Coastal Management on an Eroding Shoreline: An Alternative Restoration Technique

Authors: Lauren Brideau*,
Topics: Coastal and Marine
Keywords: beach replenishment, coastal management, coastal geomorphology, resilience
Session Type: Paper
Day: 4/3/2019
Start / End Time: 2:35 PM / 4:15 PM
Room: Marshall West, Marriott, Mezzanine Level
Presentation File: No File Uploaded


With over 2 miles of oceanfront property, Hammonasset Beach State Park in Madison, Connecticut is a dynamic ecosystem providing ecological services, economic income, and recreational activities to local and regional communities. However, Hammonasset is chronically erosive, particularly at its western end. In December 2017, the Army Corps of Engineers completed a $9 million beach replenishment project along 0.7 miles of the beach with sediment dredged from the Housatonic River boating channel. Importing sand is a temporary but costly solution as large storm waves with short periodicities erode sediment from the beach and transport it into offshore sandbars. Due to the lack of a sufficiently energetic fair-weather wave field in fetch-limited Long Island Sound, sediment is not put back onto the beach once it erodes. For this project, sediment migration is measured by analyzing beach profiles of 27 cross-sectional transects along 1.68 miles of the Hammonasset shoreline. Results after 9 months of the replenishment completion reveal that beach width relative to the MHHW intercept was diminished on average by 30 feet. A more sustainable, cost-effective coastal management technique can be sourced through sediment reclamation which involves recycling eroded sediment from offshore sandbars back onto the beach.

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