Watershed Ecology and the Environment,
Год журнала:
2023,
Номер
5, С. 100 - 107
Опубликована: Янв. 1, 2023
Due
to
the
dual
impacts
of
anthropogenic
disturbances
and
climate
change,
tidal
hydrodynamics
estuaries
have
been
intensively
investigated
for
their
potential
increase
flood
risk
devastate
coastal
habitats
human
communities.
Climate
change
leads
rises
in
sea
levels,
which
can
amplify
regional
tides
ranges.
This
study
takes
estuarine
area
Pearl
River
(PRE),
one
fastest-developed
China,
as
an
example
explore
effects
land
cover
changes
level
rise
on
dynamics.
Annual
mean
levels
were
collected
at
26
major
hydrological
stations
from
five
rivers/waterways.
To
better
understand
temporal
we
analyzed
trends
periodic
patterns
through
linear
regression
Complex
Morlet
wavelet
analyses.
For
main
outlet,
where
conversion
agricultural
urban
use
had
primarily
taking
place,
significantly
affected
by
increased
built-up
areas
decreased
cultivated
areas.
On
other
hand,
middle
upper
reaches
Xi
Shunde-Hengmen
Waterway,
observed
with
decreases
lands.
No
significant
correlations
found
between
annual
downstream
rivers.
Instead,
locations
close
coastline
more
related
rise,
average
0.002
m
per
year
increase.
highlighted
importance
activity
A
systematic
understanding
estuary
is
expected
help
enhance
mechanisms
hydrology,
could
serve
basis
improving
management
practice
regions
coping
protection.
Environmental Modelling & Software,
Год журнала:
2022,
Номер
156, С. 105470 - 105470
Опубликована: Июль 31, 2022
Fragmentation
affects
river
ecosystems
worldwide
by
dampening
the
movement
and
dispersal
of
aquatic
organisms
material
(such
as
sediment,
water,
nutrients)
across
network.
In
this
paper,
we
develop
connectivity
indices
to
explain
biodiversity
patterns,
prioritize
reaches
that
need
habitat
restoration
barriers
improvement.
We
provide
a
general
framework
for
calculating
disentangling
contribution
network's
physical
setup
(structural
connectivity)
from
process-driven
biota-related
(functional
connectivity).
To
facilitate
calculations,
R
package
‘riverconn’
is
introduced.
A
prioritization
habitats
carried
out
Ebro
(North-West
Iberian
Peninsula)
using
setups
accounting
different
classes
traits.
Resulting
prioritizations
are
very
diverse.
‘Riverconn’
can
support
scientists
managers
working
on
riverscape
planning
population
community
ecology
providing
means
compute
compare
wide
array
fragmentation
indices.
Ecological Indicators,
Год журнала:
2022,
Номер
146, С. 109848 - 109848
Опубликована: Дек. 30, 2022
River
network
connectivity
is
a
key
factor
affecting
watershed
ecosystems
and
an
important
criterion
for
evaluating
the
health
of
river.
The
river
structure
basin
has
changed
dramatically
in
recent
years
due
to
human
activity,
but
response
changes
physical
still
poorly
understood.
In
this
paper,
dynamic
index
(connectivity
index)
based
on
daily-scale
flow
probability
density
function
proposed
characterize
capacity
networks.
Haihe
China
selected
as
study
area,
graphic
model
constructed
assess
evolutionary
network.
54
sections
were
classified
into
Low
impact
(LHI)
High
(HHI),
trends
causes
with
evolution
analyzed.
results
reveal
that
degree
clustering
coefficient
keep
increasing,
path
length
decreases
becomes
more
dense
downstream,
gradually
evolves
"small-world"
characteristics
improve
potential
efficiency
specific
functionality
network,
make
mismatch
hydraulic
gradient,
disperses
severely,
leading
significant
decrease
(HHI
lower
than
LHI
52.1%).
Moreover,
structural
enhance
spatial
temporal
differences
hydrological
connectivity,
which
further
restricts
system.
"Small-world"
indicators
(duration,
start
time,
intermittency)
show
strong
correlations.
Therefore,
influencing
planning
management
should
consider
caused
by
modifications
Hydrological Sciences Journal,
Год журнала:
2022,
Номер
68(2), С. 276 - 289
Опубликована: Дек. 6, 2022
Non-perennial
rivers
and
streams
are
ubiquitous.
Nonetheless,
our
understanding
of
their
hydrological
patterns
is
minimal.
Hydrological
models
powerful
tools
to
study
characterize
patterns,
but
few
can
simulate
extremes
such
as
non-flow
events.
We
aimed
capture
accurately
the
flow
intermittency
spatial
temporal
in
a
Mediterranean
river
basin
with
restructured
Soil
Water
Assessment
Tool
(SWAT+).
calibrated
model
using
multi-objective
optimization
algorithm
data
from
two
gauging
stations
mainstream
for
period
2000–2020.
Furthermore,
we
validated
simulations
against
stage
series
at
14
stations.
The
results
indicated
that
simulates
low
flows
period.
observed
significant
variation
both
space
time
remarkable
inter-annual
variability.
also
an
increase
over
Frontiers in Marine Science,
Год журнала:
2023,
Номер
10
Опубликована: Янв. 24, 2023
Introduction
Recently,
accelerated
sea-level
rise
(SLR)
has
raised
major
concerns
on
estuarine
management
and
restoration
because
it
modifies
hydrodynamics,
such
as
tidal
inundation
extent
amplitude,
current
asymmetry,
flood
frequency,
etc.
Understanding
underlying
processes
which
regulate
dynamics
is
critical
for
mitigating
potential
impacts
the
coastal
population
development.
Methods
We
selected
Pearl
River
Estuary
(PRE),
an
estuary
with
a
higher
regional
SLR
compared
to
global
study
area.
To
identify
effects
of
dynamics,
we
analyzed
long-term
records
four
variables
from
19
gauge
stations
between
1952
2020,
including
annual
highest
levels
(AHTLs),
lowest
(ALTLs),
mean
ranges
(AMTRs),
(AMTLs).
Results
suggested
that
variability
in
was
site-specific.
The
AMTRs
decreased
gradually
offshore
regions
upper
reaches
rivers
maximum
at
mouth
estuary.
In
contrast,
magnitudes
AHTLs,
AMTLs,
ALTLs
when
approaching
coastline.
Distance
coastline
had
correlations
ALTLs,
followed
by
river
width
depth.
local
responsible
temporal
AMTLs
correlation
coefficients
0.43
0.85
(P
<
0.001)
but
showed
low
these
three
>
0.001).
Instead,
were
highly
correlated
discharge
rivers,
especially
AHTLs
(correlation
coefficient
=
0.83,
P
0.0001).
Conclusions
Our
demonstrated
demonstrate
significant
spatial-temporal
variability.
Geomorphology,
discharge,
sea
have
jointly
affected
hydrodynamics.
