Effects of stream-aquifer disconnection on local flow patterns
Article first published online: 16 SEP 2008
Copyright 2008 by the American Geophysical Union.
Water Resources Research
Volume 44, Issue 9, September 2008
How to Cite
2008), Effects of stream-aquifer disconnection on local flow patterns, Water Resour. Res., 44, W09501, doi:10.1029/2007WR006782., , and (
- Issue published online: 16 SEP 2008
- Article first published online: 16 SEP 2008
- Manuscript Accepted: 9 JUL 2008
- Manuscript Revised: 31 MAY 2008
- Manuscript Received: 20 DEC 2007
- stream bank
 Disconnected stream-aquifer systems are becoming increasingly common because of lowering groundwater tables. This work focuses on the pathways and rates of infiltration and seepage as streams transition from fully connected to disconnected conditions. HYDRUS-2D simulations show for a connected stream, water infiltrates vertically then moves laterally below the top of the preflooding capillary fringe height, finally causing an upward displacement of antecedent water into the vadose zone. This contradicts the commonly held assumption that stream water moves laterally for some distance into the stream bank, forming a wedge above the antecedent water. Even for shallow disconnections (<1 m), there is an increase in infiltration losses from the stream, elimination of postflooding seepage, and increased lateral and vertical mixing of stream water and antecedent pore water.