湿润区含水率随土壤深度变化的Green-Ampt模型研究
|
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 1/4 Oval Simplified 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 accumulated infiltration was higher than that of seeping rate.
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 1/4 Oval Simplified 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 accumulated infiltration was higher than that of seeping rate.
引文
[1]樊贵盛,李尧,苏冬阳,等.大田原生盐碱荒地入渗特性的试验[J].农业工程学报,2012,28(19):63-70.
[2]李雪转.非充分供水土壤水分入渗规律的试验研究与过程模拟[D].太原:太原理工大学,2010.
[3]郝春红,潘英华,陈曦,等.坡度、雨强对塿土入渗特征的影响研究[J].土壤通报,2011,42(5):1 040-1 044.
[4]GREEN W H,AMPT G A.Studies on soil physics:I Flow of air and water through soils[J].Journal of Agricultural Science,1 911,4(1):1-24.
[5]PHILIP J R.The theory of infiltration:1.The infiltration equation and its solution[J].Soil Science,1957,83(5):345-357.
[6]KOSTIAKOV A N.On the dynamics of the coefficient of water percolation in soils and on the necessity of studying it from a dynamic point of view for purposes of amelioration[C].Moscow:Transactions Communication International Society Soil Science 6th,1932:17-21.
[7]HORTON R E.An approach toward a physical interpretation of infiltration-capacity[J].Soil Science Society of America Journal,1941,(5):399-417.
[8]MEIN RG.Larson C L Modeling infiltration during a steady rain[J].Water Resources Research,1973,9(2):384-394.
[9]CHU S T.Infiltration during an unsteady rain[J].Water Resources Research.1978,14(3):461-466.
[10]CHEN L,YOUNG M H.Green-Ampt infiltration model for sloping surfaces[J].Water Resources Research,2006,42(7):1-9.
[11]郭向红,孙西欢,马娟娟,等.不同入渗水头条件下的Green-Ampt模型[J].农业工程学报,2010,26(3):64-68.
[12]刘继龙,马孝义,张振华,等.不同条件下Green-Ampt模型累积入渗量显函数的适用性[J].应用基础与工程科学学报,2010,18(1):11-19.
[13]王文焰,汪志荣,王全九,等.黄土中Green-Ampt入渗模型的改进与验证[J].水利学报,2003(5):30-34.
[14]彭振阳,黄介生,伍靖伟,等.基于分层假设的Green-Ampt模型改进[J].水科学进展,2012,23(1):59-66.
[15]VAN GENUCHTEN M TH.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44:892-898.
[16]杨改强,霍丽娟,杨国义,等.利用MATLAB拟合van Genuchten方程参数的研究[J].土壤,2010,42(2):268-274.
[17]肖建英,李永涛,王丽,等.利用Van Genuchten模型拟合土壤水分特征曲线[J].地下水,2007,29(5):46-47.
[18]张杰,韩同春,豆红强,等.基于分层假定入渗模型的边坡安全性分析[J].中南大学学报(自然科学版),2014,45(9):3 211-3 218.
[2]李雪转.非充分供水土壤水分入渗规律的试验研究与过程模拟[D].太原:太原理工大学,2010.
[3]郝春红,潘英华,陈曦,等.坡度、雨强对塿土入渗特征的影响研究[J].土壤通报,2011,42(5):1 040-1 044.
[4]GREEN W H,AMPT G A.Studies on soil physics:I Flow of air and water through soils[J].Journal of Agricultural Science,1 911,4(1):1-24.
[5]PHILIP J R.The theory of infiltration:1.The infiltration equation and its solution[J].Soil Science,1957,83(5):345-357.
[6]KOSTIAKOV A N.On the dynamics of the coefficient of water percolation in soils and on the necessity of studying it from a dynamic point of view for purposes of amelioration[C].Moscow:Transactions Communication International Society Soil Science 6th,1932:17-21.
[7]HORTON R E.An approach toward a physical interpretation of infiltration-capacity[J].Soil Science Society of America Journal,1941,(5):399-417.
[8]MEIN RG.Larson C L Modeling infiltration during a steady rain[J].Water Resources Research,1973,9(2):384-394.
[9]CHU S T.Infiltration during an unsteady rain[J].Water Resources Research.1978,14(3):461-466.
[10]CHEN L,YOUNG M H.Green-Ampt infiltration model for sloping surfaces[J].Water Resources Research,2006,42(7):1-9.
[11]郭向红,孙西欢,马娟娟,等.不同入渗水头条件下的Green-Ampt模型[J].农业工程学报,2010,26(3):64-68.
[12]刘继龙,马孝义,张振华,等.不同条件下Green-Ampt模型累积入渗量显函数的适用性[J].应用基础与工程科学学报,2010,18(1):11-19.
[13]王文焰,汪志荣,王全九,等.黄土中Green-Ampt入渗模型的改进与验证[J].水利学报,2003(5):30-34.
[14]彭振阳,黄介生,伍靖伟,等.基于分层假设的Green-Ampt模型改进[J].水科学进展,2012,23(1):59-66.
[15]VAN GENUCHTEN M TH.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44:892-898.
[16]杨改强,霍丽娟,杨国义,等.利用MATLAB拟合van Genuchten方程参数的研究[J].土壤,2010,42(2):268-274.
[17]肖建英,李永涛,王丽,等.利用Van Genuchten模型拟合土壤水分特征曲线[J].地下水,2007,29(5):46-47.
[18]张杰,韩同春,豆红强,等.基于分层假定入渗模型的边坡安全性分析[J].中南大学学报(自然科学版),2014,45(9):3 211-3 218.