Effects of wildfire on runoff generating processes in northern Mongolia

  • Benjamin Johannes Kopp
  • Jens Lange
  • Lucas Menzel
Original Article

Abstract

Seasonal runoff generation in a headwater (~100 km2) of the mountainous Sugnugr Basin, situated within the discontinuous permafrost zone of northern Mongolia, was investigated. The role of the active layer and the effects of a recent wildfire on runoff generation were elucidated. On the catchment scale, stormflow events were investigated by streamflow hydrograph analysis and stable isotope investigations. Hydrological response parameters indicate increasing recession periods and delayed flow fractions during summer as active layer thickness increases. Isotopic signature revealed a high ratio of meltwater in river baseflow in early summer and a gradual decline until the beginning of September. During a stormflow event in early summer, a high fraction of event water was determined by two-component hydrograph separation. At a taiga-vegetated hillslope, subsurface flow was observed following precipitation events after a relative increase in upper soil volumetric water content (VWCi) of 0.05 m3 m−3, demonstrating the retarding characteristics of the organic surface layer. Depending on active layer depth, subsurface flow predominantly occurred in the organic surface layer in early summer and subsequently subsided into the underlying mineral layer as soils thawed. After a wildfire, the water retention capacity of the organic surface layer diminished, as was reflected by a VWCi of 0.01 m3 m−3. Here, stormflow water temperatures indicated quickflow in the mineral layer above a degenerated frost table. The results of the study suggest that wildfires increase stormflow runoff while baseflow declines. Hence, the problem of water shortages in downstream areas during dry weather conditions is exacerbated.

Keywords

Discontinuous permafrost Hydrograph separation Mongolia Stable isotopes Stormflow Runoff generation 

Supplementary material

10113_2016_962_MOESM1_ESM.tif (11.3 mb)
Fig. 1Supplementary Material: Schematic scheme showing the position of the active layer above the frost table and the dominant runoff pathways during stormflow in the taiga in early (a) and late summer (b) and in the burned taiga in early (c) and late summer (d) (TIFF 11572 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Benjamin Johannes Kopp
    • 1
  • Jens Lange
    • 2
  • Lucas Menzel
    • 1
  1. 1.Institute of Geography - Physical GeographyHeidelberg UniversityHeidelbergGermany
  2. 2.Chair of HydrologyUniversity of FreiburgFreiburgGermany

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