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distributary : ウィキペディア英語版
distributary

A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. They are a common feature of river deltas. The phenomenon is known as river bifurcation. The opposite of a distributary is a tributary. Distributaries usually occur as a stream nears a lake or the ocean, but they can occur inland as well, such as on alluvial fans or when a tributary stream bifurcates as it nears its confluence with a larger stream. In some cases, a minor distributary can divert so much water from the main channel that it can become the main route.
==Related terms==
Common terms to name individual river distributaries in English-speaking countries are ''arm'' and ''channel''. They may refer to a distributary that does not rejoin the channel it has branched from (e.g., the North, Middle, and South Arms of the Fraser River, or the West Channel of the Mackenzie River), or one that does (e.g. Annacis Channel and Annieville Channel of the Fraser River, separated by Annacis Island).
In Australia, the term ''anabranch'' is used to refer to a distributary that diverts from the main course of the river and rejoins it later. In North America an anabranch is called a ''braided stream''.

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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