局部高位入渗对渗透池入渗速率的影响

Impacts of local high-level infiltration to infiltration rate of the infiltration basin

含水层中的弱透水层和回灌过程中的堵塞问题是影响地下水人工回灌工程效率和寿命的关键问题。本文通过室内实验,模拟了自然状态地表覆盖有弱透水层的情况下,正常回灌、局部开挖回填砂砾石,以及设计的局部高位入渗方法对渗透池入渗速率的影响。实验证明,实践中通常采用的局部开挖回填砂砾石的方法对入渗效率的提高是有效的,但是由于回灌水源在渗透介质表层均匀沉积,易形成堵塞。本文在该方法基础上改进设计的局部高渗透高位入渗的方法。经实验验证与机理分析,不仅能有效提高入渗效率,而且有效推迟入渗速率下降拐点的出现时间,降低入渗速率的衰减速度。

The aquitard in aquifer and the blocking in recharge are always the key factors to influence the efficiency and lifetime of the recharge project.Based on the indoor tests and under the condition of the aquitard existed,the influence of the normal recharge and the local high-level infiltration to the infiltration rate of the infiltration basin is simulated.The tests show that the local sand gravel filling is effective to increase the hydraulic conductivity,but the blocking on the backfilled surface forms rapidly owing to the symmetrical sedimentation on the surface of the seepage medium.The new infiltration technique to keep the infiltration process takes place in a certain level which is a little higher than the aquifer surface is designed,which is quite helpful to prolong the natural life of the infiltration facility and improves the infiltration efficiency.