Post-Fire Sediment Transport and Erosion  in the Water Canyon and Cañon de Valle      Watershed, Jemez Mountains, NMDRAKOS...
Pajarito Plateau watersheds
Water Canyon/Cañon de Valle investigation    conducted 2010-2011 to assess contaminant         inventory in post-1942 sedi...
Extent of 1977 La Mesa fire within Water Canyon/            Cañon de Valle Watershed
Extent of 2000 Cerro Grande fire within Water Canyon/Cañon de  Valle Watershed and maximum post-fire discharge (6/2000)   ...
Extent of 2011 Las Conchas fire within Water Canyon/Cañon deValle Watershed, and estimated discharge from 8/21/2011 flood ...
Sediment delivery after Cerro Grande wildfire           (Reneau et al., 2007)•   Over 90% of ash delivered to LA Canyon re...
Preservation of in situ ash in post-1942 sediment deposits                                Cerro Grande muck deposit       ...
Methods – 1:200 Scale Mapping
Methods – Characterization of post-1942 sediment deposits
Methods – Characterization of post-1942 sediment depositsGLORIETA GEOSCIENCE INC
Methods – Measure geomorphic cross sectionsLocation selection based on contaminant concentrations and        dendrochronol...
Water Canyon/Cañon de Valle watershed showing reaches
Reach WA-2 Geomorphology, cross section location        c3                    Qbt             f1                          ...
Reach WA-3 Geomorphology, cross section location                                        f1                                ...
Cross sections in Reaches WA-2 and WA-3 showing post-1942sediment deposition and post-Las Conchas fire muck deposits      ...
Water Canyon/Cañon de Valle watershed showing reaches
Cross sections in Reach CDV-1E showing post-1942 sedimentdeposition and post-Las Conchas fire muck deposits and erosion   ...
Cross sections in Reach                           CDV-2W showing post-                               1942 sediment        ...
Cross sections in Reach CDV-2W showing post-1942 sediment deposition and post-Las Conchas fire muckdeposits and erosion me...
Sampling location CV-613603 in reach CDV-2W where c2 unit     was completely eroded during 8/21/2011, flood.
c3               c1       Reach CDV-3          Qc                    Geomorphology, crossQbt                   section loc...
Cross sections in Reach CDV-3 showing post-1942 sediment deposition   and post-Las Conchas fire muck deposits measured aft...
Water Canyon/Cañon de Valle watershed showing reaches
Cross sections in Reach WA-4 showing post-1942 sediment depositionand post-Las Conchas fire muck deposits; < 20% are post-...
Reach WA-5 Geomorphology, cross section location                                  GLORIETA GEOSCIENCE INC               c2...
Cross sections in Reach WA-5 showing post-1942 sediment  deposition and post-Las Conchas fire muck deposits and erosion   ...
8/23/11 Flood coarse sediment    deposits and scouring
Coarse sediment deposits in Cañon de Valle from August 21,2011, flood. Gravel bar adjacent to channel in reach CDV-1E.
Coarse sediment deposits in Cañon de Valle from 8/21/2011   flood. ~2 to 4 m wide gravel deposit buries 0.5m wide         ...
Scour hole in reach CDV-1E demonstrating channel erosion      in Cañon de Valle from August 21, 2011, flood.
Water Canyon fan deposit at Rio Grande (left) anddetail showing ~10 cm thick L.C. muck deposit (right)         Water Canyo...
Conclusions• First post-Las Conchas fire flood on 8/3/11 deposited muck layer  (ashy silt) with a maximum thickness of 22 ...
Pending Investigation (2012)• Systematic assessment of post-Las Conchas erosion and  deposition in reaches investigated in...
Acknowledgements        Steve VeenisLANL Environmental Programs     TerranearPMC.com                              GLORIETA...
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Post-Fire Sediment Transport and Erosion in the Water Canyon and Canon de Valle Watershed, Jamez Mountains, NM

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Water Canyon/Canyon de Valle investigation was conducted by Glorieta Geoscience, Inc., in collaboration with Los Alamos National Laboratory during 2010-2011 to assess contaminant inventory in post-1942 sediments. Characterization of post-1942 sediments using hand-dug pot holes, dendrochronology and measurement of cross sections following post-fire floods.

