Nav 112 - 06 TIDES and Currents, part 1

Nav 112 - 06 TIDES and Currents, part 1 - Tides and...

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Tides and Currents Current TIDE
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Tides are caused by interactions between the ocean,  Sun and Moon. The vertical difference  between high tide and low  tide is the tidal range. Tidal period  is the time  between consecutive high  or low tides  There are three basic types  of daily tides defined by  their period and regularity:  Diurnal tides , Semidiurnal  tides, and Mixed tides. Tidal Characteristics
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TIDAL RANGE
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Diurnal Tide Diurnal Tide - A tidal cycle with one high and one low tide per  lunar day (12 h 50 min). Also known as daily tides, they are  common in the Gulf of Mexico and along parts of the coast of  China.
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Semi-Diurnal Tide Semi-diurnal tide:  Featuring two highs and  two lows each day, with minimal variation in  the height of successive high or low waters.  This type is more likely to occur when the  moon is over the equator. 
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Mixed Tides Mixed tide: Characterized by wide variations in heights  of successive high and low waters, and by longer tidal  cycles than those of the semi-diurnal cycle. These  tides also tend to occur as the moon moves furthest  north or south of the equator. 
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Spring Tides Spring tides  occur when  Earth, Moon and Sun are  aligned in a straight line  and the tidal bulges display  constructive interference,  producing  very high, high  tides and very low, low  tides . Spring tides coincide  with the new and full  moon.
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Neap Tides Neap tides occur  when the  Earth, Moon and Sun are  aligned forming a right angle  and tidal bulges displaying  destructive interference,  producing low high tides and  high low tides.
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