Study of the performance of support vector machine for predicting vertical drop hydraulic parameters in the presence of dual horizontal screens

Abstract

In the present study, the performance of the support vector machine for estimating vertical drop hydraulic parameters in the presence of dual horizontal screens has been investigated. For this purpose, 120 different laboratory data were used to estimate three parameters of the drop: the relative length, the downstream relative depth, and the residual relative energy in the support vector machine. For each parameter, 12 models were analyzed by using a support vector machine. The performance of the models was evaluated with statistical criteria (R2, DC, and RMSE) and the best model was introduced for each of the parameters. The evaluation criteria for the relative length of the vertical drop equipped with dual horizontal screens for the testing stage are R2 = 0.992, DC = 0.981 and, RMSE = 0.050. Also, the values of the downstream relative depth evaluation indicators for the testing stage are R2 = 0.9866, DC = 0.980 and, RMSE = 0.0064. For the residual relative energy parameter, the values of the residual relative energy evaluation indicators are R2 = 0.9949, DC = 0.9853 and RMSE = 0.0056. The results showed that capacity for this approach to predict the hydraulic performance of these systems with accuracy.

Predicting relative energy dissipation for vertical drops equipped with a horizontal screen using soft computing techniques

“…Diversified SVM model results have been utilized to pridict vertical drop hydraulic parameters in the presence of dual horizontal screens (Daneshfaraz et al 2020a(Daneshfaraz et al , 2020b(Daneshfaraz et al , 2020c. SVM models have also been used to investigate labyrinth and arched labyrinth weir discharge coefficients (Roushangar et al 2017) and to study trapezoidal labyrinth weir discharge coefficients (Norouzi et al 2019a(Norouzi et al , 2019b.…”

“…An experimental study was employed by (Daneshfaraz et al 2020a(Daneshfaraz et al , 2020b(Daneshfaraz et al , 2020c to investigate the impact of dual horizontal screens on hydraulic behavior. The results revealed that the mechanism of flow can be transformed from supercritical to subcritical downstream of a drop through the utilization of dual horizontal screens.…”

“…The results revealed that the mechanism of flow can be transformed from supercritical to subcritical downstream of a drop through the utilization of dual horizontal screens. Using vertical screens with two porosity ratios located downstream of inclined drops was investigated by (Daneshfaraz et al 2020a(Daneshfaraz et al , 2020b(Daneshfaraz et al , 2020c. Results showed that compared to a plane inclined drop, the screen also caused an increase of at least 407% and up to 903% in total relative energy dissipation.…”

The impact of cables on local scouring of bridge piers using experimental study and ANN, ANFIS algorithms

“…The results of this study provided an experimental relationship to determine the critical shear stress of sand particles. Daneshfaraz et al (2021aDaneshfaraz et al ( , 2021b studied the hydraulic performance of a horizontal screen with a variable diameter on a vertical drop in the experimental. The results showed that with increasing the relative diameter of the horizontal screen, the turbulence length increased and the pool depth decreased.…”

“…The results showed that the MLP model had a much higher accuracy than other models. Daneshfaraz et al (2021aDaneshfaraz et al ( , 2021b investigated the hydraulic performance of vertical drop using a support vector machine, therefore, they analyzed hydraulic parameters from 120 different experimental data and 12 support vector machine models.…”