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Post-Fire Sediment Transport and Erosion in the Water Canyon and Canon de Valle Watershed, Jamez Mountains, NM

  1. 1. Post-Fire Sediment Transport and Erosion in the Water Canyon and Cañon de Valle Watershed, Jemez Mountains, NMDRAKOS, Paul, RENEAU, Steven, SCHULTZ-FELLENZ, Emily, RIESTERER,Jim, KELLEY, Rick, MILLER, Elizabeth, GOETZE, Phillip, andCHAMBERLAIN, Paul GLORIETA GEOSCIENCE INC
  2. 2. Pajarito Plateau watersheds
  3. 3. Water Canyon/Cañon de Valle investigation conducted 2010-2011 to assess contaminant inventory in post-1942 sediments• 1:200 scale mapping in 25+ reaches• Characterization of post-1942 sediments using hand-dug pot holes (identified based on presence of exotic clasts, buried soils, bedrock, etc.)• Dendrochronology utilized to provided supplemental information to constrain the age of flood deposits• Reworked ash from 1977 La Mesa fire and 2000 Cerro Grande fire preserved in situ within sediment deposits provides additional age control• Measurement of cross sections following post-fire floods on 8/3/11 and 8/21/11• 8/21/11 flood est. ~3000 cfs in CDV, larger than 8/3/11 flood GLORIETA GEOSCIENCE INC
  4. 4. Extent of 1977 La Mesa fire within Water Canyon/ Cañon de Valle Watershed
  5. 5. Extent of 2000 Cerro Grande fire within Water Canyon/Cañon de Valle Watershed and maximum post-fire discharge (6/2000) 740 cfs 840 cfs 274 cfs
  6. 6. Extent of 2011 Las Conchas fire within Water Canyon/Cañon deValle Watershed, and estimated discharge from 8/21/2011 flood ~3000 cfs (estimated) 1600+ cfs (estimated) 3500 cfs (est.)
  7. 7. Sediment delivery after Cerro Grande wildfire (Reneau et al., 2007)• Over 90% of ash delivered to LA Canyon reservoir in the first year after the fire• Slurries dominated by ash flow (suspended sediment) follow first convective storm after the wildfire• Sediment transport rates declined after first year, but remained above pre-fire levels five years after the fire• Significant increase in erosion rates in the first year following the fire• Rapid decline in fine-grained sediment transport, whereas coarse-grained sediment transport is prolonged (bedload transport during snowmelt runoff)• Post-fire sediment is primarily deposited within first two years after the fire
  8. 8. Preservation of in situ ash in post-1942 sediment deposits Cerro Grande muck deposit (June 2000)
  9. 9. Methods – 1:200 Scale Mapping
  10. 10. Methods – Characterization of post-1942 sediment deposits
  11. 11. Methods – Characterization of post-1942 sediment depositsGLORIETA GEOSCIENCE INC
  12. 12. Methods – Measure geomorphic cross sectionsLocation selection based on contaminant concentrations and dendrochronology, prior to Las Conchas fire
  13. 13. Water Canyon/Cañon de Valle watershed showing reaches
  14. 14. Reach WA-2 Geomorphology, cross section location c3 Qbt f1 c1 c2
  15. 15. Reach WA-3 Geomorphology, cross section location f1 f2 c3 c2 Qt Qcc1 c1
  16. 16. Cross sections in Reaches WA-2 and WA-3 showing post-1942sediment deposition and post-Las Conchas fire muck deposits 23 of 58 cm post-fire sed (f1s) CG ashy si-fs 10 of 10 cm post-fire sed (f2) ~58 of 123 cm ~58 of 123 cm post-fire sed (f1) post-fire sed (c2) CG ashy si CG ashy si LM(?) ashy vfs CG ashy si at base LM deposit at base 17 of 127 cm post-fire sed (c3)
  17. 17. Water Canyon/Cañon de Valle watershed showing reaches
  18. 18. Cross sections in Reach CDV-1E showing post-1942 sedimentdeposition and post-Las Conchas fire muck deposits and erosion measured after floods on 8/3/11 (left) and 8/21/11 (right)> 50% (+/-75%) of post 1942 sediment deposits are post-fire seds CG muck at base CG ashy si
  19. 19. Cross sections in Reach CDV-2W showing post- 1942 sediment deposition and post-Las Conchas fire muck deposits and erosion measured after flood on 8/21/11 Note in lower cross section Some channel incision but most post-1942 sediments remain in place.CG muck CG ashy si+vfs GLORIETA GEOSCIENCE INC
  20. 20. Cross sections in Reach CDV-2W showing post-1942 sediment deposition and post-Las Conchas fire muckdeposits and erosion measured after flood on 8/21/11 Note erosion of c2 sediments next to channel, preservation of c3/f1 deposits on higher surface, deposition of muck from 8/3/11 and coarse sediment from 8/21/11 flood.
