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A narrow break in a sea floor rise or between two abyssal plains.

Related Terms

CAMBER

The rise of a deck, athwartship

HEAVE

The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING

FILTER LIFE TEST

A type of filter capacity test in which a clogging contaminant is added to the influent of a filter, under specified test conditions, to produce a given rise in pressure drop across the filter or until a specified reduction of flow is reached. Filter life may be expressed as test time required to reach terminal conditions at a specified contaminant addition rate.

CAPILLARITY

A property of a solid-liquid system manifested by the tendency of the liquid in contact with the solid to rise above or fall below the level of the surrounding liquid; this phenomenon is seen in a small bore (capillary) tube.

HEIGHT OF TIDE

Vertical distance from the chart sounding datum to the water surface at any stage of the tide. It is positive if the water level is higher than the chart sounding datum. The vertical distance from the chart sounding datum to a high water datum is called RISE OF TIDE.

RAMP RATE

Ramp rate is used in bringing a turbine up to operating temperature and is the degrees Celsius rise per hour that metal surfaces are exposed to when bringing a machine to rated conditions. Manufacturers specify ramp rates or their machines in order to avoid thermal stresses. Thermocouples are used in measuring metal temperatures.

TIDE

The periodic rise and fall of water level in the oceans.

DEADRISE

The design angle of the hull at the keel relative to horizontal when viewing the cross section, or the distance of rise from the keel to a defined point on the hull.

AUTOMATIC TIDE GAGE

An instrument that automatically registers the rise and fall of the tide. In some instruments, the registration is accomplished by recording the heights at regular intervals in digital format, in others by a continuous graph in which the height versus corresponding time is recorded.

NODAL LINE

A line in an oscillating body of water along which there is a minimum or no rise and fall of the tide.
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