Abstract
Shoreline change analysis is an important environmental monitoring tool for evaluating coastal exposure to erosion hazards, particularly for vulnerable habitats such as coastal wetlands where habitat loss is problematic world-wide. The increasing availability of high-resolution satellite imagery and emerging developments in analysis techniques support the implementation of these data into shoreline monitoring. Geospatial shoreline data created from a semi-automated methodology using WorldView (WV) satellite data between 2013 and 2020 were compared to contemporaneous field-surveyed Global Position System (GPS) data. WV-derived shorelines were found to have a mean difference of 2 ± 0.08 m of GPS data, but accuracy decreased at high-wave energy shorelines that were unvegetated, bordered by sandy beach or semi-submergent sand bars. Shoreline change rates calculated from WV imagery were comparable to those calculated from GPS surveys and geospatial data derived from aerial remote sensing but tended to overestimate shoreline erosion at highly erosive locations (greater than 2 m yr−1). High-resolution satellite imagery can increase the spatial scale-range of shoreline change monitoring, provide rapid response to estimate impacts of coastal erosion, and reduce cost of labor-intensive practices.
Highlights
Coastal wetlands serve as a natural barrier between marine and terrestrial habitats and provide essential ecosystem services such as fish and wildlife habitat, carbon sequestration, and natural flood control for upland areas [1,2]
Shoreline erosion is a primary cause of wetland loss in many parts of the world [5] and erosion has been linked to wind-driven waves, sediment availability and delivery, boat traffic, and sea level rise [6,7,8,9,10]
The accuracy of an automated technique for mapping saltmarsh shoreline position using WV satellite data was quantified by comparing WV-derived shorelines to field-collected Global Position System (GPS) shoreline data using both a point- and transect-based technique
Summary
Coastal wetlands serve as a natural barrier between marine and terrestrial habitats and provide essential ecosystem services such as fish and wildlife habitat, carbon sequestration, and natural flood control for upland areas [1,2]. Shoreline erosion is a primary cause of wetland loss in many parts of the world [5] and erosion has been linked to wind-driven waves, sediment availability and delivery, boat traffic, and sea level rise [6,7,8,9,10]. Environmental monitoring and assessment are critical for detecting the impacts of environmental change and developing adaptative management strategies [11,13]. This is true for coastal areas where erosion hazards are threatening critical habitats such as coastal wetlands
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