地下水浅埋深下的延迟给水实验研究  

Experiment on delayed gravity drainage in environment of shallow groundwater

作　　者：段吉波 王玉红[1] 米海存[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054

出　　处：《水资源与水工程学报》2014年第2期107-110,117,共5页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(41072184)

摘　　要：通过圆柱砂体排水实验来模拟潜水含水层的排水过程,分析了整个实验过程中给水度随水位埋深和时间的变化。实验结果表明:随着水位埋深的增大和随着排水时间的延长,给水度都逐渐增大。当排水实验从水位埋深为0 cm(砂表面)开始,水位稳定在15 cm时,给水度最大值为0.05;当排水实验从水位埋深为75 cm开始,水位稳定在90 cm时,给水度最大值为0.25。通过对Nachabe解析解公式验证,当水位埋深大于等于75 cm时,由该式计算的给水度值较为准确。A methodology for studying the unconfined aquifer drainage progress through the drainage experiment of the cylindrical sand is introduced. And it is used to discuss the variation of the specific yield with the depth to the water table and time during the experiment. The experiment result shows that the specific yield increases with the depth to the water table and the drainage time increasing. When the drainage experiment starts from the depth to the water table of 0 cm and ends at the stable water level of 15 cm,the maximum specific yield is 0. 05. When the drainage experiment starts from the depth to the water table of 75 cm and ends at the stable water level of 90 cm,the maximum specific yield is 0. 25. This study also shows that the value of the specific yield gets from the Nachabe empirical formula is more accurate when the depth to the water table is equal to or greater than 75 cm.

关 键 词：潜水含水层 排水实验 延迟给水 给水度 风积砂 

分 类 号：P641.2[天文地球—地质矿产勘探]