WaveDepth: Water Depth

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Find depth of sea from waves

WaveDepth estimates how deep the water is by watching what waves do as they cross it. In deep water a wave barely feels the bottom. As the seabed rises the wave slows, its crests bunch together, and it grows taller — wave shoaling. How much taller depends only on the depth and the wave period, so measuring that change at several points along the wave's path recovers the depth at each one. All you need is one brightly coloured floating ball and a steady place to rest your phone. HOW A MEASUREMENT WORKS 1. Register your ball. Circle it once in a photo and enter its real diameter. That single nu…

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