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首页> 外文期刊>Nonlinear processes in geophysics >Lagrangian structure of flows in the Chesapeake Bay: challenges and perspectives on the analysis of estuarine flows
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Lagrangian structure of flows in the Chesapeake Bay: challenges and perspectives on the analysis of estuarine flows

机译：切萨皮克湾的拉格朗日流量结构：河口流量分析的挑战和观点

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摘要

In this work we discuss applications of Lagrangian techniques to study transport properties of flows generated by shallow water models of estuarine flows. We focus on the flow in the Chesapeake Bay generated by Quoddy (see Lynch and Werner, 1991), a finite-element (shallow water) model adopted to the bay by Gross et al. (2001). The main goal of this analysis is to outline the potential benefits of using Lagrangian tools for both understanding transport properties of such flows, and for validating the model output and identifying model deficiencies. We argue that the currently available 2-D Lagrangian tools, including the stable and unstable manifolds of hyperbolic trajectories and techniques exploiting 2-D finite-time Lyapunov exponent fields, are of limited use in the case of partially mixed estuarine flows. A further development and efficient implementation of three-dimensional Lagrangian techniques, as well as improvements in the shallow-water modelling of 3-D velocity fields, are required for reliable transport analysis in such flows. Some aspects of the 3-D trajectory structure in the Chesapeake Bay, based on the Quoddy output, are also discussed.
机译：在这项工作中，我们讨论了拉格朗日技术在研究河口水浅水模型产生的水流输运特性中的应用。我们关注的是Quoddy（见Lynch和Werner，1991）产生的切萨皮克湾的水流，这是格罗斯等人采用的有限元（浅水）模型。 （2001）。该分析的主要目的是概述使用拉格朗日工具的潜在好处，以了解此类流的传输特性，以及验证模型输出和识别模型缺陷。我们认为，当前可用的二维拉格朗日工具，包括双曲线轨迹的稳定流形和不稳定流形，以及利用二维有限时间Lyapunov指数场的技术，在部分混合河口水流的情况下使用有限。三维拉格朗日技术的进一步发展和有效实施，以及对3-D速度场的浅水建模的改进，对于此类流中的可靠输运分析是必需的。切萨皮克湾基于Quoddy输出的3-D轨迹结构的某些方面也进行了讨论。

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