Some Characters of the Sand Wave

Abstract

There are many sand waves developed on the gravel bank at the depth of about 11 meters lying in the Kanmon Passage. In 1971, sand waves were eliminated by the dredging to the depth of about 12 meters. By the sounding of this bank in 1972, we found sand waves again having wave length and amplitude same as those of the former sand waves in the same area.There are two types of sand wave; erosional and depositional.The former is formed on the level lower than the level of adjacent sea bottom, and the latter corresponds to the level of adjacent sea bottom.