basin


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basin

1. any partially enclosed or sheltered area where vessels may be moored or docked
2. the catchment area of a particular river and its tributaries or of a lake or sea
3. a depression in the earth's surface
4. Geology a part of the earth's surface consisting of rock strata that slope down to a common centre

basin

A huge crater. Lunar basins are multiringed structures that are several hundred kilometers in diameter and were all produced during the first 750 million years of lunar history by intense meteoritic impact. The youngest basins (Orientale, Imbrium, Crisium, Nectaris, and Serenitatis) may have been excavated during a cataclysmic period around 3900 million years ago. The ejecta blankets of basins are extensive and provide the basis for highland stratigraphy. Basins are so defined by their systems of concentric ring structures, most of which are now in the form of ridges and mountain arcs. Basins on the Moon's nearside were filled with lava at some time up to 3000 million years ago to produce maria: the resulting mare has the same name as the basin (e.g. Mare Imbrium). Several unfilled basins (thassaloids) exist on the farside, the largest of which was revealed as a vast depression by the Apollo 15 laser altimeter. At least 28 basins are now known to exist. See also rille; mascons.

Basin

 

the accumulation of water flows with no drainage or with slow drainage in natural or artificial depressions in the earth’s surface. Basins are formed when there are en-closed hollows on the surface and when the water flowing into them exceeds the water lost by evaporation and seepage into the soil. Basins can be permanent or temporary, arising only during periods of the year which abound in water. Basins are classified as freshwater or saltwater, depending upon their chemical composition and the amount of salts dissolved in the water. The physical, chemical, and bio-logical processes in basins progress in various ways, depending upon the type of basin. Reservoirs, ponds, and canals are artificial basins.


Basin

 

negative (hollow) form of relief of the earth’s surface with more or less isometric or slightly elongated outlines. A basin may be closed on all sides or open in one or two directions. On the basis of morphology flat-bottom, bowl-shaped, and other basins are distinguished; by origin basins are divided into tectonic, volcanic (for example, calderas), erosion, glacial (for example, moraine-dammed basins), deflation, and karst. By drainage conditions they are divided into basins through which water flows, basins with outlets, and basins without outlets (in arid regions).

In the geomorphology of the sea floor a distinction is made between basins in the transition zone, which are occupied by geosynclinal seas, and oceanic basins, which are the largest negative forms of relief on the ocean floor.

basin

[′bās·ən]
(civil engineering)
A dock employing floodgates to keep water level constant during tidal variations.
A harbor for small craft.
(design engineering)
An open-top vessel with relatively low sloping sides for holding liquids.
(geology)
A low-lying area, wholly or largely surrounded by higher land, that varies from a small, nearly enclosed valley to an extensive, mountain-rimmed depression.
An entire area drained by a given stream and its tributaries.
An area in which the rock strata are inclined downward from all sides toward the center.
An area in which sediments accumulate.
(metallurgy)
The mouth of a sprue in a gating system of castings into which the molten metal is first poured.
(oceanography)
Deep portion of sea surrounded by shallower regions.

basin

1. A somewhat shallow vessel for holding water (or the like).
2. A shallow tank or natural or artificial depression containing water.
References in periodicals archive ?
At the overlook, the view takes in the geyser basin, the inn - and, if your timing is right, an eye-level view of the top of Old Faithful's gusher.
Drilling at the Tyrrhenian's two deep basins also indicated that the locus of seafloor spreading apparently jumped from the Vavilov Basin, about halfway down the coast of Italy, into the Marsili Basin to th southeast.
To find out more about Wits Basin Precious Minerals Inc.
Most of the sto the city's jurisdiction are about that size - the largest is the debris retention basin off Magic Mountain Parkway.
In the San Juan Basin, for example, sediments were deposited after the Rocky Mountains were created in the collision of an oceanic plate with North America, an event called the Laramide orogeny.
The Longtom 3 appraisal well in VIC/P54 has confirmed the potential for gas charged sands in the Admiral Formation along the northern margin of the Gippsland Basin to flow gas at commercial rates and has opened up a new exploration play in this area.
Joining dozens of bird watchers across the San Fernando Valley, and an estimated 50,000 worldwide, the 51-year-old Ohlenkamp led a small group through the wildlife basin for the Audubon Society's annual Christmas Bird Count.
The researchers were studying the geochemical, sedimentological and tectonic processes of the basin.
After reviewing multiple options, we chose Basin Water because they were the most responsive bidder and offered a guaranteed process with single-source responsibility," said City Manager Brian Mickelsen.
Delayed for a year by legal wrangling, city officials plan to finish work on the basin at Heathrow Drive and Town Center Drive as soon as approval is received from the state's Lahonton Regional Water Quality Board.
6 billion cubic feet per day (Bcf/d), extends from a connection with EnCana's 32-mile, 24-inch diameter Great Divide Gathering System near Parachute, Colorado, northward through the heart of the Piceance Basin to Enterprise's 1.
A resident from the Valley trying to get to the basin side to visit any of these sites has to either join the slow-motion bumper cars over the Cahuenga Pass or the traffic molasses that is the San Diego Freeway, or squeeze out the east end of the Valley and weave between the tractor-trailers on the Golden State.