Development of Numerical Model for Ratioanl end Effective Placement of Turbidity Fence

浊度栅合理最终有效设置数值模型的建立

• 批准号: 12555149
• 负责人: AKIYAMA Juichiro
• 金额: $ 5.76万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555149/
• 关键词: water polllution control; turbidity fence; direct dumping of sediments; numerical simulation; solid-liquid two-phase flow; gravity current; particle thermal; swarms of particle; 水質汚濁; 濁水密度流; 数値シミュレーション; LES; Smagorinsky Model

Three numerical models, which include Model 1 based on LES method, Model 2 on FDS method, and Model 3 on SMAC method and MUSCL technique, are developed as a rational and effective method for placing turbidity fence to reduce diffusion of turbidity, which is induced by direct dumping of soil into coastal waters using a bottom-dump barge. Among these model, Model 1 and 3 can simulate three dimensional motion, diffusion and depositional process of the turbidity cloud, which falls and spreads under the action of its own buoyancy during the falling stage, subsequently the turbidity cloud impinges on the bottom boundary, and propagates horizontally along the bottom boundary during the spreading stage.The model performance is examined through two-and three dimensional experimental data. Considering stability, efficiency, accuracy, expandability and flexibility of the models, Model 3 is proposed as a practical model. Furthermore, Model 3 is applied practical situation in order to demonstrate ability of the model.In addition, in order to understand and clarify the fundamental of the phenomena, theoretical and experimental study is also conducted. A thermal theory for the falling stage, the transition depth from thermal phase to swarm phase in terms of-the dumping condition, the transition depth and speed from thermal phase in finite water depth, and others.

三个数值模型，包括基于LES方法的模型1，FDS方法上的模型2以及SMAC方法和MUSCL技术的模型3是一种理性有效的方法，用于放置浊度围栏以减少浊度的扩散，这是通过使用底雨的底部直接倾倒在沿海水域中引起的。在这些模型中，模型1和3可以模拟浊度云的三维运动，扩散和沉积过程，在跌倒阶段在自身浮力的作用下落下并扩散，随后在底部边界处构成浊度云，并在扩展阶段沿底部边界沿底部边界进行水平延伸。考虑到模型3的稳定性，效率，准确性，可扩展性和灵活性，建议将模型作为实际模型。此外，为了证明模型的能力，模型3是应用实际情况。此外，为了理解和阐明现象的基本，还进行了理论和实验研究。降落阶段的热理论，从热相到群的过渡深度，以倾倒条件，有限水深度的热相的过渡深度和速度等。

项目成果

秋山壽一郎, 重枝未玲, 前多陽子: "3次元モデルによる水平面上の粒子サーマルの流動・体積シミュレーション"水工学論文集. 第48巻(in press). (2004)

Juichiro Akiyama、Mirei Shigeta、Yoko Maeda：“使用三维模型进行水平面上的粒子热气流和体积模拟”《水​​利工程杂志》，第 48 卷（出版中）。

J.Akiyama, A.K.Jha, X.Ying, M.Ura: "Numerical study of 2-D particle clouds and effect of turbidity fences"Journal of Hydroscience and Hydraulic Engineering, JSCE. Vol.19, No.1. 141-152 (2001)

J.Akiyama，A.K.Jha，X.Ying，M.Ura：“二维粒子云的数值研究和浊度围栏的影响”水科学与水利工程学报，JSCE。

A.K.Jha,J.Akiyama et al.: "Numerical investigation on the motion of 2-D particle cloud"Journal of Hydroscience and Hydraulic Engineering, JSCE. Vol.19,No1(in press). (2001)

A.K.Jha，J.Akiyama等：“二维粒子云运动的数值研究”水科学与水利工程学报，JSCE。

斎賀 仁, 野中雅之, 秋山壽一郎: "混合粒子群の直投により発生する濁りの流動および堆積特性"平成13年度土木学会西部支部研究発表会講演概要集. 第2分冊. B-190-B-191 (2002)

Hitoshi Saiga、Masayuki Nonaka、Juichiro Akiyama：“直接注入混合颗粒产生的浊度的流动和沉降特性”2001 日本土木工程师学会西部分会研究报告摘要第 2 卷。B-190-B -191 (2002)。

Jha, A.K., Akiyama, J., Ura, M.: "Flux-difference splitting scheme for gravity currents"Adv.in Fluid Modeling & Turbulence Measurements, World Scientific Publication Co.. 283-290 (2002)

Jha, A.K.、Akiyama, J.、Ura, M.：“重力流的通量差分裂方案”流体建模高级