图3. 复合流作用下内碎屑沉积示意图^[70]
（a）~（d）底床瞬时剪切应力(近底床流速)与板状内碎屑运动的关系；（a）脉动流示意图，单向流和波动传播方向相反，Uc<0, |Uc|>|Uw|；（b）底床剪切力较小时板状内碎屑的滑动；（c) 底床剪切力较大时板状内碎屑的旋转；（d) 底床剪切力逐渐减小时前期形成的粗糙底床滑动挤压形成直立或大角度倾斜的砾屑堆积；（e）内碎屑层几何形态横向变化野外素描图；Uc：单向流速度；Uw：振荡流速度；T：波动周期；FS：扇形扁立组构；C：杂乱扁立组构

Fig.3. Sketch for deposition of intraclasts under combined-flow^[70]
(a)~(d) Relationship between instantaneous bed shear stress (near bed velocity) and movement of plate-like intraclasts;(a) Sketch for pulsating current, unidirectional current has an opposite direction of wave propagation, Uc<0, |Uc|>|Uw|;(b) Slide of plate-like intraclasts under lower bed shear stress;(c) Rotation of plate-like intraclasts under high bed shear stress;(d) Formation of near vertical or steeply inclined orientations from the sliding extrusion of preceding rough bed as the bed shear stress decreasing;(e)Field sketch of the lateral variation in bedding geometry of intraclast layers; Uc:Unidirectional current velocity; Uw: Oscillatory current velocity; T:Wave period; FS:Fan-Shaped edgewise fabric; C:Chaotic edgewise fabric