Uncertainty and bias in electronic tide-gauge records

evidence from collocated sensors

Stella Pytharouli, Spyros Chaikalis, Stathis C. Stiros

Research output: Contribution to journalArticle

4 Citations (Scopus)
8 Downloads (Pure)

Abstract

Understanding noise and possible bias in tide-gauge sensors is important for determining the mean sea level, its fluctuations and their climatic, geophysical and engineering implications, but not an easy task. In the past, this problem has been examined through comparison of different sensors in the laboratory, or through correlations of neighbouring sensors. In this study we identified and studied 10 cases of harbours with fully collocated sensors. Transient differences were found between collocated records. Pressure gauges were found significantly more sensitive to noise than radar-type sensors, and with higher chances of long-term transient bias. The amplitude of the observed bias is important, of the same order of magnitude with tsunami waves in the open sea and with seismic ground displacements. Only 9% of the sensors analysed were found to satisfy the 1 cm accuracy criterion imposed by the Permanent Service for Mean Sea Level (PSMSL).
Original languageEnglish
Pages (from-to)496–508
Number of pages13
JournalMeasurement
Volume125
Early online date3 May 2018
DOIs
Publication statusPublished - 30 Sep 2018

Fingerprint

Tide gages
tides
sensors
Sensors
electronics
Sea level
sea level
Spurious signal noise
tsunami waves
pressure gages
Pressure gages
Tsunamis
harbors
Ports and harbors
radar
Uncertainty
engineering

Keywords

  • collocated tide-gauges
  • bias characteristics in tidal records
  • uncertainty limits in tide gauge data
  • van de Casteele test
  • drift
  • offset
  • tide-gauge sensors
  • sea level change

Cite this

Pytharouli, Stella ; Chaikalis, Spyros ; Stiros, Stathis C. / Uncertainty and bias in electronic tide-gauge records : evidence from collocated sensors. In: Measurement. 2018 ; Vol. 125. pp. 496–508.
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Uncertainty and bias in electronic tide-gauge records : evidence from collocated sensors. / Pytharouli, Stella; Chaikalis, Spyros; Stiros, Stathis C.

In: Measurement, Vol. 125, 30.09.2018, p. 496–508.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Uncertainty and bias in electronic tide-gauge records

T2 - evidence from collocated sensors

AU - Pytharouli, Stella

AU - Chaikalis, Spyros

AU - Stiros, Stathis C.

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AB - Understanding noise and possible bias in tide-gauge sensors is important for determining the mean sea level, its fluctuations and their climatic, geophysical and engineering implications, but not an easy task. In the past, this problem has been examined through comparison of different sensors in the laboratory, or through correlations of neighbouring sensors. In this study we identified and studied 10 cases of harbours with fully collocated sensors. Transient differences were found between collocated records. Pressure gauges were found significantly more sensitive to noise than radar-type sensors, and with higher chances of long-term transient bias. The amplitude of the observed bias is important, of the same order of magnitude with tsunami waves in the open sea and with seismic ground displacements. Only 9% of the sensors analysed were found to satisfy the 1 cm accuracy criterion imposed by the Permanent Service for Mean Sea Level (PSMSL).

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KW - bias characteristics in tidal records

KW - uncertainty limits in tide gauge data

KW - van de Casteele test

KW - drift

KW - offset

KW - tide-gauge sensors

KW - sea level change

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