湿润区含水率随土壤深度变化的Green-Ampt模型研究  

Study on Green-Ampt Model of Soil Moisture Changes with Depth in Wet Area

作　　者：张丁[1] 黄英[1] 何金龙 

机构地区：[1]昆明理工大学,昆明650500 [2]华能澜沧江水电股份有限公司,昆明650214

出　　处：《灌溉排水学报》2016年第12期60-66,共7页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51168022;51568031;51269006);云南应用基础研究计划重点项目(2013FA033);昆明理工大学分析测试基金项目(2013205003)

摘　　要：针对原始Green-Ampt模型假定土壤入渗湿润区处于饱和含水率状态而忽略了非饱和区含水率存在的实际问题,提出将原始Green-Ampt入渗模型和土壤持水Van Genuchten模型结合起来,考虑土壤入渗过程中湿润区含水率随深度的变化,改进并建立了矩形与1/4椭圆组合简化Green-Ampt模型和梯形简化Green-Ampt模型,并用实例进行了验证。结果表明,与实测值相比,考虑土壤湿润区含水率随深度变化的Green-Ampt改进模型优于原始Green-Ampt模型;入渗时间较短时,矩形与1/4椭圆组合简化模型优于梯形简化模型;入渗时间较长时,梯形简化模型优于矩形与1/4椭圆组合简化模型;3种模型计算累积入渗量的精度高于计算入渗速率的精度。A Rectangular combined with 1/4 Oval Simplified Green-Ampt model and a Trapezoidal Simplified model were established and verified, based on the combination of the original Green-Amptinfiltration model and the soil moisture Van Genuchten model and the consideration of moisture changes in wet area with depth during the infiltration process, by experiments against the hypothesis of the original Green-Ampt model that the soil was saturated in wet area and ignores that the soil moisture was different in unsaturated area. The result showed that, compared with the experimental value, the improved Green-Ampt models which considered the soilwet moisture changes with depth were better than the original one. The Rectangular combined with I/4 Oval Simpli- fied Green-Ampt model was superior to the Trapezoidal Simplified model with shorter infiltration history and in the case of long infiltration history, there would be a contrary result in all three models, the accuracy of accumu- lated infiltration was higher than that of seeping rate.

关 键 词：GREEN-AMPT入渗模型 土壤湿润区含水率 矩形与1/4椭圆组合简化Green-Ampt模型 梯形简化Green-Ampt模型 模型验证 

分 类 号：S152.7[农业科学—土壤学]