| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
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| Outline of Final Research Achievements |
Firstly, as a result of numerical experiments, it was suggested that there are distinct threshold conditions to generate turbidity currents from tsunamis. Turbidity currents can be developed from very dilute suspended clouds due to the self-acceleration mechanism if initial height of clouds are sufficiently high. On the other hand, when the initial conditions are slightly below the threshold condition, turbidity current decays very rapidly. This suggests that only large-scale tsunamis like 2011 Tohoku-Oki Tsunami can produce turbidity currents.
Secondly, the inverse modeling of turbidites proposed in this study enables us to estimate the flow conditions from thickness and grain-size distributions of turbidites that are measured at every ca. 1 km along flow directions. This method will be useful for future investigation of past-tsunami records using tsunami-generated turbidites.
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