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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Journal of the Korean Meteorological Society Vol.42 No.1
발행연도
2006.2
수록면
1 - 10 (10page)

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In this study, a three-dimensional (3D) linear mountain wave model is used to investigate the flow of a vertically unbounded, incompressible and stably-stratified Boussinesq fluid over simple and complex terrain. The linear model considers only mechanical disturbances and the solutions are obtained by a two-dimensional (2D) Fast Fourier Transform (FFT) method. The 3D linear model showed reasonably well-known classical structures of wave disturbances over ideal mountains. From the control tests for simple topography, the typical characteristics of linear mountain waves were obtained: For 2D sinusoidal ridges, the linear model showed waves are propagatible when the ridges are widely spaced and evanescent when the ridges are closely spaced. The well-known parabola-shaped vortex is also generated at 1 km height for a 3D isolated bell-shaped mountain. The linear model was applied to Geojae island of South Korea as a linear approach on the density-stratified flow over complex terrain. The intensity, structure and patterns of mountain wave disturbances over the real terrain are estimated in the horizontal plane for a case of 0600UTC 9 November 1998. It is shown that density-stratified flows over complex terrain can be approached using a 3D linear mountain wave model. Although the analytical model treats only mechanical instability with the vertical structure assumed that the incoming wind and buoyancy frequency are constant with height, it showed its usefulness and capability to simulate the influence of a complex terrain to an approaching density-stratified fluids. With further studies for the wind field and vertical momentum transfer analysis, investigations using a nonlinear numerical model could be carried out on the basis of the analytic solutions obtained and under more realistic atmospheric conditions.

목차

Abstract
1. Introduction
2. A three-dimensional linear mountain wave model
3. Application to complex terrain
4. Summary and concluding remarks
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