Experimental And Simulation Study Of Reactive Solute Transport In A Single Fracture

It has basic theory significance to study reactive solute transport in rough single fracture for bedrock fracture water pollution prevention and control. However there are few literatures in its infancy. In this paper we design natural fractures and artificial fracture model on the basis of summarizing the predecessors’research. We carried out different apertures and velocities of aniline and 1,2-naphthoquinone-4-sodium sulfonate reactive solute transport experiments. We use ADE model to fit the solute transport breakthrough in rough fracture. The improved model of ADRE simulate rough fracture reactive solute transport. The main conclusions are as follows:(1) The experiments showed that the hydraulic gradient and flow velocity is a nonlinear relationship in rough fractures. The forchheimer equation fits better than the traditional Darcy’s law.(2) When using the traditional ADE model of solute transport simulation overall fitting precision is higher, But to capture the phenomenon of early or trailing effect is poorer. It may be due to rough fracture media block or crack in the face of solute adsorption.(3) The improved ADRE model can well simulate reactive solute transport under different flows in fractures and the peak concentrations of relative error are lesser by simulation, The simulation accuracy is high. It shows the improved ADRE model is feasible(4) When the reactive solute transport experiment was carried out, The improved ADRE model is feasible and fitting precision. The model parameter D increases with the increase of flow rate, The model parameter m decreases with increasing seepage flow, The model parameter β0 increases with the increase of flow rate, The mechanism needs further study.