4-d coastal ocean dynamics detected by surface current radar and auvs
DESCRIPTION
4-D COASTAL OCEAN DYNAMICS DETECTED BY SURFACE CURRENT RADAR AND AUVs. L. K. Shay Meteorology and Physical Oceanography University of Miami P. Edgar An Ocean Engineering Florida Atlantic University. SCIENTIFIC GOAL: - PowerPoint PPT PresentationTRANSCRIPT
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.
ONR CURRENT EFFORTS NICOP Results (AUV-based
Sampling). COPE 1,3 (HF-Radar Sampling). SFOMC (AUV/VHF-Radar/Mooring-
based Sampling Strategy). Planned:Longer Range 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.
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
Experimental Domain
Sub-Mesoscale Vortex
Vortex Propagation
Surface Current RegimesStrong 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)
Ocean Explorer AUV
AUV Section
AUV Maps
Ship ADCP Transect
ANALYSIS &MODELING
Tidal Height and Current Analysis
Subinertial Flows and Vorticity (CTD)
Near-Inertial Waves (27.4 h )/Winds
IWs (k,l,m,w space) Mixed Layer Flows
(Langmuir Cells)
Grided Obs Initial Conditions for
LES Model Subgrid (<1 Km)
Parameterizations Compare Obs to
Simulations Optimize Adaptive
AUV-Sample Strategy
Ship ADCP/AUV and OSCR Comparison
Mooring Comparison
TIDAL PROCESSES Real Time Tidal Analyses After 7 Days. Sea-Level Variations (Continuity). Prediction versus Analysis (M2 , K1,). Operations: Tidal Prediction (i.e.
Chesapeake Bay). Vertical Structure. AUV Sampling of Surface Current
Signatures.
Tidal Ellipses at Cope
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.