Movatterモバイル変換


[0]ホーム

URL:


Jump to content
WikipediaThe Free Encyclopedia
Search

Reach (geography)

From Wikipedia, the free encyclopedia
Straight stretch of water
Globe icon.
The examples and perspective in this articledeal primarily with the United States and do not represent aworldwide view of the subject. The specific issue is:only in the US would you define a reach between arbitrary features; normally they are set by the physics of sail You mayimprove this article, discuss the issue on thetalk page, orcreate a new article, as appropriate.(December 2019) (Learn how and when to remove this message)

Areach is a segment of a stream, river, orarm of the sea,[citation needed] usually suggesting a straight, level, uninterrupted stretch.[1][2]They are traditionally defined by thecapabilities of sailing boats, as a stretch of a watercourse which, because it is straightish, can be sailed in one "reach" (that is, withouttacking).

Reaches are often named by those using the river, and a reach may be named for landmarks, natural features, and historical reasons (see, for instance,Gallions Reach, named after the family that once owned its banks).

A reach may be an expanse, or widening, of a stream or river channel. This commonly occurs after the river or stream is dammed. A reach is similar to anarm, though an arm may bend and thus have multiple reaches. The term "reach" can also refer to a level stretch, as between river rapids or locks in acanal.[citation needed] The word may also be used more generally to refer to any extended portion or stretch of land or water, or even metaphorically.

Influvialhydrology, a reach is a convenient subdivision of study; it may be any length of river of fairly uniform characteristics, or the length betweengauging stations, or simply the length of a watercourse between any two defined points.[3][4] These may be measured in terms ofriver miles.

As of 2015, theUS Board on Geographic Names records 334 place names in the US with the characterization of a named "reach".[5]

Gallery

[edit]
  • Example: Hanford Reach National Monument, Washington State, US. The last significant free-running (undammed) section of the Columbia River in the US
    Example:Hanford Reach National Monument, Washington State, US. The last significant free-running (undammed) section of the Columbia River in the US
  • A map of the reaches of the River Thames; it can be seen that a reach is a straightish stretch (and can therefore be sailed in one reach, one straight-line path between tacks, unless the wind is too close to head-on to allow the sailing-boat to reach)
    A map of the reaches of the River Thames; it can be seen that a reach is a straightish stretch (and can therefore be sailed in onereach, one straight-line path betweentacks, unless the wind is too close to head-on to allow the sailing-boat toreach)
  • Thames barges reaching on the Thames during a race; they are probably on Gravesend Reach
    Thames barges reaching on the Thames during a race; they are probably onGravesend Reach

See also

[edit]
Look upreach in Wiktionary, the free dictionary.

References

[edit]
  1. ^Macfarlane, Robert, "Landmarks", Hamish Hamilton Press, 2015
  2. ^Oxford English dictionary,reach, n., third meaning ("part of a river which can be looked upon at once between two bends")
  3. ^Hydrologic Definitions, Science in Your Watershed,USGS
  4. ^"Glossary: stream-related terms".Streamnet. 7 December 2014. Archived fromthe original on 2014-12-07.
  5. ^USGS Survey GNIS Database
Retrieved from "https://en.wikipedia.org/w/index.php?title=Reach_(geography)&oldid=1322380091"
Categories:
Hidden categories:

[8]ページ先頭

©2009-2025 Movatter.jp