section 5.2.3.3 of the 2018 HSSD (Figure 14). The SVP casts were applied to the MBES lines in CARIS using the "nearest in distance within time of 4 hours" method.F00743 Sound speed cast locations. \Support Files\F00743 Sound Speed Casts.PNGAll 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.Raw backscatter data is logged as .all file for delivery to NOAA's Pacific Hydrographic Branch. NOAA's Navigation Response Branch field units are waived from producing backscatter mosaics for the 2018 field season. All equipment and survey methods were used as detailed in the DAPR. CarisHIPS/SIPS10.4.1NOAA Profile V_5_8F00743_MB_VR_CDRCARIS VR Surface (CUBE)Variable Resolution1.518.0NOAA_VRObject DetectionF00743_MB_VR_CDR_FinalCARIS VR Surface (CUBE)Variable Resolution1.518.0NOAA_VRObject DetectionThe survey was carried out to meet the Object Detection MBES Coverage requirements as defined by Section 5.2.2 of the 2018 Hydrographic Survey Specifications and Deliverables. Due to hydrographer oversight, the two anchorages in F00743 were analyzed in the field under complete coverage standards rather than object detection. Of the 80 object detection holidays determined by Pydro Explorer QC Tools 2, nearly all are coverage caps that occur between survey lines due to ship handling and acquisitions settings and occur at the 0.5 meter surfaces. 56 of these holidays are in less than 5 meters of water (Figure 15 ). For the remaining holidays in over 5 meters of water, the majority of them are coverage gaps that occur between survey lines due to driving and acquisition settings or are relative to sand wave location (Figure 16). None of these holidays are near any charted or surveyed Dangers to Navigation (DToNs), and the hydrographer recommends that this survey be processed and compiled to object detection standards. Holidays present in less than 5 meter depths. \Support Files\F00743 Holidays.PNGHoliday in over five meter depths near sand waves. \Support Files\F00743 Holidays 2.PNGField installed tide and GPS stations were not utilized for this survey. There is no HVCR report included with the submission of F00743.Mean Lower Low WaterERS via VDATUMNAD83-mllwCRD_Geoid09.csarSounding elevations relative to the ellipsoid were collected through Ellipsoidal Referenced Survey (ERS) with post-processing of the daily logged POSPac data to create a statistical best estimate of trajectory (SBET) file, as detailed in the DAPR, All of F00743 meets HSSD vertical accuracy requirements.North American Datum 1983Projected UTM 10Precise Positioning-Real Time Extended (PP-RTX) processing methods were used in Applanix POSpac MMS 8.3 software to produce SBETs for post-processing horizontal correction. All of F00743 meets HSSD horizontal accuracy requirements.The chart comparison was made using a CARIS sounding and contour layer derived from the finalized VR surface. The contours and sounders were overlaid on the chart and compared for general agreement and to identify areas of significant change.US5OR13M40000582018-12-172018-11-08US5OR14M40000522018-12-172018-11-08Two Dangers to Navigation (DtoN) were identified in the F00743 survey area and submitted to Marine Chart Division's (MCD) Nautical Data Branch. Refer to the F00743_DTON_Report submitted in the Appendix of this survey for location and description of the dangers. No charted features exist for this survey.No uncharted features exist for this survey.The western and eastern portions of the Woodland and Henrici anchorages respectively, include the maintained channel of the river. Soundings from F00743 data found the channel depths to the greater or equal to the stated depths on the chart (Figure 19). 42 ft depth section of maintained channel (in blue) with F00743 soundings (in black). \Support Files\Channel depths.PNGOne aid to navigation was assigned and investigated. One buoy with light was observed serving its intended purpose and on station, but the light characteristic was not seen due to daylight. Due to hydrographer oversight, an image was not retained of the AtoN and associated light. No Maritime Boundary Points were assigned for this survey.Three bottom samples were conducted in the assigned location. Each attempt was successful. There are no drop camera images submitted with these bottom samples. Refer to the results included in the F00743 Final Feature File submitted with this report.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.Large sand waves occur in a significant portion of the survey area. Most waves are within 1-2 1/2 meters high and run perpendicular to the water flow of the river (Figure 20). Sand waves present in F00743 survey area. \Support Files\F00743 sand waves.PNGNo 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 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.Michelle M. Levano, LTJG/NOAAChief of Party2019-05-03PST Timothy Wilkinson Hydrographer2019-05-03Data Acquisition and Processing Report2019-03-14Coast Pilot Report2018-12-17