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Joshua Todd Coastal Engineering Department of Marine and Environmental Systems

Development and Implementation of Depth Dependent Wave Forcing and Stokes Drift into Coupled 3D PADCIRC/PUNSWAN. Joshua Todd Coastal Engineering Department of Marine and Environmental Systems Florida Institute of Technology Advisor: Dr. Robert Weaver April 29,2013. Objective.

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Joshua Todd Coastal Engineering Department of Marine and Environmental Systems

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  1. Development and Implementation of Depth Dependent Wave Forcing and Stokes Drift into Coupled 3D PADCIRC/PUNSWAN Joshua Todd Coastal Engineering Department of Marine and Environmental Systems Florida Institute of Technology Advisor: Dr. Robert Weaver April 29,2013

  2. Objective • To modify the three dimensional version of ADCIRC to use wave forcing and mass flux in the calculation of sea surface elevation and current velocities

  3. Background • Stokes 1847 • Study of Water Waves • Longuet-Higgins and Stewart 1962 • Studied shoreward directed momentum flux by water waves • Mellor 2003,2008 • Included wave effects on three dimensional equations of motion in addition to the LHS radiation stress

  4. Modifications • Add three dimensional depth dependent radiation stress to the momentum equations • Add depth dependent Stoke’s drift to the velocity solution

  5. Mellor 2008

  6. Stokes Drift • Incorporates mass transport from waves into the 3D model

  7. SWAN Coupling • Uses SWAN to provide: • Wave Number • Direction • Frequency • Energy (from the Action Density)

  8. Couple2Swan • Added 3D Radiation Stress equation to the ComputeRadiationStress and ComputeWaveDrivenForces Subroutines • Created Compute3DStokesDrift Subroutine • Set up equations to be able to turn them on and off with Input File Flags

  9. VSMY • Added Stoke’s Drift Velocity to the velocity at each node • Added the 3D Radiation Stress to the RHS forcing vector in the VSSOL subroutine

  10. IM Types • 3 Different Models • IM 7 - Depth Dependent Radiation Stress • IM 8- Depth Dependent Radiation Stress and Stokes Drift • IM 9- Stokes Drift

  11. Stability Testing • Hurricane Gustav • EC95 Grid • Quick Run • No Tides • 5 day run • Results Pending

  12. Questions?

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