The harbor consisted of several elements , including massive reinforced concrete caissons , breakwaters , a floating roadway and piers .
这个港口由好几个部分组成，包括巨大的加强混凝土沉箱，防波堤，一条浮道和一些码头。
Prof shibayama says japan should now rebuild its breakwaters and sea walls , while recognising the limits of such physical defences by also moving residential areas further up hills or away from the sea .
As the first line of defence , communities built sea walls with tsunami gates for river mouths that could be closed when waves approached , as well as offshore breakwaters and raised river dykes .
