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Peatland monitoring iucn conference v.4


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Peatland Monitoring Project by Prof David Large

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Peatland monitoring iucn conference v.4

  1. 1. Monitoring Peatland Degradation and Recovery Using Satellite Radar. Case Study: Irish Midlands Overview Map (Sentinel-1) • Differential interferometric synthetic aperture radar (DInSAR) satellite remote sensing techniques have been used for many years to measure land surface motion. • One major restriction is that they generally do not work so well over vegetated areas. • We have solved that problem by developing the ISBAS technique which can survey all terrains. • Overcoming this restriction has opened up the possibility of monitoring Peatland continuously over large areas with DInSAR. • To illustrate the potential we have surveyed all peat bogs within a large area in the Irish Midlands • Using recent Sentinel-1 data and archive ENVISAT data we compare surface motion during the periods 2015-2016 to 2002-2009. • Three lowland raised bogs within the area illustrate the potential of this technique. D. Large1; D. Gee²; A. Sowter²; A. Novellino²; P. Bhatia2 1University of Nottingham, UK; 2Geomatic Ventures Limited, UK Key Observations Clara Bog – Peatland Collapse 1991-20023 • Intensifying subsidence reported3 from W Clara Bog 1991 – 2002 as a result of drainage into underlying aquifer. 2002-2009 • Slow sustained subsidence, most notable in W Clara Bog 2014-15 • Well defined area of rapid subsidence in W Clara Bog focussed on the Western soakaway • Stabilisation and uplift in the central Clara Bog. • Patterns of surface motion appear to be strongly linked to drainage. Application: • Could be used to revise restoration potential and strategy Abbeyleix Bog – Response to Drain Blocking Key Observations Late 1980s • Drainage ditches created 2009 • Drainage ditches blocked 2002 – 2009 • Peat surface subsiding. maximum rate SW of disused railway line. 2014-15 • Rapid uplift of the peat surface along a N-S line, just W of the disused railway line. Issues to be addressed: • Link between mechanical, response, gas flux, cause of uplift and the integrity of the peat structure Knockahaw Bog – Uplift of a Degraded Raised Bog Key Observations Late 1980s • Drainage ditches created4 2002-2009 • S and E subsiding. NW stable 2013 • Bord na Mona note “no infilling of drains with the exception of a couple of drains that had begun to become infilled around and within the flushes and in the NW section”. 4 2014-15 • Rapid uplift of the peat surface in NW of bog and upstream of flushes. • Minimal changes to drainage appear to have had a major influence on water retention and uplift. Legend Abstract Area of Interest 1 2 References and acknowledgements: 1. Drainage for Clara acknowledges LIFE14NATIE000032. 2. Drainage provide by Bord na Mona 3. Heggler et al 2005, Subsidence of Clara Bog West... Rapport 121 Wageningen University 4. Knockahaw rehabilitation plan, Bord na Mona