不同补给条件下裂隙-管道介质间水流交换的示踪试验研究

摘要

To explore the movement of groundwater between fissures and sinkholes under different recharge modes through a fissure-conduit medium model,the HD camera and colored tracer are adopted to observe the movement of groundwater in a karst groundwater system.In this paper,we design three kinds of recharge mode:recharge only through fissures,recharge through both the sinkholes and fissures and separated recharge through fissures and sinkholes at the same time.The results indicate that the influence of the sinkhole on the diffusion of the fissure water decreases with the increasing distance between the fissure and the sinkhole.Compared with the recharge mode only through fissures,sinkholes have more influence on the diffusion of the fissure water when recharge through both sinkholes and fissures exists.When separated recharge through sinkholes and fissures with equal water quantity exists simultaneously,only the groundwater in fissures flows into sinkholes.%为探究岩溶含水系统中裂隙-管道介质间不同补给方式下水流交换情况,在实验室内借助高精度摄像仪和有色示踪剂对其进行可视化观测.设计多组试验对单独补给裂隙、共同补给、裂隙和落水洞分开同时补给三种补给方式下水流交换情况进行探讨,从而定性地分析水流交换情况.试验结果表明:落水洞对裂隙水扩散的影响随裂隙距离落水洞的距离增大而减小;相较于共同补给情况,单独补给裂隙情况下落水洞对裂隙水扩散影响较大;在分开同时补给情况下裂隙与落水洞补给水量相同时,仅呈现裂隙对落水洞的单向补给.