Do peatland microforms move through time? Examining the developmental history of a patterned peatland using ground-penetrating radar

Nicholas Kettridge*, Andrew Binley, Xavier Comas, Nigel J. Cassidy, Andy J. Baird, Angela Harris, Jan Van Der Kruk, Maria Strack, Alice M. Milner, James M. Waddington

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Using ground-penetrating radar (GPR) to map subsurface patterns in peat physical properties, we investigated the developmental history of meso-scale surface patterning of microforms within a raised bog. Common offset GPR measurements were obtained along a 45-m transect, at frequencies ranging from 100 to 900 MHz. We found that low-frequency (central frequency < 240 MHz) GPR could not adequately represent the subsurface structures of the peatland because individual peat layers were too thin. However, more detailed high-frequency measurements (central frequency ≥ 240 MHz) showed a striking pattern of subsurface reflections that dip consistently in a northerly direction. The angle of these dipping reflectors is calculated using a semblance algorithm and was shown to average 3.9° between a depth of 1.0 and 2.5 m. These dipping reflectors may indicate downslope migration of surface microforms during the development of the peatland. Based on the estimated angle and the rate of peat accumulation, the average rate of downslope propagation of these surface microforms is calculated at 9.8 mm per year. Further survey work is required to establish whether the downslope migration is common across the peatland.

Original languageEnglish
Article numberG03030
JournalJournal of Geophysical Research
Volume117
Issue number3
Early online date18 Sep 2012
DOIs
Publication statusPublished - 1 Oct 2012

Keywords

  • ecohydrology
  • ground-penetrating radar
  • hydrogeophysics
  • peatland development

ASJC Scopus subject areas

  • Ecology
  • Aquatic Science
  • Atmospheric Science
  • Palaeontology
  • Water Science and Technology
  • Forestry
  • Soil Science

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