surface creep

Japanese: surface creep(英語表記)surfacecreep
surface creep

…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 terminology explanations that mention "surface creep" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…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。…

※「surface creep」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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