Frontiers in Marine Science,
Год журнала:
2023,
Номер
10
Опубликована: Авг. 10, 2023
Climate
change
and
intensive
anthropogenic
activities
have
severely
challenged
the
water
quality
of
China’s
Pearl
River
Estuary
(PRE).
Further
investigations
into
long-term
variation
associated
driving
mechanisms
are
therefore
necessary
to
support
sustainable
development
PRE’s
Greater
Bay
Area
(GBA).
This
study
used
remote
sensing
retrieval
address
spatiotemporal
chlorophyll-
a
(Chl-
)
characteristics
in
PRE
relationship
between
Chl
-a
concentrations
socioeconomic/environmental
indicators.
Three
decades
Landsat
satellite
images
measured
data
were
collected,
two-band
global
algorithm
was
retrieve
Chl-
concentration
data.
Results
reveal
significant
variability
concentrations.
The
space-averaged
exhibited
slight
downward
trend
during
past
three
decades,
multi-year
mean
value
5.20
mg/L.
Changes
environmental
protection
policies
recent
years
improved
overall
quality.
western
section
had
highest
(i.e.,
5.92
mg/L
average)
while
eastern
lowest
3.98
average).
discrepancy
likely
caused
by
section’s
more
industrial
activities,
resulting
higher
wastewater
discharge
volume.
Affected
climatic
conditions,
winter
evenly
distributed
summer
significantly
higher.
Additionally,
positively
correlated
with
total
phosphorus
(TP),
nitrogen
(TN),
ammonia
(NH
3
-N),
biotic
oxygen
demand
(BOD
5
).
also
external
factors
climate
activities).
Among
these
factors,
proportion
primary
industries
coastal
cities
is
intended
help
direct
improvement
management
urban
GBA.
JAWRA Journal of the American Water Resources Association,
Год журнала:
2025,
Номер
61(2)
Опубликована: Март 24, 2025
ABSTRACT
Urbanization,
driven
by
population
growth,
alters
watershed
hydrology
and
nutrient
runoff.
However,
the
complex
interplay
between
urbanization
nutrients
in
regional
watersheds
remains
an
open
question.
This
study
assessed
how
affects
streamflow,
total
nitrogen
(TN),
phosphorus
(TP)
loads
six
diverse
Florida
covering
area
of
10,600
km
2
.
was
carried
out
introducing
2070
land
use/land
cover
(LULC)
projections
to
a
hydrology/water
quality
model.
We
investigated
different
levels
urban
density,
as
proxy
for
patterns,
affect
streamflow
variability.
Results
indicate
that
could
increase
from
14%
27%
2070.
expansion
lead
monthly
increases
0%–36%,
based
on
patterns.
Future
TP
change
−8%
+140%,
with
decreases
attributed
LULC
transitions
high‐use
fertilizer
agriculture
low/medium
density
residential
classes.
Projected
TN
are
more
consistent,
simulated
changes
−1%
+26%.
Among
transitions,
largest
caused
potential
freshwater
wetlands.
provides
knowledge
relevant
regions
undergoing
similar
trends,
enabling
managers
make
better
development
plans
water
considerations.
It
also
contributes
detailed
modeling
framework
can
be
adopted
even
use
datasets
software.
Frontiers in Environmental Science,
Год журнала:
2024,
Номер
12
Опубликована: Фев. 21, 2024
Best
management
practices
(BMPs)
are
widely
applied
to
address
water
quality
degradation
issues
attributed
non-point
source
pollutants.
The
objective
of
this
study
was
assess
the
efficiency
two
types
BMPs,
vegetation
filter
strips
(VFS)
and
wetlands,
in
reducing
total
nitrogen
(TN)
phosphorus
(TP)
a
watershed,
investigate
whether
BMPs
is
maintained
under
future
climate
scenarios
by
employing
Soil
Water
Assessment
Tool
(SWAT).
A
set
parameters
calibrated
using
SWAT
Calibration
Uncertainty
Program
(SWAT-CUP)
ensure
acceptable
simulation
results.
Three
BMP
were
developed
applying
VFS
wetlands
individually
combination.
Projected
data
from
18
global
circulation
models
Shared
Socioeconomic
Pathways
(SSP1-2.6,
SSP2-4.5,
SSP3-7.0,
SSP5-8.5)
used
depict
change
conditions.
demonstrated
18.2%
22.9%
greater
reduction
for
TN
TP,
respectively,
relative
wetlands.
When
simultaneously
applied,
even
than
that
single-BMP
implementation
(by
7.4%
6.8%
TP
compared
alone
25.5%
29.7%
alone).
To
effect
change,
model
simulated
results
period
2021–2,100.
differences
between
combined
scenario
individual
increased
with
intensity
especially
distant
future.
Therefore,
supports
effectiveness
nutrient
pollution
control
multiple
rather
BMPs.
Furthermore,
research
underscores
adaptability
reliability
natural-based
solutions
mitigating
changing
climate,
which
essential
effective
ecological
restoration
complex
urban-agricultural
landscapes.
provides
valuable
insights
watershed
managers
policymakers
seeking
strategies
combat
face
within
unique
landscape
South
Korea.
