4-d coastal ocean dynamics detected by surface current radar and auvs l. k. shay meteorology and...
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4-D COASTAL OCEAN DYNAMICS DETECTED BY SURFACE CURRENT
RADAR AND AUVsL. K. Shay
Meteorology and Physical Oceanography University of Miami
P. Edgar AnOcean Engineering
Florida Atlantic University
SCIENTIFIC GOAL:
To provide a first-order description of complex oceanic flows and their relationship to surface processes in the littoral ocean subjected to tidal currents, western boundary currents, topographical changes and surface winds.
RESEARCH SUPPORTED BY ONR.
LITTORAL ZONE
Complex Coastal Processes. 2-D/ 3-D Flow Fields. Boundary Current & Topography. Waves & Boundary Layer Winds. Impact: Civilian and US Navy Needs. Radar/AUV/Mooring/Ship-based
Approach. Applicable to Any Theater.
Ocean Explorer AUV
VHF RADAR
Phased Array 32 Elements. Electronic Beam Forming. 700 Cells (250 m resolution). 60 km Square Domain. 20 Minute Sample Cycle. Theoretical Limit 11 km. Spectra and Currents.
ENGINEERINGOBJECTIVES:
Design/Implement Multiple ADCPs as Part of AUV Payload.
Evaluate Side-Looking Beam Orientations.
Map Currents Relate To Surface Dynamics.
Train Next Generation Graduate Students (i.e. Tactical Oceanography)
SCIENCE OBJECTIVES:
Coherent Structures (Vortices, Fronts) Isolate BC and Tidal Flows/Forcing of
Iws At Shelf Break. Expand IWs Into Baroclinic Modes. Determine Wavenumber Spectra. Assess Boundary Layer Processes
During Storm and Quiescent Periods.
Experimental Domain
EXPERIMENTALDESIGN
VHF Mode of OSCR (7x9 km: 250 m Cell Spacing).
Ship-Based CTD/ADCP (2x2 km) 4-AUV Sampling Patterns (0.5-1km). Cyclesonde. NOVA/USF Moorings. NAVY ADCPs.
Experimental Domain
Sub-Mesoscale Vortex
Vortex Propagation
Surface Current Regimes
Strong Florida Current Lobe Structure
AUV MISSIONS
Mixed Layer: (Current and Turbulence)
Tidal Current: Bottom Boundary: Turbulence: Planned Adverse
Weather:
6 and 12-hr repeated grids : 500 m x 500 m.
15-26 hr: 1km x 1km 7 hr: 1 km x .500 km 4-6 hr: 1 km Xsects 12 hr : 500 m x 500
m (March-April 00)
AUV Section
AUV Maps
Ship ADCP Transect
Ship ADCP/AUV and OSCR Comparison
Mooring Comparison
FUTURE RESEARCH
Long-Term Monitoring of Florida Current Using HiFAR (100 km range).
Develop Long-Range AUVs (24-48 hr). Surface/Subsurface Moorings (Cross-
Shelf) Ship-Based Observations (Cross-Shelf) Drifter-Based Deployments Modeling/Assimilation
GOAL:
To assess long-term variability of the Florida Current and its influence on Coastal Circulation and Atmospheric Weather Patterns/Events.
Important to Civilian Needs (Ship Traffic; Pollutant Dispersion; Renourishment.)
Important to Navy (Ship/Radar Signatures; Acoustics;Internal Waves)
SFTF APPLICATIONS
US Navy Coastal Surveys. METOC (JTFX) Operations. Ship-based Operations In Differing
Venues/Theaters. Coupling With Models (i.e. LES). Provides Environmental Data To
Assess Impact on Fleet Operations.
SUMMARY
Synergistic Approach: Synoptic Variability.
Fine-Scale to Submesoscale Processes. 2-D/3-D Variability not Mean. Real Time: JTFX (Ships,Aircraft,AUV). Improve Predictive Capability At Navy
Centers. Train Next-Generation Students.