Estimation of surface shear strength in Zagros region of Iran — A comparison of artificial neural networks and multiple-linear regression models
Modeling soil erosion and runoff requires accurate estimates of surface soil shear strength. In this study, the use of artificial neural networks (ANNs) in estimating soil shear strength from measured particle size distribution, topographic attributes, normalized difference vegetation index (NDVI),...
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| Published in: | Geoderma Vol. 153; no. 1; pp. 29 - 36 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier B.V
15-10-2009
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| Abstract | Modeling soil erosion and runoff requires accurate estimates of surface soil shear strength. In this study, the use of artificial neural networks (ANNs) in estimating soil shear strength from measured particle size distribution, topographic attributes, normalized difference vegetation index (NDVI), soil organic carbon (SOC), and CaCO
3 were investigated. Three neural networks structures: multilayer perceptron (MLP), generalized feed-forward, and modular feed-forward networks were used and compared with conventional multiple-linear regression analysis. Improvements were achieved with all three neural network models over a conventional multiple-linear regression (MLR) models. Estimation model 1 of soil shear strength included particles size distribution, CaCO
3 and SOC; in model 2 particles size distribution, topographic attributes and NDVI were used; and in model 3 combination of model 1 and 2 as independent variables were used. The performances of the models were evaluated using Spearman's correlation coefficient (
r) between the observed and the estimated values, normalized mean square error (NMSE), and mean absolute error (MAE). The performance of MLP as compared to other ANN structures was significantly better (
p
>
0.05).
Model 3 (ANNs and regression) performed insignificantly better than model 2 (ANNs and regression) but model 2 and model 3 (ANNs and regression) were significantly different from model 1 (ANNs and regression). Slope and vegetation attributes were found to be the most sensitive variables to estimate surface soil shear strength in Zagros region of Iran. |
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| AbstractList | Modeling soil erosion and runoff requires accurate estimates of surface soil shear strength. In this study, the use of artificial neural networks (ANNs) in estimating soil shear strength from measured particle size distribution, topographic attributes, normalized difference vegetation index (NDVI), soil organic carbon (SOC), and CaCO
3 were investigated. Three neural networks structures: multilayer perceptron (MLP), generalized feed-forward, and modular feed-forward networks were used and compared with conventional multiple-linear regression analysis. Improvements were achieved with all three neural network models over a conventional multiple-linear regression (MLR) models. Estimation model 1 of soil shear strength included particles size distribution, CaCO
3 and SOC; in model 2 particles size distribution, topographic attributes and NDVI were used; and in model 3 combination of model 1 and 2 as independent variables were used. The performances of the models were evaluated using Spearman's correlation coefficient (
r) between the observed and the estimated values, normalized mean square error (NMSE), and mean absolute error (MAE). The performance of MLP as compared to other ANN structures was significantly better (
p
>
0.05).
Model 3 (ANNs and regression) performed insignificantly better than model 2 (ANNs and regression) but model 2 and model 3 (ANNs and regression) were significantly different from model 1 (ANNs and regression). Slope and vegetation attributes were found to be the most sensitive variables to estimate surface soil shear strength in Zagros region of Iran. |
| Author | Afyuni, M. Khalilmoghadam, B. Abbaspour, K.C. Jalalian, A. Dehghani, A.A. Schulin, R. |
| Author_xml | – sequence: 1 givenname: B. surname: Khalilmoghadam fullname: Khalilmoghadam, B. email: moghaddam623@yahoo.ie organization: Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran – sequence: 2 givenname: M. surname: Afyuni fullname: Afyuni, M. organization: Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran – sequence: 3 givenname: K.C. surname: Abbaspour fullname: Abbaspour, K.C. organization: Eawag, Swiss Federal Institute for Aquatic Science and Technology, Ueberlandstr 133, 8600 Dübendorf, Switzerland – sequence: 4 givenname: A. surname: Jalalian fullname: Jalalian, A. organization: Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran – sequence: 5 givenname: A.A. surname: Dehghani fullname: Dehghani, A.A. organization: Department of Water Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran – sequence: 6 givenname: R. surname: Schulin fullname: Schulin, R. organization: Institute of Terrestrial Ecology, ETH Zürich, Grabenstrasse 11a, 8952 Schlieren, Switzerland |
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| Keywords | Surface shear strength Soil erodibility Artificial neural network |
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| Title | Estimation of surface shear strength in Zagros region of Iran — A comparison of artificial neural networks and multiple-linear regression models |
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