A predictive Mesoscale model of the erosion and profile development of soft rock shores
A predictive Mesoscale model of the erosion and profile development of soft rock shores
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DOI：
10.1016/j.coastaleng.2005.02.005
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发表时间：
2005-06-01
影响因子：
4.4
通讯作者：
Hall, JW
中科院分区：
文献类型：
--
作者：
Walkden, MJA;Hall, JW
本文描述了软岩(如粘土)岸坡后退的一般模型的发展、应用和性态。在海岸模型方面，这代表了一个广泛的系统，包括海岸平台、海滩、潮差、波浪变换、悬崖和距骨。海岸被划分为一系列具有代表性的跨岸剖面，每一条剖面都离散为一列元素。平台元素在每个时间步长的侵蚀取决于其梯度。材料强度作为校准常数处理，波浪力在潮汐或一小时的持续时间内平均，泥沙输运以体积表示。人们的注意力集中在系统部件之间的相互作用和系统特性的出现上，特别是轮廓形状。这是允许向动态平衡发展的，是模型验证的主要手段。剖面形状的出现主要取决于潮汐对波浪冲刷的分布，以及与海滩的相互作用(如果存在的话)。由于该模型是基于过程的，因此可以用来模拟气候变化和工程干预的影响。然而，它在计算上也很便宜，因此可以用来通过概率应用来探索不确定性。所包含的系统的广度，加上短的运行时间，使得对几十年的时间尺度的预测成为可能，我们称之为中尺度。该模型被用来探索软岩海岸剖面后退的动力学，并预测研究地点的未来行为。(C)2005 Elsevier B.V.保留所有权利。
The development, application and behaviour of a generic model of retreating soft rock (e.g. clay) shores is described. This represents a broad system, in coastal modelling terms, comprising shore platform, beach, tidal range, wave transformation, cliff and talus. The coast is divided into a series of representative cross-shore profiles, each of which is discretised into a column of elements. Erosion of a platform element at each timestep depends on its gradient. Material strength is dealt with as a calibration constant, wave forces are averaged over durations of a tide or hour and sediment transport is represented in bulk terms. Attention has been focussed on interaction between system parts and the emergence of system properties, in particular profile shape. This is allowed to develop towards dynamic equilibrium and is the principal means of model validation. The emergence of the profile shape is dominated by the distribution of wave scour by the tide and by interaction with a beach, if present. Because the model is process-based, it may be used to model the effects of climate change and engineering intervention. Yet it is also computationally inexpensive, so may be used to explore uncertainty through probabilistic application. The breadth of the included system, coupled with short run-times, enables predictions over timescales of decades, which we refer to as the Mesoscale. The model is used to explore the dynamics of retreating soft rock shore profiles and to predict future behaviour of a study site. (c) 2005 Elsevier B.V. All rights reserved.