Morphological Modelling using a Modified Multi-layer Approach
Morphological Modelling using a Modified Multi-layer Approach
复制标题
使用改进的多层方法进行形态建模
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Jean
中科院分区：
文献类型：
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作者：
H. Steetzel;Hans de Vroeg;L. van Rijn;Jean
荷兰国家海岸*2000研究计划的主题之一是荷兰海岸的长期(50-100年)和大范围(1-100公里)地形问题及其对海岸管理的影响。这类问题的例子有气候变化和海平面上升对部分受保护的海岸线的影响、正在进行的沙粒补给的长期影响、大规模填海造地和所需采砂的远场影响等。在这一框架内开发了一个概念模型的试行版本(所谓的浮标模型)，基本上能够在上述空间和时间尺度上模拟荷兰海岸的形态演变。本文重点阐述了该模型的理论背景。文中还给出了该模式在荷兰霍克-范-霍兰德和登海尔德之间封闭海岸段的初步应用结果。实际的浮筒模型是基于多层概念的，在该概念中，横岸剖面被概化为多个相互耦合的层，定义在固定的剖面深度之间。这些层通过跨岸运输相互作用。在沿岸方向上，各层对它们所代表的剖面区域所产生的沿岸运移的梯度作出响应。由用户提供的模型的主要输入是要研究的海岸段的特征，包括各层的初始位置以及波浪和潮汐气候表中的近海水力条件。在这些资料的基础上，计算了年平均泥沙输移模式，并将其用于海岸演变的评估。
One of the topics of the National Dutch research program COAST*2000 focuses on the long-term (50-100 years) and large-scale (1-100 km) morphological problems of the Dutch coast and the implications for coastal management. Examples of such problems are the effects of climate change and sea-level rise on a partly protected coastline, the long-term effects of on-going sand nourishments, the far-field effects of large-scale land reclamation and of the required sand-mining etc. Within this framework a pilot version of a conceptual model (the so-called PoNTos-model) has been developed, basically capable of simulating the morphological evolution of the Dutch coast at the above-mentioned spatial and temporal scales. This present paper focuses on the theoretical background of the model. The results of a preliminary application of the model for the closed coastal section of the Dutch coast between Hoek van Holland and Den Helder are also presented. The actual PONTos-model is based on the multi-layer concept, in which the crossshore profile is schematised as a number of mutually coupled layers, defined between fixed profile depths. These layers interact through cross-shore transport. In longshore direction the layers respond to gradients in the longshore transport generated at the profile regions they represent. The main input of the model, to be provided by the user, are the characteristics of the coastal stretch to be studied, including the initial positions of the various layers and offshore hydraulic conditions in terms of wave and tidal climate tables. On the basis of these data the yearly-averaged sediment transport pattern is computed and finally used for the assessment of the coastal evolution.