Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Do peatland microforms move through time? Examining the developmental history of a patterned peatland using ground-penetrating radar
AU - Kettridge, Nicholas
AU - Binley, Andrew
AU - Comas, Xavier
AU - Cassidy, Nigel J.
AU - Baird, Andy J.
AU - Harris, Angela
AU - van der Kruk, Jan
AU - Strack, Maria
AU - Milner, Alice M.
AU - Waddington, James M.
PY - 2012/9
Y1 - 2012/9
N2 - 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 degrees 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.
AB - 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 degrees 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.
KW - CANADA
KW - STRATIGRAPHY
KW - BLANKET MIRE
KW - MIRE DEVELOPMENT
KW - ATTRIBUTES
KW - POOL FORMATION
KW - PHYSICAL-PROPERTIES
KW - CLIMATE-CHANGE
KW - RAISED BOG
KW - MECHANISMS
UR - http://www.scopus.com/inward/record.url?scp=84866711863&partnerID=8YFLogxK
U2 - 10.1029/2011JG001876
DO - 10.1029/2011JG001876
M3 - Journal article
VL - 117
JO - Journal of Geophysical Research: Biogeosciences
JF - Journal of Geophysical Research: Biogeosciences
SN - 2169-8961
IS - G3
M1 - ARTN G03030
ER -