7.4 Measurement and Modeling of Local Circulation Patterns and Pollutant Dispersion from a Waste Incinerator in the Basin of Bolzano in the Italian Alps

Tuesday, 9 January 2018: 2:00 PM
Salon G (Hilton) (Austin, Texas)
Elena Tomasi, Univ. of Trento, Trento, Italy; and S. Alessandrini, G. Antonacci, L. Delle Monache, M. Falocchi, E. Ferrero, L. Giovannini, P. A. Jimenez, B. Kosovic, and D. Zardi

Results are presented from the Bolzano Tracer Experiment (B-TEX) which was perfomed on 14 February 2017 near the city of Bolzano in the Eastern Italian Alps. The city lies in a basin, surrounded by high alpine crests, where four triburary valleys join. The experiment was part of a project aiming at the optimal design of a permanent air-quality-station network for monitoring long-term effect of pollutants emitted by the incinerator, as well as to outline possible scenarios of pollutant dispersion under accidental release. The experiment included two 1-h-long releases of a passive tracer from the stack of an incinerator plant located south to the city: one during the early morning, under stable meteorological conditions and weak Northerly winds, and the second in the early afternoon, under weak convection and a light Southerly wind. Also a very peculiar feature of the area was detected by wind profilers, i. e. a low-level valley-exit jet entering the basin through one of the tributary valleys outlet. Tracer concentrations were then measured at selected points in the surroundings. Before and during the releases a modelling chain was run coupling the Weather Research and Forecasting (WRF) model with two different dispersion models: the CALPUFF semi-lagrangian gaussian puff model and the SPRAYWEB particle lagrangian model. After the experiment a verifcation of the modelin chain was pefomed, including a sensitivity analysis to initial/boundary conditions as well as to parameterisations of boundary-layer and turbulent dispersion processes and model setup.

Results from the field campaigns, as well as from simulations performed under different model-chain design and setup, are presented and discussed.

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