Water,
Год журнала:
2024,
Номер
16(20), С. 2892 - 2892
Опубликована: Окт. 11, 2024
Revealing
the
spatiotemporal
variation
in
baseflow
and
its
underlying
mechanisms
is
critical
for
preserving
health
ecological
functions
of
alpine
rivers,
but
this
has
rarely
been
conducted
source
region
Yangtze
River
(SRYR).
Our
study
employed
Soil
Water
Assessment
Tool
(SWAT)
model
coupled
with
two-parameter
digital
filtering
geostatistical
approaches
to
obtain
a
visual
representation
heterogeneity
characteristics
index
(BFI)
SRYR.
The
SWAT
multiple
linear
regression
(MLR)
were
used
quantitatively
estimate
contribution
climate
change
human
activities
BFI
changes.
results
underscore
robust
applicability
within
Temporally,
precipitation,
temperature,
exhibited
significant
upward
trends,
showed
contrasting
intra-annual
distribution
patterns,
which
unimodal
bimodal
distribution,
respectively.
Spatially,
increased
from
northwest
southeast,
watershed
perspective,
Tongtian
higher
values
compared
other
regions
Dangqu
greater
than
those
tributaries.
More
50%
entire
basin
had
an
annual
value
0.7,
indicates
that
was
major
contributor
runoff
generation.
Moreover,
contributions
variability
122%
−22%,
variability,
60%
40%.
Specifically,
precipitation
contributed
116%
variations,
while
temperature
6%
8%,
Overall,
it
concluded
distributions
are
controlled
by
various
factors,
main
factor
variation.
offers
valuable
insights
management
quantitative
assessment
groundwater
resources
SRYR
amidst
change.
Water,
Год журнала:
2023,
Номер
15(20), С. 3647 - 3647
Опубликована: Окт. 18, 2023
Baseflow
is
a
stable
part
of
streamflow
and
the
main
component
during
dry
season.
plays
an
important
role
in
water
cycle,
ecological
environment
protection
Yellow
River
basin
(YRB).
Taking
Zuli,
Kuye,
Tuwei
basins,
Jingle
sub-basin
as
examples,
baseflow
was
separated
using
recursive
digital
filtering
method.
The
intra-annual,
inter-annual,
chronological
characteristics
index
(BFI)
were
analyzed,
driving
factors
analyzed
from
perspective
climate-change
human-impact
factors.
results
showed
that:
(1)
annual
basins
mainly
declined,
trending
downward
all
four
test
while
BFI
increased
two
remained
nearly
constant
other
basins;
however,
distributions
more
uniform.
(2)
intra-annual
patterns
for
changes
between
earlier
later
periods.
(3)
Precipitation
soil
conservation
measures
primary
forces
change
basins.
influence
former
weakened
latter
strengthened,
coal
mining
Kuye
also
influenced
significantly.
(4)
When
normalized
difference
vegetation
(NDVI)
<
0.375,
watersheds
gradually
decreased
with
increase
NDVI.
0.375
NDVI
0.65,
underlying
surface
continued
to
improve.
>
rate
capacity
tended
be
stable.
Journal of Hydrology Regional Studies,
Год журнала:
2023,
Номер
50, С. 101527 - 101527
Опубликована: Сен. 15, 2023
The
Dawenhe
River
and
Xiaoqinghe
Basins
(116°21′–118°41′E,
35°43′–37°15′N)
in
the
center
of
North
China
Plain
(NCP),
China.
To
quantitatively
assess
influence
urbanization
(two
indicators
including
Impervious
Surface
Percentage
(ISP)
Average
Night
Light
Index
(ANLI))
on
baseflow
hydrological
behavior
(nine
signatures),
this
study
selects
typical
urbanized
catchment
sub-catchments)
within
central
NCP,
where
was
estimated
from
total
daily
streamflow
2006
to
2016.
Findings
show
that:
(i)
Baseflow
signatures
had
a
notable
spatial
variability,
which
magnitude
(Qb10,
Qb25,
Qb50,
Qb90),
(BFI),
Concavity
(CI),
Slope
duration
curve
(SBDC)
demonstrated
greater
values
north
versus
south.
(ii)
Both
ISP
ANLI
exhibited
an
upward
trend
over
time
with
some
fluctuations
(R2
>
0.65,
p
<
0.05).
For
ANLI,
there
were
higher
northwest
northeast
regions,
mainly
located
northern
region.
(iii)
Overall,
effects
two
catchment-variability,
model
performance
between
is
better
than
ANLI.
This
provides
scientific
reference
elucidate
water
balance
NCP
under
background
urbanization.
Journal of Hydrology Regional Studies,
Год журнала:
2023,
Номер
51, С. 101605 - 101605
Опубликована: Дек. 12, 2023
Study
Region:
The
Fenhe
River
Basin
(FRB)
is
an
important
tributary
of
the
Yellow
and
locate
in
a
semi-arid
semi-humid
region
northwest
China.
Over
past
four
decades,
significant
anthropogenic
activities
have
resulted
land
use
cover
change
(LUCC)
that
markedly
impacted
hydrological
processes
FRB.
Focus:
To
analyze
changes
under
multiple
historical
scenarios
from
LU1980
to
LU2015,
establish
Water
Energy
transfer
Processes
Large
basins
(WEP-L)
model
quantify
influences
LUCC
on
processes,
particularly
baseflow.
New
insights
for
region:
LU2015
14.5
%
increase
water
yield
(WY)
2.7
1.4
decrease
baseflow
(BF)
evapotranspiration,
respectively.
Urbanization
led
WY
reduction
BF,
exhibiting
strong
spatial
gradients
between
urban
centers
their
peripheries.
Increases
forestland
decreased
WY,
while
ET
showed
no
due
large
absolute
values
moisture
limitations.
Furthermore,
response
BF
forest
exhibits
variation.
A
negative
correlation
was
evident
upstream,
whereas
observed
downstream.
findings
this
study
offer
valuable
planning
sustainable
watershed
management
region.
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Март 1, 2024
Abstract
Studying
the
streamflow
characteristics
of
Yellow
River
mainstem
under
changing
environments
is
great
significance
to
management
and
sustainable
development
utilization
water
resources
in
its
basin.
In
this
paper,
a
long
short-term
memory
(LSTM)
model
used
restore
flow
mainstream
natural
conditions,
range
variation
approach
(RVA)
nonparametric
kernel
density
estimation
(KDE)
method
are
combined
quantitatively
assess
impact
environment
on
streamflow.
The
study
shows
that:
(1)
hydrological
variability
occurred
1985,
degree
ranged
from
26–58%,
which
moderate.
(2)
annual
ecological
value
ranges
560
~
1001
m
3
/s,
average
guarantee
43%;
(3)
Through
LSTM
simulation
(NSE
>
0.7,
R
2
0.8),
it
concluded
that
assurance
situation
higher
than
measured
value,
mainly
affected
by
human
activities,
contribution
rate
more
52%.
This
river
ecosystem
relatively
unstable
needs
further
management.
