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Petter Pilesjö

Petter Pilesjö

Professor

Petter Pilesjö

Modelling flow routing in permafrost landscapes with TWI : an evaluation against site-specific wetness measurements

Författare

  • Andreas Persson
  • Abdulghani Hasan
  • Jing Tang
  • Petter Pilesjö

Summary, in English

In northern peatlands the thawing of permafrost increasing the active layer depth and changing the hydrology may lead to feedbacks in the climate system through changes in the biogeochemistry of carbon. We are examining this association on the Stordalen peatland complex in subarctic Sweden by analyzing a DEM derived from LiDAR-data and the calculated TWI. The DEM, with a spatial resolution of 1 m, and the TWI are evaluated against two seasons of water level measurements from 30 sites in the peatland. The TWI is calculated with a form-based flow routing algorithm which produces a natural flow routing pattern. In permafrost wetlands the topography is the major driver and is very important even though its magnitude is low. Site-specific wetness (SSW) measurements from the sites were compared with the different peatland types that occur in the study area, i.e. fen, internal fen and palsa. The results showed a strong correlation between the TWI and the palsa. The TWI was better at describing general patterns than site-specific hydrology. The evaluation of spatial patterns of TWI against SSW reveal the resolution required to develop the technique to be useful for climate change studies.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • Centrum för Mellanösternstudier
  • MECW: The Middle East in the Contemporary World
  • eSSENCE: The e-Science Collaboration

Publiceringsår

2012

Språk

Engelska

Sidor

701-713

Publikation/Tidskrift/Serie

Transactions in GIS

Volym

16

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Physical Geography

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1467-9671