As Strayer points out, we must first define the term “boundary”.
If we use his classification system, we’re left with two major boundary types: “investigative” and “tangible”. Raichlen’s descriptions of waves represent tangible boundaries—they can be calculated with mathematics. These boundaries constantly change but most wave types remain largely predictable.
As seen in Sze’s work, investigative boundaries can be brought on by human development. What does this all mean? In order to sensibly work on shoreline projects, we need to first define the term “boundary” and determine whether or not the boundary in question is tangible (and therefore scientifically calculable).