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A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW). In non-tidal areas, e.g. the Baltic Sea, mean sea level (MSL) is used. [2]
Intertidal zone biomass reduces the risk of shoreline erosion from high intensity waves. [4] Typical inhabitants of the intertidal rocky shore include sea urchins , sea anemones , barnacles , chitons , crabs , isopods , mussels , starfish , and many marine gastropod molluscs such as limpets and whelks .
During tidal immersion, the food supply to intertidal organisms is subsidized by materials carried in seawater, including photosynthesizing phytoplankton and consumer zooplankton. These plankton are eaten by numerous forms of filter feeders — mussels , clams , barnacles , sea squirts , and polychaete worms—which filter seawater in their ...
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The tide in Lake Michigan is described as 1.3 to 3.8 cm (0.5 to 1.5 in) [79] or 4.4 cm (1 + 3 ⁄ 4 in). [80] This is so small that other larger effects completely mask any tide, and as such these lakes are considered non-tidal.
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A tidal asymmetry is a difference between the duration of the rise and the fall of the tidal water elevation and this can manifest itself as a difference in flood/ebb tidal currents. [19] The tidal asymmetry and the resulting currents are important for the sediment transport and turbidity in estuaries and tidal basins. [ 20 ]
A bore in Morecambe Bay, in the United Kingdom Video of the Arnside Bore, in the United Kingdom The tidal bore in Upper Cook Inlet, in Alaska. A tidal bore, [1] often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travels up a river or narrow bay, reversing the direction of the river or bay's current.