Long Island Sound 2010

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Long Island Sound 2010 Current Survey

Tidal Directions, Tidal Data Plots, Current Graphs, R Value Graphs, and

Tidal Current Graphs observed and compared to NYHOPS simulations.

PowerPoint prepared by David J. D’Agostino,

under the direction of Dr. Nickitas Georgas.

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Notes

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• Data points shown as blue dots on the following U-V plots represent all of the data sampled (from all vertical bins with valid data) while the directional

arrows represent calculated directions based off of compared bins only (bins with common water column depths between model and observations).

• Observed Directional Arrow is in Yellow while the Modeled Directional Arrow is in Pink, both representing the Direction of the depth-averaged (D-A)

current.

• Tidal orientation along the principal current direction is Flood.

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Long Island Sound - All

Legend

= Model Station

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4 Legend

= Model Station

= Observed Station

Long Island Sound – East to West 1

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Legend

= Model Station

= Observed Station

Long Island Sound – East to West 2

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6 Legend

= Model Station

= Observed Station

Long Island Sound – East to West 3

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Green Stations = Percent Error<10%.

Orange Stations = 10%<Percent Error<20%.

Red Stations = Percent Error>20%.

Note: Percent Error based on M

₂

Current Amplitude Along PCD

Legend

Long Island Sound –All with Accuracies on Grid

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Analysis at Stations

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The Eastern most point of data collection in the Long Island Sound survey, the “Throgs Neck Bridge” station is just off the Eastern side of the bridge, and lies off the

Southeastern tip of the mainland.

• Station ID : LIS1038

• Station Name : Throgs Neck Bridge

• Project Type : Tidal Current Survey

• Requested Data Start : 2010/07/18 12:20

• Requested Data End : 2010/09/01 12:20

• Deployment Depth (m) : 18.9

• Deployment Latitude (deg) : 40.80105

• Deployment Longitude (deg) : -73.79210

• GMT Offset (hrs) : 5

• Sensor Type : Workhorse ADCP

• Sensor Orientation : up

• Number of Beams : 4

• Number of Bins : 25/16/16*

• Bin Size (m) : 1.0

• Blanking Distance (m) : 0.88

• Center to Bin 1 Distance (m) : 2.1

• Platform Height From Bottom (m) : 0.6

• MSL Depth (m): 27.95

• Station Nick Name: TNB-10 Note:

-Yellow arrow indicates Observed -Pink arrow indicates Modeled

Percent Error in reference to the Current Along PCD for M

₂

= 15.5%

Observed Magnitude for M

₂

= 0.49m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.08m/s

*Count reported/Valid under water/Compared given the model’s depth

Throgs Neck Bridge

Legend

= Model Station

= Observed Station

= Station of Interest

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Note: Solid Line = Observed Results Dashed Line = NYHOPS Simulated Results

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Right off the southern tip of Hart Island, The “Hart Island” station lies in a narrow pass between the mainland and Hart Island.

• Station Name : Hart Island

• Station Nick Name: HI-10

12 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 7.3%

Observed Magnitude for M

₂

= 0.27m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.02m/s

*Count reported/Valid under water/Compared given the model’s depth

Hart Island

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Right off of Sands Point, “Execution Rocks” is one of the Eastern most stations in the Long Island Sound.

• Station Name : Execution Rocks

• Station Nick Name: ER-10 Note:

Legend

= Model Station

= Observed Station

= Stations of Interest

Percent Error in reference to the Current Along PCD for M

₂

= 16.2%

Observed Magnitude for M

₂

= 0.22m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.04m/s

*Count reported/Valid under water/Compared given the model’s depth

Execution Rocks

Legend

= Model Station

= Observed Station

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The “Matinecock Pt, 1.7 NW of” station lies directly in the middle of the Long Island Sound approaching the Execution Rocks station.

• Station Name : Matinecock Pt, 1.7 m NW of

• Number of Bins : 25/1-13,17-19/13*

• Station Nick Name: MP-10

18 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 1.4%

Observed Magnitude for M

₂

= 0.21m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.00m/s

*Count reported/Valid under water/Compared given the model’s depth

Matinecock Pt., 1.7 m NW of

Legend

= Model Station

= Observed Station

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To the Eastern end of the Long Island sound lies “The Cows, 2 miles SE”

station, which lies in the middle section of the Sound.

• Station Name : The Cows, 2 miles SE

• Number of Bins : 20 /1-13,15/12*

• Station Nick Name: TC-10

Legend

= Model Station

= Observed Station

= Stations of Interest Note:

Percent Error in reference to the Current Along PCD for M

₂

= 8.8%

Observed Magnitude for M

₂

= 0.28m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.02m/s

*Count reported/Valid under water/Compared given the model’s depth

The Cows, 2 miles SE

Legend

= Model Station

= Observed Station

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The “Stratford Point” station lies directly to the South of Stratford Point, as the name suggests. This station is In the middle of the Sound, and off to its Eastern side.

