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SABLAM System Status

This report details the SABLAM system's operational status as it integrates tidal and wind-driven boundary conditions (BCs) for the East Coast. Utilizing a nested SABLAM mesh for both hindcast and forecast, the system operates from the UNC's South Atlantic Bight model. Daily cycle and assimilation processes are outlined, with a focus on data assimilation, initialization, and error minimization through advanced computational techniques. The document discusses the importance of Accurate Data Collection and processing (ADCP) across various locations and the impact of boundary conditions on forecasting accuracy.

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SABLAM System Status

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  1. SABLAM System Status Brian Blanton, UNC JAX, FLA 27 May, 2003

  2. SABSOON/SABLAM Region East Coast Domain for Tidal/Wind-Driven BCs for Limited-Area Mesh Nested SABLAM Mesh for Hindcast/Forecast System Obs. Locations: Water Level SABSOON ADCP NC 25m SC 50m 200m GA 3000m 1000m FL

  3. SABSOON operating towers = Operating towers = Coming Soon

  4. Daily Cycle Timeline Assimilation Period Version 2 With DA 84hr FC -MMZ -NNZ 00Z HC RAMPUP Coldstart TS Initialization ADCIRC BCs

  5. During DA period…

  6. UNC’s South Atlantic Bight Limited Area Model @ the North Carolina Supercomputer Center Initialization • Climatology • Eventually, (soon) HYCOM/GODAE

  7. UNC’s Nowcast/Forecast System (2) Wind+Tide Data Assimilation Component

  8. UNC’s Nowcast/Forecast System (3) Far-Field computation of Wind+Tide

  9. UNC’s Nowcast/Forecast System (4) • Exact inverse of • frequency-domain • version of forward • model • Used to de-tide error • Memory-intensive • Formal adjoint of linearized forward model • Solution via Conjugate Gradient • Works primarily in the weather band • Time-consuming

  10. Minimize “error” by adjustment of OBC’s Prior Misfit = Observation –model Boundary Regularization Terms Bndy Elevation Bndy Slope Bndy Tendency

  11. Assimilated ADCPs

  12. Mean over Prior (Eta winds + ADCIRC open bcs)

  13. Mean over Posterior (Prior + DA)

  14. Mean Posterior-Prior

  15. Casco Time-dependent BC Adj’s

  16. Weather-band Longshore ADCP Prior RMS= .067 m/s Post RMS= .057 m/s

  17. Casco Cost Function (W)

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