Measurement of the dynamic characteristics of atmospheric diffusion

Technical Report · Tue Jan 01 04:00:00 EST 1974

OSTI ID:4937425

Rigot-Muller, F

S>Thesis. Submitted to Universite Scientifique et Medicale de Grenoble (France). A method is proposed for studying the diffusion of atmospheric pollutants above real sites, which considers the actual magnitudes encountered. The dynamic appllcation of this method yields original information. In view of justifying the method, fundamental theories concerning diffusion are presented together with different models for the atmosphere. The atmosphere is then considered as a linear filter to which the process identification method is applied. The pulse response of the filter is examined in the pollutant-time plane. The limits of the method and its field of application are discussed. The concepts of ergodism and stationaryness are introduced. Various diffusion experiments carried out under different conditions are reviewed. Information on the effect of obstacles and the roughness of the ground is given together with calculations on the longitudinal diffusion and the transport velocity. A brief description is then given of the apparatus used to measure the concentrations and the meteorologica1 conditions. The correlation calculation is also briefly presented. (auth)

• Research Organization: CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France)
• Sponsoring Organization: Sponsor not identified
• NSA Number: NSA-29-018393
• OSTI ID: 4937425
• Report Number(s): CEA-R--4501
• Country of Publication: France
• Language: French

Related Subjects

AEROSOLS
DIFFUSION
DUSTS
EARTH ATMOSPHERE
MATHEMATICAL MODELS
MEASURING METHODS
METEOROLOGY
MIXING
N44200* --Environmental & Earth Sciences--Radioactive Effluents
N44300 --Environmental & Earth Sciences--Radioactivity Monitoring & Transport
N44500 --Environmental & Earth Sciences--Site Surveys
PARTICLES
RADIOISOTOPES
TRACER TECHNIQUES
TURBULENCE