On Ripples—A Boundary Layer-Theoretical Definition
Once the first initial ripples have developed, they form according to the actual flow forces and sediment properties. In this paper, a semianalytical approach to determine the length of the developed ripples is presented. The theory assumes initial disturbances at the bed surface and corresponding f...
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doaj-aba5eb61c25344bd82f42dcf66e192122021-03-25T00:06:48ZengMDPI AGWater2073-44412021-03-011389289210.3390/w13070892On Ripples—A Boundary Layer-Theoretical DefinitionUlrich Zanke0Aron Roland1Z & P—Prof. Zanke and Partner, Ackerstr. 21, D-30826 Garbsen, Hannover, GermanyBGS-ITE, Pfungstaedter Straße 20, D-64297 Darmstadt, GermanyOnce the first initial ripples have developed, they form according to the actual flow forces and sediment properties. In this paper, a semianalytical approach to determine the length of the developed ripples is presented. The theory assumes initial disturbances at the bed surface and corresponding flow separations resulting from an individual respective boundary layer. What causes the initial rhythmic perturbations is not the subject of this paper. Based on boundary layer theory, this approach explains a possible physical background for the existence and length of developed ripples in cohesion-free sediments. At the same time, the approach provides a distinction from dunes: ripples are sand waves affected by a viscous sublayer, and dunes are sand waves where this is not the case. Applications to Earth, Mars, and Titan are shown.https://www.mdpi.com/2073-4441/13/7/892sediment transportripplesdunesbed formsMarsTitan |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ulrich Zanke Aron Roland |
spellingShingle |
Ulrich Zanke Aron Roland On Ripples—A Boundary Layer-Theoretical Definition Water sediment transport ripples dunes bed forms Mars Titan |
author_facet |
Ulrich Zanke Aron Roland |
author_sort |
Ulrich Zanke |
title |
On Ripples—A Boundary Layer-Theoretical Definition |
title_short |
On Ripples—A Boundary Layer-Theoretical Definition |
title_full |
On Ripples—A Boundary Layer-Theoretical Definition |
title_fullStr |
On Ripples—A Boundary Layer-Theoretical Definition |
title_full_unstemmed |
On Ripples—A Boundary Layer-Theoretical Definition |
title_sort |
on ripples—a boundary layer-theoretical definition |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2021-03-01 |
description |
Once the first initial ripples have developed, they form according to the actual flow forces and sediment properties. In this paper, a semianalytical approach to determine the length of the developed ripples is presented. The theory assumes initial disturbances at the bed surface and corresponding flow separations resulting from an individual respective boundary layer. What causes the initial rhythmic perturbations is not the subject of this paper. Based on boundary layer theory, this approach explains a possible physical background for the existence and length of developed ripples in cohesion-free sediments. At the same time, the approach provides a distinction from dunes: ripples are sand waves affected by a viscous sublayer, and dunes are sand waves where this is not the case. Applications to Earth, Mars, and Titan are shown. |
topic |
sediment transport ripples dunes bed forms Mars Titan |
url |
https://www.mdpi.com/2073-4441/13/7/892 |
work_keys_str_mv |
AT ulrichzanke onripplesaboundarylayertheoreticaldefinition AT aronroland onripplesaboundarylayertheoreticaldefinition |
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