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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：本研究计划的主要目的是弄清海洋与大气之间的动量交换过程，并建立一个描述近海海气相互作用的数值模式。本文模拟了波浪浅滩区大气湍流通过波浪向海洋的动量通量。利用观测资料，建立了一个描述大气-波浪-沿岸流相互作用系统的数值模型。（1）观测研究：通过京都大学防灾研究所绪方波浪观测所在波浪浅滩区进行的波浪和海流观测，阐明了沿岸流系统的生成机制和结构。（2）沿岸流系统：建立了由风场、波浪场、湍流场和平均沿岸流场组成的沿岸流系统数学模型。阐明了沿岸流系统是沿着日本海沿岸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一种白帽耗散，将波浪能转化为水流。为此，建立了气波流耦合模式，并对风暴潮和高浪进行了数值模拟。采用气波耦合模式对日本海的巨浪进行了数值模拟，并采用气波流耦合模式对八代海和孟加拉湾的涌浪相互作用进行了数值模拟。（4）大气-地表-海洋耦合模式：综合（3）中的模式和降雨、径流、地表模式，建立了水循环和物质输运模拟的集成模式。利用田边湾的观测资料对模型进行了验证