Investigation of Colloid Transport under Unsaturated Steady Flow Conditions Using a Geocentrifuge

使用地力离心机研究不饱和稳流条件下的胶体输运

基本信息

项目摘要

Subsurface colloids can enhance the movement of strongly sorbing contaminants, a phenomenon called colloid-facilitated contaminant transport. In the presence of mobile subsurface colloids, contaminants may move faster and farther than in the absence of colloids, thereby bypassing the filter and buffer capacity of soils and sediments. Fate and transport models neglecting colloid-facilitated transport therefore often underpredict contaminant movement. Long-term predictions of contaminant fate and transport as well as risk assessment rely on an accurate representation of subsurface processes, and in the case of strongly sorbing contaminants, need to consider mobile colloids as potential contaminant carriers. The overall goal of this research project is to elucidate the relevant mechanisms controlling colloid fate and transport in unsaturated porous media, with emphasis on soils and sediments. The specific objectives are to (1) improve experimental measurement techniques to quantify colloid transport under unsaturated flow conditions; (2) delineate the importance of water content vs flow rate on colloid mobilization and transport in unsaturated porous media; and (3) modify an existing colloid transport code (Hydrus-1D) by incorporating mathematical formulations of the relevant colloid transport processes. The use of a geocentrifuge offers completely new experimental opportunities to study colloid transport in porous media. By changing the acceleration of the experimental setup the water content and the hydraulic flow rate of the porous media can be controlled independently. Therefore, the role and the interplay of these factors can be elucidated to obtain a mechanistic understanding of colloid transport and mobilization. Experiments can also be conducted with materials of low hydraulic conductivity, and the experimental time can be shortened. I will design a novel experimental system for use in a geocentrifuge, and will conduct a series of colloid transport experiments under unsaturated flow. Additionally, I will validate and generalize the experimental measurements and results by using a new modelling approach. An unsaturated flow and transport code (Hydrus-1D) will be modified to include variable accelerations (higher than gravity) to accommodate the geocentrifuge system. The modified Hydrus code will be used to extrapolate and scale measurements back to normal gravity.
地下胶体可以增强强吸附性污染物的移动,这种现象称为胶体促进污染物传输。在存在移动的地下胶体的情况下,污染物可能比没有胶体的情况下移动得更快更远,从而绕过土壤和沉积物的过滤和缓冲能力。因此,忽略胶体促进运输的归宿和运输模型往往低估了污染物的运动。污染物归宿和迁移的长期预测以及风险评估依赖于对地下过程的准确描述,在强吸附污染物的情况下,需要考虑将移动的胶体作为潜在的污染物载体。本研究计划的总体目标是阐明控制胶体在非饱和多孔介质中的命运和运输的相关机制,重点是土壤和沉积物。具体目标是:(1)改进实验测量技术,以量化非饱和流动条件下的胶体输运;(2)描述含水量与流速对非饱和多孔介质中胶体流动和输运的重要性;(3)通过纳入相关胶体输运过程的数学公式,修改现有的胶体输运代码(Hydrus-1D)。地质沉降仪的使用为研究胶体在多孔介质中的运移提供了全新的实验机会。通过改变实验装置的加速度,可以独立地控制多孔介质的含水量和水力流量。因此,可以阐明这些因素的作用和相互作用,以获得对胶体运输和动员的机械理解。也可以用低导水率的材料进行实验,可以缩短实验时间。本人将设计一套新颖的土工试验系统,并进行一系列非饱和水流下胶体运移的试验。此外,我将使用一种新的建模方法验证和推广的实验测量和结果。将修改不饱和流动和运输代码(Hydrus-1D),以包括可变加速度(高于重力),以适应地质中心系统。修改后的Hydrus代码将用于外推和缩放测量回到正常重力。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Does Water Content or Flow Rate Control Colloid Transport in Unsaturated Porous Media?
  • DOI:
    10.1021/es404705d
  • 发表时间:
    2014-04-01
  • 期刊:
  • 影响因子:
    11.4
  • 作者:
    Knappenberger, Thorsten;Flury, Markus;Harsh, James B.
  • 通讯作者:
    Harsh, James B.
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Dr. Thorsten Knappenberger其他文献

Dr. Thorsten Knappenberger的其他文献

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