Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Dec. 12, 2023
Abstract
Under
the
backdrop
of
increasing
water
utilization,
river
ecosystem
problems
continue
to
emerge.
Determining
ecological
flow
rivers
is
one
keys
comprehensive
restoration
ecosystems.
This
paper
determines
operability
runoff
sequences
by
means
Mann-Kendal
test,
quantifies
minimum
through
five
representative
hydrological
methods,
including
Intra-year
distribution
(IYD),
Flow
during
curve
(FDC),
Q90,
Monthly
average
(MMAF)
and
Average
in
driest
month
(AFDM),
calculates
suitable
monthly
frequency
(M-F)
method
three
different
scenarios.
In
addition,
a
comparison
methods
made
from
various
aspects
give
recommended
methods.
Taking
Shaying
River
basin
as
research
objects,
AFDM
achieves
best
satisfaction
terms
demand,
Q90
FDC
have
highest
level,
IYD
meet
requirements
rhythms.
The
derived
M-F
under
Scenario
optimally
satisfactory
all
respects.
It
determine
processes
result
scenario
b,
respectively.
study
can
be
used
provide
scientific
effective
reference
basis
for
integrated
management.
Water,
Journal Year:
2024,
Volume and Issue:
16(3), P. 420 - 420
Published: Jan. 27, 2024
Optimizing
the
land
use
structure
is
one
of
most
effective
means
improving
surface
water
aquatic
environment.
The
relationship
between
patterns
and
quality
complex
due
to
influence
dams
sluices.
To
further
investigate
impact
on
in
different
basins,
we
Shaying
River
as
an
example,
which
a
typical
tributary
Huai
Basin.
Utilizing
2020
data
monitoring
from
two
periods,
this
study
employs
GIS
spatial
analysis,
Random
Forest
Model,
redundancy
Partial
Least-Squares
Regression
quantitatively
explore
how
different-scale
buffer
zone
quality.
key
findings
include:
(1)
notable
seasonal
differences
indicators
within
basin.
Water
Quality
Index
(WQI)
significantly
better
non-flood
season
compared
flood
season,
with
deteriorating
towards
lower
reaches.
Key
affecting
include
dissolved
oxygen
(DO),
ammonia
nitrogen
(NH3-N),
total
phosphorus
(TP),
turbidity
(Tur)
NH3-N,
permanganate
index
(CODMn),
electrical
conductivity
(EC)
season.
(2)
Cultivated
construction
are
main
uses
sub-basin
was
identified
scale
for
River.
(3)
(PLSR)
analysis
revealed
that
cultivated
land,
grass
primary
types
influencing
changes,
PLSR
model
during
lands
show
positive
correlation
indicators,
while
forest
bodies,
grasslands
correlate
positively
DO
negatively
other
indicators.
underscores
rational
planning
crucial
enhancing
Ecological Indicators,
Journal Year:
2024,
Volume and Issue:
161, P. 111998 - 111998
Published: April 1, 2024
In
multi-dam
river
systems,
human
disturbances
can
significantly
disrupt
connectivity,
fragment
habitats,
and
harm
aquatic
ecosystems.
Aiming
at
the
comprehensive
assessment
of
spatial
distribution
water
ecological
health,
as
well
investigation
impacts
activities
on
Shaying
River
in
China
between
2011
2015
was
taken
a
case
study.
Data
environment,
ecology,
habitat
quality
were
collected
by
field
investigations
then
investigated
correlation
analysis
principal
component
analysis.
The
SMI-P
method
adopted
to
estimate
health
condition.
It
found
that
oxygen-consuming
organic
pollutants
nutrient
salts
predominantly
concentrated
midstream
downstream
sections,
leading
severe
pollution
degraded
biodiversity.
All
monitored
sections
classified
sub-healthy
state
or
worse,
while
Huaidian
section
exhibited
poorest
conditions,
with
100%
ratings
falling
into
medium
sub-morbid
categories.
concluded
dam
regulation,
tributary
quality,
seasonal
drivers
like
fertilizer
use
flow
discharge,
primary
factors
affecting
variability
health.
Furthermore,
this
paper
has
proposed
well-suited
framework
for
dam-controlled
rivers.
This
be
widely
applied
similar
providing
valuable
insights
effective
management
conservation
efforts.
Ecological Indicators,
Journal Year:
2023,
Volume and Issue:
154, P. 110859 - 110859
Published: Aug. 25, 2023
With
rapid
economic
and
social
development,
human
activities,
such
as
the
construction
of
reservoirs,
have
satisfied
many
needs.
However,
these
activities
also
caused
changes
in
hydrological
ecosystem
basin,
impacting
river
biodiversity.
The
establishment
Shanxi
Reservoir
within
Feiyun
River
Basin
has
inevitably
altered
system,
which
was
previously
shaped
primarily
by
precipitation.
This
study
comprehensively
evaluates
impact
on
alteration
basin.
Two
ecological
flow
indicators,
ecosurplus
ecodeficit,
were
used
based
duration
curves,
along
with
Shannon
Index
biodiversity
(SI)
several
indicators:
Indicator
Hydrological
Alteration
(IHA),
Degree
Integrated
(D0),
Dundee
Regime
Method
(DHRAM).
results
show
that:
(1)
observed
correlation
between
precipitation
disrupted
following
reservoir.
As
a
result,
there
notable
deficit
spring
season,
maximum
0.43,
considerable
increase
surplus
during
winter,
reaching
4.80.
