Modelling long-term (300¿ka) upland catchment response to multiple lava damming events

W. van Gorp, A.J.A.M. Temme, A. Veldkamp, J.M. Schoorl

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Landscapes respond in complex ways to external drivers such as base level change due to damming events. In this study, landscape evolution modelling was used to understand and analyse long-term catchment response to lava damming events. PalaeoDEM reconstruction of a small Turkish catchment (45¿km2) that endured multiple lava damming events in the past 300¿ka, was used to derive long-term net erosion rates. These erosion rates were used for parameter calibration and led to a best fit parameter set. This optimal parameter set was used to compare net erosion landscape time series of four scenarios: (i) no uplift and no damming events; (ii) no uplift and three damming events; (iii) uplift and no damming events; and (iv) uplift and three damming events. Spatial evolution of net erosion and sediment storage of scenario (iii) and (iv) were compared. Simulation results demonstrate net erosion differences after 250 000¿years between scenarios with and without dams. Initially, trunk gullies show less net erosion in the scenario with damming events compared with the scenario without damming events. This effect of dampened erosion migrates upstream to smaller gullies and local slopes. Finally, an intrinsic incision pulse in the dam scenario results in a higher net erosion of trunk gullies while decoupled local slopes are still responding to the pre-incision landscape conditions. Sediment storage differences also occur on a 100¿ka scale. These differences behaved in a complex manner owing to different timings of the migration of erosion and sediment waves along the gullies for each scenario. Although the specific spatial and temporal sequence of erosion and deposition events is sensitive to local parameters, this model study shows the manner in which past short-lived events like lava dams have long-lasting effects on catchment evolution.
Original languageEnglish
Pages (from-to)888-900
JournalEarth Surface Processes and Landforms
Volume40
Issue number7
DOIs
Publication statusPublished - 2015

Keywords

  • western turkey
  • landscape evolution
  • fluvial system
  • gediz river
  • environmental-change
  • volcanic disruption
  • thresholds
  • depressions
  • algorithm
  • pliocene

Fingerprint Dive into the research topics of 'Modelling long-term (300¿ka) upland catchment response to multiple lava damming events'. Together they form a unique fingerprint.

  • Cite this