Side Scan Sonar Results for Additional Hardbottom Habitat Identification in Charleston Entrance Channel
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1 U.S. Army Corps of Engineers Charleston District APPENDIX H CHARLESTON HARBOR POST 45 BENEFICIAL USE OF DREDGED MATERIAL SUPPLEMENTAL ENVIRIONMENTAL ASSESSMENT CHARLESTON, SOUTH CAROLINA Side Scan Sonar Results for Additional Hardbottom Habitat Identification in Charleston Entrance Channel 30 September 2016
2 Geophysical Survey of Area C; Charleston Harbor Entrance Channel Provided for: USACE Wilmington District Attn: Trevor Lancaster 69 Darlington Ave Wilmington, NC Provided by: 310 A Greenfield Dr. Newport, NC As part of a requested preliminary data product per SOW Section 9.5, provided on: June 9, 2016
3 CHARLESTON HARBOR ENTRANCE CHANNEL HYDROGRAPHIC SURVEY - COLLECTED MAY 24, 2016 Data Summary Project Information Project Charleston Harbor Entrance Channel Geophysical Survey Contract W912PM-16-D-0002 Survey Location Section EC13 EC14; Area C Survey Dates May 24, 2016 Surveyors Captain Ben Sumners, Kristin Hughes Kurt Baker Equipment Survey Vessel Sonar Frequency/Range Positioning Layback Calculation Acquisition Software Processing Software RV Benthos: 30 ft Armstrong Catamaran, Twin Yamaha 300 Motors Edgetech /600 khz, EM2040c-D 600 khz / 50 m Range (100 m swath) Trimble SPS DGPS Manual Corrected Layback HYPACK Driver Discover (JSF format), SIS SonarWiz 6 v , ESRI ArcGIS 10.3, FMGeocoder Toolbox Products Delivered Delivery Format ESRI ArcGIS 10.3 Spatial Reference Ecology_reef_habitat_area SeabedArea C_sss.tif C_bkstr Layer Files Images NAD South Carolina Int. Ft. SDSFIE polyline feature class indicating areas of potential hard bottom SDSFIE feature class polygonal area of the bottom of water body, in this instance indicating areas of high/medium/low reflectance 8-bit 1-band GeoTIFF of side scan sonar intensity translated in pixels, 0.2 ft resolution Raster grid of normalized backscatter from EM2040c-D Layer files displaying optimized views for respective datasets Basic maps for viewing and presentation GEODYNAMICS PRELIMINARY DATASET PAGE 2
4 CHARLESTON HARBOR ENTRANCE CHANNEL HYDROGRAPHIC SURVEY - COLLECTED MAY 24, 2016 Synopsis Abstract This hydrographic survey was conducted roughly 12 nautical miles (NM) from the inlet to Charleston Harbor at a ~0.43 NM area between channel sections EC-13 and EC-14, referred to as Area C. Within this Task Order, Area C was the only site to have side scan sonar (SSS) data collected. SSS data was collected at 125 ft spaced lines at a 160 ft range using the 600 khz frequency from an Edgetech 4200 sonar. Per SOW, this dataset was dictated to be processed and delivered as soon as possible. To provide the most thorough interpretations within a timely manner, multibeam bathymetry, backscatter reflectivity, and sub-bottom profiles were processed to a preliminary phase to provide reference material to delineate areas of potential hardbottom. As processing continues and correlations progress, these delineations may be subject to change. Digitization The areas initially digitized as potential hardbottoms, or reef_habitat_area per SDSFIE Feature Class (v2.6), represent features interpreted as outcrops, rock ledges, or exposed substrate. While these areas represent specific sites of potential hardbottoms, other portions of the surficial geology may present semi-indurated areas of seafloor, as noted by trawl/dredge scar features imprinted upon bedform features, mostly in the NW third of the survey area. This leaves question to the mobility vs. induration of the observed bedform features, and whether these areas that appear to be indurated or semi-indurated should be classified as potential hardbottom. To address the generally high reflectivity of these areas, an interpretation of the reflectivity for the area was generated from SSS imagery, with assistance from backscatter reflectivity. SeabedArea SDSFIE Feature Class was generated to denote areas of high, medium and low reflectivity. While areas of low reflectivity (lower db/darker) are expected to have a (potentially thin) sediment veneer, areas of high reflectivity (higher db/brighter) should be considered as potentially indurated to semi-indurated substrate. A Further research and investigation of the current hydrographic datasets and CORPS provided information should improve the understanding of observed features and may cause reason to adjust these initial assessments. In the event that changes are made, USACE will be contacted as soon as possible. It should also be noted additional ground truth GEODYNAMICS PRELIMINARY DATASET PAGE 3
5 CHARLESTON HARBOR ENTRANCE CHANNEL HYDROGRAPHIC SURVEY - COLLECTED MAY 24, 2016 data at specific areas based upon these datasets would be critical for a full seabed interpretation. GEODYNAMICS PRELIMINARY DATASET PAGE 4
