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.

建立了基于 LES 方法的模型 1、基于 FDS 方法的模型 2、基于 SMAC 方法和 MUSCL 技术的模型 3 三种数值模型，作为放置浊度栅栏以减少浊度扩散的合理有效方法，并归纳出使用底卸驳船将土壤直接倾倒到沿海水域。其中，模型1和模型3可以模拟浊云的三维运动、扩散和沉积过程，浊云在下落阶段在自身浮力的作用下下落、扩散，随后撞击底部边界，扩散阶段沿底部边界水平传播。通过二维和三维实验数据检验模型性能。考虑到模型的稳定性、效率、准确性、可扩展性和灵活性，模型3被提出作为实用模型。此外，模型3还应用了实际情况，以证明模型的能力。此外，为了理解和阐明现象的基本原理，还进行了理论和实验研究。下落阶段的热理论、倾倒条件下从热阶段到群阶段的转变深度、有限水深中从热阶段的转变深度和速度等。

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)。

Ying, X., Akiyama, J., Ura, M.: "Motion of dense fluid released into quiescent water with finite depth"Journal of Hydrau.Coast.Environ.Eng.,JSCE. No.635/II-49. 141-152 (2000)

Ying, X., Akiyama, J., Ura, M.：“释放到有限深度静止水中的稠密流体的运动”Hydrau.Coast.Environ.Eng.杂志，JSCE。