波痕

波痕（）是由於流體（水或风）的流動在沉积物表面形成的波状起伏的構造。一般由沉积物表层的砂粒在迁移过程中形成在层面上的沙波。 波痕有三種：流水波痕（Current formed  ripples）：呈不对称状，波谷与波峰均较圆滑，陡坡倾向与流向一致Boggs Jr., Sam. (2006) Principles of Sedimentology and Stratigraphy, 4th ed Easterbrook, Don J. Surface processes and landforms. Upper Saddle River, N.J: Prentice Hall, 1999. Print. ISBN 0-13-860958-6 pp. 479-480。浪成波痕（wave-formed ripples）：对称的浪或波痕，波峰尖、波谷圆滑Nichols, Gary. (2009) Sedimentology and Stratigraphy, Wiley, ISBN 978-1405135924。风成波痕（Wind-formed ripples）：呈不对称状，波谷宽阔，波峰圆滑，陡坡倾向与风向一致 Greeley, Ronald, and James D. Iversen. Wind as a Geological Process On Earth, Mars, Venus and Titan (Cambridge Planetary Science Old). New York: Cambridge UP, 1987. ISBN 0-521-35962-7 pp. 153-154。

参考文献

外部链接

 Ripple Marks and Uniformitarianism 
 Unidirectional flow: Sand ripples and grain distribution 2D model 
 Unidirectional flow: Sand ripples and topography 2D model 
 Waves: Sand ripples and grain distribution 2D model 
 Waves: Sand ripples and topography 2D model 

Category:流体传动
Category:沉积学