Influence of Shoreline Stabilization Structures on the Nearshore Sedimentary Environment in Mesohaline Chesapeake Bay
Abstract
Shorelines around many estuaries and coastal embayments are rapidly eroding (approximately several meters/year), with more rapid erosion rates expected in the future due to natural and anthropogenic stressors. In response, a variety of techniques have been used to stabilize shorelines, but there are limited quantitative, long-term data available about their effects on the sedimentary environment immediately adjacent to them (i.e., the nearshore). This study evaluated changes in sediment characteristics (mud and organic content) and accumulation rates associated with installation of breakwaters, riprap, and living shorelines with (“hybrid”) and without (“soft”) a structural component. 210Pb (half-life 22.3 years) geochronologies were used to identify horizons in core profiles that corresponded to years when structures were built. Sites with naturally eroding shorelines (i.e., no structures) were used as a control group at which any sedimentary changes represent broad environmental trends, in contrast to changes at the protected sites that also include the influence of structures. Observations were placed within the context of modeled wave climate, shoreline-erosion rates, land use, dominant sediment source, and the apparent effect on submersed aquatic vegetation (SAV) inhabiting the nearshore sedimentary environment. The main conclusion of this study is that there was no “one size fits all” answer to anticipated impacts of structures on nearshore sedimentary environments. Instead, specific changes associated with structures depended on individual site characteristics, but could be predicted with multiple linear regression models that included structure type, shoreline-erosion rate, dominant sediment source, and land use. Riprap or breakwater installation had either positive or no obvious impact on SAV at six of seven sites but negatively impacted SAV at one riprapped site. No obvious impacts on SAV were observed at living shoreline sites.
Keywords
Breakwater Living shoreline Riprap Submersed aquatic vegetation (SAV) 210Pb Shoreline erosion Sediment accumulation rates Sedimentary characteristics (mud and organic content)Notes
Acknowledgements
The authors would like to thank the many students and technicians who provided invaluable field and laboratory assistance. We especially thank Debbie Hinkle, Rebecca Swerida, Nick Taylor, and Jia Gao. Dale Booth provided critical assistance with the SAV field and GIS data. We dedicate this paper to the memory of our co-author Evamaria W. Koch, dear friend and colleague, whose passion and insight was critical to this project. Eva worked tirelessly on understanding the interactions between seagrass beds and their physical and sedimentary environments, and her legacy reaches far beyond this project and these colleagues.
Funding Information
This project was funded by NOAA/Maryland Sea Grant award SA7528114. This is UMCES Contribution #5420.
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