Journal of Hydrology Regional Studies,
Год журнала:
2023,
Номер
51, С. 101606 - 101606
Опубликована: Дек. 12, 2023
Jupiá
Hydropower
Station,
the
junction
of
São
Paulo
and
Mato
Grosso,
Brazil.
During
flood
season,
a
large
amount
aquatic
vegetation
is
brought
to
front
dam,
which
not
only
threatens
safety
project
but
also
causes
internal
pollution
in
reservoir.
This
study
combined
field
data
with
remote
sensing
technology
analyze
temporal
spatial
succession
Reservoir.
The
biomass
inversion
models
were
established
estimate
whole
reservoir
area.
(1)
area
rainy
season
could
reach
twice
that
dry
season.
From
2018–2022,
total
showed
an
overall
trend
increase.
(2)
floating
submerged
fluctuated
little
from
2018
2022,
annual
average
32.14
×
104
t,
accounts
for
23.5%
biomass.
Submerged
was
important
object
management
this
Water Resources Research,
Год журнала:
2024,
Номер
60(1)
Опубликована: Янв. 1, 2024
Abstract
Benthic
oxygen
flux
with
complex
spatiotemporal
variations
is
essential
for
the
global
budget
of
carbon
dioxide
and
regional
security
water
quality
ecology,
but
its
dominant
driver
under
different
circumstances
has
yet
to
be
identified.
In
this
study,
a
parametric
scheme
was
proposed
validated
aquatic
eddy
correlation
measurements
then
coupled
diagenesis
model
environment
model.
The
applied
river‐reservoir
significant
environmental
gradients
in
hydrodynamics,
diagenesis,
hypoxia,
which
are
three
factors
that
competitively
drive
variation
benthic
flux.
results
indicate
hydrodynamics
dominate
riverine
thalweg
areas,
lacustrine
bank
hypoxia
shows
dominance
only
hypolimnetic
anoxic
area.
general,
river‐reservoirs,
followed
by
both
more
prominent
than
hypoxia.
If
operated
reservoir
experiences
wet
year,
tends
increase,
while
decreases.
divers
exhibit
similar
stable
systems
reservoirs,
becomes
exclusive
fluxes
systems.
Water Resources Research,
Год журнала:
2024,
Номер
60(7)
Опубликована: Июль 1, 2024
Abstract
Investigations
of
water
flow
movements
affected
by
vegetation
is
a
research
hotspot
in
ecological
restoration.
The
theory
and
equations
the
velocity
distribution
under
influence
rigid
are
relatively
mature.
This
study
proposes
new
drag
force
equation
that
varies
with
bending
angle
analytical
solution
profile.
Comparisons
between
model
calculation
experimental
data,
results
showed
this
proposed
produced
accurate
simulations
for
through
flexible
various
deflections.
In
addition,
was
verified
to
be
applicable
without
angle.
Moreover,
features
parameters
adopted
discussed,
empirical
these
presented.
further
improves
field
environmental
fluid
mechanics
can
serve
as
theoretical
underpinning
restoration
river
courses.
Journal of Hydrology Regional Studies,
Год журнала:
2024,
Номер
53, С. 101832 - 101832
Опубликована: Май 22, 2024
The
Baiyangdian
Lake,
Xiong'an
New
Area
of
Hebei
Province,
China.
construction
water
transfer
projects
provides
feasible
measures
for
lake
space
and
ecology
restoration,
with
a
critical
issue
in
this
practice
being
how
to
efficiently
utilize
multiple
sources
replenishments
improve
the
quality
water-receiving
lakes.
This
study
developed
hydrodynamic
model
which
receives
from
upstream
reservoirs
within
its
basin
two
other
basins.
Simulation
scenarios
varied
proportions
receiving
these
were
set
up
model,
optimal
replenishment
scheme
best
improvement
was
determined.
multi-source
can
effectively
enhance
environment
lakes,
transported
basins
has
more
positive
effect
than
that
released
local
basin;
additionally,
found
be
improved
during
non-flood
seasons
compared
flood
seasons.
Under
preferred
scheme,
average
concentrations
ammonia,
total
nitrogen,
phosphorus
core
areas
all
decreased
by
10%.
However,
may
induce
divergence
indicators
aquatic
system
evolutions
making
fragmented.
proposes
further
exploit
benefits
while
mitigating
potential
risks
enhancing
hydrological
connectivity
integrating
monitoring
mathematical
modeling.
Sediment
movements
on
the
riverbeds
are
crucial
in
fluvial
processes.
Therefore,
studying
incipient
sediment
motion
is
valuable
for
predicting
changes
behavior.
In
this
study,
influence
of
aquatic
vegetation
introduced
into
momentum
balance
equation
under
condition
a
bare
bed.
The
presented
model
open
channels
covered
by
derived,
consideration
density
and
relative
submergence.
This
study
simplifies
format.
its
coefficients
demonstrate
good
applicability
to
various
working
conditions
without
requiring
numerous
changes.
predicted
velocity
determined
proposed
validated
against
experimental
data.
Results
show
excellent
agreement
between
two
scenarios,
including
combinations
rigid
or
flexible
submerged
emergent
states.
Additionally,
observed
decrease
with
increasing
density.
However,
further
increase
may
amplify
resistance,
hindering
motion.
Meanwhile,
movement
becomes
challenging
as
water
depth
increases,
assuming
that
flow
discharge
remain
constant.
Journal of the American Society for Mass Spectrometry,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 17, 2024
The
exchange
and
transformation
of
dissolved
organic
matter
(DOM)
at
the
sediment-water
interface
are
crucial
factors
in
regulating
watershed
biogeochemistry,
with
molecular
composition
DOM
serving
as
a
pivotal
determinant
elucidating
this
process.
High-resolution
mass
spectrometry
(HRMS)
is
an
effective
tool
for
resolving
DOM.
By
analyzing
compositional
characteristics
under
three
different
salinities
same
latitude
region
northern
China,
findings
indicate
certain
variations
component
between
low-salinity
inland
waters
high-salinity
seawaters,
former
exhibiting
greater
diversity
higher
weights,
whereas
latter
displayed
saturation
bioavailability.
Notably,
presence
more
CHOS
substances
underscores
influenced
by
terrestrial
inputs
anthropogenic
activities.
Conversely,
CHO
CHNO
seawater
microbial
effects.
chemical
process
from
overlying
water
to
pore
sediments
was
characterized
methylation,
hydrogenation,
decarboxylation,
reduction,
determined
calculating
relations
H/C
O/C
ratios
compound
types.
These
that
HRMS
can
yield
refined
results
revealing
environments,
which
provides
reliable
basis
deeper
understanding
source-sink
mechanism
sediment
matter.
