Vertical Land Motion in the Chesapeake Bay: Workshop Summary
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Vertical Land Motion in the Chesapeake Bay: Workshop Summary

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    Vertical land motion (VLM) refers to the long-term rate of elevation change of the land surface compared to the Earth’s center. VLM can be a significant contributor to relative sea level rise (RSLR) in parts of the Mid-Atlantic region. Rates of VLM occur at the millimeter-per-year scale and local VLM rates vary widely along the Atlantic coast with the Chesapeake Bay (CB) having an estimated range between 1- 4 mm yrof subsidence.1 Accurately determining VLM rates across the region could contribute to better predictions of local variation in RSLR and identify human-caused subsidence hotspots. Vertical land motion in the CB region is measured using a variety of data collection techniques. The methods–e.g. Global Navigation Satellite Systems (GNSS), Interferometric Synthetic Aperture Radar (InSAR), extensometers, and tidal stations–differ in their extent of spatial coverage, temporal detail, and cost. In 2019, a consortium of federal and state agencies and university partners2 took a novel approach to obtain consistent and reproducible Global Positioning System-based VLM measurements across the region in a “VLM Monitoring Campaign.” Because of the interest in VLM in the CB region, a workshop was held to explore current VLM research and connect VLM scientists with coastal managers to discuss how VLM and RSLR data may contribute to coastal resilience planning.
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