提个问题，让大家在新年里脑子别闲着。

通流

大家都知道这张卫星照片。这岛大概高出海面1百米左右。而云层则至少有5百米。在那个高处，怎么还能形成涡街呢？

[ 本帖最后由 通流 于 2010-1-1 00:48 编辑 ]

lupp

上帝说，在某岛上空形成涡街，于是涡街形成了，上帝看这是好的，于是我们就能把这个图拍下来，大家欣赏了。

哈哈

monday

这个是云层的涡街？我还以为是海水的涡街呢

通流

This Landsat 7 image of clouds off the Chilean coast near the Juan Fernandez Islands (also known as the Robinson Crusoe Islands) on September 15, 1999, shows a unique pattern called a "von Kármán vortex street." This pattern has long been studied in the laboratory, where the vortices are created by oil flowing past a cylindrical obstacle, making a string of vortices only several tens of centimeters long. Study of this classic "flow past a circular cylinder" has been very important in the understanding of laminar and turbulent fluid flow that controls a wide variety of phenomena, from the lift under an aircraft wing to Earth's weather.

通流

我查了NASA的对于此图的说明。其实这个岛的最高峰有一千多米。云层的高度不清楚。从照片上看，照片上的山峰的高度不清楚，但云层的高度似乎比岛高一些。

飞翔鸟

你这一张图又不是第一张图，难道这一张云层比小岛高，第一张的云层也比小岛高吗？

shirazbj

"wiki的说明"那一段好像什么都没说。

到是在这里找到了一段http://weathervortex.com/wakes.htm