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Title: Mobile Bay model study. Report 1, Effects of proposed Theodore Ship Channel and disposal areas on tides, currents, salinities, and dye dispersion
Authors: United States. Army. Corps of Engineers. Mobile District.
Lawing, Raymond J.
Boland, Robert A.
Bobb, William H.
Keywords: Dredged material
Dye dispersion
Environmental impact
Hydraulic models
Mobile Bay
Theodore Ship Channel
Water currents
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-75-13 rept.1.
Description: Technical Report
Abstract: The Mobile Bay model was a fixed-bed model constructed to linear scale ratios of 1:1000 horizontally and 1:100 vertically. As shown in Plate 1, the model reproduced about 268 square miles of the Gulf of Mexico from Pine Beach on the east to about the west end of Dauphin Island, and in a southerly direction to about the -70-ft contour in the Gulf; all of Mobile and Bon Secour Bays; a portion of Mississippi Sound; and the Mobile and Tensaw Rivers and adjacent marshes to the junction of the two rivers at Mt . Vernon, some 40 miles upstream from Mobile. The model was equipped with the necessary appurtenances for accurate reproduction and measurement of tides, tidal currents, salinities, freshwater inflows, density effects, and other important prototype phenomena. The purpose of the model study was to determine the impact of a proposed access channel, referred to as Theodore Ship Channel, and the necessary islands designed to hold the initial construction material and subsequent maintenance dredging on salinities and flow patterns with special interest centered on the oyster industry at the lower end of Mobile Bay. The Theodore Ship Channel connects the existing bay navigation channel and the Theodore Industrial area. Verification tests were conducted to make certain that the model hydraulic and salinity regimens agreed with those of the prototype. The agreements attained between similar model and prototype values were considered satisfactory. The test results consist of comparable measurements of tide heights, current velocities, salinities, surface current patterns, and dye dispersion patterns for existing and proposed conditions. There were nine suggested configurations for the disposal areas, and an abbreviated testing program was first conducted to select the best configuration for complete testing. An analysis of the results of the bottom salinity comparisons of the abbreviated model tests led to the conclusion that for disposal areas west of the main navigation channel, plan 1B was best, closely followed by plan 1D. For plans east of the channel, plan 1G was best. The results of the abbreviated testing program, furnished the Mobile District in preliminary form, and a rating system, incorporating many parameters, such as navigation, economics, environmental effects, aesthetics, and others as reported in Appendix A, were considered. The analysis by the U. S. Army Engineer District, Mobile, indicated disposal island plan 1D to be the most desirable; therefore, this plan was subjected to the formal testing program, along with a modification of plan 1G, in order to have complete results for one plan located on each side of the main bay navigation channel. After the original study had been completed, the Mobile District requested that additional studies be conducted for another disposal area arrangement, designated as plan 1E (modified). The results of those studies are included in Appendix B. Appendixes C and D, which present dye time-concentration curves for plan 1D and plans 1E and 1G (modified), are published under separate cover in limited quantity. Copies are available upon request from the Hydraulics Laboratory, U.S. Army Engineer Waterways Experiment Station. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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