Ten "rockfill" to raczej wypełnienie falochronu:
...is a rubble-mound breakwater constructed of rockfill, stones and armor units such as dolosse, quadripods, stabils, tetrapods, tribors or large stone...
http://tinyurl.com/2u2zj6nA common type of breakwater is the rubble mound structure. The structure has three layers: rock fill core stone, an under layer to prevent the core stone from moving and to provide seating for the armor layer, and an armor (outer) layer to absorb and dissipate the oncoming wave energy.
http://www.lre.usace.army.mil/coastalprocesses/CoastalProtec...Można prosić o odnośnik z potwierdzeniem, że "rockfill" to obrzut?