Validation of a probabilistic post-fire erosion model
Robichaud P.R., Elliot W.J., Lewis S.A., Miller M.E. 2016.
Validation of a probabilistic post-fire erosion model.
International Journal of Wildland Fire 25(3), 337–350.
http://dx.doi.org/10.1071/WF14171
Keywords: erosion prediction, FS WEPP, post-fire assessment, probabilistic model
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Abstract:
Post-fire increases of runoff and erosion often occur and land managers need tools to be able to project the
increased risk. The Erosion Risk Management Tool (ERMiT) uses the Water Erosion Prediction Project (WEPP) model as
the underlying processor. ERMiT predicts the probability of a given amount of hillslope sediment delivery from a single
rainfall or snowmelt event on unburned, burned and recovering forest, range and chaparral hillslopes and the effectiveness
of selected mitigation treatments. Eight published field study sites were used to compare ERMiT predictions with observed
sediment deliveries. Most sites experienced only a few rainfall events that produced runoff and sediment (1.3–9.2%)
except for a California site with a Mediterranean climate (45.6%). When sediment delivery occurred, pooled Spearman
rank correlations indicated significant correlations between the observed sediment delivery and those predicted by
ERMiT. Correlations were r¼0.65 for the controls, r¼0.59 for the log erosion barriers and r¼0.27 (not significant) for
the mulch treatments. Half of the individual sites also had significant correlations, as did 6 of 7 compared post-fire years.
These model validation results suggest reasonable estimates of probabilistic post-fire hillslope sediment delivery when
compared with observations from eight field sites.
Moscow FSL publication no. 2016c
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