Hydraulic Phenomena Accmpanied with Driftwood

伴随浮木的水力现象

• 批准号: 07650600
• 负责人: NAKAGAWA Hajime
• 金额: $ 1.34万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650600/
• 关键词: Driftwood; Diffusion; Debris Flow; Wave Motion; Storm Surge; Voltex Motion; Damming-up of Driftwood; 堰止め; 波動場; シミュレーション

A numerical simulation model has been developed for computing the behavior of driftwood and its dam up process due to jamming between and/or in front of the houses when driftwood debouches into horizontally two-dimensional flow field. Equations of rotational motion of driftwood is evaluated dynamically in the Lagragian form as well as equation of translational motion. The calculation was accomplished by an interacting combination of Eulerian fluid and Lagragian driftwood equations, in which a trubulent diffusivity and rotational angular velocity of the driftwood were also stochastically given. The positions, rotational angles in a group of driftwood, and time change of the number of stopped driftwood between and/or in front of the houses in the experiments are well explained by the calculation. Moreover, the risk of swept away of wooden houses found to be increased by the dam-up experimentally.

已经开发了一个数值模拟模型，用于计算当浮木进入水平二维流场时，浮木的行为及其由于房屋之间和/或前面的堵塞而堵塞的过程。浮木的旋转运动方程以拉格朗日形式以及平移运动方程进行动态评估。该计算是通过欧拉流体和拉格朗浮木方程的相互作用组合完成的，其中还随机给出了浮木的湍流扩散率和旋转角速度。计算很好地解释了实验中一组浮木的位置、旋转角度以及房屋之间和/或前面停止的浮木数量的时间变化。而且，实验发现，筑坝会增加木屋被冲走的风险。

项目成果

Nakagawa Hajime: "Estimation of Hydraulic force Acting on the Driftwood and Its Flow Behavior and Process of Damming up" Research Report for Hydraulic Committee of JSCE. 55-73 (1996)

Nakakawa Hajime：“作用于浮木的水压力及其流动行为和筑坝过程的估计”为日本土木工程师协会水利委员会提供的研究报告。

木村一郎・細田 尚・他: "平面二層モデルによる複断面開水路流れの水平渦運動解析" 水工学論文集. 第40巻. 699-704 (1996)

Ichiro Kimura、Nao Hosoda 等人：“使用平面两层模型进行多截面明渠流的水平涡运动分析”《水利工程杂志》，第 40 卷，699-704 (1996)。

Kimura Ichiro, Hosoda Takashi and et al.: "Numerical Simulation of Horizontal Vortices in a Compound Open Channel Flow" Annual Jour.of Hydraulic Engineering. Vol.40. 699-704 (1996)

Kimura Ichiro、Hosoda Takashi 等人：“复合明渠流中水平涡流的数值模拟”水利工程年度杂志。

Nakagawa, H., K. Inoue, M. Ikeguchi and T. Tsubono: "Behavior of Driftwood and the Process of Its Damming up" Jour. of Hydroscience and Hydrarulic Engineering. Vol. 13 No. 2. 55-67 (1995)

Nakakawa, H.、K. Inoue、M. Ikeguchi 和 T. Tsubono：“浮木的行为及其筑坝的过程”Jour。

井上和也・他: "沿岸域における河川流出水の拡がりの解析" 水工学論文集. 第40巻. 473-478 (1996)

Kazuya Inoue 等：“沿海地区河流径流的扩散分析”水利工程学报，第 40 卷，473-478（1996 年）。