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Modeling simple katabatic flows (CROSBI ID 530178)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Grisogono, Branko ; Kavčič, Iva ; Durran, Dale ; Belušić, Danijel ; Žagar, Mark ; Enger, Leif ; Mahrt, Larry Modeling simple katabatic flows // EMS7/ECAM8 Abstracts. 2007

Podaci o odgovornosti

Grisogono, Branko ; Kavčič, Iva ; Durran, Dale ; Belušić, Danijel ; Žagar, Mark ; Enger, Leif ; Mahrt, Larry

engleski

Modeling simple katabatic flows

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.

Prandtl model; WKB method; Coriolis; mesoscale model; low-level jet; length scale; turbulence

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Podaci o prilogu

2007.

objavljeno

Podaci o matičnoj publikaciji

EMS7/ECAM8 Abstracts

Podaci o skupu

7th EMS Annual Meeting / 8th ECAM

pozvano predavanje

01.10.2007-05.10.2007

San Lorenzo de El Escorial, Španjolska

Povezanost rada

Geologija

Poveznice