Monitoring coastal sea level using reflected GNSS signals
Journal article, 2011

A continuous monitoring of coastal sea level changes is important for human society since it is predicted that up to 332 million people in coastal and low-lying areas will be directly affected by flooding from sea level rise by the end of the 21st century. The traditional way to observe sea level is using tide gauges that give measurements relative to the Earth’s crust. However, in order to improve the understanding of the sea level change processes it is necessary to separate the measurements into land surface height changes and sea surface height changes. These measurements should then be relative to a global reference frame. This can be done with satellite techniques, and thus a GNSS-based tide gauge is proposed. The GNSS-based tide gauge makes use of both GNSS signals that are directly received and GNSS signals that are reflected from the sea surface. An experimental installation at the Onsala Space Observatory (OSO) shows that the reflected GNSS signals have only about 3 dB less signal-to-noise-ratio than the directly received GNSS signals. Furthermore, a comparison of local sea level observations from the GNSS-based tide gauge with two stilling well gauges, located approximately 18 km and 33 km away from OSO, gives a pairwise root-mean-square agreement on the order of 4 cm. This indicates that the GNSS-based tide gauge gives valuable results for sea level monitoring.

local sea level monitoring

GNSS

tide gauge

reflected signals

Author

Johan Löfgren

Chalmers, Earth and Space Sciences, Space Geodesy and Geodynamics

Rüdiger Haas

Chalmers, Earth and Space Sciences, Space Geodesy and Geodynamics

Jan Johansson

Chalmers, Earth and Space Sciences, Space Geodesy and Geodynamics

Advances in Space Research

0273-1177 (ISSN)

Vol. 47 2 213-220

Subject Categories

Other Engineering and Technologies

Other Engineering and Technologies not elsewhere specified

Other Earth and Related Environmental Sciences

Earth and Related Environmental Sciences

Oceanography, Hydrology, Water Resources

Roots

Basic sciences

Driving Forces

Innovation and entrepreneurship

DOI

10.1016/j.asr.2010.08.015

More information

Created

10/6/2017