instability – Adventures in Oceanography and Teaching

Vortex street

mglessmer — Fri, 06 Mar 2015 11:35:50 +0000

Do you use a tide chart to find the best time for your Saturday walk, too? I showed you a vortex street on a plate formed by pulling a paint brush through sugary water as an example. Now today I want to show you the real thing: Instead of stagnant water and a moving object, I bring to […]

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Confluence of Danube and Morava river

mglessmer — Wed, 04 Mar 2015 12:19:53 +0000

Confluence of Danube and Morava river. Watching the shear flow on Elbe river the other day, I was reminded of another shear flow which I had watched a long time ago. In 2009, J and I went to Bratislava in Slovakia, and from there did a trip to Devín castle. What you see below is […]

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Shear flow

mglessmer — Mon, 02 Mar 2015 12:12:20 +0000

Kelvin-Helmholtz instabilities in a shear flow in Elbe river. Last week I talked about how I wanted to use the “Elbe” model in teaching. Here is another idea for an exercise: On the picture below you see Kelvin-Helmholtz instabilities. They might be kinda hard to make out from the picture, but there is a movie below where […]

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Internal waves in the atmosphere

mglessmer — Mon, 23 Sep 2013 03:36:26 +0000

A photo of internal waves in the atmosphere. Internal waves exist on the interface between fluids of different densities. In the ocean they are mostly observed through their surface imprint. In the tank, we could also observe them by looking in from the side, but this is hardly feasible in the ocean. But luckily vision […]

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