| Popis: |
Both sounding and sediment sampling on the sea bottom have been carried out by the same method as the last time in Yotsuyahama coast on July.27 2011, July.24 2012, Sept.30 2014, and Oct.2 2014. Several sedimentary samples on the sea bottom have been tried to analyze into the grain size with precise accuracy. Also, these datas were attempted to analyze surely. Double crescent-shaped bars were found out on those two measuring lines of the sea bottom. It was shown clearly that the existence of submerged breakwater has given the full influence to the sedimentation of the sea bottom. The results of data analyses on both the bottom profile and the grain size composition of the sediment on the sea bottom provide some ideas to understand the reasons for the coastal erosion. |
