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Sandals, a science webcomic

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Valley Girl by Dave Horlick  Sat, 25 Mar 2006 20:45:40 GMT

Bridget: Watch your step, the banks are steep. | Meg: It's a giant semi-circle!Bridget: I wonder how fast the river flows.Bridget has picked up a handful of leaves. | Bridget: Let's toss some leaves in and see.Bridget: ...Now! | The leaves settle onto the stream.The leaves assume a V-like formation. | Bridget: The leaves near the center of the stream are moving faster!Meg: Maybe the banks slow down the water they touch? | Bridget has sketched out a cross-sectional stream flow profile on a portable dry erase board.Bridget: You know, semi-circles have the smallest perimeter of any possible channel shape. | Meg: Which would maximize the stream flow. Nice!Zeke: So does the channel flow swiftly because of its shape, or was the channel shaped by its flow?Zeke: Can we flood a golf course to find out?

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Copyright 2006, Dave Horlick