Laboratory experiments and dual‐domain modeling of infiltration dynamics in partially saturated fractured porous media

Many studies have shown that fracture networks can provide rapid pathways for water infiltration and time-dependent recharge in the vadose zone of consolidated fractured rock formations. To investigate control fracture–matrix interaction on preferential flow dynamics, we constructed a simple network system consisting m × 2 sandstone blocks placed between two glass plates. Water was injected from point source directly into with constant rate 1.5 g min−1. We used dual-porosity non-equilibrium model to discharge dynamics internal mass exchange observed strong deviations laboratory results when original parameterization used. This specifically concerns matrix–fracture volume ratio κ velocity v require modifications terms their definition underlying process description. Although assumes perfectly coupled matrix domain, experiments discrete nature led much stronger dominance domain hence reduction κ. The newly introduced parameter κ* includes additional effects processes related evolution smaller size interface. Furthermore, varying total vertical reveal convergence toward unique set existence representative elementary (REV) chosen setup. Though it performs less well very small systems below REV scale, describes sufficiently large high accuracy.