津波による大規模土砂移動の解析と評価方法の開発

建立了考虑层载和悬载的海啸沙移数值模拟模型，其中悬载最大浓度Cs和垂直扩散系数是重要参数。在1854年安生东海地震海啸中，垂直扩散系数的影响很小，而最大悬载集中（Cs）的影响很大。通过测试用例估计了斜率上一维问题的c值。采用数值模拟方法，对1854年安生东海海啸造成的伊豆入间大堆积沙进行了数值模拟。结果表明，该数值模型能较好地模拟出沙体的整体运动，但模拟出的沙体剖面与实测剖面的拟合性较差。

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.