Nalazite se na CroRIS probnoj okolini. Ovdje evidentirani podaci neće biti pohranjeni u Informacijskom sustavu znanosti RH. Ako je ovo greška, CroRIS produkcijskoj okolini moguće je pristupi putem poveznice www.croris.hr
izvor podataka: crosbi

Justifying the WKB approximation in pure katabatic flows (CROSBI ID 120297)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Grisogono, Branko ; Oerlemans, Johannes Justifying the WKB approximation in pure katabatic flows // Tellus. Series A, Dynamic meteorology and oceanography, 54 (2002), 5; 453-462. doi: 10.3402/tellusa.v54i5.12166

Podaci o odgovornosti

Grisogono, Branko ; Oerlemans, Johannes

engleski

Justifying the WKB approximation in pure katabatic flows

Pure katabatic flow is studied with a Prandtl-type model allowing eddy diffusivity/conductivity to vary with height. Recently we obtained an asymptotic solution to the katabatic flow assuming the validity of the WKB method, which solves the fourth-order governing equation coupling the momentum and heat transfer. The WKB approximation requires that eddy diffusivity may vary only gradually compared to the calculated quantities, i.e., potential temperature and wind speed. This means that the scale height for eddy diffusivity must be higher than that for the calculated potential temperature and wind speed. The ratio between the maximum versus the mean eddy diffusivity should be less than that for the scale heights of the diffusivity versus the calculated quantities (temperature and wind). Here we justify (a posteriori) the WKB method independently based on two arguments: (i) a scaling argument and (ii ) a philosophy behind a higher-order closure turbulence modeling. Both the eddy diffusivity maximum and the level of the relevant maximum turbulent kinetic energy are above the strongest part of the nearsurface inversion and the low-level jet which is required for the WKB validity. Thus, the numerical modeling perspective lends credibility to the simple WKB modeling. This justification is important before other data sets are analyzed and a parameterization scheme written.

WKB ; katabatic flow

Napisano za vrijeme izvanrednog profesorstva u Stockholmu.

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

Podaci o izdanju

54 (5)

2002.

453-462

objavljeno

0280-6495

1600-0870

10.3402/tellusa.v54i5.12166

Povezanost rada

Geologija

Poveznice
Indeksiranost