Applied Modelling Of The Mixing Height Over Heterogeneous Terrain
Author(s)
S.-E. Gryning & E. Batchvarova
Abstract
Applied modelling of the mixing height over
heterogeneous terrain
i <2
S.-E. Gryning & E. Batchvarova
1 2
' Ris0 National Laboratory, Roskilde, Denmark
9
National Institute of Meteorology and Hydrology, Sofia, Bulgaria
Abstract
The use of simple operational commonly applied models for the determination
of the mixing height over non-homogeneous terrain is considered. The study is
restricted to unstable boundary layers.
The use of a simple slab model to predict the mixing height over non-
homogeneous terrain is discussed in relation to the scales of the terrain
heterogeneity. The modifications of the slab model to account for the effect of
abrupt step changes in the surface conditions, i. e. coastal areas, and the
formation of the (internal) boundary layer is considered. The use of Numerical
Weather Prediction model output for mixing height estimation by use of bulk
Richardson numbers is discussed.
Slab models were found to perform well
Keywords
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