Unified Solution for Infiltration and Drainage with Hysteresis Theory and Field Test

摘要: Hysteresis has been found in both the hydraulic conductivity, K, vs. pressure head, ψ, relationship, and soil water content, θ, ψ relationship. This limits application of a unified solution for infiltration drainage. A Haines' Jump model hysteresis is proposed combined with Broadbridge White form K(θ) diffusivity, D, D(θ). allows analytical accounts by allowing inverse macroscopic capillary length scale, α, to be hysteretic. method priori estimating hysteretic nature α tested. The change can estimated from other θ(ψ) models then used combination functions. predicted was similar that obtained procedures. applied field-measured storage during Neglecting resulted poor prediction drainage based on parameters infiltration. especially true high initial content. Incorporating error less than measurement error. In addition, single procedure measurements now developed.