OSCILLATIONS OF SEMI-ENCLOSED WATER BODY INDUCED BY HURRICANES

Paul Yuan-Hung Tan, Jiin-Jen Lee

Abstract


The primary focus of this research is to study the oscillations of semi-enclosed water body induced by hurricanes. The physical mechanisms of the wind-induced oscillation (storm surge) in a semi-enclosed water body are analyzed by the depth-averaged, non-linear shallow-water equations. The numerical model using the finite-volume method (FVM) to solve the depth-averaged, non-linear shallow-water equations is developed and the present model is verified by the intensive field data reported by IPET. The present model is further applied to the investigation of the oscillations (storm surges) in Lake Pontchartrain induced by the winds generated by four synthetic hurricanes within the time-span of 00:00 UTC August 29 to 00:00 UTC August 30, 2005: 1.Hurricane Katrina tracking on its original route, 2.Hurricane Katrina tracking 36 km west of its original route, 3.Hurricane Katrina tracking 72 km west of its original route, and 4.Hurricane Katrina tracking on its original route with reduced forward speeds. The major application of the present model is to assist the design of the water-front structure surrounding the semi-enclosed water body that has been influenced by the oscillations induced by hurricanes. The numerical simulations generated by the present model can help the planners to determine a better strategy of the hurricane protection systems surrounding the communities of the semi-enclosed water body.

Keywords


oscillation; hurricane; depth-averaged, non-linear shallow-water equations; finite-volume method; risk-based design & analysis

References


Ferziger, J., Peric, M. 2002. Computational Methods for Fluid Dynamics, 3 rd ed.. Springer-Verlag Berlin Heidelberg New York.

Interagency Performance Evaluation Task Force (IPET) 2006. Performance Evaluation of the New Orleans and Southeast Louisiana Hurricane Protection System. U.S. Army Corps of Engineers.

Tan, W. 1992. Shallow Water Hydrodynamics. Elsevier Science Publishers, The Netherlands.

Tung, Y. K. 2002. Key Lecture: Risk-Based Design of Flood Defense Systems. Flood Defense 2002, 71-81.


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