Tsunami-Induced Sediment Transport and Scour

:SPEAKER:Yin Lu (Julie) YoungCivil & Environmental Engineering Department
Princeton University:ABSTRACT:As demonstrated by the 2004 Indian Ocean Tsunami, high intensity wave runup and drawdown can mobilize substantial amount of sediment deposits. The resulting erosion and scour damage can undermine building foundations, roadways, sea walls, embankments, and may even lead to eventual collapse of the coastal structure. In this seminar, we will focus on the numerical and experimental analysis of tsunami-induced sediment transport. We will talk about the development and validation of the numerical model, including the effect of wave breaking, dispersion, and interaction with sediments and underlying soil layer. In addition, we will also talk about two sets of experiments to be conducted this year to examine the complex physics and various scaling effects of tsunami-induced sediment transport. The first experimental study focuses on the effect of enhanced transport due to pore pressure gradients, and will be conducted at the 30-ft long flume in the hydraulics lab at the University of Hawaii using multiple grain sizes. The second experimental study focuses on tsunami-induced sediment transport, and will be conducted at the 160-ft long tsunami wave basin at Oregon State University using fine Oregon beach sand. The experimental setups are shown, and scaling issues for the two movable bed physical models are discussed. Comparisons of the differences and similarities in transport mechanisms for tsunami cross-shore environment and river-type environment are presented.:SHORT BIOGRAPHY:Julie Young received her B.S. from University of Southern California in 1996, where she did research on shear-band failure of soil particles under Prof. J.P. Bardet. She then went on to the University of Texas at Austin (UT Austin) to get her M.S. degree (1998) under Profs. J. Roesset and K. Stokoe II on numerical modeling and SASW testing of stress-induced anisotropy of soil surrounding a borehole. Julie stayed in UT Austin for her PhD degree, where she studied under Prof. S. Kinnas on numerical modeling of the cavitating marine propellers. Since 2002, she is an Assistant Professor at the Department of Civil and Environmental Engineering at Princeton University. In 2005, Julie received both the ONR Young Investigator Award and the Rheinstein SEAS Junior Faculty Award. Her current active research areas include multiphase modeling (sediment transport, porous flows, and bubbly flows) and fluid-structure interaction modeling (tsunami-sediment-soil interactions and hydroelastic tailoring of composite structures).

Location: Kaprielian Hall (KAP) - -203

Audiences: Everyone Is Invited

Contact: Masako Okamoto