In addition to the input variable effects on coastal currents' velocities, another feature in the selection of the input variables is their independency. This issue was investigated here by using a correlation matrix (see Table 2). As shown in the table, correlations among the input variables are low enough to consider them as independent input variables.

Table 2

Correlation matrix for estimating velocities of coastal currents

.	.	.	.	.	.	.
	1
	0.481	1
	0.0204	0.065	1
	0.0908	0.1707	0.0007	1
	0.033	0.111	0.0029	0.008	1
	0.1197	0.1453	0.0038	0.0043	0.1080	1

.	.	.	.	.	.	.
	1
	0.481	1
	0.0204	0.065	1
	0.0908	0.1707	0.0007	1
	0.033	0.111	0.0029	0.008	1
	0.1197	0.1453	0.0038	0.0043	0.1080	1

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