  21. 21. Sampling location CV-613603 in reach CDV-2W where c2 unit was completely eroded during 8/21/2011, flood.
  22. 22. c3 c1 Reach CDV-3 Qc Geomorphology, crossQbt section locationsc2 f1
  23. 23. Cross sections in Reach CDV-3 showing post-1942 sediment deposition and post-Las Conchas fire muck deposits measured after flood on 8/3/11; upstream (left) and downstream (right); post-fire sediment <20% of total post-1942 deposition
  24. 24. Water Canyon/Cañon de Valle watershed showing reaches
  25. 25. Cross sections in Reach WA-4 showing post-1942 sediment depositionand post-Las Conchas fire muck deposits; < 20% are post-fire deposits CG dk vfs+si
  26. 26. Reach WA-5 Geomorphology, cross section location GLORIETA GEOSCIENCE INC c2 f1 c1 Qc Tb c1
  27. 27. Cross sections in Reach WA-5 showing post-1942 sediment deposition and post-Las Conchas fire muck deposits and erosion measured after floods on 8/3/11 (left) and 8/21/11 (right)GLORIETA GEOSCIENCE INC
  28. 28. 8/23/11 Flood coarse sediment deposits and scouring
  29. 29. Coarse sediment deposits in Cañon de Valle from August 21,2011, flood. Gravel bar adjacent to channel in reach CDV-1E.
  30. 30. Coarse sediment deposits in Cañon de Valle from 8/21/2011 flood. ~2 to 4 m wide gravel deposit buries 0.5m wide channel in Reach CDV-2W
  31. 31. Scour hole in reach CDV-1E demonstrating channel erosion in Cañon de Valle from August 21, 2011, flood.
  32. 32. Water Canyon fan deposit at Rio Grande (left) anddetail showing ~10 cm thick L.C. muck deposit (right) Water Canyon Fan Coarse (ms-cs) sediment from 8/21/11 flood? Muck from 8/3/11 flood? Photos taken 11/30/11 Post-Las Conchas sediment deposits along Rio Grande
  33. 33. Conclusions• First post-Las Conchas fire flood on 8/3/11 deposited muck layer (ashy silt) with a maximum thickness of 22 cm at cross section locations• Some erosion also occurred• Second post-Las Conchas fire flood on 8/21/11 was larger discharge event. Coarser-grained sediment deposits up to 50 cm thick at cross section locations were observed in both overbank and channel settings.• Considerable scour and bank widening also observed during second flood event.• Total post-fire related sediment deposits from LM, CG, and LC fires at randomly selected cross sections ranges from up < 20% to 75%, shows a general down-stream attenuation trend• Post-LC muck and coarser-grained sediment deposits observed at mouth of Water Canyon at Rio Grande. GLORIETA GEOSCIENCE INC
  34. 34. Pending Investigation (2012)• Systematic assessment of post-Las Conchas erosion and deposition in reaches investigated in 2010/2011• Reoccupy and resurvey cross sections to quantify post-Las Conchas fire erosion and deposition at specific locations GLORIETA GEOSCIENCE INC
  35. 35. Acknowledgements Steve VeenisLANL Environmental Programs TerranearPMC.com GLORIETA GEOSCIENCE INC

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