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Recovery of small-scale infiltration and erosion after wildfires

Posted date: December 14, 2018
Publication Year: 
2018
Authors: Larson-Nash, Sierra S.; Robichaud, Pete R.; Pierson, Fredrick B.; Moffet, Corey A.; Williams, C. Jason; Spaeth, Kenneth E.; Brown, Robert E.; Lewis, Sarah A.
Publication Series: 
Scientific Journal (JRNL)
Source: Journal of Hydrology and Hydromechanics. 66(3): 261-270.

Abstract

Wildfires naturally occur worldwide, however the potential disruption to ecosystem services from subsequent post-fire flooding and erosion often necessitates a response from land managers. The impact of high severity wildfire on infiltration and interrill erosion responses was evaluated for five years after the 2003 Hot Creek Fire in Idaho, USA. Relative infiltration from mini-disk tension infiltrometers (MDI) was compared to rainfall simulation measurements on small burned and control plots. Vegetation recovery was slow due to the severity of the fire, with median cover of 6-8% on burned sites after 5 years. Consequently, interrill sediment yields remained significantly higher on the burned sites (329-1200 g m-2) compared to the unburned sites (3-35 g m-2) in year 5. Total infiltration on the burned plots increased during the study period, yet were persistently lower compared to the control plots. Relative infiltration measurements made at the soil surface, and 1- and 3-cm depths were significantly correlated to non-steady state total infiltration values taken in the first 10 minutes of the hour-long rainfall simulations. Significant correlations were found at the 1-cm (ρ = 0.4-0.6) and 3-cm (ρ = 0.3-0.6) depths (most p-values

Citation

Larson-Nash, Sierra S.; Robichaud, Peter R.; Pierson, Fredrick B.; Moffet, Corey A.; Williams, C. Jason; Spaeth, Kenneth E.; Brown, Robert E.; Lewis, Sarah A. 2018. Recovery of small-scale infiltration and erosion after wildfires. Journal of Hydrology and Hydromechanics. 66(3): 261-270.