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Transfer of a Low-cost Tidal Wetland Water Level Monitoring System: Hyperlocal Calculations of Inundation and Tidal Datums for Understanding Change and Restoration Planning - NERRS/NSC(NERRS Science Collaborative)

Published by Office for Coastal Management | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: December 27, 2025 | Last Modified: 2022-12-01T00:00:00.000+00:00
A transfer project brought low-cost arm-and-float water level loggers and tidal calculation expertise to seven reserves to help characterize flooding dynamics for different marsh habitat features and inform targeted management activities. The Project Reliable water level information is vital for understanding how tidal flooding and inundation affect coastal wetlands. Despite the rich body of tidal wetland studies in the Reserve System, availability of small-scale, wetland feature-specific water level monitoring data has been minimal even for reserves with well-developed wetlands and water level monitoring programs. In some cases, the nearest NOAA tidal station is located too far from a reserve's wetlands to serve as an appropriate reference when assessing flooding regimes. By producing high-precision water level monitoring data, reserves can document variability among tidal wetland features, ultimately informing potential management activities. These data and analyses can then help to plan targeted restorations or manipulations that improve habitat resilience to sea level rise. The project team employed a targeted training approach to install Arm-and-Float water level loggers - novel equipment designed and field-tested by the project lead at Waquoit Bay NERR - and bring expertise in hydrodynamic monitoring and tidal datum calculation to six other reserves. Research and stewardship staff served as the primary users and provided 10-14 sites where detailed water level information would help to guide restoration or understanding of vegetation monitoring trends as they relate to inundation periods. Local NERR staff also assisted with equipment deployment, retrieval and elevation surveys at their logger sites. The project deployed instruments at numerous sites across participating reserves over a period of 1-2 years. The team analyzed data associated with a subset of these deployment periods and provided reserve staff at these locations with tidal datums associated with specific marsh features.

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