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Wind-Wave-Current Coupled Model for Coastal Current System in the Wave-Shoaling Region

浪滩区沿岸流系统风波流耦合模型

基本信息

批准号：
14350266
负责人：
YAMASHITA Takao
金额：
$ 9.15万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350266/
关键词：
coastal current system ocean wave model ocean model meso-scale meteorological model air-sea interaction observation pier air turbulence wind-induced current 波浪浅水変形大気・海面相互作用海岸波浪海上風冬季季節風

项目摘要

Objectives : This research project aims to make clear the processes of momentum exchange between atmosphere and ocean and to establish a numerical model for describing air-sea interaction in the coastal ocean. The momentum flux from an air turbulent flow to ocean through a wave in the wave shoaling region is modeled. Using observed knowledge, numerical model for describing an interaction system of air-wave-coastal current was constructed.Main Results : The result s obtained by this research are as follows.(1)Observational researches :The generating mechanism and structure of a coastal current system were clarified by a wave and current observation in the wave shoaling region at the Ogata Wave Observatory, Disaster Prevention Research Institute, Kyoto University.(2)Coastal Current System :The mathematical model of the coastal current system which consists of fields of wind, wave, turbulent flow, and mean coastal current was built. It clarified that a coastal current system was major external force of material transportation in winter Monsoon in the coasts along Japan Sea.(3)Air-Wave-Current Coupled Model:Wave breaking shear stress was proposed as a white-cap dissipation in which wave energy is changed into a flow. Thereby, the Air-Wave-Current Coupled Model was established and the simulation of storm surges and high waves was carried out. Huge wave simulation in Japan Sea was conducted by Air-Wave coupled model, surge-wave interaction in Yatsushiro Sea and the Bay of Bengal were also conducted by Air-Wave-Current Coupled Model.(4)Atmosphere-Land Surface-Ocean Coupled Model:Synthesizing the model in (3) and the models of rainfall, runoff, and land surface, the integrated model for simulation of water cycle and a material transportation was established. Observation data in Tanabe Bay was employed for verification of the model

目的：阐明海洋与大气之间的动量交换过程，建立描述近海海气相互作用的数值模式。模拟了波浪浅滩区域内空气湍流通过波浪进入海洋的动量通量。利用观测到的知识，建立了描述空气-波浪-沿岸流相互作用系统的数值模型。主要结果：(1)观测研究：通过京都大学防灾研究所绪方波观测站的波流观测，阐明了沿岸流系统的形成机制和结构。(2)沿岸流系统：建立了由风、浪、湍流场和平均沿岸流组成的沿岸流系统的数学模型。阐明了海岸流系统是日本沿海冬季风物质输送的主要外力。(3)气-波-流耦合模型：提出了波浪破碎剪应力作为白帽耗散的观点，将波浪能量转化为气流。在此基础上，建立了风浪流耦合模型，并对风暴潮和大浪进行了数值模拟。(4)大气-陆面-海洋耦合模型：将(3)中的大气-陆面-海洋耦合模型与降雨、径流、陆面模型相结合，建立了模拟水循环和物质输运的一体化模式。利用田边湾的观测资料对模型进行了验证