6 Figure 1. Mosaic of SSS with contacts/targets and areas of potential hardbottom digitized.
7 CHARLESTON HARBOR ENTRANCE CHANNEL HYDROGRAPHIC SURVEY - COLLECTED MAY 24, 2016 Figure 2. Mosaic of backscatter intensity showing reflectance (white is higher reflectance, i.e., more coarse than darker areas). GEODYNAMICS PRELIMINARY DATASET PAGE 2
8 Report Area C-SSS Target Report Generated on 6/9/ :09:34 Report file: Area C-SSS Target Report.docx Contacts in the report: Feature0001 5/24/ :26: Feature0002 5/24/ :27: Feature0003 5/24/ :10: Feature0005 5/24/ :10: Feature0006 5/24/ :08: Feature0007 5/24/ :06: Feature0008 5/24/ :05: Feature0009 5/24/ :43: Feature0010 5/24/ :44: Feature0011 5/24/ :44: Feature0013 5/24/ :23: Feature0014 5/24/ :10: Feature0016 5/24/ :58: Feature0017 5/24/ :09:
9 Feature0018 5/24/ :10: Feature0019 5/24/ :08: Feature0020 5/24/ :06: Feature0021 5/24/ :05: Feature0022 5/24/ :58: Feature0023 5/24/ :46: Feature0024 5/24/ :47: Feature0025 5/24/ :17: Feature0026 5/24/ :13: Feature0027 5/24/ :41: Feature0028 5/24/ :42: Feature0029 5/24/ :34: Feature0030 5/24/ :30: Feature0031 5/24/ :22: Feature0032 5/24/ :55: Feature0034 5/24/ :44: Feature0035 5/24/ :44:
10 Feature0001 Sonar Time at Target: 5/24/ :26: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Width: Int. ft Target Height: 0.26 Int. ft Target Length: Int. ft Target Shadow: 1.76 Int. ft Description: dredge scars
11 Feature0002 Sonar Time at Target: 5/24/ :27: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Width: Int. ft Target Height: 0.00 Int. ft Target Length: Int. ft Target Shadow: 0.00 Int. ft Description: depression with pockmarks inside and dredge scars surrounding
12 Feature0003 Sonar Time at Target: 5/24/ :10: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Width: 9.89 Int. ft Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: dredge scars
13 Feature0005 Sonar Time at Target: 5/24/ :10: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.29 Int. ft Target Length: Int. ft Target Shadow: 1.41 Int. ft Description: likely low relief hard outcrops
14 Feature0006 Sonar Time at Target: 5/24/ :08: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.37 Int. ft Target Length: Int. ft Target Shadow: 1.75 Int. ft Description: potential rock outcrops
15 Feature0007 Sonar Time at Target: 5/24/ :06: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.51 Int. ft Target Length: Int. ft Target Shadow: 2.84 Int. ft Description: potential rock outcrops and pockmarks
16 Feature0008 Sonar Time at Target: 5/24/ :05: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.61 Int. ft Target Length: Int. ft Target Shadow: 3.18 Int. ft Description: ledge - potential outcrop
17 Feature0009 Sonar Time at Target: 5/24/ :43: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.42 Int. ft Target Length: 0.00 Int. ft Target Shadow: 1.43 Int. ft Description: potential outcrop area
18 Feature0010 Sonar Time at Target: 5/24/ :44: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.42 Int. ft Target Length: 0.00 Int. ft Target Shadow: 1.81 Int. ft Description: potential outcropping area
19 Feature0011 Sonar Time at Target: 5/24/ :44: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: potential outcrops
20 Feature0013 Sonar Time at Target: 5/24/ :23: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: pockmarks
21 Feature0014 Sonar Time at Target: 5/24/ :10: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Width: Int. ft Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: trawl/dredge scars
22 Feature0016 Sonar Time at Target: 5/24/ :58: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: bedform features of unkown induration
