HR: 0830h
AN: H51C-02    [Abstracts]
TI: Hydrologic Contributions of Springs to the Logan River, Utah
AU: * Gooseff, M N
EM: mgooseff@mines.edu
AF: Colorado School of Mines, Dept. of Geology & Geological Engineering 1516 Illinois St., Golden, CO 80401 United States
AU: Evans, J
EM: jpevans@cc.usu.edu
AF: Utah State University, Dept. of Geology, Logan, UT 84322 United States
AU: Kolesar, P
EM: petes@cc.usu.edu
AF: Utah State University, Dept. of Geology, Logan, UT 84322 United States
AU: Lachmar, T
EM: lachmar@cc.usu.edu
AF: Utah State University, Dept. of Geology, Logan, UT 84322 United States
AU: Payn, R
EM: robpayn@cc.usu.edu
AF: Utah State University, Dept. of Aquatic, Watershed, & Earth Resources, Logan, UT 84322 United States
AB: The Logan River flows through a fractured karst watershed of the Bear River mountain range in northern Utah, and provides significant water supply to the city of Logan, Utah. Springs flowing into the Logan River are important sources of water after annual snowmelt has been exhausted. In this work, we present results from a year of monitoring water chemistry and stable isotopes (D, 18O, and 13C) in two major springs and in the Logan River upstream and downstream of the combined spring inputs. The two springs, DeWitt and Spring Hollow, flow into the river within 1.5 km of each other. Annual patterns of Si and Mg suggest a flushing pattern, with reduced concentrations during snowmelt, and increasing concentrations throughout baseflow recession, at all for sampling locations. Cl concentrations are likewise greatly depressed after the snowmelt pulse but afterward remain consistently low at all four sites. Stable isotope data show that spring water is generally more enriched in D and 18O than river water, with an enriching pattern throughout annual stream flow recession.
UR: http://www.mines.edu/~mgooseff/web_research/loganriver.html
DE: 1040 Isotopic composition/chemistry
DE: 1831 Groundwater quality
DE: 1860 Runoff and streamflow
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2005 Joint Assembly