Rippled Ice on the Hay River near Alexandra Falls, NWT (Canada), May 2008
If you’ve been following this blog you may remember that I showed a photo of rippled ice on the Mackenzie River a while back. The underside of the ice cover can develop ripples in the spring, when there is open water upstream that is being heated by the sun and warm air. This is another example that was found on the Hay River in 2008. We don’t see this too often since it is the underside of the ice that develops the ripples, of course. If you look carefully – you’ll notice that this ice floe was standing on its side – I’ve flipped the picture above sideways so it’s easier to see the ripples. Here, to the left, is how it looked when it was found.
(Photo by Chris Krath, UofA River Ice Group – Fuiji Fine Pix A820, f/2.9, ISO-200, FL 9 mm, 1/120 sec. exposure duration)