渭河河床沉积物颗粒组成对渗透系数的影响  

Effect of Sediment Particle Composition on Vertical Hydraulic Conductivity of Weihe River Streambed

作　　者：张波[1] 宋进喜[1] 曹明明[1] 

机构地区：[1]西北大学城市与环境学院,陕西西安710127

出　　处：《水土保持通报》2013年第5期40-44,共5页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"典型物理化学作用下河床渗透系数变化机理研究"(51079123);教育部新世纪优秀人才支持计划项目"河水-地下水交错带中水量交换过程及其响应机理研究"(NCET-11-1045);教育部留学科研启动基金项目"渭河河床沉积物渗透系数变化特征及其响应机制"(教外司留[2010]1174)

摘　　要：正确认识河流沉积物颗粒组成与渗透系数之间的关系,对于准确测算河床渗透系数具有重要的意义。以渭河关中段为研究对象,采用水头下降竖管渗透实验法对渭河关中段4个河段的43个点位做渗透系数的原位测定,获取各点位的垂向渗透系数(Kv)值。对测定点的沉积物样品进行了粒度分析,并进一步分析了Kv与沉积物颗粒组成之间的相关关系。结果表明,垂向渗透系数与其沉积物的含砂量以及砂土与黏土含量比值均呈指数正相关,与黏土率呈指数负相关。研究获得的垂向渗透系数与沉积物颗粒组成的拟合方程为通过颗粒分析计算垂向渗透系数提供了依据。An understanding of the relationship between particle size composition and vertical hydraulic con ductivity（Kv） of streambed is of importance to estimate streambed Kv accurately. By taking the middle sec tion of the Weihe River as the research object, the Kv values of streambed were derived by a fallinghead standpipe permeameter test which was conducted at 43 locations of four sites along the river. Meanwhile, sediment samples in the locations were taken and particle size analysis of the samples was made. Then, the correlation between particle size composition and the Kv was analyzed. It can be concluded that the Kv had a positive correlation with sand content and the ratio of sand to clay particles in sediment, while they had a negative correlation with clay particles. The regression equation for the relationsh composition and the Kv can provide reference particle size analysis. for estimating the Kv of streambed in ip between particle size the Weihe River by the

关 键 词：河床沉积物 颗粒组成 垂向渗透系数 渭河 

分 类 号：P349[天文地球—水文科学]