Shijie Huang, PhD Candidate Department of Ocean and Resources Engineering University of Hawaiʻi at Mānoa Location Information **This seminar will be held both in person (Watanabe Hall 112) and over Zoom** Meeting ID: 961 6222 2366 Passcode: OREseminar https://hawaii.zoom.us/j/96162222366 Devastating tsunami waves can mobilize a substantial amount of coastal sediments, causing significant morphological changes to the coastline. To understand the underlying hydrodynamics and sediment transport mechanisms associated with tsunami waves, a three-phase (air, water, and sediment) flow Computational Fluid Dynamics (CFD) model based on OpenFOAM was used to simulate the beach erosion induced by breaking tsunami-like waves. In this talk,
Seminar: Fundamentals of Collision and Constraint Dynamics: Review and Potential Applications in Ocean Engineering
Albert S. Kim Professor and Graduate Chair Department of Civil and Environmental Engineering University of Hawai’i at Mānoa Hydrodynamic impacts and interactions between fluid flow and solid objects–both moving and stationary–are of great importance in various engineering disciplines from nano- to ocean-scale phenomena. These processes include aggregate/aggregation dynamics of sub-micron particles (as point masses), granular dynamics (as inelastic bodies of finite volumes) for pharmaceutical manufacturing processes and sediment transport in ocean engineering, and classical dynamics of rigid bodies as big as vehicles and shipping containers. Although the collision and constraint dynamics applications have vast length-scale ranges, the principles and
MS Plan A Defense: Morphodynamic changes due to calm-moderate wave forcing: A case study of Waikiki Beach
Julianne Kalksma Graduate Student Department of Ocean and Resources Engineering University of Hawaiʻi at Mānoa Sea level rise, erosion, and the wave climate influence Waikiki Beach on the South Shore of Oahu which is a popular beach in metropolitan Honolulu. In response to recent erosion events and ongoing beach nourishments, weekly surveys have been collected for the past 3 years, from April 2018 through December 2020, to better understand coastal morphology. Local studies found detailed two-dimensional morphological structures; however, no direct relationships between the offshore driving ocean conditions and Waikiki Beach have been established. Other previous works relate the wave
Seminar: Wave runup, forecasting, and enhanced observations with a drone-mounted LiDAR
Julia Fiedler, PhD Postdoctoral Scholar Scripps Institution of Oceanography University of California San Diego Storm wave run-up causes beach erosion, wave overtopping, and street flooding. Extreme runup estimates may be improved, relative to predictions from general empirical formulae with default parameter values, by using historical storm waves and eroded profiles in numerical runup simulations. For use in a local flood warning system, the relationship between incident wave energy spectra E(f) and SWASH-modeled shoreline water levels is approximated with the numerically simple integrated power law approximation (IPA), wherein broad and multi-peaked E(f) are accommodated by characterizing wave forcing with frequency-weighted integrals
Seminar: Sustainable Hard and Soft Measures for Coastal Protection
Dr. V. Sundar Professor Emeritus Department of Ocean Engineering Indian Institute of Technology Madras, India Any stretch of a coastline warrants protection measure when it experiences an erosion rate beyond a threshold value, and when the seasonal sediment transport/littoral drift changes fail to restore equilibrium. The causes for coastal erosion can either be natural, man-made or a combination of both. The natural causes include extreme storm events, action of waves on the coasts, Sea level rise due to climate change, etc. The man-made causes are often related to developmental activities such as construction of ports, fishing harbours, structures for wave
Seminar: Modifying the Seafloor to Study Surf-Zone Dynamics: Breaking Waves, Rip Currents, and Shifting Sandbars
Dr. Melissa Moulton Research Scientist/Engineer Applied Physics Laboratory University of Washington, Seattle The surf zone is the boundary between land and the open ocean. In the surf zone, ocean waves refract, steepen, and break, driving strong currents and transporting sand, biota, and pollutants along the coast and between land and sea. Improving our knowledge of these processes is important for making better predictions of flooding, erosion, swimmer hazards, and storm impacts on infrastructure and ecosystems. Previous work has used numerical and laboratory models, which may lack important physics, and passive observations in the field, where it is difficult to isolate individual
Seminar: A wave-flume study of scour at a pile breakwater: solitary waves
Conghao Xu Recipient of the ORE Outstanding Student Award, University of Hawai’i Understanding the sediment transport and the resulting scour around coastal structures such as piles under local extreme conditions is important for the stability of foundations of various coastal structures. As a part of combined experimental and multi-phase numerical study of scour around coastal pile structures, this study reports a waveflume experiment investigating the scour at a pile breakwater, which consists of a row of closely spaced piles. Solitary waves were considered in this study. A simple procedure in the experiment was introduced to eliminate possible multiple reflection of