1. ERDC Knowledge Core
2. Pre - Engineer Research and Development Center (ERDC)
3. Hydraulics Laboratory - (8/1/1972 - 9/1996)
4. Publication
5. Technical Report

Title:	Los Angeles and Long Beach Harbors model study. Report 1, Prototype data acquisition and observations
Authors:	United States. Army. Corps of Engineers. Los Angeles District Pickett, Ellis B. Durham, Donald L. (Donald Lee) McAnally, William H.
Keywords:	Harbors Ship motion Hydraulic models Tides Long Beach Harbor (Calif.) Water currents Los Angeles Harbor Water waves Prototype data Ports Harbors California
Publisher:	Hydraulics Laboratory (U.S.) Engineer Research and Development Center (U.S.)
Series/Report no.:	Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-75-4 rept.1.
Description:	Technical Report Abstract: This report describes the instrumentation, operation, calibration, and collected data of a 1-yr prototype wave, tide, and ship movement data acquisition program conducted by the U.S. Army Engineer Waterways Experiment Station and is the first of a series to be published under the general title "Los Angeles and Long Beach Harbors Model Study." This model study has four major objectives : (1.) to determine incidence and severity of troublesome oscillations in the present harbor complex, (2.) to investigate tidal circulation characteristics of the present and proposed harbors, (3.) to determine the optimum plan for future expansions to provide safe and economical berthing areas, and (4.) to analyze the effect proposed expansions will have on existing harbors. The first two objectives require very accurate and reliable prototype data. From 1 June 1971 to 1 July 1972, wave data were obtained at 1-sec intervals from 13 wave gage stations at selected locations in the Los Angeles and Long Beach Harbors. Barometric pressure was monitored at the central receiving station onshore. In addition to wave data from pressure transducers, tidal height data were obtained from three float-type tide gages operated by the Los Angeles and Long Beach Port Authorities. For 15 stations in the harbors, tidal current measurements at three depths in the water column were collected at 1-hr intervals for a 25-hr observation period beginning at 0600 PDT on 5 March 1974. In conjunction with wave measurements, data on ship characteristics , mooring configurations, and ship motion (degree, type, and time of occurrence) were collected and tabulated for vessels berthed in the east channel and west basin of Los Angeles Harbor and in the southeast basin and east basin (slip 1) of Long Beach Harbor. The purpose of the prototype wave observation program was to obtain for a 1-yr period continuous, accurate, and reliable wave data to be used in hydraulic and possibly mathematical models and in evaluating surge conditions in the existing harbors. Ship movement and mooring configuration data were collected to allow correlation of adverse ship motions with prototype wave conditions. Tidal heights and currents were measured in the harbors area to provide data for physical hydraulic model verification and to aid in identifying potential circulation problems. Detailed descriptions of wave gages, recording equipment, operating procedures, and methods for checking and calculating calibration and submergence coefficients are presented for the wave data acquisition system. Relative and absolute accuracy analyses of the pressure-type wave sensors indicate accuracies of the water surface measurements to be ±0.05 ft for transducer response and ±0.1 ft for transducer submergence elevation. Acquisition procedures, data reduction, data editing, modes of permanent storage, and data quality and quantity are discussed in detail for each type of data collected during the prototype field survey of this model study. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/13128
Appears in Collections:	Technical Report