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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The thin blue line: A review of shoreline dynamics across time scales and environments
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The thin blue line: A review of shoreline dynamics across time scales and environments

机译：薄的蓝线：跨时间尺度和环境对海岸线动态进行审查

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A major thread of theoretical research on the response of shorelines to changing boundary conditions has adapted the moving-boundary approach from heat transfer and solidification/melting. On sufficiently short time scales, shorelines respond to changes in relative sea level in a simple, geometrically predictable way. On longer time scales, their behaviour becomes far more complex and interesting, because the surface over which the shoreline moves is itself continually modified by morphodynamics that depend sensitively on shoreline location. This makes the shoreline the archetype of moving-boundary problems in morphodynamics, and subject to potentially counterintuitive behaviours over time scales on which the sediment surface modifies itself as relative sea level changes. We review existing moving-boundary theories and propose two significant extensions to allow inclusion of first-order effects of waves and tides. First, we show how wave effects can be included via planform diffusion linked to river-mouth location, which results in shoreline smoothing during delta-lobe growth and localized transgression after channel abandonment. Tides produce a low-gradient region in which the sea and land overlap; we show how this can be treated in a moving-boundary framework by replacing the shoreline with a 'mushy region' so that the handoff from land to water occurs over a zone rather than a line. We also propose that the moving-boundary approach can be readily generalized to other dynamic moving boundaries, such as those separating different regimes of river transport. The shoreline thus serves as a prototype for modelling dynamic facies boundaries along the whole source-sink system. (c) 2019 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
机译：对变形边界条件的覆盖线响应的理论研究的主要线程，其改变了热传递和凝固/熔化的移动边界方法。在足够短的时间尺度上，海岸线以简单的几何上可预测的方式响应相对海平面的变化。在较长的时间尺度上，它们的行为变得更复杂和有趣，因为海岸线移动本身的表面本身不断地被敏感地依赖于海岸线位置的形态学性。这使得海岸线在形体动力学中的移动边界问题的原型，并且在沉积物表面改变其上的时间尺度随着时间的轮廓而受到潜在的违反直觉行为，随着相对海平面的变化。我们审查了现有的移动边界理论，并提出了两个重要的扩展，以允许包含波浪和潮汐的一阶效果。首先，我们展示了如何通过与河口位置相关的平面形式扩散来包括波浪效应，这导致在达到达洛叶的增长和局部迁移过程中的海岸线平滑。潮汐产生一个低梯度区域，其中海和陆重叠;我们展示了如何通过用“糊状区域”更换海岸线来在移动边界框架中对待，从而从土地到水的切换发生在一个区域而不是一条线上。我们还提出了移动边界方法可以容易地广泛地推广到其他动态移动边界，例如分离不同河流传输制度的那些。因此，海岸线用作用于沿整个源汇系统建模动态相边界的原型。 （c）2019年作者。 John Wiley＆Sons Ltd.出版的地球表面流程和地貌

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