Aspects of Dosage from Short and Long Duration Emissions

0567094 - ÚT 2023 CZ eng C - Conference Paper (international conference)
Robins, A. - Hayden, P. - Gallacher, D. - Pace, S. - Chaloupecká, Hana
Aspects of Dosage from Short and Long Duration Emissions.
International Workshop on Physical Modeling of Flow and Dispersion Phenomena - Book of Abstracts. Prague: Institute of Thermomechanics of the Czech Academy of Sciences, 2022 - (Jurčáková, K.; Kellnerová, R.), s. 186-190. ISBN 978-80-87012-81-9.
[PHYSMOD 2022 - The International Workshop on Physical Modelling of Flow and Dispersion Phenomena. Praha (CZ), 29.08.2022-31.08.2022]
Institutional support: RVO:61388998
Keywords : wind tunnel * dose * dosage * gas releases
OECD category: Meteorology and atmospheric sciences

The objectives of this work were to use wind tunnel concentration measurements to describe the structure of dispersing clouds from an elevated source in a deep turbulent boundary layer and to develop scaling rules that reduce the results to a universal form. The experiments were carried out in the EnFlo meteorological wind tunnel at the University of Surrey. Ensembles of between 100 and 200
repeat emissions were used, emission durations between 0.067 and 1.02s and a reference flow speed of 2ms-1. The fetch studied extended to about six source heights downwind (about two boundary layer depths). The structure of the evolving clouds was analysed to determine time of flight, along-wind spread and dosage and to compare the dosage behaviour with the concentration field in a plume from the same source. This illustrated how the two were related and how cloud dosage statistics (mean and
standard deviation) could be derived from plume data. It also demonstrated that much larger ensembles were required to reduce the statistical uncertainty in the mean cloud properties. The next steps involve testing these conclusions in a wider range of flow and dispersion conditions, in the presence of obstacles or complex urban areas.
Permanent Link: https://hdl.handle.net/11104/0339222