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Originally Posted by Castout
Wow thank you for your explanation bear with me as I have to confirm some of the answer to make sure I don't get it wrong.
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Originally Posted by Molon Labe
I've never seen a cross-layer CZ contact and I don't expect to. That's not to say it's impossible; I don't know enough about the "rules" of the acoustics model to know that. But, the transmission loss across the layer at 30nm is already very, very high so even if it was within the "rules" to get the CZ bonus across the layer, I doubt it would be enough to result in a contact.
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So I take it that convergence zone contact across layer is actually not really possible but convergence zone contact on the same layer both below and above thermal layer is possible i.e convergence zone contact can happen below thermal layer. |
Well, if Sid is going to dispute it, I'll say that it's possible that I'm wrong. But I don't think I am. To the best of my recollection, I've observed CZ contacts on both sides of the layer.
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Originally Posted by Molon Labe
A real life CZ has very little resemblance to a DW CZ or DW CZ SSP. CZ's don't necessarily form at 30nm intervals and don't occur at all depths simultaneously, but at specific bands in 3-dimensional space (usually--or perhaps always?--near the surface). The SSP also isn't possible without a hell of a lot of excess depth, but a shallow bottom does not prevent the SSP from forming in DW.
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Now I'm a bit confused so convergence contact in RL can only happen near the surface? while in DW convergence zone contact can happen below thermal layer?
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Well, I'm confused myself, hence the question mark. I know that propagation models will show sound paths converging in and around a sound channel; what I'm not sure about is whether these are called convergence zones or if they have another name. I've never seen them identified as such on anything I've read on the subject.