Study on Generalized theory for Sediment Transport Process in Unsteady Flow

非定常流泥沙输送过程广义理论研究

• 批准号: 02452203
• 负责人: NAKAGAWA Hiroji
• 金额: $ 3.78万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452203/
• 关键词: unsteady flow; non-uniform flow; pressure gradient flow; bed-load; suspended load; non equilibrium process; stochastic model; ピックアップレイト; ステップレングス; ムービングペリオド; 非定常開水路流; 振動流; ム-ビングペリオド

The stochastic model quite well describes the temporal and spatial non-equilibrium processes of the sediment transport in both the unsteady and non-uniform flow. This model is consisted of the three subsystems; 1) dislodgement of the particle from the bed characterized by the sediment pick-up rate, 2) the spatial side of the transport characterized by the step length, 3) the temporal side of the transport characterized by the moving period. The hydraulic experiments shows the applicability of the proposed model and the details of the phenomena.The three subsystems are related to the hydraulic parameters based upon both the dynamics and the probabilistic properties of themselves, and the respective relations are approximately expressed by the appropriate equations. Their applicabilities are shown by the devised experiments.The turbulent structure of the unsteady open channel flow is experimentally investigated. In order to examine the change of the flow according to that of the unsteadiness systematically, the unsteady parameter is defined which is constituent of both the properties of base flow and the temporal change of the water depth. By using the proposed parameter, the 1-dimensional hydraulic quantities and temporal change of the flow structure are systematically described.

随机模型较好地描述了非恒定流和非均匀流输沙的时空非平衡过程。该模型由三个子系统组成：1）颗粒从床面的移出，其特征在于沉积物拾取速率，2）输送的空间侧，其特征在于步长，3）输送的时间侧，其特征在于移动周期。水力试验结果表明，该模型具有较好的适用性，并揭示了这三个子系统与水力参数之间的关系，它们分别基于各自的动力学特性和概率特性，并通过相应的方程近似表达。设计的实验验证了它们的适用性，并对明渠非定常水流的湍流结构进行了实验研究。为了系统地考察水流随不稳定性的变化，定义了不稳定性参数，它既反映基流特性，又反映水深随时间的变化。利用该参数，系统地描述了一维水力量和水流结构的时间变化。

项目成果

Tetsuro Tsujimoto: "Turbulent flow over bed coverd by rigid vegetation" Journal of Hydroscience and Hydraulic Engineering. 10. 13-25 (1992)

Tetsuro Tsujimoto：“被刚性植被覆盖的床上的湍流”水科学与水利工程学杂志。

Hiroji Nakagawa: "Stochastic simulation of bed-load transport under oscillation-current coexisting flow" Proc. of 6th Int. Symp. on Stochastic Hydraulics. 197-204 (1992)

Hiroji Nakakawa：“振荡电流共存流下床荷输送的随机模拟”Proc。

Hiroji Nakagawa: "Non-equilibrium sediment transport along a temporal axis" Proc. of Japanese Coastal Engineering Conference. Vol.39. 311-315 (1992)

Hiroji Nakakawa：“沿时间轴的非平衡沉积物输送”Proc。

中川 博次: "流砂の時間軸上の非平衡性を考慮した漂砂量式" 海岸工学論文集. 39. 311-315 (1992)

Hirotsugu Nakakawa：“考虑流沙在时间轴上的非平衡特性的沙子传输公式”海岸工程杂志 39. 311-315 (1992)。

禰津 家久: "非定常開水路流れの乱流構造" 乱流シンポジウム講演論文庫. 24. 144-148 (1992)

Iehisa Nezu：“不稳定明渠流的湍流结构”湍流研讨会讲座档案 24. 144-148 (1992)