津波による大規模土砂移動の解析と評価方法の開発

建立了考虑床沙和悬移质的海啸泥沙运动数值模型，其中悬移质最大浓度Cs和垂向扩散系数等参数是重要的参数。在伊豆伊鲁玛的例子中，对于1854年安塞东海地震海啸，垂向扩散系数的影响很小，而悬移质的最大浓度(Cs)的影响是显著的。通过对斜坡上一维问题的测试用例来估计Cs。用该数值模式模拟了1854年安塞东海海啸造成的伊苏伊鲁马的大量沙粒堆积。结果表明，数值模式能较好地再现沙粒的运动，但模拟的泥沙沉积剖面与实测值不能很好地吻合。

The numerical model to simulate a sand movement due to tsunami by taking bed and suspended loads into account is developed, in which the parameters such as maximum concentration of suspended load (Cs) and a vertical diffusion coefficient are important. In this case of Iruma, Izu, for the 1854 Ansei Tokai earthquake tsunami, effect of a vertical diffusion coefficient is small whereas those of maximum concentration of suspended load (Cs) is significant. The Cs is estimated through test cases in one-dimensional problem on a slope. The large mount of sand deposit at Iruma, Izu due to the 1854 Ansei Tokai tsunami is simulated by the numerical model. The result shows that the total sand movement could be reproduced by the numerical model but the simulated profile of sane deposit on the land does not show good correspondent to the measured one.