FOR 831: Dynamic Capillary Fringes - A Multidisciplinary Approach

毛管边缘是水饱和含水层和包气带交界处的高度动态区，那里有陡峭的生物地球化学梯度，因此具有很高的生物活性。由于这一动态区域在野外的可及性非常有限，计划进行良好控制的试验台和更大规模的实验室实验，以阐明毛细管边缘的物理(流动、扩散、弥散)、地球化学(溶解/沉淀)和生物(代谢、排泄、生物膜形成)过程及其在瞬变条件下的相互作用。重点将放在有机和无机污染物的反应迁移以及悬浮地下水细菌、生物膜和代谢产物对传质和周转过程的影响上。重点放在创新的高分辨率(时间和空间)传感器和用于量化浓度梯度的光谱工具上。

Capillary fringes are highly dynamic zones at the interface between water-saturated aquifer and vadose zone, where steep biogeochemical gradients and thus high bioactivities are expected. Since the accessibility of this dynamic region in the field is very limited, well controlled bench and larger scale laboratory experiments to elucidate physical (flow, diffusion, dispersion), geochemical (dissolution/precipitation) and biological (metabolism, excretion, biofilm formation) processes in the capillary fringe and their interaction under transient conditions are planned. The focus will be on the reactive transport of organic and inorganic pollutants and on the influence of suspended groundwater bacteria, biofilms and metabolic products on mass transfer and turnover processes. Emphasis is directed on innovative high resolution (time and space) sensors and on spectroscopic tools for quantification of concentration gradients.