HR: 1330h
AN: H43B-01    [Abstracts]
TI: Modeling the Effect of Compaction on the Soil Hydraulic Properties
AU: * Assouline, S
EM: vwshmuel@agri.gov.il
AF: A.R.O. - Volcani Center, POB 6, Bet Dagan, 50250 Israel
AB: Compaction affects the soil hydraulic properties, and consequently, has an important impact on rainfall-infiltration-runoff relationships. In this study, models are suggested that could quantify and predict the effect of compaction on the soil water retention curve (WRC) and the soil hydraulic conductivity function (HCF). Two expressions for the WRC are considered, and the relationships between their parameters and the bulk density of the compacted soil are determined. Two expressions were developed that predict the saturated hydraulic conductivity of compacted soils; the first is a general expression based on the Kozeny equation that requires information only on the bulk density; the second one exploits information contained in the WRC. One expression was suggested to predict the unsaturated HCF of compacted soils. The models were calibrated and validated against experimental data of soils at various levels of compaction. The relationships between the various parameters and the soil bulk density enable a relatively good prediction of the effect of compaction on the soil hydraulic properties. The relationship between the pore-size distribution index, Ÿš, and the coefficient of variation of the WRC, ŸO, of the compacted soils was found to be similar to that previously found for a wide range of soil types. It is shown that the relationship between ŸO, the power parameter in the expression for the HCF, and ŸO, previously found to represent a large variety of soil types, remains valid also for compacted soils.
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
SC: Hydrology [H]
MN: 2005 Joint Assembly