Development of numerical models for wave deformation and sediment transport in wave-current coexisting field near river mouth

河口附近波流共存场波浪变形与泥沙输运数值模型的建立

• 批准号: 15560442
• 负责人: YUHI Masatoshi
• 金额: $ 2.37万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560442/
• 关键词: river mouth; wave-current coexisting field; wave deformation; sediment transport; estuary; Boussinesq equation; wave action equation; empirical orthogonal eigenfunction analysis

Physical understanding of wave characteristics and corresponding sediment transports around river mouths is essentially important in order to maintain physical environments and to prevent natural disasters in coastal areas. In this study, numerical and statistical models are developed for the wave transformation, viscous water flows, cohesive mudflows, and morphological seabed changes in the wave-current coexisting fields near river mouths. The main results obtained in this study are summarized as follows.A wave prediction model based on the wave action balance equation has been developed for analysis of wave deformation in large areas. This model includes the effects of wave breaking and diffraction in the wave-current coexisting fields. For detailed analysis of wave transformation in smaller areas, improved Boussinesq equations are derived and the corresponding numerical model has been constructed. In addition, the two-and three-dimensional viscous flow fields around coastal structures are numerically investigated on the basis of the Navier-Stokes equations in a generalized curvilinear coordinates. The characteristics of mudflows consisting of water and small mud particles are also examined.Furthermore, long-term variations of the seabed profile near Tedori river mouth, Japan, are investigated using a set of field surveys. The effects of the sediment management along the river such as dam construction and sand dredging on the seabed morphology near the river mouth is examined. The mudflat profiles near the Shirakawa river mouth, Japan, have also been analyzed by using a quadratic profile approach.

对河口周围波浪特征和相应的泥沙输运的物理了解对于维护沿海地区的物理环境和预防自然灾害至关重要。本文建立了河口附近波流共存场的波浪变形、粘性水流、粘性泥石流和海床形态变化的数值和统计模型。本文的主要研究成果如下：建立了一个基于波浪作用平衡方程的波浪预报模型，用于分析大范围内的波浪变形。该模型考虑了波流共存场中波浪破碎和绕射的影响。为了更详细地分析波浪在较小区域内的变形，推导了改进的Boussinesq方程，并建立了相应的数值模型。此外，本文还基于广义曲线坐标系下的Navier-Stokes方程，数值模拟了二维和三维近岸建筑物粘性流场。此外，还研究了由水和小泥粒组成的泥流的特征。此外，通过一系列野外调查，研究了日本Tedori河口附近海底剖面的长期变化。研究了河道沿着的泥沙管理措施，如建坝、挖沙等对河口附近海床形态的影响。利用二次剖面法对日本白川河口附近的泥滩剖面进行了分析。

项目成果

山田文彦, 小林信久, 柿木哲哉: "地形パラメータを用いた干潟断面の季節変動の要因分析"海岸工学論文集. 50. 551-555 (2003)

Fumihiko Yamada、Nobuhisa Kobayashi、Tetsuya Kakiki：“利用地形参数对潮滩横截面季节变化进行因子分析”海岸工程杂志 50. 551-555 (2003)。

Effects of terrain on the slow spreading of fluid mud

地形对泥浆缓慢扩散的影响

• 发表时间: 2005
• 期刊: Hydrodynamics 6
• 作者: T.Nakaya;M.Yuhi;H.Ishida
• 通讯作者: H.Ishida

手取川河口域周辺の海底地形変化に対する河川土砂供給の影響に関する研究

河流泥沙供给对手取河口地区海底地形变化的影响研究

• 发表时间: 2004
• 期刊: 海岸工学論文集 51
• 作者: 由比政年;中谷 健;石田 啓;山内正彦;二俣 秀;高橋 至
• 通讯作者: 高橋 至

Parametrization of mud-flat profile changes caused by seasonal tide level variations

季节性潮位变化引起的泥滩剖面变化的参数化

• 发表时间: 2003
• 期刊: Proceedings of Coastal Engineering, JSCE Vol.50
• 作者: F.Yamada;N.Kobayashi;T.Kakinoki
• 通讯作者: T.Kakinoki

Effects of crossing angle between wave and current on three-dimensional flow fields around a cylinder

波与流交叉角对圆柱体三维流场的影响

• 发表时间: 2005
• 期刊: Proceedings of 29th International Conference on Coastal Engineering, ASCE (in press)
• 作者: S.Umeda;T.Magai;M.Yuhi;H.Ishida
• 通讯作者: H.Ishida