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Multi-dimensional Intra-wave Modelling of coupled Sediment transport and Turbulence (MIMST)

耦合沉积物输运和湍流的多维波内建模 (MIMST)

基本信息

批准号：
NE/J004499/1
负责人：
Laurent Amoudry
金额：
$ 10万
依托单位：
NATIONAL OCEANOGRAPHY CENTRE
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FJ004499%2F1
关键词：
Multi dimensional Intra wave Modelling

项目摘要

The movement of sediment is a key part of coastal dynamics and it has relevance to many physical, chemical, biological and ecological processes. Computer modelling approaches are an important tool for coastal zone management and to predict the response of coastal systems to changing environmental conditions. The models used must be grounded in sound physical understanding of sediment processes and offer proven predictive abilities. They can only be as good as the representation of the underlying physical processes, which is commonly blamed for the still limited predictive power of coastal-scale physically-based models. In particular, mixing near the sea bed greatly affects the transport of matter and a good description of near-bed turbulence is crucial to accurately describe sediment transport. The available evidence shows that near-bed turbulence is still poorly predicted for wave flows over ripples in coastal ocean models. The key issues are then to determine which processes are responsible for the poor predictions, and how they can be better represented. In the MIMST project, we propose to use computer modelling techniques to significantly increase our understanding of near-bed turbulence and sediment transport over rippled beds. We will combine computer simulations with rigorous comparisons against existing high-quality experimental data. This approach will enable us to develop and carefully validate a new coupled wave hydrodynamics, turbulence, and sediment transport model. The resulting model will be able to provide more information on small-scale turbulent and sediment processes than experiments presently can. In turn, we will use the new fine-scale numerical results to assess and improve the current representation of near-bed turbulence and sediment transport over rippled beds in coastal-scale models. By combining observations and advanced numerical modelling, the project will provide a firm scientific foundation for understanding complex unresolved physical processes occurring near the sea bed. It will allow better predictions of coastal responses to changes in environmental forcing. The project builds on studies of the interaction between wave hydrodynamics and structures, and it will then allow predictions of the impact of man-made structures on sediment dynamics, and vice versa.

泥沙运动是海岸动力学的重要组成部分，它与许多物理、化学、生物和生态过程有关。计算机模拟方法是沿海区管理和预测沿海系统对不断变化的环境条件的反应的重要工具。所使用的模型必须基于对沉积过程的合理物理理解，并提供经证实的预测能力。它们只能像基本物理过程的代表一样好，这通常被归咎于海岸尺度物理模型的预测能力仍然有限。特别是，海底附近的混合极大地影响了物质的输运，良好的近床湍流描述对于准确描述沉积物输运至关重要。现有的证据表明，近床湍流仍然是很差的预测波流在沿海海洋模式的涟漪。然后，关键问题是确定哪些过程是导致预测不佳的原因，以及如何更好地表示它们。在MIMST项目中，我们建议使用计算机模拟技术，以显着增加我们的理解近床湍流和沉积物输运的波纹床。我们将结合联合收割机的计算机模拟与严格的比较，对现有的高质量的实验数据。这种方法将使我们能够开发并仔细验证新的耦合波浪流体动力学、湍流和沉积物输运模型。由此产生的模式将能够提供更多的信息，小规模的湍流和泥沙过程比目前的实验可以。反过来，我们将使用新的细尺度数值结果，以评估和改善目前的代表性近床湍流和沉积物输运在海岸尺度模型中的波纹床。通过将观测和先进的数值模拟相结合，该项目将为了解海床附近发生的复杂的未解决的物理过程提供坚实的科学基础。它将有助于更好地预测沿海地区对环境强迫变化的反应。该项目以波浪流体动力学和结构之间相互作用的研究为基础，然后将能够预测人造结构对沉积物动力学的影响，反之亦然。