I’ve recently had my first experience rowing in a canoe and I noticed that when I finish rowing, there is always 1(sometimes more but usually 1) spinning moving hole in the water. it usually gets filled up with water nearby after a few seconds but they sometimes last around half a minute. this phenomena seems to happen when you put an object in a liquid, move it and then scoop it out of the water(tried with soup). is there a reason why that happens? maybe some well known physic stuff.
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Pulling on the oar creates a slightly higher pressure on one side of the oar and a corresponding lower pressure on the opposite side. The higher pressure water must flow around the end of oar to equalize the pressure on the low pressure side. When the oar is lifted this creates a circular flow called a vortex. The lower pressure water at the center is what creates the dip or “hole”.
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