Estimating longitudinal dispersion coefficient in natural streams using empirical models and machine learning algorithms

  • The longitudinal dispersion coefficient (LDC) plays an important role in modeling the transport of pollutants and sediment in natural rivers. As a result of transportation processes, the concentration of pollutants changes along the river. Various studies have been conducted to provide simple equations for estimating LDC. In this study, machine learning methods, namely support vector regression,The longitudinal dispersion coefficient (LDC) plays an important role in modeling the transport of pollutants and sediment in natural rivers. As a result of transportation processes, the concentration of pollutants changes along the river. Various studies have been conducted to provide simple equations for estimating LDC. In this study, machine learning methods, namely support vector regression, Gaussian process regression, M5 model tree (M5P) and random forest, and multiple linear regression were examined in predicting the LDC in natural streams. Data sets from 60 rivers around the world with different hydraulic and geometric features were gathered to develop models for LDC estimation. Statistical criteria, including correlation coefficient (CC), root mean squared error (RMSE) and mean absolute error (MAE), were used to scrutinize the models. The LDC values estimated by these models were compared with the corresponding results of common empirical models. The Taylor chart was used to evaluate the models and the results showed that among the machine learning models, M5P had superior performance, with CC of 0.823, RMSE of 454.9 and MAE of 380.9. The model of Sahay and Dutta, with CC of 0.795, RMSE of 460.7 and MAE of 306.1, gave more precise results than the other empirical models. The main advantage of M5P models is their ability to provide practical formulae. In conclusion, the results proved that the developed M5P model with simple formulations was superior to other machine learning models and empirical models; therefore, it can be used as a proper tool for estimating the LDC in rivers.show moreshow less

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Metadaten
Document Type:Article
Author: Katayoun Kargar, Saeed Samadianfard, Javad Parsa, Narjes Nabipour, Shahaboddin ShamshirbandORCiD, PhD Amir MosaviORCiD, Kwok-wing Chau
DOI (Cite-Link):https://doi.org/10.1080/19942060.2020.1712260Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20200128-40775Cite-Link
URL:https://www.tandfonline.com/doi/full/10.1080/19942060.2020.1712260
Parent Title (English):Engineering Applications of Computational Fluid Mechanics
Publisher:Taylor & Francis
Language:English
Date of Publication (online):2020/01/24
Date of first Publication:2020/01/24
Release Date:2020/01/28
Publishing Institution:Bauhaus-Universität Weimar
Institutes:Fakultät Bauingenieurwesen / Institut für Strukturmechanik
Volume:2020
Issue:Volume 14, No. 1
Pagenumber:12
First Page:311
Last Page:322
Tag:Gaussian process regression; M5 model tree; longitudinal dispersion coefficient; random forest; rivers; support vector regression
GND Keyword:Maschinelles Lernen
Dewey Decimal Classification:000 Informatik, Informationswissenschaft, allgemeine Werke
BKL-Classification:54 Informatik
Licence (German):License Logo Creative Commons 4.0 - Namensnennung (CC BY 4.0)