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TABS-2 Application to Kawainui Marsh Flood Control

by Gary Freeman, U.S. Army Engineer Waterways, Experiment Station, Vicksburg, United States,
Lisa Weissinger, U.S. Army Engineer Waterways, Experiment Station, Vicksburg, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The TABS-2 mathematical modeling system was used to evaluate the effectiveness of alternatives designed to eliminate flooding problems in the Kawainui Marsh located in Kailua on the east side of the island of Oahu, Hawaii. The study required unique applications of the TABS-2 modeling system. The verification required altering the numerical code to model free flow over the existing Federally constructed flood control levee which overtopped during the 31 December 1987 storm event and caused extensive damage to the community of Coconut Grove. One of the alternative plans consisted of placing a series of 15 culverts in the existing levee in order to drain the marsh floodwaters into an extension of the Oneawa channel and release them into the Pacific Ocean. This alternative required the addition of culvert modeling capability to the TABS-2 numerical code. These two applications were further exacerbated by the requirement to use dynamic flow simulations in order to accurately model the effects of various hydrographs. The modeling techniques employed and various model results are presented.

Subject Headings: Numerical models | Mathematical models | Floods | Computer models | Simulation models | Hydrologic models | Flow simulation | Hawaii | United States | Pacific Ocean

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