Secondary flow caused by differential roughness,Langmuir circulations,and their effect on the development of sand ribbons |
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| Authors: | H M Pantin D Hamilton C D R Evans |
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| Institution: | (1) Institute of Geological Sciences, Ring Road Halton, LS15 8TQ Leeds, England;(2) Department of Geology, University Walk, Queen's Building, BS8 1TR Bristol, England |
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| Abstract: | The process of Differential Roughness Secondary Flow (DRSF), hitherto little recognized, recently was demonstrated in a wind
tunnel and in a flume. It is suggested here the DRSF may, in the natural environment, play an important part in the persistence
and sharp definition of sand ribbons, previously initiated by other processes.
In 1980 Karl described a series of sand ribbons, alternating with exposed substrate, which he attributed to the effect of
Langmuir circulations. Although Langmuir Circulation Secondary Flow (LCSF) may indeed, in some cases, initiate sand ribbons,
the sharply-defined edges typical of these features are explained better by DRSF. |
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