A spectral induced polarization instrument using square-wave current injection to track critical zone processes: application to long-term monitoring of a wetland (Guidel, France).

Dataset description

Dataset of spectral induced polarization measurements collected in the wetland area at the Ploemeur-Guidel hydrogeological observatory, to monitor reactive processes with high spatial resolution across the top meter of soil (Figure 1). The spectral content of a signal with line spectrum resulting from square-wave current is exploited by injecting successively three square-wave currents with periods of 1, 10 and 100 s, covering the frequency range of 0.01 to 100 Hz in less than 4 minutes. One dataset consists of eight successive current injections at different depths. For each current injection, the electrical potential is simultaneously measured at seven dipoles. The time-series are recorded with a 2 kHz sampling rate, allowing the Fourier transform of the time-series into amplitude and phase spectra for each quadrupole. Details can be found in the corresponding paper.

SQWA-SIP data: top) time-domain data of three square-wave signals (injected current and measured voltage); middle) spectral amplitude of the three signals (injected current and measured voltage); bottom) complex impedance spectrum.

The DOI includes a raw dataset collected in 2025 and the Matlab code for calculating complex conductivity spectra from these data. It can be downloaded from the links provided below. The full dataset of the Guidel site is available here.

Download links

Dataset
Raw data and Matlab code: link

Acknowledgements

Fundings: UMR 6118 Géosciences Rennes

Contributors: 

  1. Florence Nicollin, UMR 6118 Géosciences Rennes, Université de Rennes, France.
  2. Bruno Kergosien, UMR 6118 Géosciences Rennes, Université de Rennes, France.
  3. Léa Lévy, UMR 6118 Géosciences Rennes, Université de Rennes, France.
  4. Laurent Longuevergne, UMR 6118 Géosciences Rennes, Université de Rennes, France.
  5. Damien Jougnot, UMR 7619 METIS, Sorbonne Université, France.

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