A halocline is a layer in a body of water where salinity changes rapidly with depth. Oceanographers recognize it by measuring a much larger salt difference over a short vertical distance than in the water above or below. The change may occur across several meters or span a much thicker band, depending on the place…
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A rogue wave is an unusually large, steep wave that appears among much smaller surrounding waves. Oceanographers commonly use a threshold of more than twice the significant wave height, the average height of the highest one-third of waves in a measured record. The definition makes rogue waves relative to the sea state rather than dependent…
Deep-water and shallow-water waves are classified by comparing water depth with wavelength, not by judging whether the sea looks deep or shallow. A wave behaves as a deep-water wave when depth is greater than half its wavelength. It behaves as a shallow-water wave when depth is less than one-twentieth of its wavelength. Between those limits…
Ocean waves break when they enter water shallow enough for the seabed to interfere with their motion. The lower part of the wave slows first. Its wavelength then shortens as the crest grows steeper. Once the crest moves faster than the water beneath can support it, the top pitches forward and releases the wave’s energy…
