valley train

Japanese: valley train(英語表記)valleytrain
valley train

…Generally, continental rivers contain little gravel, so the gravel layers are often used as building materials for road construction. The outwash plains formed below mountain valley glaciers are distinguished by the fact that they are long and narrow, filling the valley floor across the entire width of the valley, and are specifically called valley trains. [Michio Nogami]. …

From [Glacial Landforms]

…The meltwater flows are supplied with a large amount of gravelly material, forming a braided channel and a wide floodplain. Those formed in mountain basins are called valley trains, and those formed on wide plains are called outwash plains (called sanders in Iceland). In the case of continental and piedmont glaciers, several meltwater flows can exit from a single glacial tongue, forming an outwash plain that merges into a fan-like alluvial fan. …

*Some of the terminology that mentions "valley train" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…一般的にいって大陸の河川には礫が少ないので,この砂礫層は建築や道路建設の材料として利用されることが多い。山地の谷氷河の下方に形成されたアウトウォッシュ・プレーンは,谷幅いっぱいに谷底を埋めて細長く連なる点で区別され,とくにバレー・トレインvalley trainと呼ばれる。【野上 道男】。…

【氷河地形】より

…融氷水流には礫の多い物質が大量に供給されるため,流路は網状となり広い氾濫原が形成される。山間盆地内に形成されたものはバレー・トレーンvalley train,広い平野部に形成されたものはアウトウォッシュ・プレーン(アイスランドでサンダーsander)と呼ばれる。大陸氷河や山麓氷河の場合には一つの氷舌にいくつかの融氷水流の出口があり,合流扇状地状のアウトウォッシュ・プレーンが形成される。…

※「valley train」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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