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KMID : 1024519990080060653
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Journal of the Environmental Sciences
1999 Volume.8 No. 6 p.653 ~ p.660
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A study on the Responsibility of the Atmospheric Numerical Model on Turbulence induced by Orography
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Lee Soon-Hwan
Lee Hwa-Woon
Kim Yoo-Keun
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Abstract
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The flow of non-rotation atmosphere with uniform stratification and wind past an isolated three dimensional topography obstacle is investigated with three-dimensional hydrostatic and non- hydrostatic numerical model. The characteristic of turbulence created the back of topography obstacle is usually defined by Froude number which is the function of upstream wind speed, the height of topography obstacle, and atmospheric stability. Turbulence tends to be formed more easily at the non-hydrostatic model than hydrostatic model. Especially, the difference between flow patterns of two models generated by isolated obstacle is more clear under low Froude number. The difference of flow patterns can be only seen at relatively low altitude, but at high altitude the patterns of two models are almost same. In this research, wind velocity in the parameters related with Froude number have great sensitivity at responsibility of numerical models. and slop of obstacle is also important factor at the flow pattern regardless of the species of numerical model
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KEYWORD
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