Saltation

Japanese: saltation
Saltation

...Materials transported by traction are called suspended matter (mainly in river water), suspended matter, or suspended sediment. Traction is a form in which detrital particles are transported along the bottom surface of a stream, and is a general term for three types of transport: rolling, sliding, and saltation (Figure 1). Materials transported by traction are called traction materials. ...

From [Sand Dunes]

…Silt is difficult to move due to the cohesive forces between particles, but once it does move, it is blown into the sky and carried far away as dust. Therefore, when winds of more than 4 to 5 m/s continue to blow, the sand begins to move along the surface (surface creep), and eventually it starts to jump and move (saltation). In this process, the grain size is selected, and the sand becomes uniformly medium to fine grained. …

*Some of the terminology explanations that mention "saltation" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…浮流によって運搬される物質は浮流物質(おもに河川水中のもの),懸濁物質または浮遊砂などと呼ばれる。掃流tractionは砕屑粒子が流れの中を底面に沿って運搬される形式で,転動rolling,滑動sliding,躍動saltationという3種類の運搬形式を総称したものである(図1)。掃流によって運搬される物質は掃流物質と呼ばれる。…

【砂丘】より

…シルトは粒子間の凝集力などのために動きにくいが,いったん動くと上空に舞い上がり,ダスト(風塵)として遠方へ運ばれる。したがって,4~5m/sをこえる風が吹き続けると,砂は表面に沿って動き始め(表面匍行surface creep),やがて,跳ね飛んで移動(跳躍saltation)するようになる。この過程で粒径の淘汰(とうた)作用が進み,中~細粒砂にそろってゆく。…

※「saltation」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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