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首页> 外文期刊>Water >Clogging of Infiltration Basin and Its Impact on Suspended Particles Transport in Unconfined Sand Aquifer: Insights from a Laboratory Study
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Clogging of Infiltration Basin and Its Impact on Suspended Particles Transport in Unconfined Sand Aquifer: Insights from a Laboratory Study

机译：渗透盆地的堵塞及其对无凝固砂含水层悬浮颗粒输送的影响：实验室研究中的见解

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A laboratory study was undertaken to investigate the physical clogging of a sand medium by injecting suspended particles (SP), with diameters ranging from 0.03 to 63.41 μm, into an infiltration basin, which was installed in a sand tank under the condition of constant head. The hydraulic conductivity ( K ) of the saturated porous medium was found to have decreased by 27% because of re-arrangement over the seven days of self-filtration. A clogging layer was observed on the infiltration basin bottom, probably due to straining over the stormwater infiltration stage. Particle-size analyses also indicate that retention of bigger SP led to faster straining of smaller SP, despite the small fraction of bigger SP. The clogging layer weakened the hydraulic connection between the water level in the basin and the water table of the unconfined aquifer until nearly no water could infiltrate into the aquifer. The deposition of finer SP that entered into the aquifer are governed by the hydrodynamic forces. These finer SP caused non-uniform permeability reduction of the porous medium, with an estimated 35% of permeability reduction occurring beneath the infiltration basin. However, the reduction appears to be reversible, as the fine SP deposited on the pore surfaces of the porous medium can be released or detached by the continuous horizontal hydraulic gradient. Extended tailing of the outlet breakthrough curve (BTC) also strongly supported the detachment of SP. This study focused on the effects of particles’ polydispersity and hydrodynamic forces on the hydraulic characteristics of the porous medium.
机译：进行了实验室研究以研究悬浮颗粒（SP），直径为0.03至63.41μm的渗透盆地来研究砂介质的物理堵塞，进入渗透盆地，该盆地安装在恒定头部条件下的砂罐中。发现饱和多孔介质的液压导电性（k）在自过滤的七天内重新安排，饱和多孔介质的液压导电性（k）减少了27％。在渗透盆地底部观察到堵塞层，可能是由于雨水渗透阶段的紧张。粒度分析还表明，尽管较大的SP分数小，但较大的SP的保留导致较小的SP更快地紧张。堵塞层削弱了盆地水位与非整合含水层的水位之间的液压连接，直到几乎没有水可以渗透到含水层中。进入含水层的更精细的SP的沉积由流体动力学控制。这些更细的SP导致多孔介质的不均匀渗透性降低，估计在渗透盆地下方发生的35％的渗透性降低。然而，减少似乎是可逆的，因为沉积在多孔介质的孔表面上的精细SP可以通过连续水平液压梯度释放或分离。出口突破曲线（BTC）的延长拖尾也强烈支持SP的脱离。该研究专注于粒子的多分散性和流动力力对多孔介质的液压特性的影响。

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