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WRRCSR No.06:30:91(II) Simulation of Solute Transport in Heterogeneous Soils - Volume II: Numerical Experiments

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Title: WRRCSR No.06:30:91(II) Simulation of Solute Transport in Heterogeneous Soils - Volume II: Numerical Experiments
Authors: Liu, Clark C.K.
Loague, Keith
Azimi-Zonooz, Ali
Feng, Jing-Song
Keywords: solute transport
permeability coefficient
pesticides
stochastic process
leaching
show 5 moregroundwater pollution
macrodispersion
heterogeneous soils
Hawaii Oxic soils
Oahu

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LC Subject Headings: Agricultural chemicals -- Environmental aspects -- Mathematical models.
Groundwater -- Pollution -- Mathematical models.
Groundwater flow -- Environmental aspects -- Mathematical models.
Soils -- Hawaii -- Oahu.
Soils -- Solute movement -- Mathematical models.
Issue Date: Jun 1991
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Liu CCK, Loague K, Azimi-Zonooz A, Feng JS. 1991. Simulation of solute transport in heterogeneous soils - volume II: numerical experiments. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC special report, 06:30:91(II).
Series/Report no.: WRRC Special Reports
06:30:91(II)
Abstract: Spatial variability of saturated hydraulic conductivity is examined to assess the effect of uncertainty in leaching of pesticides from heterogeneous soils. Saturated hydraulic conductivity, an important soil parameter that controls the transport of pesticides in soils, is assumed to be composed of a homogeneous mean value and a perturbation caused by the spatial variability of soil properties producing a stochastic process in the mean flow direction. The spatial heterogeneity of porous soils is characterized by the
variance and the correlation scale of the saturated hydraulic conductivity in the transport domain. In the first part of the study, numerical experiments are used to investigate the development of scale-dependent macrodispersivity in the unsaturated heterogeneous soils. In the second part of the study, the significance
of the variance on the spatial and temporal distribution of tracer spreading is demonstrated for Hawaii Oxic soils. The significance of variance regarding the spatial and temporal distribution of tracer
concentrations is demonstrated using solute breakthrough curves at various depths in the soil profile. Macrodispersivity values in heterogeneous soils are proportional to the variance at smaller travel distances and converge to the same value at larger travel distances. For greater correlational distances, a faster breakthrough of solutes at various depths was observed.
Sponsor: U.S. Geological Survey Grant/Contract No. B-100
Pages/Duration: viii + 53 pages
URI/DOI: http://hdl.handle.net/10125/8771
Appears in Collections:WRRC Special Reports



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