transparency
326
transparency ~Secchi disk.
trapped wave due to a spatial variation of the phase velocity the large-scale propagation of free waves can be limited by refraction to a narrow range of directions
called a wave guide. A sound channel (~acoustics) can act as a wave guide for
acoustic waves. Similar effects can occur for gravity waves, such as edge waves,
double Kelvin waves and bottom-trapped waves, trapped by the depth-dependent variation of the phase speed. These waves are also called topographic waves.
Internal waves can become trapped near the thermocline, due to the. depthdependent variation of the Brunt-Viiisiilii frequency. Equatorial waves are trapped
because of the change of sign of the Coriolis force at the equator.
Travailleur and Talisman Expeditions (1880-1883) these French expeditions under
scientific guidance of Alphonse Milne-Edwards studied the Mediterranean
Sea and the East Atlantic.
traveling wave ~progressive wave.
trawl net towed by a motor vessel through the water (pelagic trawl) or over the
seabed (bottom trawl), consisting of a conical bag of heavy netting and a construction to keep the net entrance (or mouth) open. Pelagic trawls are mounted with "doors" (rectangular boards that, when pulled through the water are
driven apart to keep the entrance open); bottom trawls are kept open either by
weighted doors that run over the seabed (otter trawl) or by a horizontal beam
with sledges on both ends (beam trawl). The catch collects in the rear (cod end)
of the trawl, which can be opened from behind when on deck after a haul.
trench (syn. trough) relatively narrow, elongate depression of the deep-sea floor,
with steep sides and oriented parallel to the trend of the continental edge. A
trench is about 2 km deeper than the surrounding sea floor and may be
thousands of kilometers long. In plate tectonics context, often a discontinuity
of the lithosphere where one plate plunges beneath another. Commonly associated with a volcanic arc or island arc in the overriding plate displaced from
the trench. ~sea-floor topography.
Triassic ~geological time scale.
Trilobita (trilobites) subphylum of the phylum Arthropoda. Extinct, exclusively
Paleozoic marine bottom dwellers. More than 1500 genera have been described.
Probably related to ancestors of Crustacea.
triple junction in plate tectonics, a point or area where three plates meet.
326
transparency ~Secchi disk.
trapped wave due to a spatial variation of the phase velocity the large-scale propagation of free waves can be limited by refraction to a narrow range of directions
called a wave guide. A sound channel (~acoustics) can act as a wave guide for
acoustic waves. Similar effects can occur for gravity waves, such as edge waves,
double Kelvin waves and bottom-trapped waves, trapped by the depth-dependent variation of the phase speed. These waves are also called topographic waves.
Internal waves can become trapped near the thermocline, due to the. depthdependent variation of the Brunt-Viiisiilii frequency. Equatorial waves are trapped
because of the change of sign of the Coriolis force at the equator.
Travailleur and Talisman Expeditions (1880-1883) these French expeditions under
scientific guidance of Alphonse Milne-Edwards studied the Mediterranean
Sea and the East Atlantic.
traveling wave ~progressive wave.
trawl net towed by a motor vessel through the water (pelagic trawl) or over the
seabed (bottom trawl), consisting of a conical bag of heavy netting and a construction to keep the net entrance (or mouth) open. Pelagic trawls are mounted with "doors" (rectangular boards that, when pulled through the water are
driven apart to keep the entrance open); bottom trawls are kept open either by
weighted doors that run over the seabed (otter trawl) or by a horizontal beam
with sledges on both ends (beam trawl). The catch collects in the rear (cod end)
of the trawl, which can be opened from behind when on deck after a haul.
trench (syn. trough) relatively narrow, elongate depression of the deep-sea floor,
with steep sides and oriented parallel to the trend of the continental edge. A
trench is about 2 km deeper than the surrounding sea floor and may be
thousands of kilometers long. In plate tectonics context, often a discontinuity
of the lithosphere where one plate plunges beneath another. Commonly associated with a volcanic arc or island arc in the overriding plate displaced from
the trench. ~sea-floor topography.
Triassic ~geological time scale.
Trilobita (trilobites) subphylum of the phylum Arthropoda. Extinct, exclusively
Paleozoic marine bottom dwellers. More than 1500 genera have been described.
Probably related to ancestors of Crustacea.
triple junction in plate tectonics, a point or area where three plates meet.