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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Influence of wind field and open boundary input upon computed negative surges in the Irish Sea
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Influence of wind field and open boundary input upon computed negative surges in the Irish Sea

机译：风场和边界开放输入对爱尔兰海计算负浪涌的影响

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摘要

A hydrodynamic model of the west coast of Britain (extending from about 57 degreesN to 48 degreesN and 10 degreesW to -4degreesE), employing a range of open boundary conditions, is used to simulate the wind forced response during the period 25 March to 5 April 1994 during which there are positive and negative surges. Strong uniform winds over the region during 30-31 March have the potential to generate a positive surge, and the passage of a depression on 1 April has the potential to produce a negative surge. A simulation using local wind forcing (namely, that in the region covered by the model) with an elevation-specified boundary condition does give a negative surge on 1 April, although this is not actually observed due to "far-field" effects which prevent a flow out of the Irish Sea, and hence the associated negative surge.Calculations with an elevation-specified open boundary condition that could include "far-field" effects (primarily produced by shelf wide winds, and introduced into the region by specifying the observed surge elevation along the open boundary) show that the observed positive surge on 30-31 March is accurately reproduced but that the model still gives a negative surge on 1 April. The application of a radiation boundary condition is equally successful in reproducing the positive surge, but in addition it provides a "far-field" input on 1 April which prevents the outflow from the region and gives elevations in good agreement with observations.It is concluded that the use of either an elevation-specified or radiation boundary condition in a west coast model is equally successful at times of positive surges (which supports previous work). However, new conclusions are being made concerning negative surges. These are in essence, that under conditions in which the local wind field would produce a negative surge, but "far-field" inflow into the west coast region prevents this, an elevation-specified open boundary is not appropriate. In this situation, a radiation condition with input from a shelf wide model is most appropriate. (C) 2004 Elsevier Ltd. All rights reserved.
机译：使用英国西海岸的水动力模型（从大约57°N扩展到48°N，从10°W扩展到-4°E），并采用一定范围的开放边界条件，用于模拟3月25日至4月5日的风力响应1994年期间，出现了积极和消极的增长。在3月30日至31日期间，该地区强烈的均匀风可能产生正激增，而4月1日的低气压通过则可能产生负激增。使用局部高风（即模型覆盖的区域）和指定高程的边界条件进行的模拟确实在4月1日产生了负浪涌，尽管由于“远场”效应实际上并未观察到这种现象，流出爱尔兰海的水流，并因此带来相关的负浪涌。具有特定海拔高度的开放边界条件的计算，其中可能包括“远场”效应（主要由架子风引起，并通过指定观测值引入该区域沿开放边界的浪涌高度）表明，在3月30日至31日观测到的正浪涌已准确再现，但该模型在4月1日仍给出了负浪涌。辐射边界条件的应用同样成功地再现了正激增，但除此之外，它在4月1日提供了“远场”输入，这可以防止从该区域流出，并提供与观测值高度一致的高程。在正激增时（支持以前的工作），在西海岸模型中使用海拔指定条件或辐射边界条件同样成功。但是，有关负激增的新结论正在得出。从本质上讲，这是在局部风场会产生负激增但向西海岸地区“远场”流入阻止这种情况的情况下，指定海拔高度的开放边界是不合适的。在这种情况下，最合适的条件是使用来自货架宽模型的输入的辐射条件。 （C）2004 Elsevier Ltd.保留所有权利。

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