The effect of hydrodynamic forces due to combined action of surface waves and current on the riverbank is critical to understand sediment entrainment, transport and bank line retreatment process. In understanding the temporal effect of turbulent structures under induced wave-current flow, a series of laboratory experiments were carried out. Micro-Acoustic Doppler Velocimeter (ADV) and Ultrasonic Ranging System (URS) were used simultaneously for the measurement of velocity fluctuations and bank undercut depth increment. Modulation of the turbulent flow characteristics and the benefaction of turbulent bursting structures at the initiation of erosion process and before the failure of the cohesive bank due to undercut progression are discussed. The results show that velocity and Reynolds shear stress have direct dependence on the size and rate of the entrainment of cohesive aggregates from bank face. The effect of wave-current motion leads to an increase in shear stress at the lateral bank giving rise to erosion and transportation of sediment particles/aggregates. Quadrant analysis of the random velocity fluctuation under wave-current flow at the initiation of erosion process shows strong presence of ejection and sweep events. Findings from the present study may provide a better understanding on the design of cohesive bank erosion control measures.

地表波和水流对河岸的综合作用对水动力的影响对于理解泥沙夹带，输运和河岸线的后处理过程至关重要。为了理解湍流结构在感应波流作用下的时间效应，进行了一系列实验室实验。同时使用微声多普勒测速仪（ADV）和超声测距系统（URS）来测量速度波动和堤岸底切深度增量。讨论了在侵蚀过程开始时以及由于底切进展而导致的粘性堤破坏之前，湍流特征的调制和湍流破裂结构的受益。结果表明，速度和雷诺剪切应力直接取决于从河岸面夹带的聚集体的夹带大小和速率。波流运动的影响导致侧向堤岸处的剪切应力增加，从而导致沉积物颗粒/聚集体的侵蚀和运输。在侵蚀过程开始时，波浪电流作用下的随机速度波动的象限分析表明，强烈存在喷射和扫掠事件。从本研究的发现可能会提供对粘性河岸侵蚀控制措施设计的更好理解。在侵蚀过程开始时，波浪电流作用下的随机速度波动的象限分析表明，强烈存在喷射和扫掠事件。从本研究的发现可能会提供对粘性河岸侵蚀控制措施设计的更好理解。在侵蚀过程开始时，波浪电流作用下的随机速度波动的象限分析表明，强烈存在喷射和扫掠事件。从本研究的发现可能会提供对粘性河岸侵蚀控制措施设计的更好理解。