Modification and discussion of the Green-Ampt model for an evolving wetting profile

被引：14

作者：

Zhang, Qiyong ^{[1
,2
]}

Chen, Wenwu ^{[1
,2
]}

Kong, Yuzhen ^{[3
]}

机构：

[1] Lanzhou Univ, Minist Educ, Key Lab Mech Disaster & Environm Western China, Lanzhou, Peoples R China

[2] Lanzhou Univ, Coll Civil Engn & Mech, Lanzhou, Peoples R China

[3] Lanzhou Univ, Sch Math & Stat, Lanzhou, Peoples R China

来源：

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES | 2020年 / 65卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Green-Ampt model; wetting front depth; quarter-ellipse profile; wetting profile; LAYERED SOILS; HYDRAULIC CONDUCTIVITY; INFILTRATION-MODEL; WATER; FLOW; PARAMETERS; AIR;

D O I：

10.1080/02626667.2020.1790567

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

The Green-Ampt (GA) model has been widely used to evaluate soil water infiltration. While a simple piston profile is commonly used, the wetting profile of a soil changes during infiltration and a quarter-ellipse has been found to better describe its evolution. This study aims to improve the GA model and discuss the model parameters when the quarter-ellipse profile is utilized. The soil column is divided into three zones: saturated, transient and dry. The variable gamma is introduced to express the ratio of the saturated zone depth to the wetting front depth. A modified GA model is derived via mathematical methods, but an exact solution is difficult to obtain. Therefore, a simplified (SGA) model is developed via a segmented method. Compared with the measured results, the SGA model is more accurate than the traditional model. Finally, the model parameters are discussed and a value of gamma = 0.5 is recommended.

引用

页码：2072 / 2082

页数：11

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