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PRCI-AGA PIPELINE ON-BOTTOM STABILITY ISSUE

PRCI-AGA PIPELINE ON-BOTTOM STABILITY ISSUE

PRCI-AGA PIPELINE ON-BOTTOM STABILITY ISSUE

(OP)
Hello,
I am currently making some sensitivity runs on-bottom stability using AGA level 2 for a subsea pipeline , at 20 meter water depth.
 
However , I am getting a strange result which I can’t explain:
 
Taking a typical Case;
 
Current dominant case, with Spectral Peak Period (Tp) = 13.6s, AGA gives a high concrete coating requirement. While using Tp = 16s, AGA is gives a lesser concrete weight concrete.
 
I expected the concrete coating to reduce for a lesser Tp (which is the case for the wave dominant cases) but not the other way around.
 
Please can someone explain to me why i am requiring high concrete weight coating just by reducing Spectral Peak Period (Tp).

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