Contaminant Transport Processes Between Water and Sediment Beds in Rivers

这是一项支持有毒污染物在流动的自然水域中传输的研究，涉及溪流和用作污染物储存地点的溪流沉积物之间的交换过程。这项研究包括利用吸附无机污染物和利用一条5米长的带有细沙床的循环实验室水槽来研究河床交换的基本原理。计划使用的吸附无机示踪剂包括二价钙和三价铝和铬阳离子。研究人员计划在进行水槽实验之前，在批量工作中使用可吸附的阳离子染料示踪剂亚甲基蓝来建立有机污染物的平衡和动力学行为。该项目由流体、颗粒和液压系统计划以及环境和海洋系统计划的环境工程元素共同支持。受污染沉积物中的水污染物对水质的贡献与水质之间的关系尚不清楚，这些沉积物是通过影响沉积物和受流体运动扰动的颗粒之间的相对运动的物理过程而接触的。期望这项研究的结果将有助于建立比目前更好的流动水与污染水体的有机和无机污染物污染的沉积物之间的相互作用模型，并将这些模型应用于环境和水利工程实践。

This is an award to support research on transport of toxic contaminants in flowing, natural waters involving exchange processes between the stream-flow and the stream sediments which act as storage locations for the contaminants. The research involves investigation of the fundamentals of stream-bed exchange using adsorbing inorganic contaminants and utilizing a five-meter long recirculating laboratory flume with a fine sand bed. Adsorbing inorganic tracers planned for use include bivalent calcium and trivalent aluminum and chromium cations. The investigators plan on using the adsorbable cationic dye tracer methylene blue to establish equilibrium and kinetic behavior of organic contaminants in batch-scale work before proceeding to flume experiments. This project is being jointly supported by the Fluid, Particulate and Hydraulic Systems Program and the Environmental Engineering element of the Environmental and Ocean Systems Program. The relationship of bed-contribution of water pollutants from contaminated sediments to water quality with which those sediments are placed into contact by physical processes influencing the relative motion between sediments and particles disturbed by fluid motion are not well understood. It is expected that results of this research will contribute toward formulation of better models than now exist of interactions between water in motion and sediments contaminated with organic and inorganic pollutants that contaminate the water, and application of those models in environmental and hydraulic engineering practice.