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Two-Channel System Dynamics of the Outer Weser Estuary—A Modeling Study
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2021-04-20 , DOI: 10.3390/jmse9040448
Jannek Gundlach , Anna Zorndt , Bram C. van Prooijen , Zheng Bing Wang

In this paper, we unravel the mechanisms responsible for the development of the two-channel system in the Outer Weser Estuary. A process-based morphodynamic model is built based on a flat-bed approach using simplified boundary conditions and accelerated morphological development. The results are analyzed in two steps: first, by checking for morphodynamic equilibrium in the simulations and second, by applying a newly developed method that interprets simulations based on categorization of the two-channel system and cross-sectional correlation analysis. All simulations reach a morphodynamic equilibrium and develop two channels that vary considerably over time and between the simulations. Variations can be found in the location and depth of the two channels, the development of the dominant channel over time and the alteration in the dominance pattern. The conclusions are that the development of the two-channel system is mainly caused by the tides and the basin geometry. Furthermore, it is shown that the alternation pattern and period are dependent on the dominance of the tides compared to the influence of river discharge.

中文翻译:

外韦瑟河口的两通道系统动力学—建模研究

在本文中,我们将阐明外韦瑟河口两通道系统开发的机理。基于平台方法,使用简化的边界条件和加速的形态学发展,建立了基于过程的形态动力学模型。分析结果分为两个步骤:首先,在仿真中检查形态动力学平衡,其次,使用新开发的基于双通道系统分类和截面相关性分析的方法来解释仿真。所有模拟都达到了形态动力学平衡,并形成了两个通道,这些通道会随着时间的推移以及各个模拟之间的变化而变化很大。在两个通道的位置和深度,主导通道随时间的发展以及优势模式的变化中都可以找到变化。结论是,两通道系统的发展主要是由潮汐和盆地的几何形状引起的。此外,与河流流量的影响相比,轮换的模式和周期取决于潮汐的优势。
更新日期:2021-04-20
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