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FEMA Region 3 Chesapeake Bay Storm Surge Project Computational System. Brian Blanton Senior Research Scientist Renaissance Computing Institute University of North Carolina 12 December 2008 Chapel Hill, NC. RENCI Objective.
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FEMA Region 3Chesapeake BayStorm Surge ProjectComputational System Brian Blanton Senior Research Scientist Renaissance Computing Institute University of North Carolina 12 December 2008 Chapel Hill, NC
RENCI Objective • Extend/augment an existing modeling system into the Chesapeake Bay/Region III geographic area: • Model grids, DEM • Incorporate STWAVE nearshore wave model into computational system • Post-simulation statistical analysis (development of flood-frequency curves from simulations + JPM storm weights) • Coordinate our work with the USACE and partners for data preparation and output data management, grid generation, storm and wind characterization, and wave model integration. • I.e. : Communicate as much of our experience in the North Carolina Floodplain Mapping Project (NCFMP) as possible.
RENCI/IMS Personnel Involved • RENCI • Dr. Brian Blanton : Coastal Oceanographer, Computational Scientist • Margaret Blanchard : GIS/DEM • Ken Galluppi : Management • Howard Lander : Research Programmer • Lisa Stilwell : web design/support • UNC Institute of Marine Sciences • Dr. Rick Luettich : Coastal Oceanographer, ADCIRC Developer • Crystal Fulcher : SMS/ADCIRC grid development
Three primary RENCI Phase 1 Tasks • Task 1 – Assembly of Digital Elevation Model (RENCI/Blanchard) • Existing topo/bathy data into regional, consistent DEM • NCFMP has identified potential issues regarding data quality, bathymetric data, etc. • Task 2 – Grid Development and Modeling Consultation (UNC/IMS-Luettich) • Task 3 – Extend Computational System (RENCI/Blanton)
Computational System Overview • Use NCFMP model system as starting point • “Flexible” use of different ADCIRC grids • Has been ported to different computer systems (IBM BG/L, Dell Clusters) • Incorporate project ADCIRC grids • Incorporate OWI TC96 and STWAVE as modules • Develop flexibility of model choices through well-defined interfaces • Execute validation simulations • Execute probabilistic tropical and extratropical storms
Physical System • Computation of StillWater ELevation and wave SETUP component to total water level due to probabilistic Tropical and ExtraTropical systems. STWAVE ADCIRC
Computational System WaveWatch III for oceanic wave field Wind/Pressure Simulator OWI TC96 and IOKA Wave Force Water level STWAVE for nearshore wave field and radiation stress ADCIRC for SWEL+Setup
Numerical Model Suite • Oceanic waves NOAA WaveWatch3 • Storm Surge ADCIRC • Wave setup STWAVE • Wind/Pressure OWI’s TC96 (tropical) • OWI’s IOKA (extratropical) • Augmentation of existing system with STWAVE and TC96. • Existing system already uses OWI format (NWS12/212) so incorporating TC96 easy. • Wrap STWAVE to “look like” SWAN.
Current Work Items • Compile/test OWI TC96 (done) • Compile parallel STWAVE (done) • Test parallel STWAVE • in progress, with Jane Smith (ERDC) and Harry Friebel (NAP) • 100-500 individual simulations • Order 256 processors per simulation • 2-5 million cpu-hours • Compute Resources TBA Anticipated Computational Effort
STWAVE Scaling • Test problem • 100x100, Gulf of Mexico • 48 hour simulation • 30 minute timestep • 96 time evaluations • Intel Xeon 2.6Gz cluster • About Linear speedup • Don’t have consistent comparison with SWAN yet • Expecting STWAVE to be faster, mostly due to globalization of output. (Handled similar to ADCIRC’s globalization) STWAVE Scaling
NOAA Ches/Del Bay ADCIRC grid • Probably good grid-dev starting point for bathy • Does not support inundation • Bathymetry to be converted to MSL by NOAA • Then to NAVD88 by RENCI for incorporation into DEM database.