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Title: Los Angeles and Long Beach Harbors model study : Numerical analysis of tidal circulation for the 2020 Master Plan
Authors: United States. Army. Corps of Engineers. Los Angeles District.
Seabergh, William C.
Outlaw, Douglas G.
Keywords: Harbors--Hydrodynamics
Los Angeles (Calif.)--Harbor
Long Beach (Calif.)--Harbor
Tidal currents
Mathematical models
2020 Master Plan
Publisher: Coastal Engineering Research Center (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; CERC-84-5.
Description: Miscellaneous paper
Abstract: A study to determine the effect of the proposed 2020 Master Plan on tidal circulation in Los Angeles and Long Beach Harbors was conducted using a numerical model with a two-dimensional depth-averaged formulation of the hydrodynamic equations. The model, which had been verified in a previous study, used an implicit finite-difference scheme to numerically solve the equations. To observe the dispersion of conservative substances, the model also incorporated the two dimensional conservative constituent transport equations. The 2020 Master Plan consists of placing 2600 acres of landfill at various locations throughout the harbors. Tidal circulation was studied for 70-hr sequences of spring, mean, and neap tides for each of three harbor configurations: (1) existing configuration (1983), (2) landfills placed on existing bathymetry, and (3) landfills placed with increased channel depths. The 2020 Master Plan produced no changes in tidal elevation or phase throughout the harbors. The tidal prism was reduced by the amount of displacement of the landfill. Flow distribution entering and exiting the harbor through Angel's Gate, Queen's Gate, and the east end were not significantly affected. The net flow in the inner harbor (Main Channel and Cerritos Channel) was reversed from the existing westerly flow to an easterly flow; however, the net flow volumes for both existing and planned conditions were small relative to the total flow volumes. Channel deepening combined with the 2020 Master Plan reduced large horizontal eddies in the outer harbor, permitting more efficient flow into the inner harbor area from Angel's Gate to the Main Channel. Dye tests indicated good flushing and mixing in the outer harbor.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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