I find it hard to believe they have not protective effect. You can throw pretty much anything hard with an irregular shape down and it’ll help scatter energy
replyThey don’t prevent erosion though which is the primary issue
replyOk I stand corrected these are NOT tetrapods. Sorry for the confusion
replyWell, confusingly, the last picture on the blogpost look (to my untrained eye) to be tetrapods. Those are 'tetrahedral' (ish) shapes.
replyIn contrast, the https://en.wikipedia.org/wiki/Dolos (plural 'Dolosse') are two tapering cylinders at right angles to each other. They have the same symmetry, but a different structure. Does that make any difference to how effective they are? No idea!
edit: When I said the "same symmetry" of course I should have said the dolos has some of the symmetries of the tetrapod (subgroup?).
Maybe the form variations were just for patent circumvention.
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