Abstract: There must be many assumptions and constraints to physical simulation. Water can partly replace air medium for physical simulation of atmospheric diffusion as a fluid medium and can be complementary to environmental wind tunnel experiments and other simulation tools. The physical simulation method of towing tank is discussed in this paper. A Planar Laser Induced Fluorescence (PLIF) technology was used to establish a set of methods for concentration field measurement suitable for atmospheric diffusion towed flume, which was preliminarily applied in pollution diffusion research near simple standards bodies. Results showed that some cases of atmospheric diffusion could be simulated, and different atmospheric conditions affecting pollutant concentration distribution could be derived using this method.

Key words: towing water tank, Planar Laser Induced Fluorescence, atmospheric diffusion