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WRRCSR No.06:30:91(II) Simulation of Solute Transport in Heterogeneous Soils - Volume II: Numerical Experiments
|Title:||WRRCSR No.06:30:91(II) Simulation of Solute Transport in Heterogeneous Soils - Volume II: Numerical Experiments|
|Authors:||Liu, Clark C.K.|
show 5 moregroundwater pollution
Hawaii Oxic soils
|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|
|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|
|Appears in Collections:||WRRC Special Reports|
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