Erosion and Deposition of Cohesive Soils
Erosion and Deposition of Cohesive Soils
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DOI：
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发表时间：
1965
影响因子：
2.4
通讯作者：
E. Partheniades
中科院分区：
文献类型：
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作者：
E. Partheniades
本文研究了剪切应力、悬沙浓度和床面抗剪强度对盐水明渠粘性河床冲刷率的影响。悬浮粘性泥沙的沉积速率和河床冲刷模式的研究程度较低。对于实验范围内的侵蚀率被发现是独立的床的剪切强度和悬浮泥沙的浓度。它们强烈地依赖于床面切应力。起动冲刷所需的最小切应力与床面抗剪强度无关。悬浮沉积物中的粘土部分似乎存在一个临界流速，在此流速以上，所有的粘土沉积物都保持悬浮状态，而即使流速略低于此临界极限，悬浮粘土也会迅速沉积。冲刷主要发生在水槽中心附近一个明确界定的狭窄且相对平直的区域内。
The effects of shear stress, suspended sediment concentration, and shear strength of bed on the erosion rates of a cohesive bed in an open channel with salt water have been investigated. The deposition rates of suspended cohesive sediment and the patterns of bed erosion have been studied to a lesser extent. For the experimental range the erosion rates were found to be independent of the shear strength of the bed and the concentration of suspended sediment. They depend strongly on the bed shear stress. The minimum shear stresses for initiation of erosion were also found to be independent of the shear strength of bed. There seems to exist a critical velocity for the clay part of suspended sediment, above which all such sediment remains in suspension, whereas even for velocities slightly below this critical limit, the suspended clay deposits rapidly. Scouring occurred predominantly within a well defined narrow and relatively straight zone near the center of the flume.