Doppler sodar measurements and evaluations in complex terrain

Doppler Sodar data recorded in a complex terrain (Levantina Valley and Gotthard Pass, Switzerland) during the first TRANSALP campaign (an international experimental programme, started in 1989, that is a part of the EUROTRAC-TRACT Subproject) are shown. The exercises consisted of tracer experiments coupled to comprehensive meteorological measurements. The measurements performed by a joint team ENEL-CNR, with the ENEL 3-D Doppler sodar system and the relative elaborations are presented and discussed with the aim of showing the performances of such an instrument in a rather complex terrain and its ability to give information useful for atmospheric-dispersion modelling. To strengthen this statement, a few results from the second TRANSALP campaign are also shown. These results cannot be extrapolated to other sites unless proper tests are carried out.