Water Practice and Technology (Nov 2022)
Modeling of the oxygen aeration performance efficiency of gabion spillways
Abstract
The current paper discussed the application and comparison of machine learning algorithms such as the gradient boosting machine (GBM), neural network (NN), and deep neural network (DNN) in estimating the oxygen aeration performance efficiency (OAPE20) of the gabion spillways. Besides, traditional equations, namely developed multivariable linear regression (MLR) and multivariable nonlinear regression (MNLR) along with the previous models were also employed in estimating OAPE20 of the gabion spillways. Results in the testing phase showed that the DNN with the highest value of correlation (correlation of coefficient (CC) = 0.9713) and lowest values of errors (root mean square error (RMSE) = 0.1684, mean squared error (MSE) = 0.0283, and mean absolute error (MAE) = 0.1532) demonstrated the best results in estimating OAPE20 of the gabion spillways; however, other applied models such as GBM, NN, MLR, and MNLR were giving comparable results evaluated to statistical appraisal metrics, but previous studies were performing incredibly poor with the lowest value of correlation and highest values of errors. The datasets employed here were collected by conducting experiments. From the relative significance of input parameters, the Reynolds number (Re) was observed to be a crucial parameter. At the same time, the ratio of the mean size gabion materials to the length of the gabion spillway (d50/L) had the least impact over the OAPE20 of the gabion spillways. HIGHLIGHTS The test for the aeration performance efficiency of gabion spillways was studied.; Machine learning techniques were used for estimating the gabion spillway aeration efficiency.; The estimating potential of DNN, GBM, NN, etc., was compared.; The DNN model outperformed the other proposed models.; A sensitivity test was conducted to know the relative impact of the input variable on the output results.;
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