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Title: Design for harbor entrance improvements, Wells Harbor, Maine : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. New England Division.
Bottin, Robert R.
Keywords: Harbors
Harbor engineering
Hydraulic models
Harbor models
Water waves
Water wave action
Wells Harbor, Maine
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-78-18.
Description: Technical Report
Abstract: A 1:50-scale (undistorted) hydraulic model of Wells Harbor, Maine, which included the entrance to the harbor, approximately 900 ft and 1100 ft of shoreline to the south and north of the harbor , respectively, and sufficient offshore area in the Gulf of Maine to permit generation of the required test waves, was used to investigate the effects of proposed improvements at the harbor entrance on wave action. Proposed improvement plans consisted of the installation of stone spur dikes in the jettied entrance and a breakwater attached to the existing north jetty. A 20-ft-long wave generator, a model circulation system, and an automated data acquisition and control system (ADACS) were utilized in model operation. It was concluded from model test results that : (A.) During periods of moderate to large wave attack, the existing harbor entrance experiences hazardous navigation conditions due to breaking waves and interaction of waves with tidal currents. (B.) The originally proposed spur-dike configuration (plan 1) will slightly increase wave heights in the outer entrance (gage 1), will have little effect on wave heights between the outer entrance and the bend in the jetties, and will reduce wave heights through the remainder of the jettied entrance. (C.) Changing the spur-dike cross sections at the entrance (plan 2) will not reduce wave heights at that location. (D.) Removal of the first spur dike attached to the south jetty and the third spur dike attached to the north jetty (approaching from the sea) will not compromise design effectiveness. (E.) Shoaling may occur between the spur dikes, particularly the longer ones attached to the south jetty. (F.) The installation of a breakwater (plan 3) will substantially improve wave conditions in the jettied entrance over those for existing conditions or any of the spur-dike plans tested. (G.) Whether tidal velocities following installation of the proposed spur dikes will be sufficient to maintain a self-scouring channel at described navigable depths is beyond the scope of this model investigation. However, qualitative indications are that the spur dikes will be beneficial in reducing maintenance dredging requirements.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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