Title: Snowmelt runoff and water yield along elevation and temperature gradients in California's southern Sierra Nevada
Author: Hunsaker, Carolyn T.; Whitaker, Thomas W.; Bales, Roger C.
Source: Journal of the American Water Resources Association (JAWRA) 48(4): 667-678
Publication Series: Journal/Magazine Article (JRNL)
Description: Differences in hydrologic response across the rain-snow transition in the southern Sierra Nevada were studied in eight headwater catchments – the Kings River Experimental Watersheds – using continuous precipitation, snowpack, and streamflow measurements. The annual runoff ratio (discharge divided by precipitation) increased about 0.1 per 300 m of mean catchment elevation over the range 1,800-2,400 m. Higher-elevation catchments have lower vegetation density, shallow soils with rapid permeability, and a shorter growing season when compared with those at lower elevations. Average annual temperatures ranged from 6.8°C at 2,400 m to 8.6 at 1,950 m elevation, with annual precipitation being 75-95% snow at the highest elevations vs. 20-50% at the lowest. Peak discharge lagged peak snow accumulation on the order of 60 days at the higher elevations and 20 to 30 days at the lower elevations. Snowmelt dominated the daily streamflow cycle over a period of about 30 days in higher elevation catchments, followed by a 15-day transition to evapotranspiration dominating the daily streamflow cycle. Discharge from lower elevation catchments was rainfall dominated in spring, with the transition to evapotranspiration dominance being less distinct. Climate warming that results in a longer growing season and a shift from snow to rain would result in earlier runoff and a lower runoff ratio.
Keywords: forests, snow hydrology, watershed management, runoff ratio, Sierra Nevada, mountain hydrology, headwaters
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Hunsaker, Carolyn T.; Whitaker, Thomas W.; Bales, Roger C. 2012. Snowmelt runoff and water yield along elevation and temperature gradients in California's southern Sierra Nevada. Journal of the American Water Resources Association (JAWRA) 48(4): 667-678.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility