US Army Corps of Engineers BUILDING STRONG ® Impact of Beetle Infestation on Hydrology Dr. Christopher A. Hiemstra Cold Regions Res. and Engr. Lab. (CRREL) U.S. Army Corps of Engineers Fort Wainwright, AK [email protected]office: (907) 361-5488 mobile: (907) 347- 1028 November 2010
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US Army Corps of Engineers BUILDING STRONG ® Impact of Beetle Infestation on Hydrology Dr. Christopher A. Hiemstra Cold Regions Res. and Engr. Lab. (CRREL)
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US Army Corps of Engineers
BUILDING STRONG®
Impact of Beetle Infestation on Hydrology
Dr. Christopher A. Hiemstra
Cold Regions Res. and Engr. Lab. (CRREL)U.S. Army Corps of EngineersFort Wainwright, AK
Even-aged forests Drought-stressed trees Warmer winters (higher beetle survival)
Lodgepole pine trees are experiencing high mortality, as seen by their red coloration. In this August 2007 aerial image of the Fraser Experimental Forest, Colorado, dead reddened trees cover vast areas.
BUILDING STRONG®
Widespread Impact
Raffa et al. 2008
BUILDING STRONG®
Kelly Elder
BUILDING STRONG®Soil
Snow
Interception
Litter
TranspirationSnow MeltInfiltrationRunoff
InterceptionInterception
PrecipitationThroughfallWind SpeedSublimation
BUILDING STRONG®
Potential Impacts Pre-disturbance
► Canopy intercepts ~20-36% of snow► transpiration is ~38% of precipitation► higher shading, slower spring melt