A distributed heat pulse sensor network for thermo-hydraulic monitoring of the soil subsurface

Research output: Contribution to journalArticlepeer-review

Authors

  • Corinna Abesser
  • Francesco Ciocca
  • John Findlay
  • Athena Chalari
  • Michael Mondanos

External organisations

  • British Geological Survey
  • Silixa Ltd
  • Carbon Zero Consulting

Abstract

Fibre optic distributed temperature sensing (DTS) is used increasingly for environmental monitoring and subsurface characterization. Combined with heating of metal elements embedded within the fibre optic cable, the temperature response of the soil provides valuable information from which soil parameters such as thermal conductivity and soil moisture can be derived at high spatial and temporal resolution, and over long distances. We present a novel active distributed temperature sensing (A-DTS) system and its application to characterize spatial and temporal dynamics in soil thermal conductivity along a recently forested hillslope in Central England, UK. Compared with conventional techniques (needle probe surveys), A-DTS provided values with a similar spread although lower on average. The larger number of measurement points that A-DTS provides at higher spatial and temporal resolutions and the ability to repeat surveys under different meteorological or hydrological conditions allow for a more detailed examination of the spatial and temporal variability of thermal conductivities at the study site. Although system deployment time and costs are higher than with needle probes, A-DTS can be extremely appealing for applications requiring long-term monitoring, at high temporal repeatability, over long (kilometres) distances and with minimum soil disturbance, compared with one-off spatial surveys.

Details

Original languageEnglish
Pages (from-to)352-365
Number of pages14
JournalQuarterly Journal of Engineering Geology and Hydrogeology
Volume53
Issue number3
Publication statusPublished - 2020