Turbulence models in the atmospheric boundary layer under convective conditions

Bruno, Olimpia (2014) Turbulence models in the atmospheric boundary layer under convective conditions. [Laurea magistrale], Università di Bologna, Corso di Studio in Fisica [LM-DM270]
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In this work a modelization of the turbulence in the atmospheric boundary layer, under convective condition, is made. For this aim, the equations that describe the atmospheric motion are expressed through Reynolds averages and, then, they need closures. This work consists in modifying the TKE-l closure used in the BOLAM (Bologna Limited Area Model) forecast model. In particular, the single column model extracted from BOLAM is used, which is modified to obtain other three different closure schemes: a non-local term is added to the flux- gradient relations used to close the second order moments present in the evolution equation of the turbulent kinetic energy, so that the flux-gradient relations become more suitable for simulating an unstable boundary layer. Furthermore, a comparison among the results obtained from the single column model, the ones obtained from the three new schemes and the observations provided by the known case in literature ”GABLS2” is made.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Bruno, Olimpia
Relatore della tesi
Corso di studio
Curriculum G: Fisica dell'atmosfera e meteorologia
Ordinamento Cds
Parole chiave
single column model, convective boundary layer, turbulence model
Data di discussione della Tesi
28 Marzo 2014

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