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Power-law residence time distribution in the hyporheic zone of a 2nd-order mountain stream

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https://ir.library.oregonstate.edu/concern/articles/n009w378w

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Abstract
  • We measured the hyporheic residence time distribution in a 2nd-order mountain stream at the H. J. Andrews Experimental Forest, Oregon, and found it to be a power-law over at least 1.5 orders of magnitude in time (1.5 hr to 3.5 d). The residence time distribution has a very long tail which scales as t[superscript −1.28], and is poorly characterized by an exponential model. Because of the small power-law exponent, efforts to characterize the mean hyporheic residence time (t[subscript s]) in this system result in estimates that are scale invariant, increasing with the characteristic advection time within the stream channel (t[subscript ad]). The distribution implies the hyporheic zone has a very large range of exchange timescales, with significant quantities of water and solutes stored over time-scales very much longer than t[subscript ad]. The hyporheic zone in such streams may contribute to short-time fractal scaling in time series of solute concentrations observed in small-watershed studies.
  • Keywords: Fractals and multifractals, Hydrology, Mathematical Geophysics, Surface water quality, Geomorphology, Groundwater transport
  • Keywords: Fractals and multifractals, Hydrology, Mathematical Geophysics, Surface water quality, Geomorphology, Groundwater transport
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  • Haggerty, R., S. M. Wondzell, and M. A. Johnson (2002), Power-law residence time distribution in the hyporheic zone of a 2nd-order mountain stream, Geophysical Research Letters, 29(13), 1640, doi:10.1029/2002GL014743.
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  • 29
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  • 13
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  • This work was supported by the National Science Foundation (EAR 99-09564), by the H. J. Andrews Experimental Forest, and by the U.S.D.A. Forest Service, Pacific Northwest Research Station.
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