Postwildfire hydrological response in an El Niño–Southern Oscillation–dominated environment

作者: K. M. Tomkins , G. S. Humphreys , A. F. Gero , R. A. Shakesby , S. H. Doerr

DOI: 10.1029/2007JF000853

关键词:

摘要: [1] The rainfall-runoff events following five fires that occurred within a 40-year period in eucalypt forests of the Nattai catchment, southeastern Australia, were investigated to quantify postwildfire hydrological response and provide context for lower than expected erosion sediment transport rates measured after wildfires 2001. Daily rainfall hourly instantaneous discharge records used examine two gauged subcatchments (>100 km2) up 3 years fire compared with nonfire periods. Radar imagery, available from 2001, was determine intensity duration events. Wildfires study catchment appear have no detectable impact on surface runoff at large scale, regardless severity, extent or time fire. Instead, magnitude postfire is related characteristics Rainfall highly variable terms annual totals number, size, type cause substantial are characterized by moderate-high falls lasting one more days (≥1 year average recurrence interval). These triggered synoptic-scale weather patterns, which do not reliably occur window independent broad-scale climate dominated El Nino–Southern Oscillation (ENSO). This highlights importance considering rainfall, as well local factors, interpreting response.

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