Cesium-137 Distribution Patterns in Bottom Sediments of Beaver Ponds in Small Rivers in the North of the Volga Upland, European Russia
Water,
Journal Year:
2025,
Volume and Issue:
17(4), P. 503 - 503
Published: Feb. 11, 2025
This
paper
presents
the
results
of
analysis
redistribution
cesium-137
(137Cs)
in
bottom
sediments
beaver
ponds
two
small
rivers
forest-steppe
north
Volga
Upland,
which
is
one
most
contaminated
areas
Middle
region
(European
Russia)
with
artificial
radionuclides.
study
based
on
fieldwork
materials,
laboratory
analyses
specific
radioactivity
137Cs
soil
and
sediment
samples,
their
granulometric
composition,
content
organic
matter
them.
The
obtained
indicate
a
significant
decrease
activity
direction
from
near-water-divide
surface
soils
(on
average,
54
Bq/kg)
to
studied
no
more
than
6
Bq/kg).
A
weak
(statistically
insignificant)
tendency
towards
downstream
was
also
revealed.
With
this
detected
trend,
statistically
relationship
found
between
changes
composition
sediments.
However,
relatively
good
identified
total
matter.
stage-by-stage
accumulation
thickness
revealed,
highest
concentration
layer
finely
dispersed
fractions
that
for
correct
quantitative
assessment
migration
pollutants
(including
radioactive
ones)
floodplain-channel
systems,
it
necessary
consider
structures
(primarily
ponds),
act
as
zones
intensive
accumulation.
Language: Английский
The Impacts of Beaver Dams on Groundwater Regime and Habitat 6510
Land,
Journal Year:
2024,
Volume and Issue:
13(11), P. 1902 - 1902
Published: Nov. 13, 2024
Changes
in
land
usage,
increasing
climatic
uncertainty,
and
dynamic
development
of
the
rate
natural
population
growth
Eurasian
beaver
will
lead
to
benefits
disadvantages
from
activity.
During
three
growing
seasons
2020
2022,
four
cross-sections
were
marked
on
unused
sub-irrigation
systems
with
periodic
occurrence
dams,
located
organic
soils
parts
facility
protected
by
Habitats
Directive
(natural
habitat
6510)
Central
Poland.
Periodic
water
table
measurements
wells,
beds
adjacent
ditches,
riverbed
carried
out.
Identification
states
structures
plant
communities
was
done
using
botanical-weight
analysis
several
samples
an
area
1
m2.
Beaver
dams
increased
levels
river,
groundwater
depth
over
78%
events
2020–2022
years.
A
large
impact
precipitation
hydraulic
conditions
meadow
observed.
In
studied
area,
since
a
moderately
moist
(6510)
is
within
Natura
2000
network,
phenomena
soil
moisture,
absence
mowing
meadows
expansive
herbaceous
vegetation
that
tolerates
may
disappearance
these
habitats,
especially
zone
near
riverbed.
Language: Английский
Water Discharge Change in the Rivers of the South of the Boreal Forest Zone of Eastern European Russia at the End of the Late Holocene and in the Anthropocene: The Vyatka River
Hydrology,
Journal Year:
2024,
Volume and Issue:
11(12), P. 210 - 210
Published: Dec. 4, 2024
Based
on
long-term
observations
of
the
water
discharge
(WD)
from
1878
to
2018,
main
trends
and
patterns
its
change
in
basin
one
largest
rivers
east
East
European
Plain,
Vyatka
River,
were
revealed
using
a
set
standard
statistical
procedures
graphical
analysis
WD
probability
curves.
Three
phases
annual
river
identified,
corresponding
periods
1878–1929,
1930–1977,
1978–2018.
The
first
third
characterized
by
increased
(by
22–23%)
relative
medium
period,
differences
average
characteristics
between
these
statistically
significant.
It
is
also
noteworthy
that
difference
last
was
very
small
insignificant.
A
gradual
increase
share
so-called
normal
decrease
abnormal
(including
extreme)
noted
1878–1929
1978–2018
predominantly
northern
half
basin.
At
same
time,
southern
basin,
according
only
1930–1977
1978–2018,
remained
almost
unchanged;
slight
positive
anomalies
noted.
Increased
intra-annual
variability
characteristic
period
reduced
value.
Between
three
identified
periods,
reduction
runoff
coefficient
observed
during
warm
(mainly
summer)
season
River
specified
chiefly
due
changes
climatic
factors,
primarily
ratio
air
temperature
precipitation,
expressed
as
De
Martonne
aridity
index.
duration
principal
cycle
82
years.
An
additional
contribution
could
have
been
made
widespread
cropland
study
region
recent
decades.
obtained
results
can
be
preliminarily
considered
representative
entire
sector
boreal
forest
zone
(taiga
zone)
Plain.
Language: Английский