Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: June 8, 2023
Compared
to
earthquakes
and
volcanoes,
drought
is
one
of
the
most
damaging
natural
disasters
mainly
affected
by
rainfall
losses,
especially
runoff
regulation
ability
underlying
watershed
surface.
Based
on
monthly
data
recorded
from
1980
2020,
in
this
study,
distributed
lag
regression
model
used
simulate
rainfall-runoff
process
karst
distribution
region
South
China,
a
time
series
lagged-flow
volumes
calculated.
The
lagged
effect
analyzed
four
models,
joint
probability
between
intensity
frequency
simulated
copula
function
family.
results
show
that
(1)
effects
normal,
log-normal,
P-III
log-logistic
models
drainage
basin
are
particularly
significant,
with
small
mean
square
errors
(MSEs)
significant
time-scale
characteristics.
(2)
Affected
spatiotemporal
differences
impacts
different
media
structures,
response
differs
significantly
among
scales.
Especially
at
1-,
3-
12-month
scales,
coefficient
variation
(Cv)
greater
than
1,
while
it
less
1
6-
9-month
(3)
frequencies
relatively
high
(with
medium,
medium-high
frequencies,
respectively),
normal
low
(medium-low
frequencies).
(4)
There
negative
correlation
(R
<
-
0.8,
Sig.
0.01)
frequency.
For
simulation,
fitting
gumbel
Copula
best,
followed
Clayton
Frank-1
copulas,
Frank-2
weak.
Consequently,
propagation
mechanism
meteorological
agricultural
or
hydrological
conversion
effectively
revealed
thereby
providing
scientific
basis
for
rational
utilization
water
resources
resistance
disaster
relief
areas.
European Journal of Soil Science,
Journal Year:
2022,
Volume and Issue:
73(4)
Published: July 1, 2022
Abstract
Knowledge
of
water
movement
from
the
hillslope
critical
zone
is
important
for
management.
However,
runoff
process
resulting
extreme
rainfall
events
remains
unclear
due
to
rare
field‐based
natural
monitoring
data.
We
investigated
rainwater
infiltration
and
generation
processes
in
two
plots
with
deep
relatively
shallow
soil
thicknesses
(66
vs.
35
cm
depth
on
average,
respectively)
karst
hillslopes.
Rainwater,
lateral
discharge
soil‐epikarst
system
were
monitored
using
hydrometric
18
O
isotope
methods
September
2020,
which
was
wettest
month
record
at
study
s,
including
three
normal
rainfalls
(29.6
mm
8.5
h,
25
27.4
3.5
h)
rainstorms
(335
11.5
77.8
9
129.2
5
h).
Soil
moisture
table
responded
rapidly
(<30
min)
during
rainfall.
interface
exhibited
strongest
stability
(coefficient
variation
[CV]
<
8.18%)
collected
more
pre‐event
water,
reflected
by
isotopic
signature
water.
Accordingly,
low
permeability
played
an
role
buffering
infiltration.
Controlled
infiltration‐excess
saturation‐excess
mechanisms,
contribution
surface
total
less
than
3%
events,
significantly
that
(13%–60%).
This
supported
evolution
δ
values
similar
O‐depleted
subsurface
runoff.
Higher
intensity
exceeded
further
increased
possibility
exceeding
infiltration‐saturation
processes.
For
plot
(DSP),
(>44%)
dominated
process;
while
shallow‐soil
(SSP),
(60%)
only
maximum
events.
Moreover,
DSP
greater
SSP.
Surface
slopes
thicker
layers
part
watershed
flood
should
be
considered
carefully
resource
Highlights
Hydrometric
are
used
assess
hydrological
The
much
higher
mechanism
dominates
Slopes
vulnerable
flooding
region.
Ecological Indicators,
Journal Year:
2023,
Volume and Issue:
155, P. 110958 - 110958
Published: Sept. 20, 2023
Human
activities
and
climate
are
two
key
factors
affecting
hydrological
soil
erosion
processes.
Understanding
their
impacts
on
water
discharge
sediment
transport
is
very
important
for
sustainable
development
of
watersheds,
particularly
in
subtropical
regions
with
high
precipitation
loads.
We
here
compared
the
long-term
dynamics
four
large
contiguous
watersheds
China
explored
importance
main
influencing
including
climate,
nature
endowment
such
as
geology,
human
activities.
Significant
differences
have
been
observed
between
terms
(p
<
0.001).
