| 研究実績の概要 |
55 years of wave modeling was performed in Northeast Asia and intra-annual variation and long-term change were assessed. The results showed that in general, the nearshore areas of the eastern Pacific side of Japan have the highest annual mean wave power and the wave energy hotspots vary, seasonally mainly from the east of Japan during the spring to Ryukyu Islands and Taiwan during the autumn. The results indicate that the intra-annual stability of wave energy resources is the lowest in the western coasts of Japan, whereas this area has contained the least change of wave energy during five decades.
Moreover, a new climate-dependent sustainability index was proposed taking into account the amount of mean wave power, intra-annual variability in monthly scale, and long-term changes in terms of rate of change. Based on the proposed sustainability index, the eastern Pacific side of Japan is the most suitable area to supply a stable energy resource from the ocean waves. However, the depth limitation for the installation of WECs should also be considered.
Considering the potential of detected areas based on the proposed sustainability index and their depth limitations, they are the priority for further assessment of wave energy potential in local scale using higher resolution dataset as well as depth limitations and the environmental conditions.
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| 今後の研究の推進方策 |
The detected areas as the potential places for wave energy extraction based on the proposed sustainability index and their depth limitations, are the priority for further assessment of wave energy potential in local scale. For this purpose, high resolution wave dataset are required. Hence, wave downscaling will be done in the potential areas in order to evaluate the exploitable wave energy and suggest suitable technologies for wave energy extraction in line with sustainable development.
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