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Pacific Southwest Research Station , Fresno , CA

Kings River Experimental Watersheds KREW. Pacific Southwest Research Station , Fresno , CA. 2012 Accomplishments. Snowmelt runoff and water yield along elevation and temperature gradients in California’s southern Sierra Nevada Journal of the American Water Resources Association

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Pacific Southwest Research Station , Fresno , CA

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  1. Kings River Experimental Watersheds KREW Pacific Southwest Research Station , Fresno, CA

  2. 2012 Accomplishments • Snowmelt runoff and water yield along elevation and temperature gradients in California’s southern Sierra Nevada • Journal of the American Water Resources Association • Sediment loads and erosion in forest headwater streams of the Sierra Nevada, California. • IN A.A. Webb, et al. Revisiting Experimental Catchment Studies in Forest Hydrology, IAHS Press • Controls of streamflow generation in small catchments across the snow-rain transition in the Southern Sierra Nevada, California • Hydrological Processes

  3. Goals of the KREWExperimental Watersheds • Understand processes and quantify variability of headwater stream ecosystems • Evaluate the effects of forest management for healthy forests • Prescribed fire • Thinning • Apply models

  4. Integrated Watershed Research • Hydrology • Meteorology • Air quality • Sediment & turbidity • Soils & geomorphology • Water chemistry • Biology • Stream macroinvertebrates • Algae • Riparian & upland vegetation • Yosemite toad

  5. What is the current/natural variability in headwater streams and their associated watershed characteristics ? • Why is this important ? • To evaluate the effects from • Changing climate • Forest management

  6. Stream Discharge Patterns and Sediment Loads

  7. Controls of Streamflow Generation • Endmembers identified from mixing models using Ca, Mg, K and Cl • Streamflow components • 60% subsurface flow • < 40% snowmelt runoff • < 6% fall storm runoff • Not significant • Regional groundwater and soil water in unsaturated zone • Regional groundwater and soil water in unsaturated zone

  8. Mixed-Bed Resin Lysimeters at KREW2 soil & 1 throughfall every 150 mNO3 & NH4annual fluxes

  9. Values at Nearby Sites

  10. N Deposition Levels in 2008

  11. NH4 Flux to Mineral SoilExtreme Values

  12. KREW Timeline • 2000 started building experimental site • WY 2003 data collection started • 2005-2006 added sites & instruments • 2007 SSCZO started • 2012 thin • 2013-2014 understory burns • Latest burn spring/summer 2014 • 2017 2ndburn ?

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