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Producing a tide gauge network with geodetic leveling control to support long-term monitoring, adapting, and understanding of coastal sea levels

Authors

Widlansky,  Matthew
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Avery,  Jonathon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Young,  Derek
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Klem,  Jason
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Turetsky,  Nikolai
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jardin,  Jerard
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rose,  Linta
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Feng,  Xue
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Devlin,  Adam
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Thompson,  Philip
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Genz,  Ayesha
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dusek,  Gregory
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Widlansky, M., Avery, J., Young, D., Klem, J., Turetsky, N., Jardin, J., Rose, L., Feng, X., Devlin, A., Thompson, P., Genz, A., Dusek, G. (2023): Producing a tide gauge network with geodetic leveling control to support long-term monitoring, adapting, and understanding of coastal sea levels, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2162


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018697
Abstract
<!--!introduction!--><b></b><p>To enhance monitoring and understanding of coastal sea levels, as well as provide information for adapting to sea level rise, the University of Hawaii Sea Level Center is installing new tide gauges throughout the Hawaiian Islands. All of the tide gauge stations are designed according to quality-control standards developed by the UNESCO-IOC Global Sea Level Observing System (GLOSS), along with two additional geodetic leveling steps. Firstly, to facilitate long-term monitoring of sea levels relative to the coastline, the vertical datum of each station is held constant with respect to the regional land elevation. New for this Hawaii tide gauge network, all of the water level measurements are referenced to an island-specific vertical datum, which is based on each station elevation with respect to a constant tidal datum. On the island of Oahu, for example, elevations of five new tide gauges are referenced to the tide gauge in Honolulu Harbor. We determined station elevations by surveying with respect to an existing benchmark network in Hawaii that is on a common datum (NAD PA11 ellipsoidal height). Measuring water levels with respect to island-specific datums will support adaptation planning to address sea level rise by determining how sea levels vary by location. We also recorded ellipsoidal height differences from the gravitational model for Hawaii (GEOID12B) to transfer sea levels into a physically consistent framework. Here, the methodology for implementing the Hawaii tide gauge network will be presented, along with discussion about applicability to other regions where long-term monitoring of sea levels is important. </p>