Critical slope analysis about internal_waves_barkley_canyon HOT 7 CLOSED

This looks good. Also suggest just calculating the 2-d gradient and doing the same calc, but with the absolute value of the gradient.

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• Add ray tracing graphic to topography plot, for semidiurnal.

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• Ray tracing (accounting for stratification; see paper Jody linked).

• Get gradient at each grid point for bathymetry, plot M2 criticality.

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• Calculated the gradient magnitude (slope, beta) at each grid point.
• Divided by alpha_M2, adjusted for the depth at each grid point from elevation data.
• Near-critical is white, subcritical is blue, and supercritical is red.
• Most of the region is supercritical to M2, with notable exceptions at the canyon bottom and above the shelf-break.
• Upper Slope instrument site is on the supercritical edge of the near-critical region below the shelf-break; mainly downward reflection.
• Axis instrument sits on the subcritical canyon floor surrounded by the supercritical canyon walls; upward reflection at the canyon floor and downward reflection from the canyon walls, together could lead to M2 internal tides 'trapped' in the lower canyon?

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• Put the depth contours on this plot, rather than the topography.

Will use this as primary site plot and for criticality discussion.

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• Desaturate red a bit.
• A few major contours (200,500,1000,1500?) thicker, the rest thinner.
  

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Done for now! Can revisit if need to change anything for publication. Using as site map and in criticality writing.

Update: Removed labels from sub-contours.

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