EAGER: Developing and Testing Algorithms for Generating Leading Tsunami Waves

EAGER：开发和测试生成领先海啸波的算法

• 批准号: 0960512
• 负责人: Philip Liu
• 金额: $ 5万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0960512&HistoricalAwards=false
• 关键词: EAGER; Developing; Testing; Algorithms; Generating

During the last forty years, solitary waves have been used as surrogate leading tsunami waves in laboratory studies. The data taken from the 2004 Indian Ocean tsunamis, however, show that the length and time scales for the solitary wave are too small in comparison with those of real tsunamis. This discovery poses a fundamental challenge for the tsunami research community, who currently interpret the existing results based on solitary wave theory. More importantly, this points to the need to investigate the feasibility of generating adequate long waves in a laboratory facility for laboratory research. Intellectual Merit: This research will use the newly installed wave makers with long strokes at Cornell University and the NEES tsunami facility at Oregon State University to test the hypothesis that the leading tsunami wave does not have sufficient time and distance to evolve into a solitary form, therefore challenging the currently used modeling approach for wave runup and other physical quantities based on the solitary wave. Since both wave makers are new, investments need to be made to develop algorithms for generating properly scaled leading tsunami waves. The critical question is to demonstrate if the wave length and wave period estimated by current solitary wave theory agree with recent field observations. Therefore, this research is timely and potentially transformative. The objectives of the research are as follows: (1) investigate and formulate the shape of characteristic leading tsunami waves, and (2) create and implement algorithms for generating desirable leading tsunami wave forms in both the Cornell and Oregon State wave flumes. This research has high risk but potentially high impact. If the research is successful, it has far-reaching implications on future tsunami laboratory research directions and community modeling approaches, including those of the NEES tsunami facility. Most of the laboratory results obtained in the past and their applications would need to be reevaluated. One reason that the solitary wave has been used in the past as the surrogate for the leading tsunami wave in laboratory studies for runup and wave force is that most existing wave flume facilities cannot generate the very long waves that represent leading tsunami waves. However, the new wave makers at both Cornell and the Oregon State tsunami wave facility now have the long stroke capacity to generate very long waves and test this hypothesis, and these two facilities complement each other in terms of range of applicable parameters. Broader Impacts: Successful achievement of the objectives of this research could lead to the following broader impacts. First, if the hypothesis is proven, then the 2004 Indian Ocean tsunamis clearly demonstrate that leading tsunami waves cannot be accurately represented by solitary waves in the laboratory, and new research directions and laboratory capabilities will be required for the field. Second, this project will utilize Oregon State University's Tsunami Experiment Databank and Notebook to capture and make all experimental data publicly available, as well as archiving all data in the NEES data repository, for reuse by future researchers. Third, a new piston wave maker was installed in Oregon State University's NEES Large Wave Flume, acquired through a recent NSF Major Research Instrumentation (MRI) award, and became operational in spring 2009. This award will expand the capabilities of that wave flume facility through the algorithm developed to generate very long waves through modification of the software that drives the hydraulic actuator assembly.

在过去的四十年中，在实验室研究中，孤立波被用作替代海啸。然而，从2004年印度洋海啸中获取的数据表明，与真实海啸相比，孤立波的长度和时间尺度太小。这一发现对海啸研究界构成了根本挑战，他们目前基于单独的波浪理论来解释现有结果。更重要的是，这表明需要研究在实验室设施中产生足够长的长波进行实验室研究的可行性。 知识分子的优点：这项研究将使用康奈尔大学（Cornell University）和俄勒冈州立大学的NEES海啸设施的新安装的波浪制造商来测试以下假设：领先的海啸波浪没有足够的时间和距离来发展成孤立的形式，从而挑战了当前使用的模型型模型和其他基于索尔索尔的模型。 由于两个波浪制造商都是新的，因此需要进行投资，以开发算法来产生正确规模的领先海啸波。 关键的问题是证明通过当前孤立波理论估计的波长和波周期是否与最近的现场观测一致。 因此，这项研究是及时且潜在的变革性的。 研究的目标如下：（1）研究和制定特征性领先海啸波的形状，（2）创建和实施算法，用于在康奈尔州和俄勒冈州波浪中生成理想的领先海啸波形。这项研究具有高风险，但潜在的影响很高。如果这项研究成功，它对未来的海啸实验室研究方向和社区建模方法（包括NEES海啸设施的）具有深远的影响。 过去获得的大多数实验室结果需要重新评估。 在过去的实验室研究中，过去已经将孤立波用作领先海啸波的代替代的原因之一是，大多数现有的波浪水槽设施无法产生代表领先海啸波的非常长的波浪。 但是，康奈尔州和俄勒冈州海啸波动设施的新波浪制造商现在具有长时间的中风能力，可以产生很长的波浪并检验这一假设，而这两个设施在适用参数范围内相互补充。更广泛的影响：成功实现这项研究的目标可能会带来以下更广泛的影响。 首先，如果证明了该假设，那么2004年印度洋海啸清楚地表明，领先的海啸波不能由实验室中的孤立波准确地表示，并且该领域将需要新的研究方向和实验室能力。其次，该项目将利用俄勒冈州立大学的海啸实验数据库和笔记本来捕获和使所有实验数据公开可用，并归档NEES数据存储库中的所有数据，以便未来的研究人员重复使用。 Third, a new piston wave maker was installed in Oregon State University's NEES Large Wave Flume, acquired through a recent NSF Major Research Instrumentation (MRI) award, and became operational in spring 2009. This award will expand the capabilities of that wave flume facility through the algorithm developed to generate very long waves through modification of the software that drives the hydraulic actuator assembly.