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.


    Access

    Download


    Export, share and cite



    Title :

    Los Angeles and Long Beach Harbors Model Study : Numerical Analysis of Tidal Circulation for the 2020 Master Plan



    Published in:

    Publication date :

    1984


    Size :

    22478119


    Type of media :

    Report


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :


    Los Angeles and Long Beach Harbors additional plan testing : numerical modeling of tidal circulation and water quality

    Vemulakonda, S. Rao / Chou, Lucia W. / Hall, Ross W. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1991

    Free access

    Los Angeles and Long Beach Harbors Model Enhancement Program: three-dimensional numerical model testing of tidal circulation

    Port of Long Beach. ;Port of Los Angeles. ;United States. Army. Corps of Engineers. Los Angeles District. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1990

    Free access

    Los Angeles and Long Beach Harbors Model Study. Report 5: Tidal Verification and Base Circulation Tests

    McAnally, William H. Jr. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1975

    Free access

    Los Angeles and Long Beach Harbors Model Enhancement Program, Effects of Wind on Circulation in Los Angeles-Long Beach Harbors

    Seabergh, William C. / Vemulakonda, S. Rao / Chou, Lucia W. et al. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1994

    Free access

    Ports of Long Beach / Los Angeles Transportation Master Plan

    Cartwright, Kerry / Cottrill, Larry / Hamrick, Gary et al. | ASCE | 2001