11-SierraSnowHistory

11-SierraSnowHistory - 3/26/2008 Historical Trends in the...

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3/26/2008 Trends in California snow data for Tom's class 1 Historical Trends in the Sierra Nevada Snow Cover (work in progress) Jeff Dozier California’s Largest Reservoir ± Average April 1 st snow water equivalent volume: 15-25km 3 (~5 x Lake Shasta) ± 50-70% of annual 2 river discharge ± Supplies ~50% of California’s net water demand for agriculture and urban areas Manual measurement of SWE (snow water equivalent) 3 Automated measurement with snow pillow 4 Snow-pillow data for Dana Meadows and Tuolumne Meadows 1200 1400 1600 1800 1983 TUM 1983 DAN 10/01 11/01 12/01 01/01 02/01 03/01 04/01 05/01 06/01 07/01 0 200 400 600 800 1000 2003 2003 2005 2005 SWE, mm Accumulation and ablation inferred from snow pillow data, Tuolumne Meadows and Dana Meadows 6
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3/26/2008 Trends in California snow data for Tom's class 2 Example forecast for April-July 2006 from Calif DWR ( http://cdec.water.ca.gov/snow/bulletin120/ ) Kings River at Pine Flat Reservoir (10 6 acre-ft capacity) historical values 50-yr mean max min 10 6 1 234 3113 0 274 7 acre-ft 1.234 3.113 0.274 expected % of avg 80% prob range Feb 1 1.37 111% 0.93 1.96 Mar 1 1.21 98% 0.89 1.67
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This note was uploaded on 08/06/2008 for the course ESM 236 taught by Professor Dozier during the Spring '08 term at UCSB.

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11-SierraSnowHistory - 3/26/2008 Historical Trends in the...

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