SGER: The Effect of Katrina on Submerged Geotechnical Systems - Underwater Evaluation of Sediment-Structure-Storm Interaction

卡特里娜飓风对陆地造成的破坏是不言而喻的，其基本机制也很容易研究。然而，离岸损害往往是未知的，即使其影响在水面上很明显- -如桥梁部分倒塌的情况- -由于缺乏离岸数据，沉积物-结构-风暴相互作用的潜在过程也不能得到适当的分析。该项目将使用声纳/海底剖面仪对沉积物-水界面和次表层进行成像，以前所未有的方式深入了解桥梁基础、管道、锚、墙和堤防、侵蚀和再沉积沉积物附近的沉积物运输和沉积物系统相互作用。这些信息可以用来识别和评估海上风暴期间的失效机制。该提案的成功完成将提供基本的海上数据，以帮助发展以下更广泛的影响：o由各个领域的研究人员，从地质力学家和沉积学家，到港口和桥梁工程师和地球物理学家，生成沉积物-结构-风暴相互作用的分析和数值模拟；o向其他研究人员发放资料，各研究机构会透过其网站提供资料；o将教学模块中的数据文件通过地质与工程研究中心提供给岩土工程界；o在威斯康星大学麦迪逊分校和佐治亚理工学院的pi课程中实施/分析数据，包括土壤行为、应用地球物理学、信号处理、反问题和波传播。

ABSTRACT The onshore damage caused by Hurricane Katrina is self-evident and fundamental mechanisms can be readily studied. However, offshore damage is often unknown, and even when its effects are evident above water - as in the case of collapsed bridge segments - the underlying processes that are the result of sediment-structure-storm interaction cannot be properly analyzed in the absence of offshore data. This project will use sonar/sub-bottom profiler imaging of the sediment-water interface and subsurface layers to gain unprecedented insight into sediment transport and sediment-system interaction near bridge foundations, piping, anchors, walls and embankments, erosion and redeposited sediments. This information can then be used use to identify and assess offshore failure mechanisms during storms. The successful completion of the proposal will provide basic offshore data to help developing the following broader impacts:o generation of analytical and numerical simulations of sediment-structure-storm interaction by researchers in various fields, from geomechanicians and sedimentologists, to port and bridge engineers and geophysicists;o dissemination to other researchers, the PIs will make the data available through their websites;o documentation of data in teaching modules to be made available to the geotechnical community through USUCGER;o implementation/analysis of data in PIs' courses that include soil behavior, applied geophysics, signal processing, inverse problems, and wave propagation, both at the University of Wisconsin-Madison and at Georgia Tech.