Experimental investigation on rainfall infiltration and solute transport in layered porous and fractured media

作     者：Hui-fang Wang Ming-yu Wang 

作者机构：Center for Water System Security & Key Laboratory of Computational Geodynamics Graduate University of Chinese Academy of Sciences Beijing China 

出 版 物：《Journal of Coal Science & Engineering(China)》 (煤炭学报（英文版）)

年 卷 期：2012年第18卷第1期

页      面：29-34页

学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程] 0835[工学-软件工程] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Supported by ihe Major State Basic Research Development Program of China (973 Program) (2010CB428801, 2010CB428804) the National Science Foundation of China (40972166) the Major Science and Technology Program for Water Pollution Control and Treatment (2009ZX07212-003) the Technology Development and Applications for Ecology System Reconstruction and Restoration of Yongding River (D08040903700000) 

主　　题：rainfall infiltration solute transport layered porous and fractured media lab experiment breakthrough curves 

摘      要：Layered structures with upper porous and lower fractured media are widely distributed in the world. An experimen- tal investigation on rainfall infiltration and solute transport in such layered structures can provide the necessary foundation for effectively preventing and forecasting water bursting in mines, controlling contamination of mine water, and accomplishing ecological restoration of mining areas. A typical physical model of the layered structures with porous and fractured media was created in this study. Then rainfall infiltration experiments were conducted after salt solution was sprayed on the surface of the layered structure. The volumetric water content and concentration of chlorine ions at different specified positions along the profile of the experiment system were measured in real-time. The experimental results showed that the lower fractured media, with a considerably higher permeability than that of the upper porous media, had significant effects on preventing water infil- tration. Moreover, although the porous media were homogeneous statistically in the whole domain, spatial variations in the features of effluent concentrations with regards to time, or so called breakthrough curves, at various sampling points located at the horizontal plane in the porous media near the porous-fractured interface were observed, indicating the diversity of solute transport at small scales. Furthermore, the breakthrough curves of the outflow at the bottom, located beneath the underlying fractured rock, were able to capture and integrate features of the breakthrough curves of both the upper porous and fractured media, which exhibited multiple peaks, while the peak values were reduced one by one with time.