Pairwise
comparison
among
basins
demonstrated
significant
modulus
5
6
pairs
0.05).
The
Lishui
Basin
was
significantly
higher
than
those
other
basins,
mainly
due
to
substantial
presence
steep
slopes
mountainous
region,
which
prone
erosion.
Temporally,
well
synchronized
showing
decreasing
trends
abrupt
change
points
In
contrast,
no
were
detected
discharge,
influenced
by
precipitation.
played
a
predominant
role
reduction
(80%
102%)
(-2%
19%)
across
basins.
Additionally,
our
study
also
showed
land
cover
had
various
basin-independent
transport.
Through
cross-basin
comparisons
changes
transport,
revealed
similarities
driving
mechanisms,
providing
valuable
information
use
planning
resource
management
Land Degradation and Development,
Journal Year:
2023,
Volume and Issue:
35(3), P. 949 - 967
Published: Nov. 5, 2023
Abstract
Rock
outcrops
play
a
crucial
role
in
affecting
hydrological
and
erosion
processes
on
karst
hillslopes.
However,
due
to
various
difficulties
constructing
runoff
plots
field
rocky
slopes,
previous
studies
used
small
metal
flumes
simulate
outcropped
which
greatly
differed
from
the
natural
rock
slopes.
In
this
study,
effects
of
were
studied
slopes
with
soil–rock
conditions
at
larger
plot
scale
(10
m
length
×
2.2
width,
25°
gradient).
Simulated
rainfall
experiments
conducted
four
different
outcrop
coverages
(0%,
5%,
13%,
42%)
under
five
intensities
(30,
60,
90,
120,
150
mm·h
−1
).
The
study
indicated
that
complexed
water
by
playing
multiple
opposite
roles
simultaneously.
It
positively
influences
serving
as
impermeable
surfaces,
providing
preferential
flow
paths,
offering
barriers
Conversely,
it
can
exacerbate
causing
increased
runoff,
concentrating
thus
intensifying
specific
areas.
Besides,
these
varied
coverage
intensity.
main
results
showed
(i)
limited
(5%
13%)
erosion,
but
was
observed
severe
slope
(42%).
Both
“infiltration‐excess”
“saturation‐excess”
mechanisms
coexisted
turns
during
rainfall;
break
“saturation
balance”
tended
occur
abundant
interface
underground
fissures.
(ii)
spatial
variability
uncertainty
resulted
range
variation
velocity
greater
difference
among
three
positions;
also
brought
more
heterogeneity
development
rill
erosion.
(iii)
increase
velocity,
intensify
turbulence,
stream
power,
energy.
significantly
reduced
soil
induced
detachment.
This
contributes
deeper
understanding
behind
how
influence
provides
insights
for
improving
prediction
regions.
Journal of Hydrology,
Journal Year:
2023,
Volume and Issue:
620, P. 129532 - 129532
Published: April 19, 2023
Runoff
generation
thresholds
and
pathways
are
critical
to
understanding
catchment-scale
hydrological
processes.
The
variability
in
catchment
storage,
soil
moisture
dynamics,
rainfall
characteristics
influence
the
spatial
temporal
of
runoff
pathways.
This
study
used
six
years
hourly
hydro-meteorological
datasets
two
independent
(P301
P303)
one
nested
(P300)
headwater
catchments
located
southern
Sierra
Nevada
region
California,
USA,
understand
Further,
we
identified
spatio-temporal
preferential
flow
pathways,
changes
moisture,
vertical
wetting
front
velocity
along
with
their
controlling
factors.
From
analysis
129
rainfall-runoff
events,
it
was
found
that
activated
when
wetness
(i.e.,
storage
plus
rainfall)
greater
than
212
mm,
238
250
mm
P301,
P303,
P300,
respectively.
higher
at
lower
slope,
resulting
thresholds,
compared
upslope
locations
inside
P301
P303.
observed
dominance
(>
60%)
60
cm
90
depth
upper
slope
locations,
respectively,
indicating
a
domination
subsurface
mechanism
these
catchments.
flows
were
more
frequent
during
drought
(2012–2015)
those
normal
(2010–2011).
Furthermore,
deeper
depths,
but
no
consistent
pattern
change
profile.
will
be
useful
for
field
hydrologists
modelers
design
an
experimental
setup
develop
realistic
model
considering
variation
forested
montane
Mediterranean
region.
