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Your
query was:
an="H23C-1438"
HR: 1340h
AN: H23C-1438
TI: Steam flow
generation in semi-arid, forested and seasonally snow-covered catchments,
Valles Caldera, New Mexico
AU: * Liu, F
EM: fliu@ucmerced.edu
AF: School of Engineering, University of
California, Merced, P. O. B. 2039, Merced, CA 95344 United States
AU: Bales, R C
EM: rbales@ucmerced.edu
AF: School of Engineering, University of
California, Merced, P. O. B. 2039, Merced, CA 95344 United States
AU: Conklin, M H
EM: mconklin@ucmerced.edu
AF: School of Engineering, University of
California, Merced, P. O. B. 2039, Merced, CA 95344 United States
AU: Kostrzewski, J M
EM: jenk@hwr.arizona.edu
AF: Department of Hydrology and Water Resources,
University of Arizona, Marshall Building, Tucson, AZ 85721 United States
AB: Stream flow generation is poorly understood for
semi-arid, forested and seasonally snow-covered catchments in southwest US.
Here we report on initial results of a pioneer study on source waters and
flowpaths using isotopic and geochemical tracers in two streams originated
from Redondo Peak in Valles Caldera, New Mexico. The Valles Caldera is the
latest collapse feature in the volcanic field and hosts high-temperature
hydrothermal systems with several geothermal springs. It is currently covered
by ponderosa pine in lower elevations and mixed conifer in higher elevations.
Samples were collected from snow, hillslope groundwater, and stream water at
Redondo Creek and La Jara Creek from December 2004 to July 2005. Using
diagnostic tools of mixing models and end-member mixing analysis, it is
suggested that stream water quantity and quality at Redondo Creek were
primarily controlled by mixing of two end-members: hillslope subsurface water
and geothermal springs. Hillslope subsurface water was sourced from snowmelt
and then gradually released to stream flow through spring and summer.
Infiltration-excess overland flow of snowmelt did not appear to occur.
Contribution of hillslope subsurface water to stream flow was 90% on average
from December 2004 to July 2005 and its percentage gradually increased from
spring to summer with increase in discharge. Contribution of geothermal
springs decreased on percentage over season with a peak (20%) in late march
and lowest but relatively constant value (5%) through June and July. Stream
flow generation at La Jara Creek was relatively simple, all from hillslope
subsurface water. This information may improve our understanding of changes
of hydrological and biogeochemical cycles in response to climate warming in
these and similar catchments in southwest US.
DE: 1806 Chemistry of fresh water
DE: 1829 Groundwater hydrology
DE: 1860 Streamflow
SC: Hydrology [H]
MN: Fall Meeting 2005
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