For example, today dikes in the West are built in the shape of sand dunes with considerable extension inward and outward, broad and moderately inclined. As a result the waves gradually dissipate over an extended distance and there is little backwash.
例如西歐的海堤，發展至今，已築得像沙丘一般，裡外延伸綿長，寬而平緩，如此海浪遠遠就可慢慢消掉，反射波不會太大。