水科学进展2012，Vol.23Issue(1)：59-66,8.DOI:32.1309.P.20120104.2012.006
基于分层假设的Green-Ampt模型改进
Modification of Green-Ampt model based on the stratification hypothesis
摘要
Abstract
A modification of Green-Ampt model is proposed based on the stratification hypothesis, which dynamically divided the soil column is into saturated layer, transient layer and dry layer. The model uses the concept of an equivalent hydraulic conductivity in the saturated layer, and employs a new method to estimate the Green Ampt wetting front suction. The Richards equation is used to simulate the soil water movement through all three layers, and to study the properties of soil layers including the thickness, the soil water content, and the hydraulic conductivity. The results show that the ratio of the transient layer to the saturated layer decreases linearly as the soil profile becomes wetter. Moreover, the ponding depth and the profile of initial soil water content influence the interception and the slope of the linear relationship. However, the saturated hydraulic conductivity is found to have no measureable influence on the relationship. The soil water content in the transition layer follows an elliptical distribution, and the hydraulic conductivity decreases linearly with the increase of the soil depth in the layer. The infiltration process can be better simulated by the modified Green-Ampt model.关键词
分层假设/等效导水率/Green-Ampt模型Key words
stratification hypothesis/ equivalent hydraulic conductivity/ Green-Ampt model分类
建筑与水利引用本文复制引用
彭振阳,黄介生,伍靖伟,郭会..基于分层假设的Green-Ampt模型改进[J].水科学进展,2012,23(1):59-66,8.基金项目
高等学校博士学科点专项科研基金资助项目(200804860026) （200804860026）
中央高校基本科研业务经费专项资金资助项目(20102060201000065) （20102060201000065）
