physical forces nickitas georgas

8/21/2019 Physical Forces Nickitas Georgas

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Evaluate the following physical forces along the Hudsons shores:

GROUP A

CurrentsWaves

GROUP B

IceWakes

Numerical Modeling

Empirical Data


3/24

Depth, mHudson region of the 7-state-wide,

Stevens NYHOPS OFS.

A great forecast model

used by the NWS,USCG SAR, NOAA HAZMAT,

Hudson River Pilots, among others.

The NYHOPS OFS grid includes the

whole tidal Hudson up to Troy.

But the computational grid is

somewhat coarse.

2,444 boxes used to describe the

Hudson from Battery to Troy.

www.stevens.edu/NYHOPSThe Battery

Poughkeepsie

Poughkeepsie

Troy
http://www.stevens.edu/NYHOPShttp://www.stevens.edu/NYHOPS


4/24

Depth, mBased on the NYHOPS hydrodynamic

model, we built an ultra-high

resolution grid.

And then coupled the forces that

move the water to it, in a more

accurate and distributed manner.

E.g. Better shoreline definition,tributary networks, etc.

2,444 boxes in NYHOPS OFS ->

77,452 boxes up to NYSDEC coastline

-> 114,464 boxes up to +10m NAVD88

contour.

Almost two orders of magnitude

increase in generated information.

The Battery

Poughkeepsie

Poughkeepsie

Troy


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Anticipated products from the numerical model

Basic (mean and standard deviation)

and probability statistics (percentiles) for:

Water Level

Depth-averaged Current Components (u, v)

Depth-averaged SpeedSignificant Wave Height

Peak Wave Period

Vertical Water Level Datum

Based on a 365 day simulation on the ultra res grid.

Time series extracted at each cell on or near the NYSDEC shoreline.

Geo-referenced information (GIS layers).


10/24

Windspeed

m/s

SignificantWaveheigh

t

m

The Battery

GWB

West Point

Poughkeepsie

Albany


11/24

Windspeed

m/s

WaterLevel

m

The Battery

GWB

West Point

Poughkeepsie

Albany

RMS=0.3(0.2%)

RMS=4.3 (3.4%)

RMS=3.6 (3.8%)

RMS=4.4 (4.7%)

RMS=7.0 (5.0%)


12/24

The Battery

GWB

West Point

Poughkeepsie

Albany

Hastings

Pier 40

RMS=0.3 (0.4%)

RMS=2.0 (3.4%)

RMS=3.4 (6.3%)

RMS=3.3 (6.6%)

RMS=2.7 (4.0%)

RMS=2.2 (3.9%)

RMS=1.7 (2.5%)


13/24

Windspeed

m/s

AlongshoreCurrent

m/s

West Point

Poughkeepsie

Albany

MohawkatCo

hoes

m3/s

The river that flows both ways

though not always


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Ultra high resolution model

Computationally expensive

Had to scale floodplain back to the NYSDEC shoreline

Presently on its 5th

month in 2D mode, and counting.

3D takes much longer (a day for a day).

But seems to be creating somewhat better results.


17/24

Hudson River Ice Climatology

A GIS layer of ice probabilities along the Hudson River

Will serve as example for other products:

* Wake Study* Modeling study (waves, currents, water levels)

So lets review in detail


18/24Photo credits: U.S.C.G.

GWB

Troy

West Pt

Norrie Pt

Catskill


19/24

Ice Season: December to March each year

U.S.C.G. files daily ice reports

Available to us since 2005.


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GWB

Troy

West Pt

Norrie Pt

Catskill


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1 2 3 4 5 6

1. Ice regions. 2. Ice occurrence (% of ice season). 3. Prevalent ice type. 4. Median ice covered area, % of region (*).5. Median ice thickness, inches (*). 6. 95th percentile ice thickness, inches (*). (*) When ice present.

POC: Nickitas Georgas ([email protected])


23/24

Journal of Physical Oceanography 2011

Decrease in tidal range

Increase in range

Increase in mean water level setup

Decrease in tidal current range

Only ebb at Albany!

Flood

Ebb

Increase in tidalcurrent range


24/24

Complete floodplain grid to +10m NAVD88 Ice climatology
mailto:[email protected]

physical forces nickitas georgas

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