Objetivo
A SERIES OF FULL-SCALE AEROSOL-DIFFUSION EXPERIMENTS, REPRESENTATIVE FOR RADIONUCLIDE BEHAVIOUR IN THE ENVIRONMENT, ARE PROPOSED FOR RATIONAL EVALUATION OF MODELLING UNCERTAINTIES IN ATMOSPHERIC DISPERSION MODELS USED IN PROBABILISTIC ACCIDENT CONSEQUENCE CODES.
CURRENTLY USED ATMOSPHERIC DISPERSION MODELS SHOW A LARGE SPREAD IN THEIR RESULTS FOR THE NEAR-SITE REGION. THIS CALLS FOR FULL-SCALE STUDIES OF FLUCTUATING PLUME CONCENTRATIONS SUPPORTED BY A FULL COMPLEMENT OF METEOROLOGICAL MEASUREMENTS. THESE ARE NEEDE FOR THE IDENTIFICATION AND ESTIMATION OF THE MAJOR CONTRIBUTORS TO THE EXPECTED OVERALL MODELLING UNCERTAINTIES, INCLUDING THE INHERENT NATURAL UNCERTAINTY IN CONCENTRATION PREDICTIONS AND SAMPLING TIME EFFECTS.
Full scale diffusion experiments with continuous, surface releases of submicron aerosol plumes were conducted. For a variety of different atmospheric stability and wind conditions, measurements were obtained of the ground level, cross wind plume concentration profile, with high spatial (1.5 m) and temporal (3 s) resolution using light detection and ranging (LIDAR). Statistics of the concentration fluctuations across the plume have been investigated. In particular, we have distinguished between fixed and moving frame statistics, in order to differentiate between absolute and relative type diffusion. This borex database provides the radiation protection programme with a series of near site reference dispersion experiments in which the inherent, naturally occurring fluctuation levels have been investigated. It establishes a reference for intercomparison and evaluation of near site atmospheric dispersion models.
IT IS PROPOSED TO ESTABLISH A NEAR-REGION DATABASE FOR ATMOSPHERIC DISPERSION, CONSISTING OF NEAR-GROUND MEAN AND MEAN-SQUARE HORIZONTAL CONCENTRATION PROFILES FROM MEASUREMENTS OF DETAILED CONCENTRATION FLUCTUATIONS WITH HIGH SPACE AND TIME RESOLUTION. THE INCLUSION OF IMPORTANT METEOROLOGICAL MEASUREMENTS WILL ESTABLISH THE INFORMATION NECESSARY FOR SUBSEQUENT EVALUATION OF ATMOSPHERIC DISPERSION MODELS WITH RESPECT TO THEIR PREDICTABILITY AT DIFFERENT DOWNWIND DISTANCES, AND AT DIFFERENT ATMOSPHERIC STABILITY-CATEGORIES.
IN ADDITION TO THE COLLECTING OF A COMPLETE SET OF METEOROLOGICAL SURFACE LAYER PARAMETERS, THE MOST IMPORTANT DATA IN THE PROPOSED RESEARCH WILL BE BASED ON REMOTE PLUME-CONCENTRATION PROFILES USING A DFVLR-MINILIDAR SYSTEM. ITS PRINCIPLE OF OPERATION IS SIMILAR TO THAT OF A RADAR: PULSED LASER RADIATION IS TRANSMITTED INTO AN ARTIFICIAL PRODUCED AEROSOL SMOKE PLUME, AND BACK-SCATTERED LIGHT RETURNS INTO A TELESCOPE WITH A PHOTO-DETECTOR. THE TIME BETWEEN TRANSMISSION AND RECEPTION OF A LIGHT PULSE INDICATES THE RANGE FROM THE LIDAR, AND THE INTENSITY OF THE BACK-SCATTERED SIGNAL CAN UPON DATA-PROCESSING BE RELATED TO THE INSTANTANEOUS CONCENTRATION.
METEOROLOGICAL MEASUREMENTS WILL SIMULTANEOUSLY BE TAKEN BOTH AT THE SOURCE POINT AND, AT A REPRESENTATIVE POINT DOWNSTREAM FROM TWO 10-METER HIGH MASTS, EACH EQUIPPED WITH A 3-DIMENSIONAL SONIC ANEMOMETER-THERMOMETERS CONNECTED TO ONLINE FAST-SCANNING DATA ACQUISITION SYSTEMS. THESE SYSTEMS PROVIDE 10-MINUTE AVERAGE VALUES OF THE MEAN WIND SPEED AND DIRECTION IN ADDITION TO THE CO-VARIANCE MATRIX OF THE WIND COMPONENTS U, V, W AND TEMPERATURE T. IMPORTANT QUANTITIES SUCH AS INTENSITIES, SHEAR STRESS AND HEAT FLUXES FOR DETERMINATION OF THE TURBULENCE LEVEL AND THE ATMOSPHERIC STABILITY IS THEREBY PROVIDED. IN ADDITION, ANALOG RECORDING OF THE SIGNALS WILL BE PERFORMED FOR SUBSEQUENT DIGITIZING AND SPECTRAL ANALYSIS, AND ALSO FOR PLUME ADVECTION IN CERTAIN TYPES OF DISPERSION MODELS.
