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Pregled bibliografske jedinice broj: 307590

Zbornik radova

Autori: Grisogono, Branko; Kavčič, Iva; Durran, Dale; Belušić, Danijel; Žagar, Mark; Enger, Leif; Mahrt, Larry
Naslov: Modeling simple katabatic flows
( Modeling simple katabatic flows )
Izvornik: EMS7/ECAM8 Abstracts
Skup: 7th EMS Annual Meeting / 8th ECAM
Mjesto i datum: San Lorenzo de El Escorial, Španjolska, 01-05.10.2007.
Ključne riječi: Prandtl model; WKB method; Coriolis; mesoscale model; low-level jet; length scale; turbulence
( Prandtl model; WKB method; Coriolis; mesoscale model; low-level jet; length scale; turbulence )
Sažetak:
The focus is on analytical and numerical modeling of simple katabatic flows blowing over short and long cool slopes. Since it was verified that classical scaling via Monin-Obukhov length performs over such slopes rather poorly (a low-level jet usually determines the surface fluxes), a modified Prandtl model is used instead. This linear analytic 1D model is extended for 1.) almost any gradual eddy diffusivity K(z) via the WKB method, and 2.) it includes the Coriolis effect. Its asymptotic (WKB) solution is checked against its more complete numerical solution and versus a mesoscale model (MIUU model). The Prandtl model is further used to determine one of the coefficients in the MIUU model turbulence length-scale for stable “ z-less“ conditions, L ; L = min[2a(TKE)ˆ (1/2)/N, a(TKE)ˆ (1/2)/S] where N and S are buoyancy frequency and absolute vertical wind shear and 2a = 0.537 is the standard coefficient in this higher-order turbulence closure scheme. The result can be useful in parameterizing shallow persistent katabatic flows in NWP and climate models, in data interpretation and for improving characteristic length-scales in other numerical models.
Vrsta sudjelovanja: Pozvano
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Nema recenziju
Projekt / tema: 119-1193086-1323, 119-1193086-1311, 037-1193086-2771
Izvorni jezik: eng
Kategorija: Znanstveni
Znanstvena područja:
Geologija
URL Internet adrese: http://www.cosis.net/abstracts/EMS2007/00662/EMS2007-J-00662-1.pdf
Upisao u CROSBI: Danijel Belusic (dbelusic@irb.hr), 10. Lis. 2007. u 08:00 sati



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