LOCALITY

New YorkState(s):

U.S. Department of CommerceNational Oceanic and Atmospheric Administration

National Ocean Survey

DESCRIPTIVE REPORT

Type of Survey:

2016NOAA National Geodetic Survey

Remote Sensing Division

New York Coastline

Fire Island Inlet to Moriches Inlet

General Locality:

Sub-locality:

Registry Number:

External Source Data

W00294

LIBRARY & ARCHIVES

Date:

W00

294

U.S. DEPARTMENT OF COMMERCENATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

REGISTRY NUMBER:

W00294HYDROGRAPHIC TITLE SHEET

INSTRUCTIONS: The Hydrographic Sheet should be accompanied by this form, filled in as completely as possible, when the sheet is forwarded to the Office.

State(s):

General Locality:

Sub-Locality:

Scale:

Dates of Survey:

Project Number:

Data Source:

Chief of Party:

Soundings by:

Imagery by:

Verification by:

Soundings Acquired in:

New York

New York Coastline

Fire Island Inlet to Moriches Inlet

10000

01/09/2014 to 02/25/2014

OSD-UNH-15

USGS (Alpine Ocean Seismic Survey, Inc.)

USGS (Alpine Ocean Seismic Survey, Inc.)

Multibeam Echo Sounder

N/A

Atlantic Hydrographic Branch Meters at Mean

Lower Low Water

Remarks:

The 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 https://www.ncei.noaa.gov/.

https://www.ncei.noaa.gov/

Descriptive Report Summary to Accompany W00294

Project OSD-UNH-15 Survey W00294 State New York Sub Locality Fire Island Inlet to Moriches Inlet Scale of Survey 1:10,000 Sonars Used R2Sonic 2024 MBES (dual head) Horizontal Datum North American Datum of 1983 (NAD83) Vertical Datum Mean Lower Low Water (MLLW) Vertical Datum Correction GPS PPK Tides Projection Latitude-Longitude (NAD83) - UTM Zone 18 Field Unit USGS (Alpine Ocean Seismic Survey, Inc.) Survey Dates 1/9/2014 to 2/25/2014 Chief of Party USGS (Alpine Ocean Seismic Survey, Inc.)

A. Area Surveyed

The data, as received from the USGS, have been post processed by the NOAA/UNH IOCM Group to best meet the requirements of the NOAA Office of Coast Survey Hydrographic Specifications and Deliverables and Field Procedures Manual.

Data was acquired within the following survey limits:

Northeast Limit Southwest Limit 40-45-36.288N 40-32-46.968N 072-45-09.054W 073-18-34.427W

Figure 1 Overview of W00294 1m bathymetric grid with background Charts 12326 and 12353.

W00294 overlaps with two post Hurricane Sandy surveys from project OPR-C331-KR-13. H12602 was completed prior to W00294 on Dec. 13th 2013, and H12603 was completed after W00294 on June 23rd 2014.

Figure 2 Regions of overlap between W00293, H12602 and H12603.

H12603

H12602

B. Survey Purpose

This survey was conducted by contractor Alpine Ocean Seismic Survey Inc. for multi agency post Hurricane Sandy Investigations by United States Geological Survey and Army Corps of Engineers. For the USGS the data collected was used as part of a larger study of coastal processes along Fire Island and assessment of coastal change during storms (Denny, J.F., Danforth, W.W., Couch, S., and Schwab, W.C., 2015). The Army Corps utilized the data for an ongoing coastal storm damage risk management study titled Evaluation of a Stabilization Plan for Coastal Storm Risk Management in Response to Hurricane Sandy.

C. Intended Use of Survey

Data is suitable for chart compilation and adequate to supersede prior data where deemed appropriate.

D. Data Acquisition and Processing

A traditional DAPR was not submitted with this data set. Similar details on vessel, systems and software used can be found in the accompanying document 1714.USGS.SOP. Additional data acquisition information can be found in the acquisition and processing log report 1714.MBEProcessing.NYB and the vessel survey report 1714.OffsetForm, also included in data submission. A summary of the equipment and software used for acquisition is listed in Table 1.

Multibeam 2 x R2Sonic 2024 MBES (dual head configuration) Surface Sound Speed Valeport Mini-SVS Watercolumn Sound Speed AML Plus –X SVP and/or YSI CastAway CTD Positioning and Motion Applanix PosMV 320 Data Acquisition Software QINSy PPK Positioning Post Processing POSPac Multibeam Data Processing Caris Hips and Sips

Table 1 Equipment and software used in data acquisition

The raw data in QINSy format and processed data in Caris format collected by Alpine was shared with the IOCM Center through the USGS. Additional processing was performed by the IOCM Group in Caris Hips and Sips 9.0.14 to assess the quality of the data and prepare the data for charting, including converting the data to MLLW from NAVD88, calculating uncertainty, and generating bathymetric and backscatter grids. The data was processed to meet Complete Coverage requirements as best possible with the exception of holidays. Table 2 lists the grids generated from the data and submitted for charting.

