2D Airflow over a Double Bell-Shaped Mountain |
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| Authors: | G J Mayr A Gohm |
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| Institution: | (1) Department of Meteorology and Geophysics, University of Innsbruck, Austria, AT |
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| Abstract: | Summary. ?The airflow over an idealized orography with two mountain peaks and a valley between is investigated using a non-linear numerical
model. The flow is assumed to be two-dimensional and nonrotational. Surface friction is neglected. This setup is a first step
in studying the modifications a finely structured “real” topography introduces to the well-studied flow over one isolated
obstacle. The sensitivity of the flow behavior to the valley width is examined for the case of specified mountain volume as
well as constant non-dimensional mountain height. Flow patterns for linear, weakly nonlinear, wave breaking and upstream blocking
cases are examined. Whereas the nondimensional mountain height is still the main measure of the nonlinearity of the flow,
the differing steepness of upslope and downslope caused by the separating valley, strengthens nonlinear effects. It also modifies
wave breaking and upstream blocking. For wide enough valleys wave breaking regions can form above both peaks.
Received January 20, 1999/Revised June 28, 1999 |
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