津波による大規模土砂移動の解析と評価方法の開発

海啸引起的大规模泥沙运动分析评价方法的发展

• 批准号: 08408013
• 负责人: SHUTO Nobuo
• 金额: $ 8.9万
• 依托单位: IWATE PREFECTURAL UNIVERSITY (1998)Tohoku University (1996-1997)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08408013/
• 关键词: Sand movement; historical tsunami; earthquake tsunami; Topography change model; The 1954 Ansei Tkai earthquake and tsunami; 津波; 底面境界層; クノイド波理論; 掃流砂量; 巻き上げ砂量; 掃流力; 浮遊砂濃度; 津波堆積物; 歴史地震・津波; 土砂災害; 津波水理実験; 津波移動床数値モデル

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.

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总体过程，但模拟的陆地上的正常存款剖面与实测剖面的对应性不好。

项目成果

Imamura,F et al.: "Sequence of sedimentation processes caused by the 1992 Flores tsunami: evidence from Babi island"Geology. 25,No.6. 523-526 (1997)

Imamura,F 等人：“1992 年弗洛雷斯海啸引起的沉积过程序列：来自巴比岛的证据”地质学。

Sana, A. and H. Tanaka: "Improvement of full-range quation for bottom shear stress due to waves and current" Coastal Engineering. (印刷中). (1997)

Sana, A. 和 H. Tanaka：“波浪和水流引起的底部剪切应力的全范围方程的改进”沿海工程（正在出版）。

Tanaka, H., B.M.Sumer and C.Lodahl: "Theoretical and experimental studies on laminar boundary Tayer under cnoidal waves" Coastal Engineering Journal. 40/No.1(印刷中). (1998)

Tanaka, H.、B.M.Sumer 和 C.Lodahl：“椭圆形波下层流边界 Tayer 的理论和实验研究”沿海工程杂志 40/No.1（出版中）。

Tanaka, H. and Van To Dang: "Geometry mof sand ripple due to wave-current co-existent flows" Journal of Waterway, Port, Coastal and Ocean Engineering. Vol. 122 No. 6. 298-300 (1996)

Tanaka, H. 和 Van To Dang：“波流共存流动引起的沙波纹的几何形状”《水道、港口、海岸和海洋工程杂志》。

Shuto et al.: "Tsunami heights and sand movement due to tsunami of the 1854 Ansei earthquake"Proc. Of Coastal Eng. In Japan, JSCE. 45. 371-375 (1998)

Shuto 等人：“1854 年安西地震海啸导致的海啸高度和沙子运动”Proc.