Surface Name Surface Type Resolution Range Format W00294_MB_1m_MLLW_East_Final Bathymetric 1m 4 – 20m CSAR W00294_MB_2m_MLLW_East_Final Bathymetric 2m 18 - 31m CSAR W00294_MB_1m_MLLW_West_Final Bathymetric 1m 4 – 20m CSAR W00294_MB_2m_MLLW_West_Final Bathymetric 2m 18 – 29 m CSAR W00294_Shearwater_300kHz Backscatter 2m -60 – 1 dB GeoTIFF

Table 2 Grids generated from bathymetric data.

http://www.nan.usace.army.mil/Portals/37/docs/civilworks/projects/ny/coast/fimp/FIMI_Docs/HSLRR/A-FINAL_FIMI_HSLRR_Report.pdfhttp://www.nan.usace.army.mil/Portals/37/docs/civilworks/projects/ny/coast/fimp/FIMI_Docs/HSLRR/A-FINAL_FIMI_HSLRR_Report.pdf

No Bottom samples were collected for this survey, however backscatter can be used to asses sediment distribution.

Figure 3 Overview of W00294 2m backscatter mosaic with background Charts 12326 and 12353

E. Data Quality

The data set was collected with 100m set line spacing. In depths greater than 35 feet complete coverage exists for the data, with the exception of some along track holidays and gaps over features. Close to shore, in depths less than 35 feet consistent along track holidays exist between lines, as seen in Figure 4. The majority of this survey has complete coverage. No crosslines were collected for this data set.

Figure 4 Area of 1m surface demonstrating along track holidays in coverage due to set line spacing in shallow near shore waters. Areas deeper than ~35 ft have complete coverage, with some exceptions.

In areas of multibeam coverage, excluding holidays and gaps in coverage, 94.5% or greater of nodes meet the data density requirements of 5 soundings per node for the 1m and 2m depth thresheld surfaces, as displayed in Figure 5.

Figure 5 Graphs representing the soundings per node for each finalized depth layer.

The Total Propagated Uncertainty was calculated based on the best available information from the reports and data. The majority of the survey meets IHO Order 1. 88.5% or greater of nodes in the 1m and 2m surfaces meet the total vertical uncertainty requirements, as displayed in Figure 5. The largest areas of uncertainty fall in the outerbeams. Figure 7 highlights regions of uncertainty in the data meeting IHO Order 1 and IHO Order 2. The areas of highest uncertainty exist in the outerbeams in shallow depths.

Figure 6 Graphs representing percent of surface nodes that meet IHO vertical uncertainty standards for each depth layer

Figure 7 Surface W00294_MB_1m_MLLW_West displaying areas of data that meet IHO Order 1 vertical uncertainly (green), and areas (Red) that meet IHO Order 2.

A calibration patch test was performed and values included in the Caris vessel file. The patch test lines were not submitted with the data, however a report documenting the patch test procedure, 1714.MBECalibration2, has been submitted with this survey. The sound speed casts were evaluated for frequency and location and found to be taken every 1 to 3 hours. Despite these measures to correct the data, environmental conditions have left motion artifacts and sound speed refraction artifacts in the data. These artifacts are the greatest in the outerbeams and are present in the surface at magnitudes of approximately +/- 0.2m. This error is within the total vertical uncertainty accepted for these depths. Despite this, the total calculated vertical uncertainty in the outerbeams for this survey exceeds IHO order 1 as seen in Figure 7.

Processing logs were submitted with the data, however acquisition logs were not, so there is no record of environmental conditions at the time of acquisition. Figure 8 shows motion artifacts present in the data dependent on line direction. The surface has been exaggerated vertically to visually enhance artifacts.

Figure 9 Lines from Julian Day 035 with fish representing line direction. Directional artifacts are most likely related to environmental conditions effecting ship movement.

Figure 10 Example of sound speed refraction artifact in the dataset.

There were several segments of lines with vertical offsets up to +/- 0.2m due to poor GPS Tide measurements. These segments were interpolated across in Caris Altitude Editor in accordance with the NOAA Specifications and Deliverables Manual and reprocessed to correct the error.

