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An Integrated Data-Driven Modeling System to Study and Predict the Circulation, Productivity and Climate of the Red Sea

Speaker: Ibrahim Hoteit
[Announcement (PDF)]

Speaker Affiliation: Associate Professor,
Earth Sciences and Engineering,
Applied Mathematics & Computational Science,​​​​​​​​
King Abdullah University of Science and Technology,
Saudi Arabia
Date: Monday June 5, 2017 at 2 p.m in 5-314

The talk will present the integrated data-driven modeling and forecasting system that we have developed to study and understand the physical and biological variability of the Red Sea. I will first describe the modeling system and summarize our key findings on the Red Sea general circulation, including the striking seasonally overturning circulation, the dominant eddy activity, and the occasional northern deep water formation events, and discuss their impact on the Red Sea ecosystem. I will then focus on our efforts to develop an efficient ensemble data assimilation and forecasting system for the Red Sea, presenting recent algorithmic developments and results, and discussing our future plans. 

Objective Eulerian Coherent Structures in Fluids

Speaker: George Haller
[Announcement (PDF)]

Speaker Affiliation: Professor of Nonlinear Dynamics
Institute for Mechanical Systems
ETH Zurich
Zurich, Switzerland

Date: Tuesday January 24, 2017 at 11 a.m in 5-314

Short-term variability in coherent features of unsteady fluid flows is  of prime interest in fields ranging from flow control through environmental assessment to search and rescue operations. Available methods for the identification of the instantaneously most influential flow structures, however, are generally  frame-dependent and heuristic, which limits the reliability of the results they provide.  In this talk, we discuss a rigorous global variational theory of objective Eulerian Coherent Structures (OECSs), which uncovers the correct instantaneous material skeleton of an unsteady fluid  flow in a frame-invariant fashion.  We show applications to detecting unsteady  flow structures objectively in satellite-based and radar-inferred ocean surface velocity fields. We find that these structures remain generally hidden to traditional, non-objective Eulerian flow analysis.