Model studies of dense water overflows in the Faroese Channels
Model studies of dense water overflows in the Faroese Channels
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法罗群岛海峡浓水溢流模型研究
DOI：
10.1007/s10236-013-0685-2
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发表时间：
2014
期刊：
影响因子：
2.3
通讯作者：
Cuthbertson A
中科院分区：
文献类型：
--
作者：
Cuthbertson A
通过实验室实验和麻省理工学院环流模型的数值模拟，研究了来自北欧海的稠密水通过法罗海峡系统的溢出。在实验研究中，法罗-设得兰海峡、威维尔-汤姆逊盆地、海脊和法罗海岸海峡海底测深的比例地形图被建造并安装在一个旋转水箱中。使用染料示踪和水柱跟踪技术进行了一系列参数化实验，以研究模拟区域内的深水溢出路径和环流模式。此外，通过位于Wyville-Thomson盆地的三个跨通道横断面和通往Faroe Bank Channel的收敛、向上倾斜的途径的密度剖面，研究了流出的致密底水的结构。染料示色研究的结果证明了一系列参数条件，在这些参数条件下，稠密水会在威维尔-汤姆逊岭发生溢出，如Burger数、无因次长度比和在法罗-设得兰海峡入口边界指定的无因次稠密水体积通量参数所定义的那样。螺旋跟踪测量揭示了在模拟地形中产生的流动路径和环流的复杂性质，特别是威维尔-汤普森盆地中大型反气旋环流的发展和法罗河岸通道的上坡路径，它将法罗大陆架的密集水流转向威维尔-汤姆森山脊，潜在地促进了密集水流在山脊本身的溢出。这种环流的存在也由威维尔-汤姆逊盆地的密度等压线的相关波动表明。法罗海峡模型域内主要流出通道和密度结构的参数化测试用例的数值模拟表明，与实验观测和测量结果在定性上非常一致。此外，比较表明，预测的流出通道和环流的强烈时间变动性对调节法罗河岸海峡和威维尔-汤姆逊岭溢流以及确定法罗海峡对法罗-设得兰海峡入口边界条件变化的总体响应具有强烈影响。
The overflow of dense water from the Nordic Seas through the Faroese Channel system was investigated through combined laboratory experiments and numerical simulations using the Massachusetts Institute of Technology General Circulation Model. In the experimental study, a scaled, topographic representation of the Faroe-Shetland Channel, Wyville-Thomson Basin and Ridge and Faroe Bank Channel seabed bathymetry was constructed and mounted in a rotating tank. A series of parametric experiments was conducted using dye-tracing and drogue-tracking techniques to investigate deep-water overflow pathways and circulation patterns within the modelled region. In addition, the structure of the outflowing dense bottom water was investigated through density profiling along three cross-channel transects located in the Wyville-Thomson Basin and the converging, up-sloping approach to the Faroe Bank Channel. Results from the dye-tracing studies demonstrate a range of parametric conditions under which dense water overflow across the Wyville-Thomson Ridge is shown to occur, as defined by the Burger number, a non-dimensional length ratio and a dimensionless dense water volume flux parameter specified at the Faroe-Shetland Channel inlet boundary. Drogue-tracking measurements reveal the complex nature of flow paths and circulations generated in the modelled topography, particularly the development of a large anti-cyclonic gyre in the Wyville-Thompson Basin and up-sloping approach to the Faroe Bank Channel, which diverts the dense water outflow from the Faroese shelf towards the Wyville-Thomson Ridge, potentially promoting dense water spillage across the ridge itself. The presence of this circulation is also indicated by associated undulations in density isopycnals across the Wyville-Thomson Basin. Numerical simulations of parametric test cases for the main outflow pathways and density structure in a similarly-scaled Faroese Channels model domain indicate excellent qualitative agreement with the experimental observations and measurements. In addition, the comparisons show that strong temporal variability in the predicted outflow pathways and circulations have a strong influence in regulating the Faroe Bank Channel and Wyville-Thomson Ridge overflows, as well as in determining the overall response in the Faroese Channels to changes in the Faroe-Shetland Channel inlet boundary conditions.
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影响因子：
--
作者：
T. Sherwin;Martin Williams;W. Turrell;S. Hughes;P. I. Miller
通讯作者：
P. I. Miller
固定粗糙度元素上的流阻
影响因子：
2.3
作者：
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影响因子：
2.3
作者：
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通讯作者：
P. Davies
DOI：
10.1016/j.dsr.2011.05.005
发表时间：
2011
期刊：
Oceanographic Research Papers
影响因子：
--
作者：
Stashchuk N
通讯作者：
Stashchuk N
DOI：
10.1016/s0967-0637(01)00058-9
发表时间：
2002
期刊：
Deep Sea Research and Oceanographic Abstracts
影响因子：
--
作者：
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通讯作者：
A. Wåhlin