土壤优先流的离子显色示踪技术和分形模型模拟方法研究.pdf

Journal of Water Resources Research 水资源研究, 2012, 1, 78-84 doi:10.4236/jwrr.2012.13012 Published Online June 2012 (/journal/jwrr.html) Characterizing Preferential Flow Using Iodine-Starch * Staining Method and Active Region Model 1 2 3 Feng Sheng , Kang Wang , Renduo Zhang 1School of Hydraulic Engineering, Changsha University of Science Technology, Changsha 2 State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 3School of Environmental Science and Engineering, Zhongshan University, Guangzhou Email: fsaint8586@163.com Received: May 4th st th , 2012; revised: May 21 , 2012; accepted: May 29 , 2012 Abstract: To capture the heterogeneous flow pattern and enhance the prediction accuracy of preferential flow in unsaturated soil, the iodine-starch staining method was applied to visualize the preferential flow pattern from the background in this research. The digital imaging procedure was conducted to obtain the heteroge- neous distribution pattern of preferential flow paths, and soil sampling was conducted to obtain the heteroge- neous distributions of soil water content and solute concentration in the preferential flow region. The meas- ured distributions of soil water content and solute concentration resulted from preferential flow were simu- lated and predicted using the active region model (ARM) and the mobile-immobile region model (MIM). The modeling efficiency using ARM and MIM were quantitatively evaluated and compared using th