James S. Ellis National Atmospheric Release Advisory Center Lawrence Livermore National Laboratory Department of Energy (DOE) OFCM Special Session Atmospheric.

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Presentation transcript:

James S. Ellis National Atmospheric Release Advisory Center Lawrence Livermore National Laboratory Department of Energy (DOE) OFCM Special Session Atmospheric Transport and Dispersion Modeling Support for Homeland Security Panel 3: Developing a Common Framework for Model Evaluation George Mason University Fairfax, Virginia June 19, 2003

JE.CrystalCityEval.12/5/01.lp.Pg.2 Model Evaluation Methodologies Apply analytic solutions to check numerical methods against known solutions Use tracer field experiments to evaluate validity of models for real-world cases Limitations: — Limited number of processes included (e.g., only transport and diffusion of trace gas) — Limited range of source, meteorological and geographical conditions studied Test operational system for ease of use, efficiency and robustness Open literature publication and public availability of the model to allow for scrutiny by the scientific and user communities Evaluate in operational mode or environment Evaluate for unknown source term with tracer material measurements

NARAC Model Testing JN.LasVegas.10/16/2000.lp. Pg.3 Operational testing evaluates the usability, efficiency, consistency and robustness of models for operational conditions Examples: Chernobyl, Kuwait oil fires, tire fires, industrial accidents, Algeciras Spain Cesium release, Tokaimura criticality accident Analytic solutions test models versus known, exact results Field experiments test models in real-world cases Examples: Project Prairie Grass, Savannah River Mesoscale Atmospheric Tracer Studies, Diablo Canyon Tracer Study, URBAN JE.CrystalCityEval.12/5/01.lp.Pg.3

JE.CrystalCityEval.12/5/01.lp.Pg.4 Staten Island, NY Fire Feb. 21, 2003 Through the NYC Office of Emergency Management, LINC/NARAC provided the following operational assistance: Real-time 3-D plume prediction of affected areas and population Guidance for deployment of emergency responders and field monitoring teams Health risk levels for 1-hr and 24-hr exposure (in consultation with NOAA Hazardous Material Response and Assessment Division, Seattle, team) Forecasts of plume spread over next 24 hours NARAC Plumes exported to NYC OEM GIS

NARAC Simulation of Smoke Dispersion From Staten Island Fire Simulated smoke plume Fire location

NARAC Simulation of Smoke Dispersion From Staten Island Fire

JE.CrystalCityEval.12/5/01.lp.Pg.9 Staten Island, New York, Smoke Plume: Feb. 21, 2003 NOAA Satellite image showing smoke plume Photograph of smoke plume looking South from Manhattan

JE.CrystalCityEval.12/5/01.lp.Pg.10 Staten Island, Fire Smoke Plume: Satellite Image ( )

JE.CrystalCityEval.12/5/01.lp.Pg.11 Evaluate in Operational Mode or Environment User wants to know performance in real-world events Establish a number of baseline sites (e.g., city, coastal, mountain, plains) Sites would have advanced observational instrumentation to “well” characterize the atmosphere on an ongoing basis Occasional tracer releases at various times and locations within site area Evaluate plume modeling system with full, subsets and predicted data sets Evaluate for multiple time and spatial scales and resolutions, scenarios, and atmospheric conditions Evaluate observational data needs

JE.CrystalCityEval.12/5/01.lp.Pg.12 Evaluate for unknown source term with tracer material measurements In real-world WMD event source term is usually not known Use meteorological and tracer measurement data sets from sites to evaluate plume modeling system’s ability to reconstruct event Evaluate for accuracy and speed Evaluate effects of uncertainties in data Evaluate sensitivity to various users (reproducibility)