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 ?
For the purpose of improvement of management mechanisms in the sphere of rational land management in Belgorod region, the idea of CBNU has got its normative consolidation in the Concept of basinal nature use (approved by the resolution of the regional government as of 27.
Animal species inhabiting the forests over these arches may have been partially isolated when the intervening basinal regions were flooded during humid climatic periods of the past.
1989), and Abbots (1989) the Cuber Formation, Puig d'en Pare Formation and Cutri Formation represent a succession of continually deepening carbonate slope to basinal environments where a base-of-slope apron is interpreted to have formed during the Middle Jurassic.
Shu'aiba differs in that it contains referral build-ups of rudists surrounded by dense basinal limestones of the Bab member.
During the Paleogene Pabdeh (basinal marls and argillaceous limestones) Formation were deposited in the middle and on both sides of the Zagros basinal axis [44] (Fig.
Basinal restriction, black shales, Re-Os dating, and the Early Toarcian (Jurassic) oceanic anoxic event.
This approach significantly reduced the possible errors associated with simple assumed basinal generalized functions and thus enhances the representativeness of the porosity-depth and the time-depth functions.
In these cases deposition continued within basinal depressions prior to the onlap of the Windsor Group, with only minor erosion taking place along the basal Windsor Group unconformity.
The stratigraphy consists of deformed and metamorphosed basinal sediments that accumulated at the edge of the Neoproterozoic to Paleozoic continental margin.
The Cedar Hill, Russell Mountain, and Pilot Knob Hematite BIF's apparently were deposited in shallow, restricted basinal settings (caldera lakes?
In the Ventspils borehole section, a 1 m interlayer of nodular limestone of open shelf origin occurs at this level between basinal graptolitic argillite and clayey marlstone of the slope facies (Gailite et al.
There are no intrusions or volcanic rocks nearby; the ore-forming fluid is considered to have been of meteoric or basinal brine origin.