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GEOCHEMISTRY AND CHEMICAL DYNAMICS OF THE TRUCKEE RIVER BASIN SOLOMON, Evan A., POULSON, Simon R.,
 

Summary: GEOCHEMISTRY AND CHEMICAL DYNAMICS OF THE
TRUCKEE RIVER BASIN SOLOMON, Evan A., POULSON, Simon R.,
TEMPEL, Regina N., and AREHART, Greg B., Dept. Geological Sciences MS-172, Univ of
Nevada, Reno, Reno, NV 89557, esolomon@scs.unr.edu
The Truckee River is a perennial water system with headwaters originating in the eastern Sierra
Nevada. The basin is hydrologically closed and the river terminates at Pyramid Lake, Nevada,
which is northeast of the Reno-Sparks area. The objective of this study is to understand the
chemical dynamics of the Truckee River system over time and space, along with a quantification
of a hydrogen isotope budget as it pertains to evaporation rates along the river and the mixing
dynamics of the river from different sources. Data were collected at ten different stations along
the river from Farad, CA to Pyramid Lake, NV. Currently, the data is being coupled with historic
stream flow, water chemistry, and isotopic data to analyze long-term changes in the chemical and
hydrologic regime of the river. The historic data are also being analyzed for trends in chemical
and isotopic fluctuation due to seasonal variations on a yearly basis, as well as for changes in
water quality due to urban-growth in surrounding areas.
Preliminary results indicate that conductivity, alkalinity, and pH show a general increase in a
downstream direction, while D shows a small shift to isotopically lighter values in a
downstream direction. Specific conductivity increases abruptly between Reno and Lockwood,
which may be a function of discharge into the Truckee from the Steamboat Ditch, Pioneer Ditch,
Reno Sewage Disposal Facilities, and the North Truckee Drain. There is also a sharp increase in

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences