地下水人工回灌物理堵塞特征及机理试验分析

通过砂柱试验模拟了填砾石滤料雨洪水地下水人工回灌过程,通过3组对比试验分析了砾石滤料的厚度和砾石的粒径对物理堵塞控制效果的影响。试验结果表明,砾石反滤层能够在很大程度上去除回灌水中的悬浮物,进而起到控制堵塞,提高补给效率的作用。砾石反滤层的厚度和粒径选择对堵塞的控制效果起到关键作用,反滤层厚度越大,对堵塞的控制效果越好。反滤层对回灌水悬浮物的去除作用是有限的,而且随着时间的延长,到达反滤层和砂样界面的悬浮物浓度变大,因此反滤层并不能完全避免堵塞的发生,必须定期对反滤层底部的淤泥层进行处理。

Experimental Research on the Characteristics and Mechanism of Clogging during Artificial Groundwater Recharge

The gravel filter effects on suspended matters and the control effect on clogging are analyzed by using storm water gravel infiltration column experiments.Three groups of contrast experiments are used to analyze the influence on controlling clogging of the gravel thickness and the gravel particle difference.The results show that gravel filter plays an important role in controlling clogging and improving recharge efficiency by the great removal ability on the suspended matters in the recharge water.The choices of the thickness and the particle size of the gravel filter played important roles in control effect on clogging,which is manifested as the thicker the graver filter,the better control effect.