(2)
regime
undergone
significant
changes,
resulting
combined
variability
66.
44%
an
hazard
level
4.
indicates
high
risk
to
river’s
environment.
(3)
total
seasonal
increased
remained
consistently
high,
contributed
decline
SI
biodiversity,
river's
biology
degraded
over
time
(4)
use
indicators
is
closely
tied
IHA32
indicators.
Combining
ERHIs
shown
be
successful
approach
for
assessing
ecohydrological
regimes.
These
findings
implications
future
studies
similar
cases
offer
valuable
guidance
managing
water
resources.
Water,
Journal Year:
2024,
Volume and Issue:
16(12), P. 1669 - 1669
Published: June 12, 2024
The
establishment
and
operation
of
cascade
reservoirs
in
the
mainstream
upper
middle
reaches
Yangtze
River
have
changed
river’s
thermal
regimes.
This
study
analyzed
correlation
between
water
temperature
its
influencing
factors
employed
various
evaluation
indexes—including
∆T
(the
temperature-increasing
index,
°C/100
km),
IEC
extreme
fluctuation
index),
IBD
baseline
deviation
IPO
phase
offset
time
index).
aim
was
to
uncover
variation
characteristics
quantify
impact
reservoir
construction
on
annual
seasonal
rhythms.
Our
findings
show
that
weaken
synchronization
air
downstream.
lower
Jinsha
led
obvious
homogenization,
deviation,
lagging
effects
downstream,
which
intensified
with
increase
storage
capacity.
These
were
more
pronounced
colder
months
compared
warmer
months.
Additionally,
influence
tributaries
water–air
heat
exchange
these
is
alleviated
different
degrees.
results
are
significant
for
assessing
river
ecological
health
context
hydropower
development.
River Research and Applications,
Journal Year:
2024,
Volume and Issue:
40(8), P. 1527 - 1540
Published: June 18, 2024
Abstract
Reducing
river
flows
significantly
affects
livelihoods,
ecology
and
industrial
production.
Therefore,
allowing
for
ecological
flow
requirements
has
been
applied
to
limiting
human
water
consumption
is
incorporated
into
allocation
planning.
However,
the
unavailability
of
data
greatly
limits
e‐flow
studies
this
lack
sufficient
ecosystem
mostly
addressed
by
using
hydrological
metrics
as
surrogates
ecosystem.
This
study
employed
nine
indicators
‘Flow
Health’
model
assess
health
explore
optimal
regimes.
The
modelling
estimated
required
extra
flood
conservation
under
default
custom
thresholds.
Ecological
were
calculated
five
stations
Weihe
River
through
coupling
with
three
methodologies.
index
deviation
indicated
that
regimes
in
have
partially
changed
from
reference
period.
Fish
other
aquatic
habitats
reduced
flows,
but
floodplain
not
seriously
affected.
results
showed
restoration
concentrated
July
September.
dry
seasons
methods
less
than
average
current
flow,
which
reasonable.
provides
ideas
on
how
environmental
assessments
are
undertaken
similar
regions.
Ecological Indicators,
Journal Year:
2024,
Volume and Issue:
166, P. 112487 - 112487
Published: Aug. 13, 2024
Previous
research
rarely
identified
the
synergistic
effects
of
climate
change
and
human
activities
on
hydrological
regimes,
thus
leading
to
an
incomplete
attribution
regime
changes.
To
address
this
issue,
paper
presents
a
complete
approach
for
accurately
quantifying
these
impacts.
The
framework
integrates
various
methodologies,
including
runoff
abrupt
point
judgment
method
distinguishing
pre-
post-impact
periods,
Soil
Water
Assessment
Tool
(SWAT)
is
used
isolate
processes
influenced
solely
by
change,
linear
separation
identifying
affected
activities,
Indicator
Hydrologic
Alteration
(IHA)
changes
in
regimes.
Application
Ganjiang
River
Basin
(GRB)
unveils
significant
alterations
This
has
resulted
decline
aquatic
organism
species
compared
prior-impact
period
levels.
Notably,
exert
opposing
minimum
flow
indicators
pulse
GRB.
Moreover,
factors
exhibit
substantial
effect
numerous
indicators,
resulting
regimes
combined
being
considerably
different
with
cumulative
impact
those
activities.
Consequently,
future
water
management,
it
crucial
recognize
positive
role
prudent
mitigating
adverse
impacts
change.
Hydrology Research,
Journal Year:
2023,
Volume and Issue:
55(1), P. 33 - 50
Published: Dec. 22, 2023
Abstract
A
thorough
understanding
of
the
ecological
impacts
behind
hydrologic
alteration
is
still
insufficient
and
hinders
watershed
management.
Here,
we
used
eco-flow
indicators,
multiple
hydrological
fluvial
biodiversity
to
investigate
flow
in
different
temporal
scales.
The
case
study
Han
River
shows
a
decrease
high
flows
contributed
eco-surplus
increase
eco-deficit
summer
autumn,
while
can
be
attributed
change
low
spring.
An
integrated
was
over
48%
degree
under
moderate
risk
impact
period
I,
DHRAM
scores
showed
Huangzhuang
station
faced
II.
(increase)
total
seasonal
(eco-deficit)
identified
after
with
indicators
contributions.
Shannon
index
decreasing
trend,
indicating
degradation
basin.
Eco-flow
such
as
are
strong
relationships
32
accepted
for
ecohydrological
alterations
at
This
deepens
responses
alteration,
which
may
provide
references
water
resources
management
security
maintenance.
