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Title: Los Angeles and Long Beach harbors model study : Deep-Draft Dry Bulk Export Terminal, alternative no. 6: resonant response and tidal circulation studies
Authors: United States. Army. Corps of Engineers. Los Angeles District
Seabergh, William C.
Keywords: Harbors--California
Los Angeles (Calif.)--Harbor
Long Beach Harbor (Calif.)
Hydraulic models
Tidal currents --California
Deep-Draft Dry Bulk Export Terminal
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; CERC-85-8.
Description: Miscellaneous paper
Abstract: Studies to determine the effect of the proposed Deep-Draft Dry Bulk Export Terminal, Alternative No. 6, on tidal circulation and harbor resonance in Los Angeles and Long Beach Harbors were conducted. The plan included a total of 448 acres of landfill in Los Angeles Harbor and dredging a navigation channel and maneuvering area. The effect of the proposed plan on tidal circulation was studied using an implicit-finite difference scheme numerical model with a two-dimensional depth-averaged formulation of the hydrodynamic equations. Tidal circulation was simulated for 70-hr sequences of spring, mean, and neap tides for existing and proposed plan conditions. Tidal elevations, velocities, discharges, flow volumes, net flow volumes, and dye concentrations were examined throughout the harbors. The plan produced no changes in tidal elevation or phase throughout the harbors. Only very slight changes occurred in flow distribution through the three main entrances to the harbors. Net easterly circulation in the outer harbor was reduced 21 to 24 percent. Net circulation in the inner harbor (Main Channel and Cerritos Channel) was reversed from the existing westerly flow to a net easterly flow of gr eater magnitude than for existing conditions, providing improved flushing of the inner harbor. Dye tests indicated no change in concentration in the shallow-water habitat for the plan when compared with existing conditions. Harbor resonance for the plan was examined with a 1:400 horizontal,1: 100 vertical scale model of Los Angeles and Long Beach Harbors, and the results were compared with resonant response for existing conditions. Wave periods ranging from 15 to 400 sec were tested. The study produced results showing wave height amplification factors at 46 locations throughout the harbors. Testing indicated that for the proposed terminal locations along the island landfill and on Terminal Island the resonant peaks were relatively low. The 185-sec period wave produced the greatest wave height amplification of 5.1, but only at one location along Terminal Island. A 330-sec wave produced the only significant wave amplification (5.4) the outer (or south) face of the island landfill. No significant resonant peaks were created at other locations throughout the harbors due to the plan except for a few very long periods (320 sec) at only a few locations. Some of the larger resonant peaks for existing conditions were reduced.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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