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使用积分法估算原状土van Genuchten模型参数
作者姓名:HAN Xiang-Wei  SHAO Ming-An  R. HORTON
作者单位:[1]Arid Land Research Center, Tottori University, Hamasaka Tottori, 1390, 680001 (Japan) [2]State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Northwest A&F University, Yangling 712100 (China) [3]Department of Agronomy, Iowa State University, Ames, Iowa 50011 (USA)
基金项目:Project supported by the International Partnership Program for Creative Research Teams of the Chinese Academy of Sciences (CAS) & the State Administration of Foreign Experts Affairs (SAFEA), China, and the Hundreds-Talent Program of the Chinese Academy of Sciences, China (No. 90502006)
摘    要:The van Genuchten model is the most widely used soil water retention curve (SWRC) model. Two undisturbed soils (clay and loam) were used to evaluate the accuracy of the integral method to estimate van Genuchten model parameters and to determine SWRCs of undisturbed soils. SWRCs calculated by the integral method were compared with those measured by a high speed centrifuge technique. The accuracy of the calculated results was evaluated graphically, as well as by root mean square error (RMSE), normalized root mean square error (NRMSE) and Willmott’s index of agreement (l). The results obtained from the integral method were quite similar to those by the centrifuge technique. The RMSEs (4.61 × 10-5 for Eum-Orthic Anthrosol and 2.74 × 10-4 for Los-Orthic Entisol) and NRMSEs (1.56 × 10-4 for Eum-Orthic Anthrosol and 1.45 × 10-3 for Los-Orthic Entisol) were relatively small. The l values were 0.973 and 0.943 for Eum-Orthic Anthrosol and Los-Orthic Entisol, respectively, indicating a good agreement between the integral method values and the centrifuge values. Therefore, the integral method could be used to estimate SWRCs of undisturbed clay and loam soils.

关 键 词:模型参数  积分方法  精度估计  土壤水分特征曲线  Genuchten模型  原状土  高速离心机  均方根误差
收稿时间:18 April 2009

Estimating van Genuchten model parameters of undisturbed soils using an integral method
HAN Xiang-Wei,SHAO Ming-An,R. HORTON.Estimating van Genuchten model parameters of undisturbed soils using an integral method[J].Pedosphere,2010,20(1):55-62.
Authors:HAN Xiang-Wei  SHAO Ming-An and R HORTON
Institution:Arid Land Research Center, Tottori University, Hamasaka Tottori, 1390, 680001 (Japan);State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Northwest A&F Univ;State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Northwest A&F University, Yangling 712100 (China);Department of Agronomy, Iowa State University, Ames, Iowa 50011 (USA)
Abstract:The van Genuchten model is the most widely used soil water retention curve (SWRC) model. Two undisturbed soils (clay and loam) were used to evaluate the accuracy of the integral method to estimate van Genuchten model parameters and to determine SWRCs of undisturbed soils. SWRCs calculated by the integral method were compared with those measured by a high speed centrifuge technique. The accuracy of the calculated results was evaluated graphically, as well as by root mean square error (RMSE), normalized root ...
Keywords:horizontal infiltration  normalized root mean square error (NRMSE)  root mean square error (RMSE)  water retention  Willmott's index
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