Dynamics, Drivers and Mitigation of Submerged Aquatic Vegetation (SAV) and Shoreline Change: Data Needs Associated with the Mid-Currituck Bridge

Research has shown that in Currituck Sound the primary factor limiting SAV distribution is water clarity. An understanding of SAV depth distribution and light availability in this system has provided water depth zones to differentiate the likelihood of sustaining planted SAV. Changes in water clarity driven by Colored Dissolved Organic Matter (CDOM) is likely changing SAV growth on annual timescales. Shoreline erosion is likely impacting water clarity and certainly will influence construction along the banks. SAV in the sound will likely be impacted by construction and shading post construction of the Mid-Currituck Bridge. In addition, studies have shown that shorelines near the Mid-Currituck Bridge terminus on the east and west side are experiencing significant erosion rates. Bridge design and ultimate construction may change local dynamics (i.e., wave field, water clarity) that can influence SAV distribution and shoreline position. This research will focus on expanding data collection near the bridge corridor and developing a predictive model of waves and currents to be used as a predictive tool post construction. The project will further develop the SAV mitigation tool by collecting the necessary higher resolution data (e.g., shoreline position, bathymetry, SAV presence, proximity to existing vegetation, water quality/clarity) to focus future SAV mitigation sites.

Scholars @ ECU