EarthArXiv (California Digital Library),
Год журнала:
2023,
Номер
unknown
Опубликована: Фев. 10, 2023
Non-perennial
streams,
which
lack
year-round
flow,
are
widespread
globally.
Identifying
the
sources
of
water
that
sustain
flow
in
non-perennial
streams
is
necessary
to
understand
their
potential
impacts
on
downstream
resources,
and
guide
policy
management.
Here,
we
used
isotopes
(δ18O
δ2H)
two
different
modeling
approaches
investigate
spatiotemporal
dynamics
young
fractions
(Fyw)
a
stream
network
at
Konza
Prairie
(KS,
USA)
during
2021
summer
dry-down
season,
as
well
over
several
years
with
varying
hydrometeorological
conditions.
Using
Bayesian
model,
found
substantial
amount
(Fyw:
39.1
62.6%)
sustained
flows
headwaters
catchment
outlet
year,
while
2015-2022
contributions
estimated
using
sinusoidal
models
indicated
smaller
Fyw
amounts
(15.3%
±
5.7).
Both
indicate
releases
highly
sensitive
hydrological
conditions,
streamwater
shifting
older
dries.
The
shift
age
suggests
away
from
rapid
fracture
towards
slower
matrix
creates
but
localized
surface
presence
late
reflected
annual
outlet.
proportion
highlights
vulnerability
short-term
hydroclimatic
change,
late-summer
reveals
sensitivity
longer-term
changes
groundwater
dynamics.
Combined,
this
local
may
propagate
through
networks
influence
availability
quality.
Sustainability,
Год журнала:
2024,
Номер
16(23), С. 10543 - 10543
Опубликована: Дек. 1, 2024
The
proportion
of
non-perennial
rivers
within
the
global
river
network
is
increasing,
and
research
on
these
has
significantly
grown
in
recent
years
due
to
their
important
role
water
resource
management
ecosystems.
However,
existing
identification
methods
primarily
rely
networks
with
monitoring
data
often
overlook
temporal
variation
flow,
limiting
further
analysis.
We
propose
a
novel
approach
that
couples
WEP-L
model
random
forest
prediction,
based
comprehensive
analysis
limitations
current
methods.
Specifically,
this
method
involves
simulating
flow
incorporating
time-series
forecasting
facilitate
rivers.
This
also
divides
into
seasonal
non-significantly
by
analysis,
providing
theoretical
foundation
for
studying
causes
formulating
conservation
strategies.
Using
Yellow
River
basin
Gansu
province
as
case
study,
results
indicate
total
length
13,085.67
km,
accounting
42.09%
region’s
length.
cessation
periods
significant
are
fall
winter,
while
concentrated
summer.
findings
provide
valuable
guidance
ecological
sustainable
rivers,
both
other
regions.
introduction
application
expected
improve
contributing
long-term
sustainability
resources.
Climate
is
probably
the
most
important
factor
affecting
river
discharge
and
flow
dynamics.
Low
flows
in
rivers
during
warm
period
cause
stress
to
aquatic
ecosystems
pose
a
challenge
sustainable
water
management.
Previous
research
has
shown
that
average
minimum
of
30
driest
continuous
days,
known
as
Q30,
suitable
measure
for
ecological
estimation
Lithuania.
This
study
aims
examine
whether
large-scale
atmospheric
processes,
so-called
teleconnections,
can
have
an
impact
on
Q30
period.
Hydrological
data
1961–2020
from
25
gauging
stations
were
used
search
hydrological
response
signals
with
five
selected
climate
indices
(NAO,
SCA,
POL,
EA/WR,
EA).
Pearson
correlation
Wilcoxon–Mann–Whitney
test
approaches
applied.
The
results
suggested
EA/WR
NAO
had
strongest
influence
studied
region
positive
phases
tended
greater
decrease
values
due
prevailing
easterly
edge
anticyclonic
circulation
over
determined
by
indices,
while
negative
mentioned
caused
increase
dispersion
Q30.
EarthArXiv (California Digital Library),
Год журнала:
2023,
Номер
unknown
Опубликована: Фев. 10, 2023
Non-perennial
streams,
which
lack
year-round
flow,
are
widespread
globally.
Identifying
the
sources
of
water
that
sustain
flow
in
non-perennial
streams
is
necessary
to
understand
their
potential
impacts
on
downstream
resources,
and
guide
policy
management.
Here,
we
used
isotopes
(δ18O
δ2H)
two
different
modeling
approaches
investigate
spatiotemporal
dynamics
young
fractions
(Fyw)
a
stream
network
at
Konza
Prairie
(KS,
USA)
during
2021
summer
dry-down
season,
as
well
over
several
years
with
varying
hydrometeorological
conditions.
Using
Bayesian
model,
found
substantial
amount
(Fyw:
39.1
62.6%)
sustained
flows
headwaters
catchment
outlet
year,
while
2015-2022
contributions
estimated
using
sinusoidal
models
indicated
smaller
Fyw
amounts
(15.3%
±
5.7).
Both
indicate
releases
highly
sensitive
hydrological
conditions,
streamwater
shifting
older
dries.
The
shift
age
suggests
away
from
rapid
fracture
towards
slower
matrix
creates
but
localized
surface
presence
late
reflected
annual
outlet.
proportion
highlights
vulnerability
short-term
hydroclimatic
change,
late-summer
reveals
sensitivity
longer-term
changes
groundwater
dynamics.
Combined,
this
local
may
propagate
through
networks
influence
availability
quality.
