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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。
Weak aquifers in aquifers and plugging during recharge are the key issues affecting the efficiency and longevity of artificial recharge of groundwater. In this paper, we simulate the effects of normal recharge, partial excavation of backfilled gravel, and local high infiltration method on infiltration cell infiltration rate under the condition that the natural surface is covered with aquitard. Experiments show that in practice, the method of local excavation backfilling sand and gravel commonly used is effective to improve the infiltration efficiency, but because of the uniform deposition of recharge water on the surface of the permeable medium, it is easy to form a blockage. In this paper, based on the method to improve the design of the local high permeability infiltration method. The experimental verification and mechanism analysis can not only effectively improve the infiltration efficiency, but also effectively delay the emergence time of infiltration rate decline inflection point and reduce the decay rate of infiltration rate.