砂柱的颗粒组成、水含沙量和入渗水头对滞留分布产生显著的影响。

Gradation of sand column and sediment concentration of muddy water and water head are remarkably effective factors for the fine grain distribution in sand column.

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砂柱上部的总水头在排水结束时仍然高于底部定水头边界处的水头。

The total head in the upper portion of the column is higher than the head at the constant head boundary even at the end of drainage.

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砂柱下部饱和并处于静水平衡状态，在底部为定水头的条件下进行排水。

The sand column, saturated at its lower portion and initially in the condition of hydrostatic equilibrium, is drained at its bottom at constant head.

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