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Hyporheic exchange controlled by dynamic hydrologic boundary conditions
Author(s) -
Schmadel Noah M.,
Ward Adam S.,
Lowry Christopher S.,
Malzone Jonathan M.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068286
Subject(s) - aquifer , hyporheic zone , diel vertical migration , hydrology (agriculture) , residence time (fluid dynamics) , geology , flow (mathematics) , groundwater , forcing (mathematics) , environmental science , streams , groundwater flow , boundary (topology) , soil science , atmospheric sciences , geotechnical engineering , geometry , oceanography , mathematics , computer science , mathematical analysis , computer network
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.