津波による大規模土砂移動の解析と評価方法の開発

建立了考虑泥沙和悬移质的海啸泥沙运动数值模拟模型，其中悬移质最大浓度（Cs）和垂向扩散系数是重要参数。在1854年安西东海地震海啸的伊豆伊鲁马的情况下，垂直扩散系数的影响很小，而悬浮物（Cs）的最大浓度的影响很大。在一维斜坡问题中，通过测试用例估计Cs。用数值模式模拟了1854年安西东海大海啸在伊豆伊鲁马造成的大量泥沙存款。结果表明，数值模型能较好地再现泥沙运动的全过程，但模拟的陆地上正常存款剖面与实测剖面的对应性不好。

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.