Groin Field Shoreline Stabilization Technique

Taylor Zimmerman’s PDH lecture at COPRI – Coasts, Oceans, Ports, and Rivers Institute Chapter of the ASCE Met Section discussed the performance of notched groins within a groin field and their impact on the morphological evolution of beach nourishment in Deal, NJ.

This study focused on the shoreline stabilization technique called groin notching, which is designed to prevent downdrift erosion and create a smooth, continuous shoreline throughout the groin field. This helps to maintain a wide beach profile which can offer increased protection against coastal storm events.

Taylor specifically investigated Deal Beach, where three of the eight groins comprising the groin field were notched to facilitate the bypassing of longshore sediment transport while maintaining a stable shoreline. The site was monitored using Unmanned Aerial Systems Structure from Motion (UAS-SfM) photogrammetry. The near-term morphological response of the study site analyzed using high-resolution digital elevation models (DEMs) in conjunction with longshore sediment transport estimates based on measured wave data.

Abstract: An evaluation of the performance and specifications of the notched groins was undertaken. In 2016, the beach in Deal was nourished and three of the eight groins comprising the groin field were concurrently notched to promote increased movement of longshore sediment transport while maintaining a stable shoreline. The study site was monitored nine times over a period of two years (2018-2019) using Unmanned Aerial Systems Structure from Motion (UAS-SfM) photogrammetry. The near-term morphological response of the study site was evaluated by analyzing high-resolution digital elevation models (DEMs) in conjunction with longshore sediment transport estimates based on measured wave data. The elevation change maps confirmed that overall, the groin field at Deal effectively retained the nourishment sand.

About Taylor: Specializing in marine and coastal projects, Taylor is a civil and coastal engineer with a Federal Aviation Administration (FAA) UAS Remote Pilot certification.



Posted on: Feb. 26, 2021