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HIGH RESOLUTION SURFACE CURRENT MAPPING IN BROWARD COUNTY. L. K. Shay Meteorology and Physical Oceanography University of Miami. SCIENTIFIC GOAL:

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HIGH RESOLUTION SURFACE CURRENT

MAPPING IN BROWARD COUNTY

L. K. Shay

Meteorology and Physical Oceanography

University of Miami

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.

vhf radar
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.
engineering objectives
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
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 design
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.
surface current regimes
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 MISSIONS
move goal
MOVE 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)
applications
APPLICATIONS:
  • Transport of Sand.
  • Beach Renourishment.
  • Sewage Effluent Dispersion.
  • Search/Rescue Operations (Rafters).
  • Cruise Lines.
  • Fishing Industry (Private/Commercial).
  • Ecology/Biological of Coral Reefs
frontal passage april 8 9 2000
FRONTAL PASSAGEApril 8-9 2000

http://storm.rsmas.miami.edu/awe00/

future research
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
summary
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 Policy Makers.