ship’s wake – Adventures in Oceanography and Teaching

One of the most difficult #friendlywaves I’ve ever gotten! Did I get it right?

mglessmer — Tue, 25 Aug 2020 13:58:21 +0000

Florian sent me a #friendlywave — a wave picture he took, with hopes that I might be able to explain what is going on there. And this one had me puzzled for some time! This is what the picture looks like: What I knew about it: Florian was on the ferry from Wisschafen to Glückstadt, crossing the […]

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A #friendlywaves from Lofoten

mglessmer — Mon, 11 May 2020 12:05:00 +0000

A #friendlywaves post: you send me the pictures, I talk about physics! Today: My friend A sent me these lovely pictures from Lofoten, knowing I love wave watching. And there is so much to see! Let’s begin with the picture above, where we are looking out over the stern of a ship towards a bridge. There […]

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Concave sea wall focuses waves into interesting pattern

mglessmer — Sun, 25 Aug 2019 06:24:11 +0000

Early morning Kiel fjord — today even featuring a hot-air balloon! But, more interestingly, the wake of this police boat. I find it already pretty cool in the picture below: The fjord is calm and mirror-like, but inside the ship’s V-shaped wake the surface changes completely and the reflections look totally different (now only reflecting […]

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Observing the shape of shallow water waves on a beach

mglessmer — Sun, 18 Aug 2019 15:42:42 +0000

When I go wave watching back home in Kiel, I tend to be drawn to other places than this particular one, but sometimes you find gold in the places you least expect it. And then, what is usually a really nice and easy to explain kind of wave — shallow water waves — acts up […]

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Walk to & visit at GEOMAR as wave watching occasion

mglessmer — Mon, 05 Aug 2019 13:05:10 +0000

These very long and regular wave crests were caused by a ship — they are one side of the V of a ship’s wake that’s about to reach the sea wall here. I love how well defined the wave crests are — on one side you see the reflection of the bollards and the bright […]

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Wake watching at Ratzeburger Segelschule

mglessmer — Fri, 02 Aug 2019 13:05:36 +0000

The waves that ducks (or ships, or anything else moving through water) make are called “wakes”. And wake watching is so much fun! A wake is pretty much the Mach cone in 2D — waves from the duck can’t propagate faster than the leading edge of the wake. When a wake passes by, that’s the […]

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A #friendlywaves from Tampa, Florida

mglessmer — Sat, 13 Jul 2019 17:37:23 +0000

Anyone who might be new to my blog because of yesterday’s presentation at #SiPManc — please don’t be scared and run away, this is the most complicated #friendlywaves I have ever gotten, usually things are A LOT easier! :-) I love #friendlywaves! Victor sent me the picture above. He took it in 2017 in Tampa, […]

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Nena sent me some #friendlywaves from Lago Maggiore

mglessmer — Wed, 12 Jun 2019 04:15:21 +0000

This is a #friendlywaves challenge, where I try to explain other people’s wave photos and they tell me how I did. I love it when my friends see waves, think of me, whip out their cameras, take pictures, and send them to me! In this case, Nena even used a telephoto lens and took the […]

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