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Particles Release on A Sea-freshwater Interface by Flow Velocity and Rate of Salinity Decrease Effects

机译:流速和盐度降低速率导致的颗粒在海水淡水界面上的释放

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Adopting horizontal column experiments, taking the aquifers sample containing minim clay mineral (mainly illite) in Dagu River aquifer, this paper studies the influences of flow velocity and ionic strength on particles release, as well as the relationship of between them. Through the DLVO theory calculation and the column experiments, the Critical Salt Concentration (CSC) of the Dagu River aquifer is determined as 0.05 mol/L approximately. For the constant velocity, the slower the rate of salinity decrease, the higher the peak of particles concentration is. However, the total amount of colloid particles is almost constant at different rates of salinity decrease. For constant rate of salinity decrease, the peak of particles concentration decreased as velocity increased, but the total amount of particles released rose up. Meanwhile, the experiments also indicated the existence of critical velocity, and revealed that the critical velocity dropped with the increase of salt concentration. When the concentration of NaCl solution decreased from 0.17mol/L to 0.06mol/L, the critical velocity decreased from 3cm/min to 2.5cm/min, which is consistent to the results predicted by DLVO theory.
机译:本文采用水平柱实验,以大沽河含水层中含微量粘土矿物(主要为伊利石)的含水层为样本,研究了流速和离子强度对颗粒释放的影响以及二者之间的关系。通过DLVO理论计算和柱实验,得出大沽河含水层的临界盐浓度(CSC)约为0.05 mol / L。对于恒定速度,盐度降低的速度越慢,颗粒浓度的峰值越高。然而,胶体颗粒的总量在不同的盐度降低速率下几乎是恒定的。对于恒定的盐度降低率,颗粒浓度的峰值随速度增加而降低,但释放的颗粒总量却上升。同时,实验还表明了临界速度的存在,并揭示了临界速度随盐浓度的增加而下降。当NaCl溶液的浓度从0.17mol / L降低到0.06mol / L时,临界速度从3cm / min降低到2.5cm / min,这与DLVO理论预测的结果是一致的。

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