Effect of breakers on blocks of coastal protection structures

1.	Blocks in fill experience a maximum force effect under conditions of wave action close to resonance when tan 0(h/gT 2)–1/2=4.4–7, in which case the stability coefficient acquires a minimum value.
2.	Formula (19) recommended for calculating the characteristic size of a block D (or the mass of a block d=0.52 mD3) satisfactorily agrees with the laboratory and actual data and advantageously differs from the suggestions known from the literature.

Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 7, pp. 18–20, July, 1989.