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Navy Modeling Activities
Presented by Erick Rogers“Ocean Dynamics and Prediction” Branch of the Oceanography Division of the Naval Research Laboratory
Forecasting Systems
Fleet Numerical (official forecasts) Naval Oceanographic Office (official) Naval Research Laboratory
(technology demonstrations, realtime but pre-operational products)
FNMOC (Fleet Numerical Meteorology and Oceanography Center) (Monterey, CA)
FNMOC wave models: limited to global and regional
Example FNMOC web page
FNMOC wave products
Example FNMOC product (output from global model)
FNMOC wave products
Example FNMOC web page (output from one regional model)
FNMOC wave products
Example FNMOC product (output from one regional model)
FNMOC meteorological products
Example FNMOC product (surface winds from one regional model)
NAVO (Naval Oceanographic Office)
NAVO wave models: (officially) limited to sub-regional and coastal applications
Example NAVO web page and graphic from a sub-regional application (SWAN)
The Naval Research Laboratory
• Navy’s corporate laboratory
• Three campuses:
• Washington DC
• Stennis Space Center, MS
• Monterey, CA
• Basic (6.1) through applied (6.2) research, technology transfer (6.4), technology demonstration
• Primary funding from ONR
• Compete internally for block funding from ONR (very competitive)
• Make up remainder with funding from SPAWAR (6.4) or direct proposals to ONR programs (also very competitive)
Circulation modeling at NRL
Example NRL realtime circulation model webpage (Global NCOM)
Circulation modeling at NRL
Example NRL realtime circulation model graphics (Global NCOM). Potential uses:• search and rescue • spill mitigation
NRL Oceanography Division, Waves Group
Richard A. Allard (6.4) – Transitions of technologies to operations; rapidly relocatable modeling systems; head of coastal oceanographic modeling Section
James D. Dykes (6.4) – Transitions; Forecast system development; Delft3d implementation/validation; hindcasting; parallel computing; meteorological modeling
Kacey L. Edwards (6.1, 6.2) – Phase-resolved modeling; Nearshore breaking and nonlinear interactions
Y. Larry Hsu (6.4) – Transitions; Delft3d implementations; Navy Standard Surf Model; Lagrangian swell modeling; model validation
Paul Hwang (6.1) – Physical Oceanography; basic processes theoretical research; gravity-capillary waves; air-sea interaction; airborne remote sensing of waves
James M. Kaihatu (6.1, 6.2) – Phase-resolved model development; nearshore breaking and nonlinear interactions; data assimilation; wave-induced circulation; AUVs
W. Erick Rogers (6.2, 6.4) – Phase-averaged model development/validation; global, regional, sub-regional applications; remote sensing applications; forecasting systems
Jay Veeramony (6.1, 6.2) – Phase-resolved model development; turbulence and vorticity; nonlinear interactions; surf zone processes; nearshore wave breaking
David Wang (6.1) – Physical Oceanography; ship-borne experiments; data processing; basic processes research; sea-swell separation; extreme waves; wavelet and HHT
NRL Oceanography Division, Waves Group: Model Suite
Global, regional wave applications WAVEWATCH-III WAM (phasing out)
Subregional, coastal wave applications SWAN STWAVE (phasing out)
Wave-induced circulation Delft3D 1D Surf Model (phasing out)
Research codes REF/DIF1, REF/DIF-S, REF/DIF-SNL Boussinesq models (time-domain and frequency
domain)
Coastal Storms Program (CSP) (Sponsor: NOAA)
NRL Washington/Oregon Wave Forecasting System
Example forecast: 1200 UTC June 17 2005
http://www7320.nrlssc.navy.mil/CNW/
CSP Wave forecasting system
2D Graphics: Wave height, mean direction, wind speed, direction
Forcing from NCEP regional model
WA/OR system is one of three systems created by NRL for NOAA. (Support to NRL ~30k/yr)
CSP Wave forecasting system
6 Computational Grids for the WA/OR System:• 1 outer grid• 1 shelf grid• 3 3rd level nest• 1 4th level nest
CSP Wave forecasting system
Mouseover to view• prior analyses• present analysis• forecasts
Example 2D Graphic
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
CSP Wave forecasting system
Wave forecasts for the Columbia River nest include water level and current forcing provided by the Oregon Graduate Institute (available as experimental product on ftp site)
CSP Wave forecasting system
CSP Wave forecasting system
Example current forcing for experimental Col. R. nest
Wave Climatologies
Climatologies (Jim Dykes)
Climatologies (Jim Dykes)
From global climatology database
Model Development, Validation, and Related Research
Example of research and model development: Wave Propagation Over Viscous Muds
Collaborators: Alexandru Sheremet, Louisiana State University
Jim Kaihatu, Erick Rogers, NRL-Stennis
Cassino Beach, Brazil
Less mud, more breaking
More mud, less breaking
Formula describing wave attenuation by viscous mud layer has been implemented and tested in SWAN wave model. (Validation forthcoming)
