Buoyancy Effects on Hydrodynamics of Semi-Enclosed Bay

浮力对半封闭海湾水动力的影响

基本信息

批准号：
02302067
负责人：
MUROTA Akira
金额：
$ 3.07万
依托单位：
Osaka Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02302067/
关键词：
Stratified flow Semi-enclosed Sea Front Water exchange Tidal flow system Wing-induced current Water quality Internal wave 閉鎖性海域

项目摘要

Four research meetings have been held during two years of the project term for promoting mutual understanding about the role of density-induced currents on the hydrodynamics of semi-enclosed bays, and discussing the following synthetical themes ; (a) the effects of external forces and geometries of semi-enclosed bay on the flow and density structure ; (b) the buoyancy effects on turbulent transport of momentum and passive water qualities such as temperature, salinity and turbidity ; and (c) individual subjects studied in individual coastal and estuarine waters by co-operative investigators. The results of individual subjects are as follows :(l) Murota and Nakatsuji develop a three-dimensional baroclinic model for examining ther hydrodynamics of an estuarine front and a tidal front observed in Osaka Bay. The mutual effects of stratification, the earth's rotation and tidal modulation are clarified quantitatively.(2) Fujiwara clearly shows the estuarine circulation in Osaka, Bay on the ba … More sis of many field observations. Taking note of stratification structure in the narrow entranced embayments such as Osaka Bay, the constant current system is classified depending on the induced forces ; tidally-induces and buoyancy-induced residual currents.(3) Muraoka and Nakatsuji analyze hydrodynamically field data of temperature and velocity fluctuations which were measured related with the upwelling phenomena of 'Aoshio' (anoxic water) often observed in Tokyo Bay. A two-dimensional experiments are performed to clarify the mechanism of upwelling and mixing of two-layered stratified flow system exposed to wind stresses at the surface.(4) Murakami carries out hydraulic experiments for examining the effects of geometrically-induced horizontal circulation and buoyancyinduced vertical circulation on the water exchange when the breakwater is constructed at the mouth of enclosed bay.Furthermore, the numerical experiments were performed for clarifying the dependency of numerical schemes such as layer model and level model on the resulting difference in the computed vertical circulation.(5) Oonishi develops a system for the analysis of river effluent spreading using satellite data. Effluent from the Singuu River are analyzed as an example to study the difference in the dispersion areas detected by water temperature and water turbidity.(6) Ookubo measured temperature fluctuations due to the interfacial waves in a shallow North Lake in Australia within the range between the internal wave of buoyancy frequency and the surface wind ripple and evaluate the vertical eddy viscosity coefficient under the influence of stratification. These results are compared with observation results obtained in the south water of Biwa Lake.(7) Michioku measured temperature and velocity fluctuations in Nunobiki Reservoir, Kobe and analyzed the relationship between their fluctuations and meteorological factors such as wind and temperature. The flow structure and mixing process in a stratified reservoir are clarified. Less

在项目术语的两年中，已经举行了四次研究会议，以促进对密度诱导的电流在半封闭湾流体力学上的作用的相互了解，并讨论以下合成主题。（a）半封闭式海湾的外力和几何形状对流量和密度结构的影响；（b）对动量和被动水品质的湍流运输的泡沫影响，例如温度，盐度和浊度；（c）合作研究人员在个别沿海和河口水域中研究的个体受试者。单个受试者的结果如下：（l）Murota和Nakatsuji开发了三维斜压模型，用于检查在大阪湾观察到的河口前部的流体动力学和潮汐阵线。分层，地球的旋转和潮汐调制的相互作用被定量阐明。（2）富士夫清楚地表明了大阪的河口循环，在BA上的BAY上……许多田间观察的更多SIS。注意狭窄入口胚胎（例如大阪湾）中的分层结构，根据诱导力对恒定电流系统进行分类。（3）Muraoka和Nakatsuji分析了与“ Aoshio”（Aoshio'（Asosio）（缺氧水）相关的温度和速度波动的水动力场数据，这些水平和速度波动的水动力场数据经常在东京湾观察到。进行了二维实验，以阐明暴露于表面上的风应力的两层分层流系统上升和混合的机制。（4）村上进行了氢化实验，以检查几何学诱导的水平循环和浮游在水上循环时，在水上诱导的垂直循环时，在水上循环时，在毛茸茸的垂直循环中，正在发生的水平，该狗的交换是散发出的，缝合了嘴巴的嘴巴，是散发出的狗室，是散发出的nogerf offerf offerf offerf offerfe。进行了数值实验，以阐明数值方案的依赖性，例如层模型和水平模型对计算的垂直循环的产生差异。（5）Oonishi开发了一种使用卫星数据分析河流有效扩散的系统。 Effluent from the Singuu River are analyzed as an example to study the difference in the dispersion areas detected by water temperature and water turbidity.(6) Ookubo measured temperature fluctuations due to the interfacial waves in a shallow North Lake in Australia within the range between the internal wave of bueyancy frequency and the surface wind ripple and evaluate the vertical eddy viscosity coefficient under the influence of stratification.将这些结果与在比瓦湖南水中获得的观察结果进行了比较。（7）Michioku测量了Nunobiki储层中的温度和速度波动，科比分析了它们的波动与气象因素（例如风和温度）之间的关系。阐明了分层储层中的流量结构和混合过程。较少的