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Nontraditional baroclinic wave effects in the Strait of Gibraltar

直布罗陀海峡的非传统斜压波效应

基本信息

批准号：
NE/F010214/1
负责人：
Vasyl Vlasenko
金额：
$ 5.92万
依托单位：
Plymouth University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FF010214%2F1
关键词：
Nontraditional baroclinic wave effects Strait

项目摘要

General wave theory suggests that baroclinic bores produced by a barotropic tide over bottom topography and propagated from the source of generation, disintegrate into a system of well rank-ordered internal waves packet. However, the majority of observational data collected in the Strait of Gibraltar by the University of Malaga during the three-month measurements at moorings located in the middle of the strait and beyond it (50 km off the strait in the Alboran Sea) doesn't support this idea. Less than 40% of all registered wave packets demonstrated the rank-ordered structure, whereas the rest of wave packets were clearly non-rank ordered. An evident contradiction between the up-to-date understanding of the wave process and observational evidence is a big challenge and strong motivation of the present study. It is important to make clear bearing in mind the great role which mixing processes initiated by tidally generated internal waves play both for regional ecological situation in the strait and adjacent areas and for the formation of the Deep Mediterranean Waters on a global scale. It is hypothesized in the project that the irregular structure of the observed packets is a manifestation of a more general mechanism of interaction of propagating along the channel large-amplitude internal waves with its lateral boundaries where extensive wave breaking, water mixing, wave refraction and reflection take place. Being repeated many times in every wave packet, these processes produce a complex spatial wave structure in which wave energy can transform both from wave to wave and sink to turbulence. Thus, the present proposal is intended to fill the gap in understanding of the not studied yet mechanism of the three-dimensional evolution of large-amplitude internal waves in the strait. As distinct from many previous theoretical studies which exploited the two-dimensional idea or the hydrostatic approximation for pressure and excluded the effects related to non-hydrostatic internal mixing, this project is aimed to apply a three-dimensiona fully-nonlinear nonhydrostatic numerical model and in combination with observational data to describe and quantify dynamical processes in the strait related to propagation of large amplitude internal waves. The achievement of the project goals is based on the the use of detailed observational data set collected in the Strait of Gibraltar and application of the state-of-the art the Massachusetts Institute of Technology general circulation model.

一般波浪理论认为，由正压潮在海底地形上产生的斜压孔从生成源传播，分解成一个有序的内波包系统。然而，马拉加大学在位于海峡中部和海峡以外（距海峡50公里的阿尔沃兰海）的系泊处进行了为期三个月的测量，在直布罗陀海峡收集到的大多数观测数据并不支持这一观点。不到40%的所有注册的波包表现出秩序结构，而其余的波包显然是非秩序。对波过程的最新认识与观测证据之间的明显矛盾是本研究的一个巨大挑战和强烈动机。重要的是要清楚地认识到，潮汐产生的内波引发的混合过程对海峡和邻近地区的区域生态状况以及对全球范围内地中海深水沃茨的形成都起着重要作用。在该项目中假设，观察到的数据包的不规则结构是一种更一般的相互作用机制的表现，该机制是沿着通道传播的大振幅内波与其横向边界的相互作用，在横向边界处发生广泛的波浪破碎、水混合、波浪折射和反射。这些过程在每个波包中重复多次，产生了复杂的空间波结构，其中波能既可以从波到波，也可以从波到湍流。因此，本建议的目的是填补差距，了解尚未研究的机制，三维演变的大振幅内波在海峡。与以往许多理论研究采用二维概念或静水压力近似，排除了非静水内部混合的影响不同，本项目旨在应用三维全非线性非静水数值模式，结合观测资料，描述和量化海峡中与大振幅内波传播有关的动力学过程。实现项目目标的基础是使用在直布罗陀海峡收集的详细观测数据集和应用最先进的马萨诸塞州理工学院大气环流模型。