The
Negombo
lagoon
is
a
coastal
situated
on
the
west
coast
of
Sri
Lanka.
influenced
by
local
communities
that
introduce
waste
into
its
ecosystem.
Seven
entry
points
were
assessed
for
ecological
health.
Physicochemical
and
microbiological
parameters
measured
in
triplicate
at
each
sampling
location
(n=84).
Microbiological
also
30
oyster
samples
(total
length,
TL
>
6
cm,
n=30).
Regional
coliform
contamination
variation
was
analyzed
using
one-way
ANOVA
analysis.
Overall
water
quality
categorized
from
good
to
poor
conditions.
Results
showed
northern
section
exceeded
recommended
thresholds
swimming
(TCC
<
126
MPN)
seafood
consumption
100
MPN/g),
indicating
presence
Escherichia
coli.
Water
indices
suggested
fecal
pollution,
except
south.
Additionally,
survey
found
high
(76.7%).
study
concludes
oysters
pose
health
risks.
Oceanologia,
Journal Year:
2023,
Volume and Issue:
66(1), P. 9 - 25
Published: June 22, 2023
In
this
study,
we
report
the
environmental
impact
of
water
exchange
blocking
by
a
3
km
road
dam
built
in
1896
shallow
Väike
Strait,
north-eastern
Baltic
Sea.
Using
multidisciplinary
measurement
campaign
and
numerical
simulations,
show
ecological
conditions
strait
have
considerably
altered;
previously
free-flowing
now
comprises
two
bays
with
separate
circulation
systems.
Water
area
close
to
has
decreased
10–12-fold.
Since
advection
is
weakened,
atmosphere
sediments
relatively
greater
role
shaping
characteristics.
Consequently,
occasional
very
high
sea
surface
temperature,
salinity,
total
nitrogen,
strong
diurnal
cycles
temperature
(>4°C)
dissolved
oxygen
(>4
mg
l−1)
were
observed
near
summer.
Oxygen
levels
are
continuously
below
saturation
winter
concentration
occasionally
drops
hypoxic
ice
cover.
Nitrogen
content
3–4
times
higher
than
neighboring
areas.
The
also
modifies
level,
wind
wave
suspended
matter
patterns
strait.
Sediments
elevated
hazardous
substances
likely
associated
traffic
on
road.
phytobenthos
community
dominated
annual
green
algae,
which
massively
decompose
during
winter.
impedes
fish
migration
between
suitable
feeding
spawning
areas,
there
been
kills
caused
rapid
fluctuations
levels,
amplified
dam.
construction
new
openings
would
alleviate
negative
impacts
The
Negombo
lagoon
is
a
coastal
situated
on
the
west
coast
of
Sri
Lanka.
influenced
by
local
communities
that
introduce
waste
into
its
ecosystem.
Seven
entry
points
were
assessed
for
ecological
health.
Physicochemical
and
microbiological
parameters
measured
in
triplicate
at
each
sampling
location
(n=84).
Microbiological
also
30
oyster
samples
(total
length,
TL
>
6
cm,
n=30).
Regional
coliform
contamination
variation
was
analyzed
using
one-way
ANOVA
analysis.
Overall
water
quality
categorized
from
good
to
poor
conditions.
Results
showed
northern
section
exceeded
recommended
thresholds
swimming
(TCC
<
126
MPN)
seafood
consumption
100
MPN/g),
indicating
presence
Escherichia
coli.
Water
indices
suggested
fecal
pollution,
except
south.
Additionally,
survey
found
high
(76.7%).
study
concludes
oysters
pose
health
risks.
