抄録
This paper describes energy decrease of water current by flowing into the multiseriate cylinder type wave mitigation structure. This structure is based on tsunami mitigation coastal forest effective to reduce tsunami disaster. However, natural forests have many problems such as low fraction of trees, low visibility of ocean waves, low strength, long time to grow, and so on. In order to cope with these problems, a multiseriate cylinder type wave mitigation structure has been proposed, which are intended to have better capability of high wave or tsunami mitigation than actual ones by optimizing various parameters such as configuration, density and material. In this study, the effect of type of material, that is, stainless steel (SUS304), aluminum alloy (A2017-T4) and polyacetal polymeric (POM) were compared as a function of number of rows. Furthermore, structural vibrations were measured by using acceleration sensors. According to the results, reduction rate of the flow velocity increases with increasing number of rows for both materials, and that of cylinders having lower Young's modulus is generally higher than that of cylinders having higher Young's modulus. This tendency is considered to be caused due to easiness of vibration.
