Numerical Analysis of Tidal Circulation for Long Beach Harbor. Report 4. Tidal Circulation Velocity Patterns for Existing Conditions and Alternate Master Plan Pier-J Configurations with -82-ft Channel.

摘要

A study was conducted for Long Beach Harbor to numerically investigate tidal circulation in existing basins and to define and evaluate the impact of possible modification of Pier-J with a -82-ft entrance channel on existing harbor circulation. A two-dimensional depth-averaged formulation of the hydrodynamic equations was used in the model and an implicit-explicit finite difference scheme was used to numerically solve the equations. The numerical model was verified using prototype tide and velocity data and tide and velocity data from physical model tests conducted at WES. Details of the numerical investigation are presented in reports 1 and 3 of this series. This report presents vector plots of the tidal circulation patterns at four times during the tidal cycle for existing conditions and for four modifications to Pier-J. In addition, tidal circulation patterns for each modification are compared with circulation patterns for existing conditions. Vector plots are presented indicating the extent and magnitude of velocity changes produced by each modification. In both sets of vector plots the direction of the vector indicates the direction of current flow and the length indicates the magnitude of the current velocity. The four vector plots of tidal circulation pattern for each Pier-J configuration correspond to flow conditions near: Slack water (hour 15); Maximum flood (hour 19); Slack water (hour 22); and Maximum ebb (hour 24).