Impact of rainfall intensity on the transport of two herbicides in undisturbed grassed filter strip soil cores

A review of model applications for structured soils: a) Water flow and tracer transport

“…Similar observations were made also by Pot et al (2005), who needed increasingly complex models (from CDE, MIM, to DP-MIM; all as part of HYDRUS-1D) to describe tracer displacement column experiments for increasing fluxes and saturations, and by Schwartz et al (2000), who could describe tracer breakthrough at −10 cm pressure head using the CDE, while at −5 and 0 cm the fit improved when using a DPM.…”

Consequences of varied soil hydraulic and meteorological complexity on unsaturated zone time lag estimates

“…Furthermore, meteorology and rainfall intensity were shown to play a critical role in determining the rate and nature of solute movement and eventual recharge to groundwater and hence, should be accounted for in numerical models (e.g. Torres et al,1998;Misstear, 2000;Pot et al, 2005;Schulte et al, 2006;Baily et al, 2011;Keim et al, 2012;Kramers et al, 2012;Fenton et al, 2013;Gladnyeva and Saifadeen 2013;Huebsch et al, 2013;Jahangir et al, 2013). By increasing time-step, the user essentially averages precipitation over a greater duration, which poorly reflects the intensity of the event and consequently results in errors in model outputs.…”

Simulating nonequilibrium movement of water, solutes and particles using hydrus - a review of recent applications

“…A version of HYDRUS-1D that considers Gerke and van Genuchten's (1993) dual-permeability flow and transport model was used in the studies of Šimůnek et al (2001), Zhang et al (2004), Köhne et al (2004bKöhne et al ( , 2006b, c), Pot et al (2005), Dousset et al (2007) and Kodešová et al (2006aKodešová et al ( , b, 2008, among many others. Zhang et al (2004) used the dual-permeability model to analyze solute and colloidal tracer tests in laboratory columns that examined the hydraulic properties of a foamed zeolite/iron pellet material that was developed for in situ remediation of contaminated groundwater.…”

“…Forward modeling with the dualpermeability dual-porosity model suggested that the preferential flow porosity will drastically lower contaminant removal efficiency. Pot et al (2005) used all physical nonequilibrium models from HYDRUS-1D to evaluate laboratory column studies under unsaturated steady-state flow conditions generated using several rainfall intensities. Pot et al (2005) needed increasingly complex models to describe tracer displacement column experiments for increasing fluxes.…”

“…Pot et al (2005) used all physical nonequilibrium models from HYDRUS-1D to evaluate laboratory column studies under unsaturated steady-state flow conditions generated using several rainfall intensities. Pot et al (2005) needed increasingly complex models to describe tracer displacement column experiments for increasing fluxes. Numerical analyses showed that contrasting physical nonequilibrium transport processes occurred for different fluxes.…”