Limits of windthrow-driven hillslope sediment flux due to varying storm frequency and intensity

J.A. Constatine, M.J. Schelhaas, E. Gabet, S.M. Mudd

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

The uprooting and toppling of trees during storms transports soil, exhumes bedrock, and thus influences the evolution of hillslopes. Given predicted increased storminess due to future climate change, we adapt a forest-gap model (ForGEM) to explore windthrow-driven sediment transport in a Douglas fir forest under increasingly severe wind regimes in order to better assess potential future impacts on soil erosion. Larger trees are more sensitive to wind loading and are therefore preferentially toppled as storm frequency and intensity increase. Because larger trees have larger root-plate volumes and can move large volumes of sediment, increased wind velocities lead to an increase in sediment flux. With increasingly stormier conditions, however, the proportion of large trees dwindles. The net effect of these two countervailing trends is that sediment transport increases as average annual rates of windthrow approach eight trees per hectare, but begins to decline thereafter. Our results highlight the complex relationship between climate and sediment transport, particularly when it is mediated by the biota.
Original languageEnglish
Pages (from-to)66-73
JournalGeomorphology
Volume175-176
DOIs
Publication statusPublished - 2012

Keywords

  • process-based model
  • forest dynamics
  • douglas-fir
  • catastrophic windthrow
  • north-carolina
  • root throw
  • wind-throw
  • disturbance
  • transport
  • trees

Fingerprint

Dive into the research topics of 'Limits of windthrow-driven hillslope sediment flux due to varying storm frequency and intensity'. Together they form a unique fingerprint.

Cite this