SRDG April2011

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Brief description of SUNTANS model implementation to research hydrodynamic characteristic of the Pentland Firth

Transcript of SRDG April2011

  • 1. Stromness, 27 thFebruary 2011 SUNTANS ModelPentland Firth and Orkney Waters Dr. Susana Baston Meira ICIT-International Centre for Island Technology Heriot-Watt University, Orkney Campus

2. Research Team

  • Dr Susana Baston Meira, ICIT H-W
  • Dr Rob Harris, ICIT H-W
  • Prof Jon Side, ICIT H-W
  • Dr Karl Stephen, IPE H-W
  • Prof Margot Gerritsen, Stanford University

3. Contents

  • Introduction to Numerical Flow Modelling
  • SUNTANS Model description
  • Implementation at PF & OW
  • Focus of Present Research

4. Introduction to Numerical Flow Models

  • Description of water column structure
  • Estimation of energy resource
  • Evaluation of scales of resolution
  • Physical environment changes
  • Shoreline morphodynamic alteration
  • Larvae and pollutants transport

Of Interest,2D & 3D models 5. Introduction to Numerical Flow Models Information in z-coordinate TELEMAC-3D SUNTANS S tanfordU nstructuredN on-hydrostaticT errain followingA daptiveN avier-StokesS imulator ROMS R egionalO ceanM odelS ystem POM P rincetonO ceanM odel MIKE-3D FVCOM F initeV olumeC omunnityO ceanM odel COHERENS CO upledH ydrodinamicE cological model forRE gio N alS helf Seas ADCIRC A (parallel)AD vancedCIRC ulation model for Oceanic, Coastal and Estuarine waters 3-D Hydrodynamic Models 6. SUNTANS Model: Definition SUNTANS is a numerical model designed for the simulation of complex,non-hydrostatic , coastal, river and estuarine flows, with high resolution onunstructured gridsusing parallel computers. 7. SUNTANS Model: Primary Publications

  • O. B. Fringer, M. Gerritsen, and R. L. Street, 2006. "Anunstructured-grid, finite-volume, nonhydrostatic, parallel coastal-ocean simulator ", Ocean Modelling, 14 (3-4), 139-278.
  • O. B. Fringer, 2009, "High-resolution 3D hydrodynamics and sediment transport modeling of San Francisco Bay
  • O. B. Fringer, 2009, "Towards nonhydrostatic ocean modeling with large-eddy simulation
  • B. Wang, O. B. Fringer, and E. S. Gross, 2010, "Understanding turbulent mixing in a partially stratified estuary using SUNTANS"
  • D. Kang and O. B. Fringer, 2010, "On the calculation of available potential energy in internal wave fields ", J. Phys. Oceanogr., 40 (11), 2539-2545.

8. SUNTANS Model: Why?

  • Open source : Accessible to a wide research community
  • Three-dimensional approach : Resolves vertical flowcharacteristics
  • Unstructured grid : Provides exceptional resolution around fine-scale features
  • Parallel Implementation : Facilitates high resolution, efficient computational use
  • Active, developing, research community : H-W links with Stanford University

9. SUNTANS Model: Open Source Why not Mike-3D? Commercial software Why not Telemac? Only 2D open source Why not FVCOM? Non-hydrostatic version yet to be testedUnstructured 10. SUNTANS Model: Unstructured Unstructuredgrid,Terrain-following adaptive SUNTANS employsaz-level grid Structured grid Unstructured grid z-coordinate isopycnal coordinate -coordinate

  • Vertical discretisation:
  • z-coordinate models
  • isopycnal models
  • -coordinate models

11. SUNTANS Model: Nonhydrostatic It is ideally suited to modelling regions ofhigh turbulenceincludingdensity gradients Fringer, O., McWilliams, J. & Street, R., 2006. A New Hybrid Model for Coastal Simulations.Oceanography , 19(1), 65-77. SUNTANS isNon-hydrostaticSolves vertical acceleration and friction 12. Implementation: PF & OW Computational requirements Model is installed on the IPE cluster in Edinburgh. It has10-node of 8 processors.Operating system: Linux Initial conditions : -- Quiescent free surface and velocity field -- No stratification Boundary conditions : They are given by the first eight tidal constituents computed by OTIS 38,342 cells, 20 levels, t=2s, Run Time 14 hours, Simulation 3 days, 6 processors 13. Implementation: PF & OW 25708 cells,20 z-levels,t=2s,Run Time 12 hours,Simulation 3 days,4 processors 14. Implementation: PF & OW 38342 cells, 10 levels, t=5s, Run Time 1 day, Simulation 10 days, 2 processors 15. Implementation: PF & OW Point 1 ComparisonSUNTANS-OTIS 16. Implementation: PF & OW The UKHO provided Gardline with three target locations forthe deployments as follows: Data: One month of velocity averaged every 10 minutes 11:35 14/09/01 71 m 002 58 35W 58 40 13N 3 12:01 14/09/01 80 m 003 05 09W 58 43 01N 2 12:30 14/09/01 82 m 003 14 11W 58 43 34N 1 TIME DEPLOYED DEPTH LONGITUDE LATITUDE SITE 17. Implementation: PF & OW 18. Focus of Present Research

  • Development of model, spatial and temporal resolution
    • Validation against field data / other theoretical models
    • Improved bathymetry
    • Seabed friction coefficient
  • Identification and Characterisation of PF waters
    • Turbulence, identification of eddies
    • Mixing process, density stratification
  • Evaluation of energy resource
    • Velocity profile characteristics
    • Energy extraction, available resource, farm size / layout
  • Environmental impacts
    • Site characteristics, scale, layout, near / far field effects

19. Email: Web: Thanks for your attention! 20.