滹沱河冲洪积扇浅部回灌层井灌动态分析及回渗能力探究

随着地下水资源的加剧开采和补给的减少,滹沱河冲洪积扇形成的厚包气带区有着巨大的回灌潜力,但相关回灌试验研究较少。通过在滹沱河冲洪积扇藁城段开展一系列低水位、高水位井灌试验,获得了回灌井与观测井水力联系的强弱及井周边的渗透情况;在连续回灌中回灌井会发生一定程度堵塞,适时回扬能使回渗能力得到一定程度恢复;各回灌井有较大的回灌能力,均大于50 m~3/h;区内三个主要回灌层(饱水带、深层包气带、浅层包气带)在井灌条件下都有较强的渗透能力,但受成井差异和地层结构差异性影响,不同井内的渗透能力不同。新形势下在冲洪积扇厚包气带区适时开展地下水人工回灌是解决水资源储存和相关水文地质问题的一个有效途径。

Analysis of dynamics of the well recharge and exploration of the recharge infiltration ability in the shallow recharge layer of the alluvial fan of Hutuo River

As groundwater is mined aggravatedly and the recharge amount decreases, the area of unsaturated zone formed in the alluvial fan of Hutuo River has huge recharge potentiality. However, the related researchful recharge tests are less. So a series of recharge tests with low and high water level were carried out. How strong the hydraulicSconnection between the recharge and observation wells can be obtained, as well as the infiltration situation around the recharge well. A certain extent blocking can occur in the well with continuous recharging. Luckily,the infiltration ability can be recovered by timely pump lifting. Each recharge well has huge recharge ability,which is all more than 50 m3/h. The three main recharge layers also have huge infiltration ability under the well-recharging condition. But it is influenced by the differences of the well and stratum structure. So the penetration capacity is difference indifferent wells. Groundwater artificial recharge with timely carried out is an effect way for storing water and solving the relative problems of hydrogeololgy in the area of unsaturated zone of the alluvial fan.