Hydrological Processes,
Journal Year:
2023,
Volume and Issue:
37(4)
Published: April 1, 2023
Abstract
Concentration‐discharge
(C‐Q)
relationship
in
streamflow
provides
insights
into
hydrological
transport
at
the
catchment
scale.
Changes
connectivity
during
runoff
events
often
dominate
flood
and
solute
export
karst
catchment.
However,
only
few
studies
have
explored
intra‐event
C‐Q
relationships
how
they
are
affected
by
In
this
study,
we
underground
channel
flows
integrating
concentration,
discharge
modelled
flow
age
a
1.25
km
2
southwest
China.
We
apply
piecewise
functions
to
characterize
on
rising
falling
limbs
of
hydrograph.
Geogenic
solutes
exhibited
dilution
patterns
event,
which
could
be
fitted
two
power‐law
models
with
different
coefficients
limbs.
Affected
strong
between
surface
subsurface,
hillslope
depression,
steeper
slope
limb
indicated
an
exhaustible,
proximal
source,
that
is,
groundwater.
contrast,
soil
enriched
changed
from
enrichment
event.
The
pattern
occurring
early
was
caused
distal
plentiful
sources
water.
Whilst
depression
latter
limb.
On
hydrograph,
implied
small
fractures
another
source
zone
soil‐enriched
addition
layer
depression.
behaviours
can
combination
parabola
model
power
law
for
limbs,
respectively.
current
study
highlights
variations
Which
is
crucial
assession
hydrochemical
processes
fertilization
management
area.
Hydrological Processes,
Journal Year:
2023,
Volume and Issue:
37(2)
Published: Jan. 24, 2023
Abstract
Landscape
organized
(or
structured)
heterogeneity
influences
hydrological
and
biogeochemical
patterns
across
space
time.
We
developed
landscape
indices
that
describe
the
spatial
configuration
of
nutrient
sources
sinks
as
a
function
their
distance
to
stream
(lateral
dimension)
or
outlet
(longitudinal
intersection
with
flow‐accumulation
areas.
Using
monthly
nitrate,
total
phosphorus
(TP),
soluble
reactive
(SRP)
daily
discharge
(Q)
data
from
221
rural
catchments
(1–300
km
2
)
2010–2020,
we
observed
higher
variability
in
flow‐weighted
mean
concentrations
smaller
than
larger
ones.
The
configurations
also
decreased
increasing
catchment
size.
A
index,
calculated
arable
land
use
weighted
by
on
flow
accumulation,
improved
prediction
TP
SRP,
but
not
compared
unweighted
use.
conclude
transfer
more
nitrate
transfer,
zones
riparian
areas
are
critical
source
for
respectively.
By
contrast,
lateral
(upslope–downslope)
longitudinal
(upstream–downstream)
dimensions
did
have
an
identifiable
influence
nutrients
temporal
dynamics.
this
study
can
help
design
landscapes
minimize
diffuse
losses
streams
show
management
is
first
order
control
losses.
The Science of The Total Environment,
Journal Year:
2024,
Volume and Issue:
951, P. 175365 - 175365
Published: Aug. 6, 2024
Climate
change
is
expected
to
significantly
deteriorate
water
quality
in
heavily
managed
agricultural
landscapes,
however,
the
exact
mechanisms
of
these
impacts
are
unknown.
In
this
study
we
adopted
a
modelling
approach
predict
multiple
effects
climate
on
hydrological
and
biogeochemical
responses
for
dominant
solutes
particulates
two
agriculture-dominated
temperate
headwater
catchments.
We
used
climatic
projections
from
three
models
simulate
future
flows,
mobilisation
delivery
particulates.
This
allowed
an
examination
potential
drivers
by
identifying
changes
flow
pathway
distribution
key
environmental
variables.
found
that
conditions
will
lead
general
increase
stream
discharge
as
well
higher
concentrations
loads
However,
unlike
previous
studies,
observed
magnitude
during
warmer
part
year.
