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T.C. Harmon [1,2] and S.M. Jepsen [1]

Catchment Scale Streamflow Response to Climate Variability in the Rain-Snow Transition Zone of California's Sierra Nevada Mountains. T.C. Harmon [1,2] and S.M. Jepsen [1]. CZO Annual Meeting, 20 August 2013. [1] Sierra Nevada Research Institute, University of California Merced, USA

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T.C. Harmon [1,2] and S.M. Jepsen [1]

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  1. Catchment Scale Streamflow Response to Climate Variability in the Rain-Snow Transition Zone of California's Sierra Nevada Mountains T.C. Harmon [1,2] and S.M. Jepsen [1] CZO Annual Meeting, 20 August 2013 [1] Sierra Nevada Research Institute, University of California Merced, USA [2] School of Engineering, University of California Merced, USA

  2. NSF WSC Project Aims/Methods Study Area - Providence Shaver Lake • WSC project extends from headwaters to the San Joaquin Valley floor (here, focus is on headwaters) • Integrated watershed model: PIHM (Penn State) • Tightly coupled surface water-groundwater interactions • Goal: Characterize catchment response to spatiotemporal changes in rainfall and snowmelt 5 km Providence sub-catchments

  3. Recent Results/Findings Upper Providence sub-catchment, water year 2006 • Adjustments made to hydrologic model (PIHM) to simulate desired snowmelt dynamics • Preliminary model results show stream discharge too late in year • Need earlier modeled runoff Ideas to test in model: • Increase hydraulic conductivity? • Simulate horizontal macropores? • Decrease snowfall:rainfall ratio? • Nonuniform soil and snow depths? SWE (m) Stream discharge (104 m3/day) Day of water year 2006

  4. Proposed Aims/Methods for Improved Model Output Incorporate interface to facilitate model calibration, e.g.: • Finalize model calibration protocols leveraging computational cluster • Compare outcomes with RHESSys? • Analyze sensitivity of flow paths (overland, groundwater) to soil parameters and model forcings • Explore idea of adding spatially distributed snowmelt: • Available input: snow pillows, pingers, and lidar products • Incorporate separate snowmelt model? (e.g., ISNOBAL) . . .

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