Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 9, Pages 4408-4417Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL068286
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Funding
- National Science Foundation [EAR 1331906]
- NSF [EAR 1505309]
- U.S. Department of Agriculture (USDA) [2013-67019-21365]
- Indiana University Office of the Vice Provost for Research
- Indiana Water Resources Research Center
- Directorate For Geosciences
- Division Of Earth Sciences [1331906] Funding Source: National Science Foundation
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The relative roles of dynamic hydrologic forcing and geomorphology as controls on the timescales and magnitudes of stream-aquifer exchange and hyporheic flow paths are unknown but required for management of stream corridors. We developed a comprehensive framework relating diel hydrologic fluctuations to hyporheic exchange in the absence of geomorphic complexity. We simulated groundwater flow through an aquifer bounded by a straight stream and hillslope and under time-varying boundary conditions. We found that diel fluctuations can produce hyporheic flow path lengths and residence times that span orders of magnitude. With these results, hyporheic flow path residence times and lengths can be predicted from the timing and magnitude of diel fluctuations and valley slope. Finally, we demonstrated that dynamic hydrologic boundary conditions can produce spatial and temporal scales of hyporheic flow paths equivalent to those driven by many well-studied geomorphic features, indicating that these controls must be considered together in future efforts of upscaling to stream networks.
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