By Professor Dr. Hans-Erich Reineck, Dr. Indra Bir Singh (auth.)
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Additional info for Depositional Sedimentary Environments: With Reference to Terrigenous Clastics
21. Efficiency of the sorting process is strongly controlled by the length of the lee face. Sorting on the lee face of small ripples is rather indistinct, whereas in the case of megaripples and microdeltas, such sorting can be very well developed. Development of Lamination in the Lee Face Avalanching down the lee face is a result of instability created by more intense deposition of grains near the crest of the lee face than near the toe. Mter each avalanche, equilibrium is again established. As will be discussed later, the angle of repose at which avalanching takes place is controlled by several factors.
The lee side can be divided into three major hydrodynamically different zones, as shown in Figs. 20A andB. Fig. 18. Protuberance at the ripple crest and grain path on the upper lee face of a ripple in a flume experiment. (After Reineck 1961) Fig. 19. Flow pattern over ripples in a flume experiment. Heavy-fluid layer and lee side eddies are clearly visible. (After Reineck 1961) 26 Current and Wave Ripples Zone of No Diffusion Zone of Backflow As described by Jopling (1963), this zone may be regarded as a "vestigal" part of the stream flow that carries sediment in suspension over and behind the foreset slope (lee slope).
At about %distance of a stoss side, transport is in the downstream direction only. A heavy-fluid layer is formed. In this layer grains move by sliding, rolling, saltation, and suspension. Sand grains move in an irregular pulsating movement along and up the stoss side. The bigger grains have a larger area exposed to running water, and so are taken away easily. However, the smaller grains are also transported away. Even then a sorting of the sediment takes place: Finer grains settle and percolate down the intergranular pore spaces.
Depositional Sedimentary Environments: With Reference to Terrigenous Clastics by Professor Dr. Hans-Erich Reineck, Dr. Indra Bir Singh (auth.)