Tide Tide The chart datum is the level of water that charted depths displayed on nautical charts are measured from. ...more on Wikipedia about "Chart datum"
(Geodetic system) :This article describes a concept from surveying and geodesy. Datum is also the singular form of data. For the Austrian magazine, see Datum. ...more on Wikipedia about "Geodetic system"
Lunitidal interval is the length of time from when the moon passes over a meridian and the next high tide at that meridian. Tides are known to be mainly caused by the moon's gravity. Theoretically, high tide happens when the moon is at meridian. However, there is actually a delay that depends on many complicated factors. ...more on Wikipedia about "Lunitidal interval"
Ocean colonization is the theoretical practice of building structures to allow humans to live permanently in areas of Earth covered in water; whether floating on the surface of the ocean, secured to the ocean floor, or somewhere in between. ...more on Wikipedia about "Ocean colonization"
Physical oceanography is the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of the ocean. ...more on Wikipedia about "Physical oceanography"
The pororoca is a tidal bore up to 4 meters high that travels upstream the Amazon River. Its name comes from the indigenous Tupi language, where it translates into "great destructive noise". It occurs at the mouth of the river where river water meets the Atlantic Ocean. The phenomenon is best seen in February and March, where waves up to 4 meters rolling for up to 35 minutes have been observed. ...more on Wikipedia about "Pororoca"
A rip current is a strong flow of water returning seaward from the shore. It is often mistakenly called a "rip tide" or "riptide", though the occurrence is not related to the tides. Colloquially a rip current is known simply as a rip. Although rip currents would exist even without the tides, they can make an existing rip much more dangerous (especially low tide). Typical flow is at 0.5 metres per second (1-2 feet per second), and can be as fast as 2.5 metres per second (8 feet per second). Rip currents can move to different locations on a beach break, up to a few hundred feet a day. They can occur at any beach with breaking waves, including the world's oceans, seas, and large lakes such as the Great Lakes in the United States and Canada. ...more on Wikipedia about "Rip current" http://www.shortopedia.com - Xtending Info.
The Rule of Twelfths is a rule of thumb for estimating the height of the tide at any time, given only the time and height of high and low water. This is important when navigating a boat or a ship in shallow water and when launching and retrieving boats on slipways on a tidal shore. ...more on Wikipedia about "Rule of twelfths"
In navigation set and drift are characteristics of the current in which a ship is sailing. Drift is the magnitude of the current (typically measured in knots) and set is the bearing in the direction the current is flowing. Bearing is measured in degrees clockwise from either magnetic or true (geographical) North. ...more on Wikipedia about "Set and drift"
Slack water is the time during which no appreciable tidal current is flowing in a body of water. ...more on Wikipedia about "Slack water"
A storm tide is a tide with a high flood period caused by a storm. Storm tides can be a severe danger to the coast and the people living along the coast. The water level can rise to more than 5 m (17 ft) above the normal tide. Compare to storm surge. ...more on Wikipedia about "Storm tide"
A tidal atlas is used to predict the direction and speed of tidal currents. ...more on Wikipedia about "Tidal atlas"
A tidal bore (or just bore, or eagre) is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travel up a river or narrow bay against the direction of the current. As such, it is a true tidal wave (not to be confused with a tsunami). ...more on Wikipedia about "Tidal bore"
Tidal Diamonds are symbols on British Admiralty Charts that indicate the direction and speed of tidal streams. ...more on Wikipedia about "Tidal diamonds"
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The tidal force is a secondary effect of the force of gravity and is responsible for the tides. It arises because the gravitational field is not constant across a body's diameter. When a body is acted on by the gravity of another body, the field can vary significantly between the near side and the far side. This causes strains on the body, and may distort it or break it apart. These strains do not occur if the gravitational field is uniform, since a uniform field only causes the entire body to accelerate together, in the same direction and at the same rate. ...more on Wikipedia about "Tidal force"
A tidal island is a piece of land that is connected to the mainland by a natural or man-made causeway that is exposed at low tide and submerged at high tide. Because of the mystique surrounding tidal islands the majority of them have been sites of religious worship, such as Mont Saint Michel with its Benedictine Abbey. Tidal islands are also commonly the sites of fortresses, due to their natural fortifications. ...more on Wikipedia about "Tidal island"
Tidal power is a means of electricity generation achieved by capturing the energy contained in moving water mass due to tides. Two types of tidal energy can be extracted: kinetic energy of currents arising between ebbing and surging tides and potential energy from the difference in height (or head) between high and low tides. The former method - generating energy from tidal currents - is considered much more feasible today than building ocean-based dams or barrages, and many coastal sites worldwide are being examined for their suitability to produce tidal (current) energy. ...more on Wikipedia about "Tidal power"
Tidal race (tidal rapid) is a natural occurrence whereby a fast moving tide passes through constriction resulting in the formation of waves, eddies and hazardous currents. The contraction can be a passage where the sides narrow, for example the Gulf of Corryvreckan, or an underwater obsruction such as a reef or rising seabed, such as the Portland Race. ...more on Wikipedia about "Tidal race"
In oceanography, tidal resonance occurs when the time it takes for a large wave to travel from the mouth of the bay to the opposite end, then reflect and travel back to the mouth of the bay, coincidentally matches the time from one high tide to the next. This phenomenon is perhaps best exemplified in the Bay of Fundy. The result of this coincidence of timing is that the repeating wave is reinforced by the tidal rhythm, and consequently the world's highest tides are found in that bay. ...more on Wikipedia about "Tidal resonance"
The tide is the regular rising and falling of the ocean's surface caused by changes in gravitational forces external to the Earth. The main changing gravitational field is due to the Moon while a lesser field is caused by the Sun. ...more on Wikipedia about "Tide"
Tide pools (also tidal pools or rock pools) are rocky pools by the ocean that are filled with seawater. Tide pools can either be small and shallow or large and deep. The small ones are usually found far back on the shore and the large ones are found nearer to the ocean. Tide pools are formed as a high tide comes in over a rocky shore. Water fills depressions in the ground, which turn into isolated pools as the tide retreats. This process, repeated twice a day, replenishes the seawater in what otherwise might be a stagnant pool. ...more on Wikipedia about "Tide pool"
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A tide table is used for tidal prediction and shows the daily times and height of high water and low water for a particular location. Tide heights at intermediate times (between high and low water) can be approximately calculated using the rule of twelfths or more accurately by using a published tidal curve for the port. ...more on Wikipedia about "Tide table"
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