Research of Runoff and Sediment Yields on Different Slopes of Lancang River Arid Valley Under Natural Rainfall Conditions
Baoyang Sun,
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Jigen Liu,
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Jiangang Ma
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et al.
Water,
Journal Year:
2025,
Volume and Issue:
17(7), P. 997 - 997
Published: March 28, 2025
Limited
by
water
and
heat
conditions,
the
southwest
alpine
valley
area
has
a
dry
climate,
complex
terrain,
low
vegetation
coverage,
very
fragile
ecological
environment.
The
runoff
plots
of
different
slope
gradients
(10°,
15°,
20°),
lengths
(2,
5,
10
m)
reverse
terrace
(RST)
in
Lancang
River
arid
were
taken
as
objects.
Through
situ
observation
sediment
yield
six
natural
erosive
rainfalls,
contribution
rate
factors
was
quantified,
effect
mechanism
revealed.
main
results
follows:
(1)
Sediment
yields
rainfalls
closely
correlated
with
rainfall
type
duration.
Under
conditions
heavy
rain
(rain
II
III),
there
critical
gradient,
maximum
achieved
when
gradient
15°.
(2)
reduction
benefits
horizontal
terraces
24.88%
46.25%,
these
increased
1.47
times
1.30
after
setting
RST,
significantly
increase
number
RSTs
(p
<
0.05).
(3)
In
this
study,
intensity
contributed
most
to
(34.5%),
followed
length
(15.1%)
(7.2%).
Slope
length,
intensity,
order
25.9%,
18.0%,
11.4%
rate,
respectively.
(4)
There
significant
linear
correlation
between
on
slopes
decreased
RST
(2.91
times),
it
numbers.
This
study
can
provide
scientific
basis
reference
for
prevention
control
soil
loss
restoration
canyon
area.
Language: Английский
Assessment of Erosive Rainfall and Its Spatial and Temporal Distribution Characteristics: Case Study of Henan Province, Central China
Water,
Journal Year:
2024,
Volume and Issue:
17(1), P. 62 - 62
Published: Dec. 29, 2024
Erosive
rainfall
is
essential
for
initiating
surface
runoff
and
soil
erosion
to
occur.
The
analysis
on
its
temporal
spatial
distribution
characteristics
crucial
calculating
erosivity,
predicting
erosion,
implementing
water
conservation.
This
study
utilized
daily
observation
data
from
90
meteorological
stations
in
Henan
1981
2020,
conducted
geostatistical
analysis,
M-K
mutation
test
wavelet
erosive
reveal
the
spatiotemporal
over
past
40
years.
Building
this
foundation,
correlation
between
rainfall,
erosivity
were
further
explored.
findings
indicated
that
average
annual
Province
varied
217.66
mm
812.78
mm,
with
an
yearly
of
549.24
a
standard
deviation
108.32
mm.
constitutes
77%
average,
found
highly
correlated
volume.
increased
northwest
southeast,
had
same
as
total
rainfall.
number
days
was
20.5
sub-erosive
26.86
ranged
1341.81
6706.64
MJ·mm·ha−1·h−1,
averaging
at
3264.63
MJ·mm·ha−1·h−1.
Both
are
influenced
by
monsoon,
showing
unimodal
trend,
majority
attributed
June
September,
amounting
80%.
results
can
provide
basis
forecasting
heavy
events,
conservation
planning,
ecological
treatment,
restoration.
Language: Английский