A unifying framework for shoreline migration: 2. Application to wave‐dominated coasts
A unifying framework for shoreline migration: 2. Application to wave‐dominated coasts
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海岸线迁移的统一框架：2. 在波浪主导的海岸中的应用
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Murray
中科院分区：
文献类型：
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作者：
M. Wolinsky;A. Murray
[1]根据固定的近岸剖面，广泛用于预测十年至世纪时间尺度上海平面上升引起的海侵的布鲁恩规则忽略了内陆地形和基底岩性的影响，导致在更长时间尺度上的物理不合理预测。我们使用一种新的方法，海岸线埃克斯纳方程，在几十年到几千年的时间尺度上的波浪为主的海岸线海侵模型。我们的研究结果表明，近岸过程和内陆地形之间的相互作用，忽视了布鲁恩式的模型，驱动形态的演变，调制海岸线撤退。分析结果表明，虽然短期的海岸线撤退有时会遵循布鲁恩规则，长期的海侵将始终遵循内陆地形的斜坡。此外，我们的研究结果表明，内陆景观的坡度，相对于近岸坡度，施加一阶控制海岸形态，这样，陡峭的海岸往往形成悬崖背滩，而平缓的海岸往往形成屏障岛泻湖系统。然而，内陆景观和近岸系统之间的成分变化可以改变这种模式。
[1] The Bruun rule, widely used to predict transgression due to sea level rise on decade to century timescales based on a fixed nearshore profile, neglects the influence of inland topography and substrate lithology, leading to physically unreasonable predictions on longer timescales. We use a new approach, the shoreline Exner equation, to model shoreline transgression on wave-dominated coasts over timescales of decades to millennia. Our results show that interactions between nearshore processes and inland topography, neglected by Bruun-style models, drive morphologic evolution which modulates shoreline retreat. Analytical solutions suggest that while short-term shoreline retreat will sometimes follow the Bruun rule, long-term transgression will always follow the slope of the inland topography. Moreover, our results show that the slope of the inland landscape, relative to the nearshore slope, exerts a first-order control on coastal morphology, such that steep coasts tend to form cliff-backed beaches while gentle coasts tend to form barrier island-lagoon systems. However compositional variations between the inland landscape and nearshore system can alter this pattern.