File:Rapids_before_the_Rhine_Falls.jpg · Wikimedia Commons · See Wikimedia Commons
Also known as rapid
thumb|Rapids of Kern River, [[California, USA.]] Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence. Flow, gradient, constriction, and obstacles are four factors that are needed for a rapid to be created.
Rapids are sections of a river where the riverbed slopes steeply, which causes the water to flow faster and become turbulent. They form when certain conditions exist together—including water flow, a steep gradient, a narrowing of the river channel, and obstacles in the water—making rapids important features that significantly affect how rivers behave.
AI-generated from the Wikipedia summary — may contain errors.
Wikidata facts
- Subclass of
- watercourse
- Image
- Порог "Інтеграл" на р.Південний Буг біля с.Мигія.jpg
Show 6 more facts
- Commons category
- Rapids
- topic's main category
- Category:Rapids
- different from
- canyon
- associated hazard
- drowning
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
- exact match
- purl.obolibrary.org/obo/ENVO_00000034
Sources (6)
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Article · 中文
急流是河流中較陡峭的部份，可以分為1-8，1是最適合航行的，而8是河床坡度最陡的，會讓水的速度增加，造成湍流。 急流是水文学的現象，介於平順流動的河流及瀑布之間。急流的特點是河會越來越深，而且在會有些岩石露出水面。當水沖刷石頭及沿石頭旁邊流過時，空氣泡會混合到水中，因此水的表面會呈現白色的水花，稱為whitewater。急流一般是在上游河床的材質比下游要堅固所造成，急流會讓河流進行，因此其水質會比較好。 有針對急流進行分類，一般會分為第1至4級。第5級的急流可以分類為5.1-5.9級。第1級的急流很容易渡過，不需要其他工具。而第4級的急流會對生命造成威脅，若無救生設備，落水後幾乎不可能獲救。泛舟一般會選擇有許多急流的河段。
Abstract from DBpedia / Wikipedia · CC BY-SA