|
|
|
Measurement of post-fire hillslope erosion to evaluate and model rehabilitation treatment effectiveness and recovery
Robichaud, P.R. 2005.
Measurement of post-fire hillslope erosion to evaluate and model rehabilitation treatment effectiveness and recovery.
International Journal of Wildland Fire 14(4): 475-485
Keywords: Burned Area Emergency Response; emergency stabilization; mitigation; paired watersheds; sediment; silt fence; wildfire
Links:
PDF [653 KB]
Abstract:
The increasing size and severity of wildfires in the western United States has caused a corresponding increase in
post-fire emergency erosion control activities.
Hillslope treatments, such as broadcast seeding, mulching and installed barriers, are applied to reduce runoff and erosion,
as well as downslope sedimentation. However, there are few data to determine if these post-fire treatments are practical
and effective.
Direct measurement of hillslope erosion, particularly in the remote settings where wildfires occur,
is time consuming and costly.
Rainfall simulation, sediment fences and paired catchment studies have been adapted for measuring post-fire erosion
in the mountainous forest regions of the western USA.
The use of paired catchments to measure hillslope erosion and evaluate treatment effectiveness is illustrated by
an ongoing experiment of six contour-felled log erosion barrier research sites.
Deciding which type of treatments to use, as well as the locations and timing of application,
requires treatment cost and effectiveness to be weighed against potential damage from unmitigated erosion.
To assist in this process, a web-based Erosion Risk Management Tool has been developed that incorporates
variability in rainfall, burn severity and soil properties, as well as treatment options to provide probabilistic erosion
estimates for 4 years after a fire.
Moscow FSL publication no. 2005j
|