BOULDER CREEK FIRE FLUVIAL GEOMORPHOLOGY GEOCORPS POSITIONS: A LONG TERM ASSESSMENT OF CHANNEL MORPHOLOGY AND LARGE WOOD DYNAMICS IN POST-FIRE MOUNTAIN STREAMS ON THE BRIDGER-TETON NATIONAL FOREST Ryan T. Richardson 1 , Ben S. Kraushaur 1 , Sandra E. Ryan 2 , Kathleen A. Dwire 2 , Mark Dixon 2 1 GeoCorps America, Geologic Society of America, 3300 Penrose Place, Boulder, CO 80301-1806 2 US Forest Service, Rocky Mountain Research Station, 240 W. Prospect Rd.,
Transcript
BOULDER CREEK FIRE FLUVIAL GEOMORPHOLOGY GEOCORPS POSITIONS: A LONG TERM ASSESSMENT OF CHANNEL
MORPHOLOGY AND LARGE WOOD DYNAMICS IN POST-FIRE MOUNTAIN STREAMS ON THE BRIDGER-TETON NATIONAL
FOREST
Ryan T. Richardson1, Ben S. Kraushaur1, Sandra E. Ryan2, Kathleen A. Dwire2, Mark Dixon2
1GeoCorps America, Geologic Society of America, 3300 Penrose Place, Boulder, CO 80301-1806
2US Forest Service, Rocky Mountain Research Station, 240 W. Prospect Rd., Fort Collins, Colorado 80526
• Instrumentation – Total Station Instrument– Prism Poles
0 6 12 18 243
Meterst
LegendOld cutbank
Logs 2001
Centerline 2001
Early banks
Reach 36 2001
0 6 12 18 243
Meterst
LegendNew logs in 2002
Old cutbank
Remained in place 2001
Centerline 2001
Early Banks
Reach 36 2002
0 6 12 18 243
Meterst
LegendLogs moved in 2003
Logs new in 2003
Logs in place
Old cutbank
Centerline
Early banks
Reach 36 2003
0 6 12 18 243
Meterst
LegendLogs missing 2007
Logs new 2007
Logs moved 2007
Logs Inplace 2007
Old cutbank
Early banks
2007_Centerline
2007_Banks
Reach 36 2007
0 6 12 18 243
Meterst
LegendMissing in 2008
New recruits 2008
Moved within reach 2008
Buried 2008
Remained in place 2008
2007 Banks
2007 Centerline
2008 Newly eroded area
2008 New centerline
Old cutbank
Reach 36 2008
0 6 12 18 243
Meterst
LegendMissing in 2008
New recruits 2008
Moved within reach 2008
Buried 2008
Remained in place 2008
2007 Banks
2007 Centerline
2008 Newly eroded area
2008 New centerline
Old cutbank
Reach 36 2008
0 6 12 18 243
Meterst
LegendNew recruits 2013
Broken in 2013
Missing in 2013
Buried in 2013
Moved within reach 2013
Remained in place 2013
2013 Centerline
2013 Banks
Old cutbank
Reach 36 2013
0 6 12 18 243
Meterst
LegendOld cutbank
Logs 2001
Centerline 2001
Early banks
Reach 36 2001
0 6 12 18 243
Meterst
LegendAll large wood 2013
2013 Centerline
2013 Banks
Old cutbank
Reach 36 2013All existing wood
http://www.inciweb.org/incident/map/3726/2/
Future Research
Conclusion
• Wood recruitment increases 4-7 years post fire
• This increase in large in-stream wood form log jams in channel
• These log jams create depositional areas that eventually cause bank migration and channel avulsions
Acknowledgements• Geologic Society of America • GeoCorps America• Bridger Teton National Forest• Rocky Mountain Research Station• US Forest Service• National Fire Plan
References• Rim Fire BAER Team, Soil Burn Intensity Map,
http://www.inciweb.org/incident/map/3726/2/
• Mortiz, Max. Climate change and disruptions to global fire activity. Ecosphere. V3(6). June 2012. Article 25.
