Figure 6.
The graph plots the breaker depth index, y sub b, against H sub b divided by g T squared on the horizontal axis. The y-axis ranges from 0 to 1, with the x-axis values ranging from 0 to approximately 0.03. Two curves are represented: one is a blue curve labelled Envelope and the other a red curve corresponding to E q 13. Both curves display several marked tangency points denoted by circles, identified with labels M 0 to M 8. There are also annotations for equations: E q 9 c is shown near the top left and E q 5 a near the centre right. The layout includes a clear depiction of two different functional relationships in the context of breaker depth dynamics.Comparison between the envelope to Weggel’s lines and Miche’s limiting wave steepness condition transformed to the breaker depth index function given in Equation 14