Keta Sea Defense Project, Great Lakes Dredge and Dock |

Case Study

Keta Sea Defense Project, Great Lakes Dredge and Dock

Overview

To develop a permanent solution to the shoreline erosion threatening the community, a $100-million project to protect existing homes, infrastructure, and the environmentally sensitive area was executed by Baird.

Services Provided

Planning, analysis, conceptual and final design were all required for this project, which included: extensive analysis of physical conditions (wind, waves, currents, and tide levels); in depth investigations into the geomorphology of the shoreline, both local and far afield; full geotechnical and geologic investigations; real time DGPS surveys covering the entire site, land and ocean based; siting evaluation of control structures and optimizing orientation and length using physical and numerical modeling; long term evaluation of shoreline changes and review of environmental impacts; and evaluation of storm surge, flooding, and flood mitigation measures.

Plans and Specifications for Construction

Detailed numerical and physical modeling of beach/shoreline evolution to determine design requirements
New quarry development evaluation of suitability and production estimates
1,000,000 tons of quarried stone for coastal structures
12 million cubic yards of dredging
800 acres of land reclamation and beach nourishment
Nine rubblemound headland breakwaters, each in excess of 700 LF to stabilize shoreline and maintain safe beach width
Detailed review of construction approach to optimize the amount of material handling and placing time

Management/Coordination

Encouraged strong client involvement by having government officials visit modeling facilities and design offices
Aggressive fast track scheduling on design-build project
Strong communication with contractor and substantial on site design to maintain program and minimize costs

Project Highlights

Sea defense, coastal highway and land reclamation for $100-million USD project
Wind, wave, current, water level analysis and field data collection, wave gages
Detailed shoreline evolution analysis, numerical and physical models
Quarry design and production analysis
Plans and specifications for construction
Services during construction

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