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|a Quantifying the effects of three-dimensional subsurface heterogeneity on Hortonian runoff processes using a fully-coupled numerical, stochastic approach.
|h [electronic resource]
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|a Washington, D.C :
|b United States. Dept. of Energy ;
|a Oak Ridge, Tenn. :
|b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
|c 2007.
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|a PDF-file: 32 pages; size: 0.5 Mbytes.
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|a text
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|a Published through the Information Bridge: DOE Scientific and Technical Information.
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|a 08/23/2007.
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|a "ucrl-jrnl-233964"
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|a Advances in Water Resources, vol. 30, no. 12, July 6, 2007, pp. 2477-2466 30 12 FT.
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|a Maxwell, R M; Kollet, S J.
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|a The impact of three-dimensional subsurface heterogeneity on hillslope runoff generated by excess infiltration (so called Hortonian runoff) is examined. A fully-coupled, parallel subsurface overland flow model is used to simulate runoff from an idealized hillslope. Ensembles of correlated, Gaussian random fields of saturated hydraulic conductivity are used to create uncertainty and variability (i.e. structure) due to subsurface heterogeneity. A large number of cases are simulated in a parametric manner with variance of the hydraulic conductivity varied over two orders of magnitude. These cases include rainfall rates above, equal and below the geometric mean of the hydraulic conductivity distribution. These cases are also compared to theoretical considerations of runoff production based on simple assumptions regarding (1) the rainfall rate and the value of hydraulic conductivity in the surface cell using a spatially-indiscriminant approach; and (2) a percolation-theory type approach to incorporate so-called runon. Simulations to test the ergodicity of hydraulic conductivity on hillslope runoff are also performed. Results show three-dimensional features (particularly in the vertical dimension) in the hydraulic conductivity distributions that create shallow perching, which has an important effect on runoff behavior that is fundamentally different in character than previous two dimensional analyses. The simple theories are shown to be very poor predictors of the saturated area that might runoff due to excess infiltration. It is also shown that ergodicity is reached only for a large number of integral scales (≈30) and not for cases where the rainfall rate is less than the geometric mean of the saturated hydraulic conductivity.
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|b W-7405-ENG-48.
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|a Runoff.
|2 local.
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|a Hydraulic Conductivity.
|2 local.
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|a Flow Models.
|2 local.
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|a Distribution.
|2 local.
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|a Production.
|2 local.
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|a Geosciences.
|2 edbsc.
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|a Environmental Sciences.
|2 edbsc.
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| 710 |
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|a Lawrence Livermore National Laboratory.
|4 res.
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| 710 |
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|a United States.
|b Department of Energy.
|4 spn.
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|4 dst.
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| 856 |
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|u http://www.osti.gov/servlets/purl/926053-kB6qtM/
|z Online Access
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|c 04-01-12
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|e E 1.99:ucrl-jrnl-233964
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