变水头入渗试验推求垂向渗透系数的计算方法  

Estimation of vertical hydraulic conductivity based on single-ring permeameter falling head infiltration experiment

作　　者：程勤波[1] 陈喜[1] 凌敏华[1] 魏玲娜[1] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《水科学进展》2010年第1期50-55,共6页Advances in Water Science

基　　金：国家自然科学基金资助项目(40930635;50679025);教育部科学技术研究重大项目(308012)~~

摘　　要：在Philip与Nestingen土壤水运动计算方法基础上,推导出描述单环变水头入渗试验中水深变化过程的计算公式,提出了确定土壤垂向渗透系数的MP方法。利用土壤非饱和数值模拟及室内土槽入渗试验得到的单环水位变化过程,验证了MP方法推求土壤垂向渗透系数的可靠性。结果表明:MP方法推求的土壤垂向渗透系数比目前采用的Philip方法、Nestingen方法及Green-Ampt方法精度更高,具有广泛的应用前景。Based on the Philip＇ s method and the Nestingen＇ s method for soil water infiltration computation, a new modified Philip （MP） method describing the variation of water depth in a single-ring permeameter is proposed for estimating vertical hydraulic conductivity. The MP method was validated on the basis of water depths in the single-ring permeameter from a numerical simulation and experiment results with in indoor troughs. The result indicates that the estimated vertical hydraulic conductivity using the MP method is more accurate than those of using the original Philip method, the Nestingen method, and the Green-Ampt method, which shows prospects for future applications.

关 键 词：单环变水头入渗 Green—Ampt方法 球缺扩散 垂向渗透系数 

分 类 号：TV139.16[水利工程—水力学及河流动力学]