Experimental and numerical studies on solute transport in unsaturated heterogeneous porous media under evaporation conditions

摘要

Groundwater level rise, root water uptake, or evaporation induces local upward waterand solute fluxes in soils, causing soil salinization and rise of contaminants to the soilsurface, and influencing the migration of solutes to the groundwater. It is known thatsoil heterogeneity strongly controls transport under infiltration conditions, but itseffect on transport under upward flow conditions has barely been investigated. In thisthesis, laboratory tracer experiments were conducted in artificial porous media withknown heterogeneity under evaporation conditions and observations were comparedwith numerical simulations in order to improve the understanding of upward flowand transport processes...