Spectrum from WW3(NW location)
Spectrum from WW3(SW location, used to force SWAN)
CDIP buoy(NW location)
This component not measured by nearby CDIP buoyshown here
Spurious swell component exists here also
Spurious swell from southwest exists in the boundary forcing from WW3 ENP model
Oct 22 – Nov 8: study of swell forcing
Investigations of Wave Model Error, first example
Model uses DIA, but spreading is not overpredicted in the mean
Advanced validation of wave models: validation of directional spreading
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WSPD (m/s) ; YY2003 MM01 DD21 HH15
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QuikSCAT data within ±6 hours of analysis time
Gaps filled in by blending with operational NOGAPS analyses
Wind analysis for Jan. 21. 1500Z, 2003
Utilizing remote sensing to determine source of model error
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Variance Density (m2/Hz) at 0.056 Hz ; DD11 ; HH12
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; Jan. 11, 2003, 1200 UTCW
ave
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Utilizing remote sensing to determine source of model error
Winter 2001/2002
Utilizing remote sensing to determine source of model error
SWAN error comparison at gage 10 (= normalized rms error)
baseline: REF/DIF model (no diffusion) =0.17
Equal resolution (xy=200m) BSBT
=0.74 SORDUP
=0.31 SL1
=0.25
Equivalent computation time BSBT (xy = 100 m)
=0.55 SORDUP (xy =
100m ) =0.26
SL1 (xy = 400 m ) =0.42
is a measure of relative erroris a measure of relative error
Investigations of Wave Model Error, second example
Evaluation of SWAN and WAVEWATCH3 for Hurricane Ivan (this is WW3)
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Wave measurements in the eye of Hurricane Ivan
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2004-09-15 15:59:58
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2004-09-15 23:59:55
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2004-09-16 07:59:53
SEED3
readWTfiles J:\SEEDDATA\WaveTide\SEED1\11127testingxxx.w t
Wave measurements in the eye of Hurricane Ivan
The End
6.2 ONR / 6.4 SPAWAR
Objective: Develop a nowcasting system for nearshore waves and circulation which combines bathymetry melded from various sources (including on-scene UUVs) with a nearshore modeling system forced by an integrated ocean predictionsystem
Approach:
• Evaluate Delft3D nearshore modeling system and integrate it with forcing fromDIOPS regional modeling system• Develop standalone implementation of modeling system which allows localobservations to be input as forcing for real time nowcast• Develop methodologies to meld UUV bathymetry with historical data and provideestimate of error
Project Title: Development of an AUV-Fed NearshoreNowcasting System
Co-investigators:
• Jim Kaihatu, Richard Allard, Todd Holland (7440), Brian Bourgeois (7440)
Application to CJTFEX 2004
• DIOPS SWAN forcing Delft3D
• Delft3D set up in UUV operating areas
Delft3D forecast waves and currents every 6 hours Sig. Wave
Ht.
0.7m
1ktU,V
Bathymetry updated with UUV measurements
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6.2 ONR / 6.4 SPAWAR Project Title: Development of an AUV-Fed Nearshore Nowcasting System
Generational Improvement in Operational Forecasting Capability
Previous nearshore operational capability: Navy Standard Surf Model One-dimensional Overly constrained: breaking waves
longshore currents Delft3D system now embedded at
Mission Support Center Communicates with DIOPS MSC scientists trained on DIOPS and Delft3D
Example Development/Validation Project: Random Wave Forcing of Nearshore Circulation
Validation of the REFDIFS-SHORECIRC combination atDuck94.
Top panel is the model-predicted magnitude of the cross-shore velocity.[red is shoreward (to the left), blueis seaward (to the right)]
Bottom panel is the velocity profile of the current (solid lines) comparedto measurements (+).
6.2 ONR / 6.4 SPAWAR Project Title: Development of an AUV-Fed Nearshore Nowcasting System
Bathymetric Update
Delft3D
DIOPS
Matlab Graphics Output
Automatically run for forecast cycle
Bathymetric Interpolator by Holland, et al.
Delft3D
Bathymetric Update
Delft3D
Transport to scene
Matlab Graphics Output
Wave input based on local observations
DIOPS for Tides
Bathymetric Interpolator by Holland, et al.
Coupled DIOPS/Delft3D System Standalone Delft3D
WW3 Significant Wave Height SE Asia, SeptemberResolution: 1 deg spatial, 3 hr temp
James Dykes, NRL-SSC, provided original plots . NRL-SSC will build 10 yr WW3 data sets for selected enclosed basins, such as Persian Gulf, at .2 deg.
Still need longer time period and higher resolution in space and time.
Long Term Mean (1993-2002)
Anomaly 1999 (La Nina)Anomaly 1997 (El Nino)
Climatologies
Climatologies (Jim Dykes)Domain for Med Sea10-year runs 1992 – 2002 pending