Newburyport Harbor, Massachusetts; Report 2. Design for Hydrodynamics, Salinity, and Sedimentation. Hydraulic Model Investigation.
Abstract
Six plans were selected for extensive hydraulic model testing. Test results consists of comparable measurements for base and proposed improvement conditions. Anlaysis of these data indicates that none of the six plans would cause any significant overall effects to base condition tidal heights, salinities, or dye dispersion. The data analysis does indicate very significant changes in current patterns and magnitudes and in shoaling and scour in the entrance areas and on the outer bar. Most effects were confined to the local area of the plan but generally influenced overall conditions throughout the estuary very little. Plans including the curved extension to the north jetty would each results in a small reduction to the shoaling rates in the outer bar of the channel to such a degree as to offset the gains realized in the outer bar channel. These three plans and Plan 2C would cause hazardous navigation condtions through the entrance due to the extremely high current velocities generated by the plans. Plans D and 3E has the least effects of any of the plans on entrance shoaling and scour. None of the six plans tested had any significant effect on shoaling and scour rates or patterns along the beaches and offshore areas. Each plan resulted in a general but small increase in shoaling along the eastern half of the north shoreline of Plum Island. Plan D provided complete protection of the north shoreline of Plum Island. Keywords: flushing; deposition.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA157046
Entities
People
- D. M. White
- N. J. Brogdon Jr.