Experiments on turbidity currents over an erodible bed
Experiments on turbidity currents over an erodible bed
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DOI：
10.1080/00221688709499292
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发表时间：
1987
影响因子：
2.3
通讯作者：
G. Parker;Marcelo H. García;Y. Fukushima;W. Yu
中科院分区：
文献类型：
--
作者：
G. Parker;Marcelo H. García;Y. Fukushima;W. Yu
进行了实验，以确定与非粘性粉砂（硅粉）的浊流的行为移动下的斜坡，其床是覆盖着类似的粉砂。在恒定的入口条件下维持每个电流6至8分钟。没有研究头部的运动;测量集中在电流的连续部分，该部分在时间上基本恒定，但在空间上发展。仅研究了超临界电流。水流可以自由地从河床上冲刷沉积物，也可以在河床上沉积存款物。下游流速和含沙量的垂直剖面测量允许近似相似关系的发展。这些关系可以用来估计大多数的形状因子，发生在垂直积分运动方程。这些值不会严重偏离使用“顶帽”函数（即阶跃函数）得到的值，使得速度或浓度等于层中的平均值。
Experiments were conducted to determine the behaviour of turbidity currents laden with non-cohesive silt (silica flour) moving down a slope the bed of which is covered with similar silt. Each current was sustained with constant inlet conditions for six to eight minutes. The motion of the head was not studied; measurements were concentrated on the continuous part of the current that was essentially constant in time but developing in space. Only supercritical currents were studied. The currents were free to erode sediment from, and deposit sediment on, the bed. Measurements of vertical profiles of downstream velocity and sediment concentration allowed for the development of approximate similarity relations. These relations can be used to estimate most of the shape factors that occur in the vertically-integrated equations of motion. The values do not deviate grossly from those found by using a "top-hat" function, i.e. a step function, such that velocity or concentration equals its average value in the layer ...