Tide embankments built as tsunami countermeasures along the coast of Shizuoka Prefecture have been forested on both the seaside and landside slopes. In this study, the effect of average wind speed (1.5 m/s on the seaside slope; 0.9 m/s on the landslide slope) on the height of trees planted in 2015 was investigated. Of the four tree species planted on the tide embankments, only Euonymus japonicus Thunb was significantly shorter on the seaside slope. No significant difference was found between the two slopes for Pinus thunbergii Parl, which continued to grow, Rhaphiolepis indica Makino, which showed declining growth, and Pittosporum tobira Aiton, which gradually declined. It is likely that the latter two species were strongly affected by conditions other than wind. All four tree species were damaged by sea breeze and browning of branches and leaves due to record typhoon No. 24 in 2018. On the seaside slopes, tree heights of Euonymus japonicus Thunb, R. indica Makino and P. tobira Aiton decreased significantly. The effect of sea breeze on planted trees on tide embankments in Hamamatsu differed in a species-specific manner. Thus, we consider that wind conditions on seaside slopes are more severe than on landside slopes for planted trees.

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