地下水人工回灌气相堵塞特征的试验研究

发布时间：2018-06-06 13:20

本文选题：地下水人工回灌 + 气相堵塞　；参考：《水科学进展》2017年05期

【摘要】：地下水人工回灌可以高效地利用雨季丰沛的水量来缓解地下水过量开采造成的海水入侵、泉水断流等环境水文地质问题,但回灌堵塞一直是制约人工回灌效率的关键问题。针对雨洪水回灌携带的大量气泡问题,设计室内砂柱试验模拟装置,利用曝气水进行人工回灌,定时记录试验过程中测压管读数及出流流量,利用达西定律计算各层渗透系数,研究气相堵塞的发展过程和规律。结果表明:回灌过程中由于气相堵塞导致含水层渗透系数随时间呈指数衰减,气相堵塞主要发生在介质浅表层(0~30 cm),且随时间有向下发展的趋势,堵塞速率随深度的增加逐渐减小,在回灌过程中适时停灌进行排气有利于减小气相堵塞对回灌效率的影响。
[Abstract]:Artificial recharge of groundwater can effectively use the abundant water in the rainy season to alleviate the water intrusion caused by overexploitation of groundwater, water disconnection and other environmental hydrogeological problems, but the recharge blockage has been a key problem that restricts the efficiency of artificial recharge. In view of the large number of bubbles in the recharge of rain and flood, the simulation of indoor sand column test is designed. The device, using aeration water for artificial recharge, regularly records the reading and discharge of the pressure tube during the test, and uses Darcy's law to calculate the permeability coefficient of each layer, and studies the development process and law of the gas phase blockage. The results show that the permeability coefficient of the water bearing layer attenuates exponentially with the time and the main gas phase is blocked in the process of recharge. To occur on the shallow surface of the medium (0~30 cm), and with the trend of downward development with time, the blocking rate gradually decreases with the increase of depth. In the process of recharge, the timely stop of the exhaust is beneficial to the effect of reducing the gas phase blocking on the recharge efficiency.
【作者单位】：河海大学水文水资源学院;河海大学水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金资助项目(41572210)~~
【分类号】：P641.25

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