摘要
水势反映土壤水的能态 ,而水势梯度则是决定水流方向和速度的重要因素。本文主要介绍非饱和水通过以黄土 (细颗粒 )和石英砂 (粗颗粒 )组成的双层孔隙介质渗流的水势分布和变化的实验方法和主要实验结果 ,用以进一步分析解释以前工作中观察到的非饱和水在双层孔隙介质中的绕流现象。实验结果表明 :在喷水强度一定情况下 ,石英砂层中的水势随石英砂层厚度的增加而减小 ;在石英砂层厚度一定情况下 ,石英砂层中的水势随喷水强度的增加而增大 ;石英砂层上方的水部分通过石英砂层向下流动 ,部分绕过石英砂层向下流动 ;绕过石英砂层的水部分地紧贴石英砂层下表面向石英砂层下方的黄土中流动。
Water potential reflects energy level of soil water and the gradient of water potential is an impotent factor describing direction and velocity of water flow.The main experimental methods and results of determining water potential distribution and variation for unsaturated water vadose passing through two-layer porous media made of loess (fine particle) and quartz sand(coarse particle)are introduced in this paper in order to analyze and explain further detouring flow phenomenon observed in former work.It can be seen from the results that:water potential in quartz sand layer decreases with increasing thickness of the quartz sand layer under fixed sprinkling rate and increases with increasing sprinkling rate under fixed thickness of quartz sand layer;some of water above quartz sand layer flows down through the quartz sand layer and some flows down along edges of the quartz sand layer;some of water detoured the quartz sand layer flows into the region below the quartz sand layer closely along lower surface of the quartz sand layer.These are some phenomena to be worthing further study. (
出处
《辐射防护》
CAS
CSCD
北大核心
2004年第6期356-363,共8页
Radiation Protection
