Hydrological Processes,
Journal Year:
2021,
Volume and Issue:
35(12)
Published: Oct. 30, 2021
Abstract
For
effective
water
quality
management
and
policy
development,
spatial
variability
in
the
mean
concentrations
dynamics
of
riverine
needs
to
be
understood.
Using
chemistry
(calcium,
electrical
conductivity,
nitrate‐nitrite,
soluble
reactive
phosphorus,
total
nitrogen,
phosphorus
suspended
solids)
data
for
up
578
locations
across
Australian
continent,
we
assessed
impact
climate
zones
(arid,
Mediterranean,
temperate,
subtropical,
tropical)
on
(i)
inter‐annual
concentration
(ii)
as
represented
by
constituent
export
regimes
(ratio
coefficients
variation
discharge)
patterns
(slope
concentration‐discharge
relationship).
We
found
that
vary
significantly
generally
exceeds
temporal
variability.
However,
are
consistent
zones.
This
suggests
intrinsic
properties
individual
constituents
rather
than
catchment
determine
patterns.
The
spatially
highlights
potential
predict
which
can
support
national
development.
Water,
Journal Year:
2024,
Volume and Issue:
16(18), P. 2628 - 2628
Published: Sept. 16, 2024
This
study
investigates
the
long-term
trends
(1992–2022)
of
nitrogen
and
phosphorus
loadings
exported
by
River
Po
to
Adriatic
Sea,
better
analyse
how
changes
in
hydrology
are
affecting
timing
magnitude
river
nutrient
loads.
We
used
30
years
monitoring
data
order
(a)
identify
main
temporal
patterns
their
interactions
at
a
decadal,
annual
seasonal
scale,
(b)
estimate
precipitation
effects
on
load
formation
evaluate
whether
which
extent
hydrological
regime
affects
export
across
(c)
monthly
scale
transport
dynamic
N
P
chemical
species
(hydrological
vs.
biogeochemical
control).
The
analysis
shows
general
decrease
both
loadings,
but
different
between
elements
species,
as
well
undergoing
variations.
found
statistically
significant
relationships
loads,
demonstrates
that
drive
intra-
interannual
time
scales
considered
this
study.
Precipitation-induced
trigger
deliveries
sea,
peaking
spring
autumn.
is
mainly
concentrated
summer
dry
period,
while
total
diminishes
mismatch
results
variable
molar
N:P
ratios
within
year.
extreme
drought
flood
events,
along
with
progressive
snowmelt
contribution
water
fluxes,
expected
exacerbate
variability
turn
perturbate
biodiversity,
food
webs
trophic
state
Northern
Sea.
Journal of Geophysical Research Biogeosciences,
Journal Year:
2025,
Volume and Issue:
130(4)
Published: March 27, 2025
Abstract
Headwater
streams
make
up
nearly
80%
of
the
stream
network
by
length
and
play
an
important
role
in
shaping
physical,
chemical,
biological
functions
downstream
waters.
In
Southeastern
US,
these
systems
are
beginning
to
experience
increases
frequency
duration
drying,
but
it
is
unclear
how
increased
drying
will
impact
water
quality.
To
begin
address
this
issue,
we
examined
nitrogen
dynamics
a
forested
headwater
across
annual
event.
The
event
was
divided
into
seasonal
wet
(March–June),
dry‐down
(June–October),
rewet
(November–March)
periods.
We
used
combination
quality
sensors
at
watershed
outlet,
spatially
distributed
synoptic
sampling
net
denitrification
conditions
physicochemical
variables
watershed,
series
potential
experiments
examine
variation
biogeochemical
state
At
nitrate
concentrations
were
positively
correlated
with
watershed‐scale
connectivity
during
period,
while
streamflow
period.
Throughout
varied
more
seasons
than
space,
greater
Further,
temperature,
nitrate,
ammonium
inversely
related
streamflow.
Finally,
measurements
confirmed
period
experienced
highest
rates.
Our
results
highlight
connection
between
humid
systems,
providing
key
information
for
developing
predictive
understanding
streams.
Hydrological Processes,
Journal Year:
2021,
Volume and Issue:
35(12)
Published: Oct. 30, 2021
Abstract
For
effective
water
quality
management
and
policy
development,
spatial
variability
in
the
mean
concentrations
dynamics
of
riverine
needs
to
be
understood.
Using
chemistry
(calcium,
electrical
conductivity,
nitrate‐nitrite,
soluble
reactive
phosphorus,
total
nitrogen,
phosphorus
suspended
solids)
data
for
up
578
locations
across
Australian
continent,
we
assessed
impact
climate
zones
(arid,
Mediterranean,
temperate,
subtropical,
tropical)
on
(i)
inter‐annual
concentration
(ii)
as
represented
by
constituent
export
regimes
(ratio
coefficients
variation
discharge)
patterns
(slope
concentration‐discharge
relationship).
We
found
that
vary
significantly
generally
exceeds
temporal
variability.
However,
are
consistent
zones.
This
suggests
intrinsic
properties
individual
constituents
rather
than
catchment
determine
patterns.
The
spatially
highlights
potential
predict
which
can
support
national
development.