A dynamic draft table was not calculated for this survey. The R/V Shearwater is a 110 ft length, 39 ft beam, aluminum, twin hull research vessel. This is a stable hull shape and vertical offsets present in data due to lack of dynamic draft are most likely small and within IHO vertical uncertainty.

F. Chart Comparison

The following RNCs and ENCs cover the survey area:

RNC Scale Edition Edition Date LNM Date 12300 1:400,000 49 6/1/2012 4/11/2015 12326 1:80,000 52 6/1/2013 4/25/2015 12352 1:40,000 34 9/1/2012 7/4/2015 12353 1:80,000 19 11/1/2011 3/14/2015

ENC Scale Edition Update Date Issue Date US5NY52M 1:40,000 11.12 7/03/2014 4/28/2015 US4NY53M 1:80,000 10.2 5/20/2013 8/13/2015 US4NY1BM 1:80,000 4.3 8/13/2014 9/12/2014

A chart comparison and feature analysis was performed of the survey data. The data was found to agree within +/- 2 feet on average. A Composite Source File was not submitted with this survey, however a Final Feature File, W00294_FFF.000, was created during post processing. This layer includes 16 S-57 features digitized from the surface, including new features and charted features that have changed. Charted features that are unchanged have not been included in the feature file.

Two fish havens exist within the survey limits and have been included in the Final Feature File. It is recommended to update the least depth of the western one, position 40-35-53.650N 073-12-24.771W, and the eastern one, position 40-43-27.834N 072-46-27.904W. Debris falls outside the current boundaries of the eastern fish haven, as seen in Figure 11, and has been included in the Feature File.

Figure 11 Uncharted obstructions outside fish haven at position 40-43-27.834N, 072-46-27.904W as depicted in 1m surface. Coverage overlaps with comparison survey H12602 in this region.

G. Vertical and Horizontal Control

The vertical datum for this project is Mean Lower Low Water. Ellipsoid referenced GPS tides was the vertical control method used. PPK positioning was used and processed in POSPac. The data, as received from the USGS, referenced NAVD88. The IOCM Center generated a new MLLW Ellipsoid Reference Grid using VDatum, and reprocessed the GPS tides by substituting the NAVD88 reference grid in Caris. The maximum cumulative uncertainty for the reference grid was 0.097m one sigma.

The horizontal datum for this project is North American Datum of 1983 (NAD83). The navigation data was collected in WGS84 with a POSMV 320, and projected to NAD83 during post processing.

H. Additional Results

W00294 was compared with surveys H12602 and H12603 from project OPR-C331-KR-13. The data sets agree well. H12602 has a mean difference of 0.04m with a one sigma standard deviation of 0.11m. H12603 has a mean difference of 0.11m with a one sigma 0.09m standard deviation.

I. Approval

The survey has been post processed to meets requirements as set forth in the NOS Hydrographic Surveys and Specifications Deliverables Manual, Field Procedures Manual, and all HSD Technical Directives as best possible, based on limitations of data acquisition. 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 Survey Summary Report.

Approver Name Approver Title Approval Date Signature Andrew A. Armstrong, III Co-Director, NOAA-UNH

Joint Hydrographic Center 12/28/2015

References

Denny, J.F., Danforth, W.W., Couch, S., and Schwab, W.C., 2015, Swath bathymetry collected offshore of Fire Island and western Long Island, New York in 2014, U.S. Geological Survey Field Activity 2014-072-FA: U.S. Geological Survey data release. http://doi:10.5066/F7C827BX

http://doi:10.5066/F7C827BX

APPENDIX I

TIDES AND WATER LEVELS

Survey W00294 does not include supplemental tide or water level information.

APPENDIX II

SUPPLEMENTAL SURVEY RECORDS AND CORRESPONDENCE

Survey W00294 does not include supplemental survey records or correspondence.

APPROVAL PAGE

W00294

Data meet or exceed current specifications as certified by the OCS survey acceptance review process. Descriptive Report and survey data except where noted are adequate to supersede prior surveys and nautical charts in the common area.

The following products will be sent to NCEI for archive - W00294_DR.pdf- Collection of depth varied resolution BAGS- Processed survey data and records- W00294_GeoImage.pdf

The survey evaluation and verification has been conducted according current OCS Specifications, and the survey has been approved for dissemination and usage of updating NOAA’s suite of nautical charts.

Approved:_____________________________________________________________________ Lieutenant Commander Briana Hillstrom, NOAA Chief, Atlantic Hydrographic Branch

W00294_DR_Cover&Title_PagesDR_REDnote-Header_template_JUN-2016W00294_DRW00294_DR_AppendicesW00294_DR Branch Approval Page

2017-12-20T16:01:44-0500HILLSTROM.BRIANA.WELTON.1267667531