Comparing decision tree and instance-based learning models to estimate soil saturated hydraulic conductivity

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FARZADMEHR M.; DASTOURANI M.; KHASHEI SIUKI A.

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Journal: Journal of Water and Soil Conservation Year:2019 | Volume:25 | Issue:5 Page(s): 167-184

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Title

Comparing decision tree and instance-based learning models to estimate soil saturated hydraulic conductivity

Author(s)

FARZADMEHR M. | DASTOURANI M. | KHASHEI SIUKI A. | Issue Writer Certificate

Keywords

Gamma testQ2

IBk algorithmQ1

M5P algorithmQ1

Abstract

Background and Objectives: Soil saturated hydraulic conductivity is one of the most important physical characteristics of soils which affects water movement in soil. Knowledge of this parameter can help to understand and solve environmental problems. However, measurement of this parameter by direct laboratory and field methods is hard, time consuming and expensive. Thus, there is need to use alternative methods based on conveniently available soil properties to estimate it with less effort, time and cost. Nonparametric methods are new indirect methods to estimate hydraulic properties of soil, including soil saturated hydraulic conductivity (ks). The aim of this study was to use two methods such as M5P decision tree and an IBk instance-based learning method, which is a classifier with k nearest neighbors to estimate ks from conveniently available properties of soil. Materials and Methods: In this study a dataset of 151 soil samples which was collected from a site in Bojnord province was used. Conveniently available soil properties includig sand, silt and clay percentage, bulk density, particle density, EC, OC, TNV, saturated moisture and pH. Saturated hydraulic conductivity was measured with the Guelph permeameter. The Gamma test was used to determine important parameters for predicting and the modeling procedure of ks. Then, various combinations of parameters of the data set were compared to each other based on their Gamma value, to determine the optimum combination of parameters for modeling ks. Using the optimum combination which had the least Gamma value, the M5P decision tree and the IBk instance-based learning methods were performed. To improve the IBk, two different distance weighting systems were used. Finally, evaluation statistics of each model including R2, RMSE, MAE and MAPE were calculated. Results: The optimum combination determined by the Gamma test which was then used for modeling, included sand, silt and clay percent, TNV percent, EC and bulk density. The tree selected bulk density as the most important discriminative parameter and constructed 3 linear equations for predicting ks, based on the bulk density value. Evaluation criteria calculated for this model with RMSE= 23. 89 cm/d and MAPE= 20. 50% didn’ t predict ks accurately. Different weighting systems didn’ t improve IBk performance. Also, the IBk model with RMSE=31. 23 cm/d and MAPE=23. 24% didn't estimate ks accurately. Conclusion: The decision tree model performed better than the instance-based learning model to estimate ks. Also, the tree showed some information about the structure of the studied soil.

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APA: Copy

FARZADMEHR, M., DASTOURANI, M., & KHASHEI SIUKI, A.. (2019). Comparing decision tree and instance-based learning models to estimate soil saturated hydraulic conductivity. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 25(5 ), 167-184. SID. https://sid.ir/paper/156281/en

Vancouver: Copy

FARZADMEHR M., DASTOURANI M., KHASHEI SIUKI A.. Comparing decision tree and instance-based learning models to estimate soil saturated hydraulic conductivity. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;25(5 ):167-184. Available from: https://sid.ir/paper/156281/en

IEEE: Copy

M. FARZADMEHR, M. DASTOURANI, and A. KHASHEI SIUKI, “Comparing decision tree and instance-based learning models to estimate soil saturated hydraulic conductivity,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 25, no. 5 , pp. 167–184, 2019, [Online]. Available: https://sid.ir/paper/156281/en

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