Journal
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
Volume 15, Issue 1, Pages 1298-1320Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19942060.2021.1972043
Keywords
Longitudinal dispersion coefficient; Gaussian processes regression; automated machine learning; natural streams
Funding
- Deanship of Scientific Research at King Khalid University [RGP 1/372/42]
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This study presents a new hybrid machine learning model for estimating the longitudinal dispersion coefficient in natural streams, which outperforms traditional models in terms of stability and accuracy. The feature selection approach identified key parameters affecting dispersion coefficient, leading to excellent modeling performance in terms of accuracy.
Among several indicators for river engineering sustainability, the longitudinal dispersion coefficient (K-x) is the main parameter that defines the transport of pollutants in natural streams. Accurate estimation of K-x has been challenging for hydrologists due to the high stochasticity and non-linearity of this hydraulic-environmental parameter. This study presents a new hybrid machine learning (ML) model integrating a Gaussian Process Regression (GPR) and an evolutionary feature selection (FS) approach (i.e. Covariance Matrix Adaptation Evolution Strategy (CMAES)) to estimate K-x in natural streams. The dataset consists of geometric and hydraulic river system parameters from 29 streams in the United States. The modeling results showed that the proposed model outperformed other models in the literature, producing more stable and accurate estimations. The FS approach evidenced the significance of the cross-sectional average flow velocity (U), channel width (B), and channel sinuosity sigma to estimate the dispersion coefficient. In quantitative terms, the integrated GPR model with feature selection approach attained the minimum root mean square error (RMSE = 48.67) and maximum coefficient of determination (R-2 = 0.95 ). The proposed hybrid evolutionary ML model arises as robust, flexible and reliable alternative computer aid technology for predicting the longitudinal dispersion coefficient in natural streams.
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