With
the
increase
of
operation
cycle
in
long-distance
water
conveyance
project,
problem
silt
or
algae
residue
deposition
river
channels
is
becoming
more
and
prominent,
especially
vicinity
some
uncommonly
used
bifurcation
outflow
gates
along
project.
When
reaches
certain
thickness,
it
will
not
only
affect
quality
local
bodies,
but
also
seriously
normal
these
gates.
In
order
to
alleviate
this
problem,
prevention
control
project
mainly
explored
from
two
perspectives:
(1)
scouring
effect
on
bottom
side
channel
compared
by
studying
different
diversion
ratios
channel;
(2)
The
arc
guide
wing
wall
built
near
junction
main
channel.
simulation
conducted
at
6
included
angles
including
-10°,
-5°,
0°,
5°,
10°
15°,
for
non-guide
wall.
incoming
flow
simulated
280
m3/s
general
320
design
flow.
A
total
14
groups
experiments
are
carried
out
numerical
simulation.
It
can
be
concluded
that,
when
held
constant,
a
higher
ratio
results
effective
sediment
0°
has
significant
junction;
cannot
play
role
hinders
Environmental Research Letters,
Год журнала:
2023,
Номер
18(6), С. 063004 - 063004
Опубликована: Апрель 26, 2023
Abstract
Eutrophication
is
a
major
global
concern
in
lakes,
caused
by
excessive
nutrient
loadings
(nitrogen
and
phosphorus)
from
human
activities
likely
exacerbated
climate
change.
Present
use
of
indicators
to
monitor
assess
lake
eutrophication
restricted
water
quality
constituents
(e.g.
total
phosphorus,
nitrogen)
does
not
necessarily
represent
environmental
changes
the
anthropogenic
influences
within
lake’s
drainage
basin.
Nutrients
interact
multiple
ways
with
climate,
basin
conditions
socio-economic
development,
point-source,
diffuse
source
pollutants),
systems.
It
therefore
essential
account
for
complex
feedback
mechanisms
non-linear
interactions
that
exist
between
nutrients
ecosystems
assessments.
However,
lack
set
holistic
understanding
challenges
such
assessments,
addition
limited
monitoring
data
available.
In
this
review,
we
synthesize
main
freshwater
basins
only
include
but
also
sources,
biogeochemical
pathways
responses
emissions.
We
develop
new
causal
network
(i.e.
links
indicators)
using
DPSIR
(drivers-pressure-state-impact-response)
framework
highlights
interrelationships
among
provides
perspective
dynamics
basins.
further
review
30
key
drivers
pressures
seven
cross-cutting
themes:
(i)
hydro-climatology,
(ii)
socio-economy,
(iii)
land
use,
(iv)
characteristics,
(v)
crop
farming
livestock,
(vi)
hydrology
management,
(vii)
fishing
aquaculture.
This
study
indicates
need
more
comprehensive
systems,
guide
expansion
networks,
support
integrated
assessments
manage
eutrophication.
Finally,
proposed
can
be
used
managers
decision-makers
realistic
targets
sustainable
management
achieve
clean
all,
line
Sustainable
Development
Goal
6.
Environments,
Год журнала:
2025,
Номер
12(3), С. 96 - 96
Опубликована: Март 18, 2025
The
interaction
between
antibiotics
and
antibiotic
resistance
genes
(ARGs)
in
freshwater
ecosystems
has
become
a
critical
environmental
concern.
This
study
investigates
seasonal
variations
of
sulfonamide
tetracycline
their
relationship
with
ARGs
three
urban
reservoirs
Nanjing,
China:
Pingshan
Forest
Park,
Shanhu
Lake
Wetland
Zhaoqiao
Reservoir.
Sampling
was
conducted
May
September
2023
to
assess
water
quality,
concentrations,
ARG
abundance.
A
total
30
samples
were
analyzed
regard
physicochemical
parameters,
heavy
metals,
antibiotics.
quantitative
PCR
assay
used
measure
the
abundance
relative
16S
rRNA
gene.
Sulfonamide
concentrations
ranged
from
120
ng/L,
while
tetracyclines
50–160
ng/L.
Notably,
sulfamethazine
decreased
significantly
two
(Shanhu
Zhaoqiao,
p
<
0.05),
other
showed
minimal
variation,
indicating
persistent
contamination
agricultural
runoff
wastewater
discharge.
lower
than
September,
being
cumulatively
genes.
Strong
correlations
(r
>
0.7)
observed
parameters
like
dissolved
oxygen
pH.
High
levels
areas
without
nearby
hospitals
or
pharmaceutical
companies,
implicating
agriculture
as
major
pollution
source.
By
analyzing
across
eutrophic
China,
we
highlight
drivers
proliferation
propose
targeted
mitigation
strategies.
ACS ES&T Water,
Год журнала:
2024,
Номер
4(7), С. 2995 - 3006
Опубликована: Июнь 24, 2024
The
total
nitrogen/total
phosphorus
(TN/TP)
ratio
is
considered
a
valuable
indicator
for
evaluating
the
abundance
of
phytoplankton
and
eutrophic
condition
water
body,
but
its
effectiveness
as
an
eutrophication
at
different
watershed
scales
has
not
been
fully
explored.
In
this
study,
we
collected
data
from
103
lakes
within
four
major
watersheds
in
China
utilized
machine
learning
models
eXtreme
Gradient
Boosting
(XGBoost)
k-nearest
neighbors
(KNN)
to
predict
TN/TP
three
scales.
We
identified
notable
disparities
ratio,
chlorophyll
concentration,
algal
cell
density
across
By
incorporating
time
input
variable,
were
able
capture
temporal
trends
which
enhanced
predictive
accuracy
fit
models.
optimization
ratios
model
indicators'
coefficient
determination,
root-mean-square
error,
mean
absolute
percentage
error
are
35.71
±
25.26%,
0.43
0.17%,
1.47
1.19%,
respectively.
XGBoost
demonstrated
higher
better
than
KNN.
Our
results
reveal
substantial
impact
scale
on
predicting
eutrophication-limiting
nutrients
bodies.
