DRIFT SIMULATION OF AQUACULTURE FACILITIES IN YAMADA BAY IN THE 2022 TONGA VOLCANIC ERUPTION AND TSUNAMI

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  • 2022年トンガ火山性津波における山田湾を対象とした養殖施設の漂流シミュレーション

Abstract

<p> In order to clarify the damage process of aquaculture facilities caused by the 2022 Tonga volcanic eruption and tsunami, we conducted a field survey to understand the actual damage in the Sanriku coastal area and simulated the drift of aquaculture facilities in Yamada Bay. The tsunami that hit Yamada Bay repeatedly pushed and pulled within the bay, and the aquaculture facilities moved back and forth along with the current. The distribution of the tsunami water level and current velocity revealed the locations and trends where both were particularly large. To quantitatively evaluate the relationship between tsunami and damage to aquaculture facilities, the total distance traveled by aquaculture facilities was newly defined. A positive correlation was found between the velocity and the total distance traveled, indicating that the effect of the tsunami was larger than that of the water level. This result is consistent with previous findings on tsunami damage to aquaculture facilities. This result suggests that there may be areas in the bay that are at high risk of damage to aquaculture products even in the case of small tsunamis.</p>

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