Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9491292 | Journal of Hydrology | 2005 | 16 Pages |
Abstract
The hydraulic properties are calculated from the measured bulk densities and texture data, using the Kozeny-Carman-equation for the saturated hydraulic conductivity, Ks, and the Arya-Paris approach for the water retention characteristics, Ï(θ). The effective porosity for Ks is reduced and the water retention increased in proportion to the lignite contents. Small-scale variability of hydraulic parameters is evaluated by using photographs of lignitic fragment distributions. For the discernable inclined layer structures, with a width of approximately 40 cm and a dip of 35°, Ks values in the range between 2.5 and 250 cm/d are estimated. The variability of the water retention characteristics is less pronounced. The predicted Ï(θ) functions are more comparable with loamy than sandy soils. The small-scale intra-layer variability of hydraulic parameters is higher than for lignite-poor mine spoil sediments and for most natural soils. The results may help to improve the analyses of flow and transport in lignitic mine soils by providing 2D two-scale parameter distributions for numerical simulations.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Uwe Buczko, Horst H. Gerke,