These results show that the ANFIS and ANN models can accurately estimate coastal current velocities, although the ANFIS and ANN models at the windy condition give lower correlations. This shows that at the windy condition, the coastal currents are perhaps affected by other currents, such as tidal ones. Nevertheless, the obtained correlation coefficients for the stormy condition show that coastal currents are more influenced by storms, and other currents such as tidal ones are insignificant. Performances of the ANFIS and ANN models are compared in Table 7; it can be seen that the data-driven models outperform the MLR and MNLRP models.

Table 7

Obtained correlation coefficients associated with every employed estimator method

Method
ParameterConditionANNANFISMNLRMLR
General 0.796 0.751 0.569 0.531
General 0.962 0.866 0.583 0.546
Stormy 0.737 0.784 0.512 0.503
Stormy 0.9137 0.933 0.643 0.326
Windy 0.5709 0.571 0.455 0.343
Windy 0.817 0.794 0.578 0.541
Method
ParameterConditionANNANFISMNLRMLR
General 0.796 0.751 0.569 0.531
General 0.962 0.866 0.583 0.546
Stormy 0.737 0.784 0.512 0.503
Stormy 0.9137 0.933 0.643 0.326
Windy 0.5709 0.571 0.455 0.343
Windy 0.817 0.794 0.578 0.541

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