FLAT HOMOGENEOUS EXPERIMENTAL SITES, REPRESENTATIVE OF THE TERRAIN TREATED BY NEAR-SITE ATMOSPHERIC DISPERSION MODELS, WILL BE SELECTED FROM PREFERRED LOCATIONS AT THE BORRIS MOORS (DENMARK) OR ALTERNATIVELY AT MEPPEN (FEDERAL REPUBLIC OF GERMANY).
A POWERFUL AND STURDY ARTIFICIAL SMOKE GENERATOR WILL PRODUCE CONTINUOUS NON-TOXIC WHITE SMOKE PLUMES OF SUB-MICRON AEROSOLS (CONSISTING OF CONGLOMERATED SIO2 AND NH4 MOLECULES) THAT IS EASILY DETECTABLE BY THE LIDAR. LIDAR-MEASUREMENTS OF THE CROSS-WIND GROUND-LEVEL CONCENTRATION PROFILES WILL TAKE PLACE AT THE DOWNWIND DISTANCES 31.25 M, 62.5 M, 125 M, 250 M, 500 M, 1 KM, 2 KM, 4 KM AND POSSIBLY ALSO AT 8 KM.
SONIC ANEMOMETERS, PLACED 10 M ABOVE THE GROUND BOTH AT THE SOURCE LOCATION AND ALSO AT A REPRESENTATIVE LOCATION DOWNWIND, WILL ACHIEVE FULL DOCUMENTATION OF BOTH THE MEAN FLOW AND OF THE TURBULENCE FIELDS. SIMULTANEOUSLY CONDUCTED SF6-TRACER DISPERSION EXPERIMENTS WILL PLAY AN IMPORTANT ROLE IN OBTAINING THE BEST POSSIBLE ABSOLUTE CALIBRATION OF THE LIDAR.
SELECTED EXPERIMENTS WILL BE ACCOMPANIED BY AERIAL PHOTOGRAPHS OF THE VISIBLE SMOKE-PLUME, A TECHNIQUE THAT EARLIER HAS PROVEN POWERFUL FOR VISUALISATION OF THE INSTANTANEOUS HORIZONTAL PLUME OUTLINE.
FOLLOWING INITIAL LIDAR-CALIBRATION EXPERIMENTS, IT IS INTENDED TO CONDUCT TWO EXTENSIVE EXPERIMENTAL CAMPAIGNS, ONE TO TWO WEEKS DURATION EACH, PREFERABLY AT TWO DIFFERENT SEASONS. EXPERIMENTS, EACH OF SEVERAL HOURS CONTINUOUS DURATION, WILL START THROUGHOUT THE DAY (MORNING, NOON, AFTERNOON, EVENING) IN ORDER TO COVER AS MANY DIFFERENT STABILITY-CATEGORIES AS POSSIBLE.
Ámbito científico (EuroSciVoc)
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
- ciencias naturales informática y ciencias de la información base de datos
- ingeniería y tecnología ingeniería eléctrica, ingeniería electrónica, ingeniería de la información ingeniería electrónica sensores sensores ópticos
- ingeniería y tecnología ingeniería eléctrica, ingeniería electrónica, ingeniería de la información ingeniería de la información telecomunicación radiotecnología radar
- ciencias naturales ciencias físicas óptica física del láser láseres pulsados
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Programa(s)
Programas de financiación plurianuales que definen las prioridades de la UE en materia de investigación e innovación.
Programas de financiación plurianuales que definen las prioridades de la UE en materia de investigación e innovación.
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Las convocatorias de propuestas se dividen en temas. Un tema define una materia o área específica para la que los solicitantes pueden presentar propuestas. La descripción de un tema comprende su alcance específico y la repercusión prevista del proyecto financiado.
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Procedimiento para invitar a los solicitantes a presentar propuestas de proyectos con el objetivo de obtener financiación de la UE.
Régimen de financiación
Régimen de financiación (o «Tipo de acción») dentro de un programa con características comunes. Especifica: el alcance de lo que se financia; el porcentaje de reembolso; los criterios específicos de evaluación para optar a la financiación; y el uso de formas simplificadas de costes como los importes a tanto alzado.
Régimen de financiación (o «Tipo de acción») dentro de un programa con características comunes. Especifica: el alcance de lo que se financia; el porcentaje de reembolso; los criterios específicos de evaluación para optar a la financiación; y el uso de formas simplificadas de costes como los importes a tanto alzado.
Coordinador
4000 ROSKILDE
Dinamarca
Los costes totales en que ha incurrido esta organización para participar en el proyecto, incluidos los costes directos e indirectos. Este importe es un subconjunto del presupuesto total del proyecto.