Zulfikar Adlan Nadzir, Irdam Adil
The expansion of the tide gauge network along the coast is essential for better monitoring of sea-level dynamics. Owing to climate change, the urgency has been exacerbated, especially during the last two decades. However, densification remains a challenging task because of the lack of affordability of the sensor, especially in the Global South. Further, the precision and accuracy requirements of 1-cm imposed by the Global Sea Level Observing System (GLOSS) is too restrictive, particularly for low-cost tide gauge sensors. Here, we evaluated the performance of a low-cost DIY tide gauge in meeting these standards. Three sets of sea level observations from IR-TIDES, a DIY tide gauge sensor observed in 2016 and 2018, were subjected to a performance test in terms of precision and accuracy in comparison with a global tide model and two neighbouring established tide gauges. All three datasets were estimated to have an 8-cm standard deviation as a metric for the precision level. In terms of accuracy, the IR-TIDES datasets had a standard deviation of 25 cm and a correlation coefficient of 0.616. Overall, IR-TIDES demonstrated sufficient precision while still lacking accuracy, partially meeting the GLOSS quality standard. These findings could strengthen the confidence level of a low-cost DIY tide gauge, especially for use as a backup and redundant sensor for an established tide gauge station after addressing the limitations. © 2024 by the authors.
Department of Geomatic Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu Way Hui, Jati Agung District, South Lampung, 35365, Indonesia; Institute of Geodesy and Geoinformation, University of Bonn, Nussallee 17, Bonn, 53115, Germany
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