Formation and Evolution of Sediment Waves: Integration of Quantitative Modeling and Field Observations

沉积波的形成和演化：定量建模和现场观测的结合

• 批准号: 1061300
• 负责人: Eckart Meiburg
• 金额: $ 29.99万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1061300&HistoricalAwards=false
• 关键词: Formation; Evolution; Sediment; Waves; Integration

The proposed research will extend a recently developed framework for analyzing flow/sediment bed interactions to bottom currents, debris flows and tsunamis. Differences with regard to wave orientation relative to flow direction and slope, up and downstream symmetry, direction of migration etc. will be compared in detail to corresponding field observations, in order to draw conclusions about the genesis of specific sediment wave fields. The framework for conducting both linear stability analysis and nonlinear simulations is based on the full three-dimensional Navier-Stokes equations, rather than the depth-averaged shallow water equations most commonly employed to date. A new Ph.D. post-doc will do most of the work in collaboration with the PI. The PI hopes that the proposed research will elevate the description of sediment wave formation from largely qualitative arguments to advanced, quantitative models on which we can base rigorous linear stability analyses as well as fully nonlinear simulations. In this way, it will enable us to distinguish between sediment waves generated by turbidity and bottom currents, debris flows and tsunamis, so that different sediment wave fields can be classified according to their mechanism of generation.Broader impact: Stated broader impacts include support of quantitative, engineering-based modeling approaches within the earth science community. The work has relevance to the mission of the NSF-sponsored Community Surface Dynamics Modeling System (CSDMS). The project will also support a graduate student, as well as undergraduates and outreach to high school students.

拟议的研究将扩大最近开发的框架，用于分析底流，泥石流和海啸的流动/沉积物床的相互作用。将详细比较与流向和坡度、上游和下游对称性、迁移方向等相关的波向差异与相应的现场观测结果，以便得出关于特定沉积物波场成因的结论。进行线性稳定性分析和非线性模拟的框架是基于完整的三维Navier-Stokes方程，而不是迄今为止最常用的深度平均浅水方程。新博士博士后将与PI合作完成大部分工作。PI希望，拟议的研究将提升沉积物波形成的描述，从主要是定性的参数，先进的定量模型，我们可以基于严格的线性稳定性分析以及完全非线性模拟。通过这种方式，它将使我们能够区分浊流和底流，泥石流和海啸产生的沉积物波，使不同的沉积物波场可以根据其生成机制进行分类。更广泛的影响：所述的更广泛的影响包括支持地球科学界的定量，基于工程的建模方法。这项工作与NSF赞助的社区表面动力学建模系统（CSDMS）的使命有关。 该项目还将支持一名研究生、本科生和高中生。