These
reduce
relative
importance
winter
flows
solute
particulate
transport,
leading
both
more
evenly
distributed
between
seasons.
linked
superficial
pathways
tile
surface
runoff
driven
rapid
transition
extremely
wet
dry
conditions.
Overall,
widespread
deterioration.
Mitigation
deterioration
would
require
adequate
management
efforts
address
direct
indirect
negative
biota
scarcity.
Hydrological Processes,
Journal Year:
2024,
Volume and Issue:
38(11)
Published: Nov. 1, 2024
ABSTRACT
We
investigate
how
seasonal
flow
variations
and
a
climatic
regime
that
is
dominated
by
the
El
Niño–Southern
Oscillation
(ENSO)
influence
Sb
flux
dynamics
in
an
Australian
river
impacted
mining.
Sampling
(
n
=
496)
spans
hydrologically
complex
7‐year
period
of
drought,
bushfires
floods
from
2016
to
2023,
during
which
17%
samples
exceeded
drinking
water
guideline
concentration
(3
μg
L
−1
).
Aqueous
(Sb
Aq
)
concentration–discharge
C
–
Q
relationships
are
non‐continuous/non‐linear
across
range,
with
chemodynamic
behaviour
at
moderate
flows
reflecting
hydrological
connection
primary
Sb‐source
area
combined
variable
dilution.
In
contrast
chemostatic
occurred
extreme
low
high
flows,
disconnection
source
persistent
dilution,
respectively.
was
significantly
positively
correlated
p
<
0.01,
Spearman's
ρ
0.58)
index
representing
proportional
contribution
sub‐catchment
mineral‐field
area,
suggesting
sufficient
localised
rainfall
mining‐impacted
contributes
downstream
peaks
concentrations.
particulate
P
annual
loads
study
spanned
24–5174
1.2–2820
kg,
respectively
were
strongly
dependant
interannual
variability
dry
wet
years.
extrapolate
daily
load‐daily
discharge
d
for
estimate
over
53‐year
(1970–2023)
continuous
data
(mean
total
1865
kg
±
[SE]
247).
Positive
correlations
between
Southern
Index
both
0.05)
53
years
suggests
ENSO
fluctuations
transport
dynamics.
Upstream
load
estimates
correspond
coastal
floodplain
sedimentary
mass,
approximately
10%–45%
estimated
exported
since
1880
accumulated
on
Macleay
floodplain.
Data
suggest
current
rates
export,
complete
flushing‐leaching
mine
tailings‐derived
upper
catchment
may
take
order
600–1000
Hydrological Processes,
Journal Year:
2023,
Volume and Issue:
37(4)
Published: April 1, 2023
Abstract
Concentration‐discharge
(C‐Q)
relationship
in
streamflow
provides
insights
into
hydrological
transport
at
the
catchment
scale.
Changes
connectivity
during
runoff
events
often
dominate
flood
and
solute
export
karst
catchment.
However,
only
few
studies
have
explored
intra‐event
C‐Q
relationships
how
they
are
affected
by
In
this
study,
we
underground
channel
flows
integrating
concentration,
discharge
modelled
flow
age
a
1.25
km
2
southwest
China.
We
apply
piecewise
functions
to
characterize
on
rising
falling
limbs
of
hydrograph.
Geogenic
solutes
exhibited
dilution
patterns
event,
which
could
be
fitted
two
power‐law
models
with
different
coefficients
limbs.
Affected
strong
between
surface
subsurface,
hillslope
depression,
steeper
slope
limb
indicated
an
exhaustible,
proximal
source,
that
is,
groundwater.
contrast,
soil
enriched
changed
from
enrichment
event.
The
pattern
occurring
early
was
caused
distal
plentiful
sources
water.
Whilst
depression
latter
limb.
On
hydrograph,
implied
small
fractures
another
source
zone
soil‐enriched
addition
layer
depression.
behaviours
can
combination
parabola
model
power
law
for
limbs,
respectively.
current
study
highlights
variations
Which
is
crucial
assession
hydrochemical
processes
fertilization
management
area.
