Cedar Cliff Spillway

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Between 1932 and 2010 the state of Louisiana has lost about 2006 square miles of land due to a combination of subsidence, sea level rise, and management of the Mississippi River. Computer models predict a further loss of 1800 to 4200 square miles in the next 50 years, amounting to 55% of the land in Plaquemines Parish and resulting in $300 million in annual economic damage. Following hurricanes Katrina and Rita, the Coastal Protection and Restoration Authority (CPRA) was formed as a single state entity with the authority to protect and restore the lands of coastal Louisiana.

The $50 billion coastal master plan includes restoration and risk reduction projects. The restoration projects include barrier island restoration, hydrologic restoration, marsh creation, ridge restoration, sediment diversion, and shoreline protection. The Barataria and Breton Basins have experienced some of the largest land loss—almost 700 square miles. Two sediment diversions are being designed, one for each basin. The sediment diversions connect the Mississippi River to the basins, allowing for the controlled diversion of up to 75,000 cfs of water and sediment to the Barataria basin and 30,000 cfs to the Breton basin.

The design and construction of sediment diversions on the scale proposed for Barataria and Breton is unprecedented, the results of which will rely heavily on the numeric and physical modeling required to design the major diversion features, including the inlet, conveyance, and outlet structures. Alden is constructing two 1:65-scale, live-bed physical models to test performance and effectiveness of the diversions.

Discover more:

• Making Mississippi Mud In Massachusetts To Restore Wetlands | Here & Now [wbur.org]
• A Mini Mississippi In Mass. May Help Save New Orleans From Rising Seas [90.9 Boston NPR]
• Rerouting the Mississippi River could build new land—and save a retreating coast [Science Magazine]
• Find the Mississippi River in Massachusetts [Chronicle 5 WCVB]
• To Save Louisiana’s Vanishing Coast, Build a Mini Mississippi Near Boston [The New York Times nytimes.com]
• Louisiana researchers tackle a changing Mississippi Delta [PBS News Hour Weekend pbs.org]
• Mid-Barataria Sediment Diversion could create, save 47 square miles of land over 50 years [nola.com]
• CPRA Using Giant Model to Test Mid-Barataria Diversion
• Mississippi River Diversions Could Save Louisiana's Drowning Coast [enr.com]
• Louisiana Coastal Protection and Restoration Authority [Official Website]
• A Mini-Diversion in Boston is Paving the Way for Louisiana’s Boldest Coastal Project [mississippiriverdelta.org]

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{id=61570585105, createdAt=1639074811145, updatedAt=1664364929070, path='clifty-creek-power-plant-intake-modification', name='Clifty Creek Power Plant Intake Modification', 1='{type=string, value=Clifty Creek Power Plant Intake Modification}', 33='{type=number, value=0}', 34='{type=list, value=[{id=9, name='Applied Data & Technology', order=3, label='Applied Data & Technology'}, {id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=investigation of the hydraulic, thermal, and sediment dynamics within a cooling water intake forebay on the Ohio River, including both 3D numeric and physical modeling}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=60, name='316(b) Compliance', order=11, label='316(b) Compliance'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=3, name='316(b) Compliance', order=2, label='316(b) Compliance'}, {id=4, name='Intakes', order=3, label='Intakes'}, {id=30, name='Hydropower', order=29, label='Hydropower'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=6, name='Field Study', order=5, label='Field Study'}, {id=11, name='Sediment Modeling', order=10, label='Sediment Modeling'}]}', 39='{type=string, value=clifty-creek-power-plant-intake-modification}', 8='{type=string, value=

In order to meet screen velocity requirements of the Clean Water Act 316 b rule, American Electric Power has investigated the possibility of replacing the Clifty Creek Power Plant traveling water screens with an array of cylindrical wedgewire screens in the cooling water intake forebay.  The site on the Ohio River experiences significant siltation, and there were concerns about associated vulnerability of the wedgewire screens. 

Alden performed flow modeling to evaluate this possibility, and provide possible solutions. The model scope included river flow both upstream and downstream of the intake structure and flow within the intake structure. To model the geometric details of the system accurately, a field survey conducted by Alden was performed prior to the flow modeling efforts. The flow study included 2D and 3D numeric modeling, as well as scale physical modeling.

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