23 Feature0017 Sonar Time at Target: 5/24/ :09: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Width: 3.13 Int. ft Target Height: 0.56 Int. ft Target Length: Int. ft Target Shadow: 1.39 Int. ft Description: depression, potential outcrop
24 Feature0018 Sonar Time at Target: 5/24/ :10: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: depression and feature and trawl/dredge scars
25 Feature0019 Sonar Time at Target: 5/24/ :08: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.61 Int. ft Target Length: Int. ft Target Shadow: 2.45 Int. ft Description: ledge feature
26 Feature0020 Sonar Time at Target: 5/24/ :06: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: group of depressions
27 Feature0021 Sonar Time at Target: 5/24/ :05: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.67 Int. ft Target Length: Int. ft Target Shadow: 3.18 Int. ft Description: ledge feature
28 Feature0022 Sonar Time at Target: 5/24/ :58: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.73 Int. ft Target Length: Int. ft Target Shadow: 4.61 Int. ft Description: hole feature and trawl/dredge scars over bedform features
29 Feature0023 Sonar Time at Target: 5/24/ :46: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.16 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.66 Int. ft Description: small ledge feature
30 Feature0024 Sonar Time at Target: 5/24/ :47: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: group of depressions/holes
31 Feature0025 Sonar Time at Target: 5/24/ :17: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Width: 4.73 Int. ft Target Height: 0.62 Int. ft Target Length: 5.04 Int. ft Target Shadow: 3.03 Int. ft Description: group of depressions/holes
32 Feature0026 Sonar Time at Target: 5/24/ :13: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.85 Int. ft Target Length: Int. ft Target Shadow: 5.42 Int. ft Description: ledge feature
33 Feature0027 Sonar Time at Target: 5/24/ :41: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: SS-PU Target Height: 0.71 Int. ft Target Length: Int. ft Target Shadow: 2.56 Int. ft Description: ledge feature
34 Feature0028 Sonar Time at Target: 5/24/ :42: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: SS-PU Target Height: 0.73 Int. ft Target Length: Int. ft Target Shadow: 2.59 Int. ft Description: scalloped ledge feature
35 Feature0029 Sonar Time at Target: 5/24/ :34: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: SS-PU Target Height: 0.00 Int. ft Target Length: 0.00 Int. ft Target Shadow: 0.00 Int. ft Description: shadow, appears to be a hole/depression
36 Feature0030 Sonar Time at Target: 5/24/ :30: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: SS-PU Target Height: 0.47 Int. ft Target Length: Int. ft Target Shadow: 2.44 Int. ft Description: ledge feature
37 Feature0031 Sonar Time at Target: 5/24/ :22: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.77 Int. ft Target Length: Int. ft Target Shadow: 1.82 Int. ft Description: small ledge feature
38 Feature0032 Sonar Time at Target: 5/24/ :55: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.10 Int. ft Target Length: Int. ft Target Shadow: 0.36 Int. ft Description: hole and shallow ledge
39 Feature0034 Sonar Time at Target: 5/24/ :44: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.50 Int. ft Target Length: 0.00 Int. ft Target Shadow: 2.14 Int. ft Description: outcrop-ledge feature
40 Feature0035 Sonar Time at Target: 5/24/ :44: (WGS84) (X) (Y) (Projected Coordinates) Range to target: Int. ft Fish Height: Int. ft Heading: Degrees Line Name: Target Height: 0.18 Int. ft Target Length: Int. ft Target Shadow: 1.07 Int. ft Description: outcrop-ledge feature
41
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