Hidden Features: How Subsurface and Landscape Heterogeneity Govern Hydrologic Connectivity and Stream Chemistry in a Montane Watershed
Hydrological Processes,
Journal Year:
2025,
Volume and Issue:
39(3)
Published: March 1, 2025
ABSTRACT
Hydrologic
connectivity
is
defined
as
the
connection
among
stores
of
water
within
a
watershed
and
controls
flux
solutes
from
subsurface
to
stream.
difficult
quantify
because
it
goverened
by
heterogeniety
in
storage
permeability
responds
seasonal
changes
precipitation
inputs
moisture
conditions.
How
interannual
climate
variability
impacts
hydrologic
connectivity,
thus
stream
flow
generation
chemistry,
remains
unclear.
Using
rare,
four‐year
synoptic
chemistry
dataset,
we
evaluated
shifts
source
Coal
Creek,
montane,
headwater
tributary
Upper
Colorado
River.
We
leveraged
compositional
principal
component
analysis
end‐member
mixing
evaluate
how
variation
conditions
chemistry.
Overall,
three
main
findings
emerged
this
work.
First,
geochemically
distinct
end
members
were
identified
that
constrained
chemistry:
reach
inflows,
quick
slow
groundwater
contributions.
Reach
inflows
impacted
historic
base
precious
metal
mine
inputs.
Bedrock
fractures
facilitated
much
transport
higher‐storage
features
(e.g.,
alluvial
fans)
groundwater.
Second,
contributions
different
changed
over
summer.
In
early
summer,
was
composed
all
members,
while
late
predominantly
Finally,
observed
minimal
differences
proportional
composition
across
four
years,
indicating
spatial
heterogeneity
landscape
geologic
had
greater
influence
than
fluctuation
on
These
indicate
mechanisms
controlling
solute
path
activation)
may
be
resilient
(i.e.,
able
rebound
after
perturbations)
predicted
increases
variability.
By
establishing
framework
for
assessing
variable
conditions,
our
study
offers
method
biogeochemical
resilience
variations
hydrometeorological
Language: Английский
Mechanisms of climate-induced lake dynamics in the Source Region of Three Rivers, Tibetan Plateau
Xiafei Zheng,
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S. Liang,
No information about this author
Dezhao Yan
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et al.
Journal of Hydrology Regional Studies,
Journal Year:
2025,
Volume and Issue:
59, P. 102323 - 102323
Published: March 22, 2025
Language: Английский
Controls From Above and Below: Snow, Soil, and Steepness Drive Diverging Trends of Subsurface Water and Streamflow Dynamics
Devon Kerins,
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Abigail S. Knapp,
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Fiona S. Liu
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et al.
Hydrological Processes,
Journal Year:
2025,
Volume and Issue:
39(4)
Published: April 1, 2025
ABSTRACT
The
importance
of
subsurface
water
dynamics,
such
as
storage
and
flow
partitioning,
is
well
recognised.
Yet,
our
understanding
their
drivers
links
to
streamflow
generation
has
remained
elusive,
especially
in
small
headwater
streams
that
are
often
data‐limited
but
crucial
for
downstream
quantity
quality.
Large‐scale
analyses
have
focused
on
characteristics
across
rivers
with
varying
drainage
areas,
overlooking
the
dynamics
shape
behaviour.
Here
we
ask
question:
What
climate
landscape
regulate
dynamic
storage,
path
streams?
To
answer
this
question,
used
data
a
widely‐used
hydrological
model
(HBV)
15
catchments
contiguous
United
States.
Results
show
aridity
precipitation
phase
(snow
or
rain)
land
attributes
topography
soil
texture
key
dynamics.
In
particular,
steeper
slopes
generally
promoted
more
streamflow,
regardless
aridity.
Streams
flat,
rainy
sites
(<
30%
snow)
finer
soils
exhibited
flashier
regimes
than
those
snowy
(>
coarse
deeper
paths.
sites,
less
weathered,
thinner
shallower
paths
discharge
was
sensitive
changes
snow
dampened
flashiness
overall.
here
indicate
steepness
modify
shallow
deep
ultimately
regulating
response
forcing.
As
change
increases
uncertainty
availability,
interacting
features
will
be
essential
predict
shifts
improve
resources
management.
Language: Английский
Natural and anthropogenic factors controlling hydrogeochemical processes in a fractured granite bedrock aquifer, Korea
Jiyun Kim,
No information about this author
Jaeyeon Kim,
No information about this author
Dugin Kaown
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et al.
Environmental Monitoring and Assessment,
Journal Year:
2025,
Volume and Issue:
197(5)
Published: April 30, 2025
Language: Английский
Stream chemical response is mediated by hydrologic connectivity and fire severity in a Pacific Northwest forest
Hydrological Processes,
Journal Year:
2024,
Volume and Issue:
38(7)
Published: July 1, 2024
Abstract
Large‐scale
wildfires
are
becoming
increasingly
common
in
the
wet
forests
of
Pacific
Northwest
(USA),
with
predicted
increases
fire
prevalence
under
future
climate
scenarios.
Wildfires
can
alter
streamflow
response
to
precipitation
and
mobilize
water
quality
constituents,
which
pose
a
risk
aquatic
ecosystems
downstream
drinking
treatment.
Research
often
focuses
on
impacts
high‐severity
wildfires,
stream
biogeochemical
responses
low‐
mixed‐severity
fires
understudied,
particularly
during
seasonal
shifts
hydrologic
connectivity
between
hillslopes
streams.
We
studied
2020
Holiday
Farm
Fire
at
HJ
Andrews
Experimental
Forest
where
rare
pre‐fire
discharge
chemistry
data
allowed
us
evaluate
influence
quantity
quality.
Our
research
design
focused
two
well‐studied
watersheds
low
low‐moderate
burn
severity
we
examined
long‐term
(pre‐
post‐fire),
instantaneous
grab
samples
collected
four
rain
events
occurring
immediately
following
wildfire
prolonged
dry
summer.
analysed
impact
these
events,
represent
transition
from
low‐to‐high
subsurface
stream,
behaviour.
Long‐term
revealed
total
annual
flows
mean
remained
fairly
consistent
post‐fire,
while
small
baseflow
were
observed
low‐moderately
burned
watershed.
Stream
concentrations
nitrate,
phosphate
sulfate
significantly
increased
fire,
variance
concentration
increasing
severity.
end
member
mixing
models
suggested
that
watershed
had
greater
inputs
soil
groundwater
times
compared
fire.
Finally,
differences
concentration‐discharge
relationships
biogenic
solutes
most
expressed
catchment
conditions.
study
provides
insights
into
post‐wildfire
quality,
goal
informing
low,
moderate
mixed
wildfire.
Language: Английский