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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Circulation induced by subglacial discharge in glacial fjords: Results from idealized numerical simulations
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Circulation induced by subglacial discharge in glacial fjords: Results from idealized numerical simulations

机译：冰川峡湾冰川下溢流引起的环流：理想数值模拟的结果

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摘要

The flow caused by the discharge of freshwater underneath a glacier into an idealized fjord is simulated with a 2D non-hydrostatic model. As the freshwater leaves horizontally the subglacial opening into a fjord of uniformly denser water it spreads along the bottom as a jet, until buoyancy forces it to rise. During the initial rising phase, the plume meanders into complex flow patterns while mixing with the surrounding fluid until it reaches the surface and then spreads horizontally as a surface seaward flowing plume of brackish water. The process induces an estuarine-like circulation. Once steady-state is reached, the flow consists of an almost undiluted buoyant plume rising straight along the face of the glacier that turns into a horizontal surface layer thickening as it flows seaward. Over the range of parameters examined, the estuarine circulation is dynamically unstable with gradient Richardson number at the sheared interface having values of <1/4. The surface velocity and dilution factors are strongly and non-linearly related to the Froude number. It is the buoyancy flux that primarily controls the resulting circulation with the momentum flux playing a secondary role.
机译：利用二维非静水模型模拟了冰川下的淡水排入理想峡湾所引起的水流。当淡水水平离开冰川下的开口进入均匀稠密的水的峡湾时，它沿水底扩散成喷流，直到浮力迫使其上升。在最初的上升阶段，羽流蜿蜒成复杂的流动模式，同时与周围的流体混合，直到到达地表，然后随着微咸水的表面向海流动而向水平方向扩散。该过程引起类似河口的循环。一旦达到稳态，水流将由几乎未稀释的浮羽组成，它们沿着冰川的表面直线上升，并随着向海流动而变成一个水平的表层。在所检查的参数范围内，河口环流在剪切界面处具有小于1/4的梯度理查森数的情况下是动态不稳定的。表面速度和稀释因子与弗洛德数强烈且非线性相关。浮力通量主要控制最终的循环，而动量通量起次要作用。

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