The concept of “representative tides” in morphodynamic numerical modelling
The concept of “representative tides” in morphodynamic numerical modelling
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形态动力学数值模拟中“代表性潮汐”的概念
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
B. Flemming
中科院分区：
文献类型：
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作者：
C. Winter;M. Chiou;R. Riethmüller;V. Ernstsen;D. Hebbeln;B. Flemming
基于过程的海岸形态动力学数值模拟涉及模型和数据缩减方案，以应对计算限制。一方面，模型简化可能涉及将交互式多维、多样化的自然系统离散化为一组简化的耦合过程模拟模块。另一方面，数据缩减方案用于参数化过程。模式化开放边界条件的使用基于“形态”或“代表性”边界条件的概念，在累积形态效应方面被认为具有代表性。最近的模型应用显示了沉积和侵蚀区域的现实趋势。相比之下，形态特征变化的再现，例如条形、堤岸和通道的迁移，只能偶尔实现。利用观测到的单次风暴事件形态影响的现场数据和数值模型数据，证明了代表性潮汐的概念可能导致形态发展的模拟缺乏自然动力学。有人建议，形态动力学模型不应基于“代表性”单一潮汐，而应应用于开放边界条件，考虑长期潮汐和气象强迫的变化。
Process-based numerical modelling of coastal morphodynamics involves model and data reduction schemes in order to cope with computational limitations. Model reduction, on the one hand, may involve the discretisation of an interactive multidimensional, diverse natural system into a reduced set of coupled process-simulation modules. Data reduction schemes, on the other hand, are used to parameterise processes. The use of schematised open-boundary conditions, which are considered as representative in terms of their cumulative morphological effect, is based on the concept of “morphological” or “representative” boundary conditions. Recent model applications show realistic tendencies in terms of depositional and erosional areas. By contrast, the reproduction of characteristic changes in morphology such as the migration of bars, banks and channels is only occasionally achieved. Using field data on observed morphological impact of a single storm event and numerical model data, it is demonstrated that the concept of representative tides may lead to simulations of morphological development lacking natural dynamics. It is proposed that rather than being based on “representative” single tides, morphodynamic models should be applied with open-boundary conditions which take variations in longer-term tidal and meteorological forcing into account.