Scale- and rate-dependent solute transport within an unsaturated sandy monolith

摘要: Solute transport in unsaturated soil is a scale- and flow rate-dependent process, high quality experimental studies are needed to introduce scaling relationships the governing models. Within this paper, we present an study characterize solute for undisturbed subsoil monolith sampled sandy aquifer. Leaching experiments were performed at different rates, breakthrough positions was measured by time domain reflectometry (TDR) probes. At TDR probe scale, assessed as being convective-dispersive process with mixing lengths 1 m. bottom of monolith, meso-scale dispersivity least two times larger than local-scale dispersivity. In addition, can be successfully predicted using stream tube model combination local scale process. Important effects also observed relationship between square coefficient variation velocities contrast previous studies, do not observe significant difference properties rates (from 1.05 54.16 cm d(-1)). We attribute insignificance either balance decrease tortuosity increase velocity rate or non-dependency both terms on rate.