摘要
河水和地下水交换——潜流交换对溶质和污染物的归宿起着重要作用。潜流交换机理主要包括泵吸交换和冲淤交换。泵吸交换是由于河床形态引起的水头梯度,这些水头梯度诱导了对流传输;冲淤交换发生是由于移动河床截留和释放孔隙水。潜流交换的主要影响因素包括:河道流量、河床水力传导性、河床形态、河道弯曲、河床不均匀和背景条件。还探讨了反应性溶质、胶体颗粒共存情况下潜流交换的规律。对潜流交换研究现存的主要问题及未来研究展望提出了看法。
Surface-subsurface exchange （hyporheic exchange） across the river bed plays an important role in the fate of solutes and contaminants in rivers. The main mechanisms of hyporheic exchange include pumping exchange and turnover exchange. The pumping exchange is driven by pore water flows induced by head gradients. Such head gradients are typically due to inter- actions between currents and the streambed topography. Turnover occurs with the moving bedforms trap and the released the interstitial fluid. The main factors of influence on hyporheic exchange are as follows： the riverine flow rate, the hydraulic conductivity, the bedform, the channel curvature, the streambed heterogeneity and the background conditions. The interplay of the reactive solutes and colloids is reviewed, and the ideas for further studies on hyporheic exchange are proposed.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2008年第2期285-293,共9页
Advances in Water Science
基金
国家杰出青年科学基金资助项目(50425926)~~
关键词
潜流交换
潜流带
泵吸交换
冲淤交换
河床形态
溶质
胶体
hyporheic exchange
hyporheic zone
pumping exchange
turnover exchange
bedform
solute
colloid
