Downslope Windstorms over a 3-dimensional Mountain

[摘要] The effect of 3-dimensionality of a mountain profile on downslope windstorms is analytically investigated. The mountain is immersed in a stably stratified uniform environmental flow. The case of an almost-2-dimensional mountain is considered. The mountain profile has a maximum and is nearly uniform in the cross-stream direction. The downslope wind speed in the along-stream vertical section, in which the mountain profile has its maximum, is calculated. In comparison with the 2-dimensional case in which the profile is strictly uniform in the cross-stream direction, the following results are obtained. When an atmospheric heightis prescribed, both the downslope wind speed and the mountain height, which is required for the douwnslope windstorm to occur, increase due to the 3-dimensional deviation of the profile. On the other hand, when a mountain height is prescribed, both the downslop wind speed and the required atmospheric height decrease due to the deviation.

[学科分类] 大气科学