Numerical simulation of daytime mesoscale flow over highly complex terrain: Alps case
The mathematical models used to reproduce the mesoscale flow over terrains belonging to large mountain structures (eg Alps) must possess, besides the non-hydrostatic option, the ability to resolve the ground irregularities as realistically as possible. The increase of the spatial resolution would improve the terrain representation, but might require a prohibitively large central processing unit (CPU) time and computer memory. DELTA-ADREA-DIPCOT is a numerical prediction code system, specifically designed to perform mesoscale wine field and dispersion calculations over terrains of high complexity, using moderate spatial resolution. This is achieved by recognizing subgrid ground features, such as slope and orientation variations, through a ground surface resolution higher than the one used for the atmosphere. The code system has been applied, focusing on the mesoscale meteorological systems over the Alpine mountainous area. The tracer concentration distribution is also examined, mainly as a further support to the meteorological conclusions. The predictions are compared with corresponding measurements and show a favourable agreement.
Bibliographic Reference: Article: Atmospheric Environment, Vol. 32 (1998) pp. 1301-1316
Record Number: 199811084 / Last updated on: 1998-09-28
Original language: en
Available languages: en