• Station Name : Stratford Point

• Station Nick Name: Spoint-10

24 Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 19.6%

Observed Magnitude for M

₂

= 0.39m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.08m/s

*Count reported/Valid under water/Compared given the model’s depth

Stratford Point

Legend

= Model Station

= Observed Station

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Directly North of the Port Jefferson entrance lies the “South Stratford Shoal” station South of the middle section of the Long Island Sound.

• Station Name : South Stratford Shoal

• Station Nick Name: SSS-10

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 8.0%

Observed Magnitude for M

₂

= 0.39m/s

Difference Between Observed & Modeled Magnitudes for M

₂

=0.03m/s

*Count reported/Valid under water/Compared given the model’s depth

South Stratford Shoal

Legend

= Model Station

= Observed Station

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On the Eastern side of the New Haven Harbor mouth lies the “New Haven Harbor Entrance” station.

• Station Name : New Haven Harbor Entrance

• Station Nick Name: NHHE-10

30 Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 24.5%

Observed Magnitude for M

₂

= 0.25m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.06m/s

*Count reported/Valid under water/Compared given the model’s depth

New Haven Harbor Entrance

Legend

= Model Station

= Observed Station

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Almost directly in the Center of the Long Island Sound lies the “Branford Reef” station.

• Station Name : Branford Reef

• Station Nick Name: BR-10 Note:

Percent Error in reference to the Current Along PCD for M

₂

= 39.2%

Observed Magnitude for M

₂

= 0.32m/s

Difference Between Observed & Modeled Magnitudes for M

₂

=0.15m/s

*Count reported/Valid under water/Compared given the model’s depth

Branford Reef

Legend

= Model Station

= Observed Station

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The “Roanoke Pt. Shoal” station lies just North of the Long Island mainland.

• Station Name : Roanoke Pt. Shoal

• Station Nick Name: RPT-10

36 Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 26.6%

Observed Magnitude for M

₂

= 0.33m/s

Difference Between Observed & Modeled Magnitudes for M

₂

=0.09m/s

*Count reported/Valid under water/Compared given the model’s depth

Roanoke Pt. Shoal

Legend

= Model Station

= Observed Station

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In the Central Eastern section of the Long Island Sound lies the

“Hammonassett” surveying station.

• Station Name : Hammonassett

• Station Nick Name: H-10

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 0.3%

Observed Magnitude for M

₂

= 0.75m/s

Difference Between Observed & Modeled Magnitudes for M

₂

=0.00m/s

*Count reported/Valid under water/Compared given the model’s depth

Hammonassett

Legend

= Model Station

= Observed Station

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The “Six Mile Reef” Station lies in the East central section of the Long Island Sound, almost precisely in middle .

• Station Name : Six Mile Reef

• Station Nick Name: SMR-10

42 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 63.3%

Observed Magnitude for M

₂

= 0.62m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.39m/s

*Count reported/Valid under water/Compared given the model’s depth

Six Mile Reef

Legend

= Model Station

= Observed Station

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The “CF Buoy” station lies more towards the Eastern mouth entrance of the Long Island Sound.

• Station Name : CF Buoy

• Station Nick Name: CFB-10 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 19.9%

Observed Magnitude for M

₂

= 0.82m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.16m/s

*Count reported/Valid under water/Compared given the model’s depth

CF Buoy

Legend

= Model Station

= Observed Station

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Approaching the Saybrook Channel , just off the tip of Dunks Island lies the “Saybrook Breakwater Light” station.

• Station Name : Saybrook Breakwater Light

• Station Nick Name: SBL-10

48 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 2.0%

Observed Magnitude for M

₂

= 0.71m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.01m/s

*Count reported/Valid under water/Compared given the model’s depth

Saybrook Breakwater Light

Legend

= Model Station

= Observed Station

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The “Plum Gut” station lies to the South of Plum Island in narrow channel

between the Island and the mainland to the Southwest.

• Station Name : Plum Gut

• Station Nick Name: PG-10 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 7.6%

Observed Magnitude for M

₂

= 1.02m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.08m/s

*Count reported/Valid under water/Compared given the model’s depth

Plum Gut

Legend

= Model Station

= Observed Station

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The “PI Buoy” station lies to the North of Plum Island and Northwest of Great Gull Island.

• Station Name : PI Buoy

• Station Nick Name: PIB-10

54 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 8.3%

Observed Magnitude for M

₂

= 0.92m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.08m/s

*Count reported/Valid under water/Compared given the model’s depth

PI Buoy

Legend

= Model Station

= Observed Station

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Off of the Southeastern tip of Great Gull Island, the “Great Gull Island”

Station falls in a narrow stretch between Plum Island and the Great Gull island.

• Station Name : Great Gull Island

• Station Nick Name: GGI-10 Note:

Legend

= Model Station

= Observed Station

Percent Error in reference to the Current Along PCD for M

₂

= 7.6%

Observed Magnitude for M

₂

= 1.13 m/s

Difference Between Observed & Modeled Magnitudes for M

₂

= 0.09m/s

*Count reported/Valid under water/Compared given the model’s depth

Great Gull Island

Legend

= Model Station

= Observed Station

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