ROSETTA: a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer functions
ROSETTA: a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer functions
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DOI：
10.1016/s0022-1694(01)00466-8
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发表时间：
2001-10-01
影响因子：
6.4
通讯作者：
van Genuchten, MT
中科院分区：
文献类型：
--
作者：
Schaap, MG;Leij, FJ;van Genuchten, MT
土壤水力特性对于许多水和溶质运移的研究是必要的，但由于实际和/或财政限制，往往无法测量。我们描述了一个计算机程序，ROSETTA，它实现了五个层次土壤传递函数（ptf），用于估计保水率，以及饱和和不饱和的水力导电性。ptf中的层次结构允许使用有限的（仅限纹理类）到更扩展的（纹理、体积密度和一个或两个保水点）输入数据来估计van Genuchten保水参数和饱和水力导电性。ROSETTA是基于神经网络分析与自举法相结合，从而允许程序提供预测的水力参数的不确定性估计。ROSETTA的总体性能用决定系数和均方根误差（rmse）来表征。当使用更多预测因子时，水潴留的RMSE值从0.078下降到0.044 cm(3) cm（-3）。饱和电导率的RMSE同样从0.739下降到0.647（无量纲对数（10）单位）。不饱和电导率的RMSE值介于0.79和1.06之间，这取决于是否使用测量或估计的保留参数作为预测因子。计算的平均误差表明，PTFs低估了相对高吸力下的保水率和非饱和导电性。当没有水力数据可用时，ROSETTA的不确定性估计可以作为模型可靠性的指示。ROSETTA项目带有一个图形用户界面，允许用户友好地访问ptf，可以从美国盐度实验室网站：http://www.ussl.ars.usda.gov/下载。(C) 2001 Elsevier Science B.V.版权所有
Soil hydraulic properties are necessary for many studies of water and solute transport but often cannot be measured because of practical and/or financial constraints. We describe a computer program, ROSETTA, which implements five hierarchical pedotransfer functions (PTFs) for the estimation of water retention, and the saturated and unsaturated hydraulic conductivity. The hierarchy in PTFs allows the estimation of van Genuchten water retention parameters and the saturated hydraulic conductivity using limited (textural classes only) to more extended (texture, bulk density, and one or two water retention points) input data. ROSETTA is based on neural network analyses combined with the bootstrap method, thus allowing the program to provide uncertainty estimates of the predicted hydraulic parameters. The general performance Of ROSETTA was characterized with coefficients of determination, and root mean square errors (RMSEs). The RMSE values decreased from 0.078 to 0.044 cm(3) cm(-3) for water retention when more predictors were used. The RMSE for the saturated conductivity similarly decreased from 0.739 to 0.647 (dimensionless log(10) units). The RMSE values for unsaturated conductivity ranged between 0.79 and 1.06, depending on whether measured or estimated retention parameters were used as predictors. Calculated mean errors showed that the PTFs underestimated water retention and the unsaturated hydraulic conductivity at relatively high suctions. ROSETTA's uncertainty estimates can be used as an indication of model reliability when no hydraulic data are available. The ROSETTA program comes with a graphical user interface that allows user-friendly access to the PTFs, and can be downloaded from the US Salinity Laboratory website: http://www.ussl.ars.usda.gov/. (C) 2001 Elsevier Science B.V. All rights reserved.