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Narrows
A narrows is a restricted land or water passages. Most commonly a narrows is a strait,〔: "a narrow part or passage; specifically a strait connecting two bodies of water —usually used in plural but singular or plural in construction".〕 though it can also be a water gap.
A narrows may form where a stream passes through a tilted bed of hard rock lying between two softer beds: "()f the hard beds are vertical, so that their outcrop does not shift as erosion proceeds, a narrows is developed".〔Heinrich Ries and Thomas L. Watson, ''Engineering Geology'' (1915), p. 278.〕 Like a dam, this "raises the water level for a short distance upriver".〔Richard T. T. Forman, ''Urban Ecology: Science of Cities'' (2014), p. 195.〕 A narrows is also typically a good location for trapping migrating fish.〔Roy L. Carlson, Luke Dalla Bona, ''Early Human Occupation in British Columbia'' (2011), p. 65.〕〔Frank Tough, ''As Their Natural Resources Fail: Native Peoples and the Economic History of Northern Manitoba, 1870-1930'' (2011), p. 156.〕〔Matthew Stein, ''When Technology Fails: A Manual for Self-Reliance'' (2008), p. 158〕 Furthermore, a narrows is "an important topographical feature for wind mixing",〔Howard J. Freeland, David M. Farmer, Colin D. Levings, ''Fjord Oceanography'' (1980), p. 216.〕 an effect where a wind chill may form ice while the surrounding temperature remains above freezing.
== See also ==
* Buffalo Narrows
*The Narrows, which separates Staten Island from Brooklyn and connects the upper and lower sections of New York Bay.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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