School of Civil and Environmental Engineering

1. School of Civil and Environmental Engineering River Ice Process and Modeling Prof Hung Tao Shen Department of Civil and Environmental Engineering Clarkson University, USA In cold regions, ice formation will affect all hydraulic and transport phenomena in rivers and the management of water resources. River ice process involves complex interactions between fluid, thermal, granular, and solid mechanics. River ice research has advanced significantly in the last thirty years from empirical and engineering approaches to the development of theories, analytical framework, and computer models. This presentation will give a brief overview on the evolution of river ice in the winter, the progress on river ice research, and the development and applications of river ice models. Wave and Sea Ice Interaction Prof Hayley H. Shen Department of Civil and Environmental Engineering Clarkson University, USA Arctic ice reduction is a well-known consequence of climate change. The opening up of this previously inaccessible region will bring economic opportunities and unknown ecological and environmental impacts. Increased open water area enhances wind fetch and thus the wave intensity. The escalation of waves in the Arctic has unforeseen effects on the formation and decay of sea ice. In this talk we will discuss the physical processes involved in wave and ice interactions. We then examine the mathematical modeling of these processes and the resulting phenomena discovered from these studies. You are cordially invited... For more information • Email: ExecDir-NEWRI@ntu.edu.sg • Tel (65) 6790 6813 • Fax: (65) 6791 0756 • Website: www.ntu.edu.sg/NEWRI

2. About the speakers: Prof Hung Tao Shen Hung Tao Shen is the Associate Dean for Research and Graduate Studies, Coulter School of Engineering at Clarkson University. He obtained his Ph.D. degree from University of Iowa in Mechanics and Hydraulics in 1974 and joined the faculty of Clarkson University in 1976. Since then he has made contributions to various topics in river ice, including the development of the transport capacity theory for frazil ice jams (hanging dams), and the theory on dynamic ice transport and ice jams. Motivated by the need of a coherent analytical framework for river ice processes and the value of mathematical models, he and his research group has developed comprehensive computer models for river ice processes. These models have been applied to rivers in different countries. In addition to cold regions hydraulics, he has introduced the Lagrangian mesh-free method to model hydraulic and transport processes, including oil spills and chemical transport models in rivers and lakes. Hung Tao served as the editor of the ASCE Journal of Cold Regions Engineering from1997 to 2002. He is a recipient of many prestigious awards for his outstanding contributions to ice and hydraulic engineering, including the 2000 ASCE Harold R. Peyton Cold Regions Engineering Award, the 2000 ASCE CAN-AM Civil Engineering Amity Award , the 2007 ASCE Hunter Rouse Hydraulic Engineering Award, and the IAHR Ice Research and Engineering Award in 2008. Prof Hayley H. Shen Hayley H. Shen is the Professor of Civil & Environmental Engineering at Clarkson University. She obtained her Ph.D. degree from University of Iowa in Applied Mathematical Sciences in 1976 and Ph.D. degree from Clarkson University in Engineering Sciences in 1982. Her research includes: (a) developing constitutive laws for inertia-dominated regimes and its evolution to contact-force-dominated regimes; (b) applying DEM to particle shape effects in dilute and dense systems, including the effect of grain properties on system rheology; (c) expanding to two-phase mixtures and coupling with computational fluid dynamics techniques to pipe flows; (d) Including electrostatic forces and molecular bonding force to simulate lunar regolith and macro-molecules; (e) determining the transitional rheology between solid and fluid behavior; (f) developing a floe collision based on constitutive law; and (g) studying theoretically and through laboratory and numerical experiments the wave effect on pancake ice formation, limiting size and rafting thickness, and wave attenuation rate in a grease-pancake ice field. Free Admission Date: 02 Feb 2012 (Thursday) Time: 2.00pm – 4.00pm Venue: CEE Seminar Room A, N1-B1B-06