Abstract
The function and design of a soil cover for dry coal ash deposits have been studied with mathematical models. The soil cover will act as a barrier against infiltration and gas transport. These two functions can be achieved with a two-layered soil cover consisting of a tight layer and a protecting layer. The tight layer is designed with a slope in order to divert the infiltrating water in a lateral direction. The protecting layer makes vegetation possible and protects the tight layer from erosion and drying up. Since the gas transport is strongly dependent on the degree of saturation it is of great importance to maintain almost saturated conditions in the tight layer. Modelling of the unsaturated water and gas transport has been performed for several different designs of the soil cover. The studied parameters are the length of the cover, the slope and the hydraulic conductivity of the tight layer. In most calculations the thickness of the tight layer was 0.3 m and the thickness of the protecting layer 1 m. Variation calculations with a drainage layer and with a weak zone in the tight layer have also been performed. Variations in the climatic conditions were also studied. The
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Lindgren, M;
[1]
Rasmuson, A
[2]
- Kemakta Konsult AB, Stockholm (Sweden)
- Chalmers Univ. of Technology, Gothenburg (Sweden)
Citation Formats
Lindgren, M, and Rasmuson, A.
Deposits of coal fly ash - Calculation of the effect of a soil cover as a gas transport and water infiltration barrier; Deponering av kolaska - Beraekning av effekten av ett taeckskikt som gas- och infiltrationsspaerr.
Sweden: N. p.,
1992.
Web.
Lindgren, M, & Rasmuson, A.
Deposits of coal fly ash - Calculation of the effect of a soil cover as a gas transport and water infiltration barrier; Deponering av kolaska - Beraekning av effekten av ett taeckskikt som gas- och infiltrationsspaerr.
Sweden.
Lindgren, M, and Rasmuson, A.
1992.
"Deposits of coal fly ash - Calculation of the effect of a soil cover as a gas transport and water infiltration barrier; Deponering av kolaska - Beraekning av effekten av ett taeckskikt som gas- och infiltrationsspaerr."
Sweden.
@misc{etde_10140979,
title = {Deposits of coal fly ash - Calculation of the effect of a soil cover as a gas transport and water infiltration barrier; Deponering av kolaska - Beraekning av effekten av ett taeckskikt som gas- och infiltrationsspaerr}
author = {Lindgren, M, and Rasmuson, A}
abstractNote = {The function and design of a soil cover for dry coal ash deposits have been studied with mathematical models. The soil cover will act as a barrier against infiltration and gas transport. These two functions can be achieved with a two-layered soil cover consisting of a tight layer and a protecting layer. The tight layer is designed with a slope in order to divert the infiltrating water in a lateral direction. The protecting layer makes vegetation possible and protects the tight layer from erosion and drying up. Since the gas transport is strongly dependent on the degree of saturation it is of great importance to maintain almost saturated conditions in the tight layer. Modelling of the unsaturated water and gas transport has been performed for several different designs of the soil cover. The studied parameters are the length of the cover, the slope and the hydraulic conductivity of the tight layer. In most calculations the thickness of the tight layer was 0.3 m and the thickness of the protecting layer 1 m. Variation calculations with a drainage layer and with a weak zone in the tight layer have also been performed. Variations in the climatic conditions were also studied. The design of the cover may be modified by increasing the thickness of the protecting layer or by exchange of the bottom part of the protecting layer for a drainage layer. The latter alternative was simulated in a calculation which showed a very good ability to divert the water in lateral direction, but resulted in too dry conditions with high gas transport as a consequence. Theoretically, a cover including drainage layer could be optimized to give both an acceptable gas transport and a high drainage capacity. In practice, however, the long term quality of the cover could be a problem. (14 refs., 17 figs., 1 tab.).}
place = {Sweden}
year = {1992}
month = {May}
}
title = {Deposits of coal fly ash - Calculation of the effect of a soil cover as a gas transport and water infiltration barrier; Deponering av kolaska - Beraekning av effekten av ett taeckskikt som gas- och infiltrationsspaerr}
author = {Lindgren, M, and Rasmuson, A}
abstractNote = {The function and design of a soil cover for dry coal ash deposits have been studied with mathematical models. The soil cover will act as a barrier against infiltration and gas transport. These two functions can be achieved with a two-layered soil cover consisting of a tight layer and a protecting layer. The tight layer is designed with a slope in order to divert the infiltrating water in a lateral direction. The protecting layer makes vegetation possible and protects the tight layer from erosion and drying up. Since the gas transport is strongly dependent on the degree of saturation it is of great importance to maintain almost saturated conditions in the tight layer. Modelling of the unsaturated water and gas transport has been performed for several different designs of the soil cover. The studied parameters are the length of the cover, the slope and the hydraulic conductivity of the tight layer. In most calculations the thickness of the tight layer was 0.3 m and the thickness of the protecting layer 1 m. Variation calculations with a drainage layer and with a weak zone in the tight layer have also been performed. Variations in the climatic conditions were also studied. The design of the cover may be modified by increasing the thickness of the protecting layer or by exchange of the bottom part of the protecting layer for a drainage layer. The latter alternative was simulated in a calculation which showed a very good ability to divert the water in lateral direction, but resulted in too dry conditions with high gas transport as a consequence. Theoretically, a cover including drainage layer could be optimized to give both an acceptable gas transport and a high drainage capacity. In practice, however, the long term quality of the cover could be a problem. (14 refs., 17 figs., 1 tab.).}
place = {Sweden}
year = {1992}
month = {May}
}