Science,
Journal Year:
2022,
Volume and Issue:
376(6600), P. 1447 - 1452
Published: June 23, 2022
Rivers
support
indispensable
ecological
functions
and
human
health
infrastructure.
Yet
limited
river
sampling
hinders
our
understanding
of
consequential
changes
to
systems.
Satellite-based
estimates
suspended
sediment
concentration
flux
for
414
major
rivers
reveal
widespread
global
change
that
is
directly
attributable
activity
in
the
past
half-century.
Sediment
trapping
by
dams
hydrologic
north
has
contributed
declines
49%
pre-dam
conditions.
Recently,
intensive
land-use
south
increased
erosion,
with
on
average
41
±
7%
greater
than
1980s.
This
north-south
divergence
rapidly
reconfigured
patterns
oceans,
dominant
sources
shifting
from
Asia
South
America.
Journal of Geophysical Research Earth Surface,
Journal Year:
2023,
Volume and Issue:
128(8)
Published: July 20, 2023
Abstract
Retrogressive
thaw
slumps
(RTSs)
have
become
a
dominant
geomorphic
event
in
permafrost
regions
due
to
the
modern
climate
change.
However,
roles
of
topographic,
vegetation,
and
soil
factors
influencing
spatial
distribution
recurrence
RTSs
remain
not
fully
understood.
Here,
we
identified
formation
459
during
2008–2021
using
satellite
images
central
Qinghai‐Tibet
Plateau
(Northwest
Beiluhe
Basin,
239
km
2
).
We
found
that
topographic
environmental
attributes
exhibited
strong
correlations
with
variation
RTS
density.
The
RTS‐affected
areas
had
higher
slope,
elevation,
relative
slope
position,
normalized
difference
vegetation
index,
water
content,
lower
bulk
density
than
other
landscapes.
Regarding
influence
on
activity
status
2018–2020,
content
were
advantageous
for
RTSs.
larger
sizes
presenting
an
elongated
shape
more
likely
be
active.
Additionally,
examined
headwall
based
fractal
dimension
UAV‐based
orthophoto.
becomes
complicated
small‐scale
thawing
ice‐rich
permafrost,
which
may
further
induce
subsequent
slumping.
Higher
air
temperature
triggers
new
RTSs,
increased
precipitation
responsible
Our
findings
can
enhance
our
understanding
development
pattern
mechanism
regions.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Jan. 24, 2024
Recent
climate
change
has
caused
an
increase
in
warming-driven
erosion
and
sediment
transport
processes
on
the
Tibetan
Plateau
(TP).
Yet
a
lack
of
measurements
hinders
our
understanding
basin-scale
dynamics
associated
spatiotemporal
changes.
Here,
using
satellite-based
estimates
suspended
sediment,
we
reconstruct
quantitative
history
patterns
major
headwater
basins
from
1986
to
2021.
Out
13
warming-affected
regions,
63%
rivers
have
experienced
significant
increases
flux.
Despite
such
intensified
erosion,
find
that
30%
total
flux
been
temporarily
deposited
within
rivers.
Our
findings
reveal
pronounced
heterogeneity
across
basins.
The
recurrent
fluctuations
erosion-deposition
river
channels
not
only
result
underestimation
magnitude
but
also
drive
continuous
transformations
valley
morphology,
thereby
endangering
local
ecosystems,
landscape
stability,
infrastructure
project
safety.
Proceedings of the National Academy of Sciences,
Journal Year:
2024,
Volume and Issue:
121(23)
Published: May 29, 2024
The
Asian
water
tower
(AWT)
serves
as
the
source
of
10
major
river
systems
and
supports
lives
~2
billion
people.
Obtaining
reliable
precipitation
data
over
AWT
is
a
prerequisite
for
understanding
cycle
within
this
pivotal
region.
Here,
we
quantitatively
reveal
that
“observed”
considerably
underestimated
in
view
observational
evidence
from
three
components,
namely,
evapotranspiration,
runoff,
accumulated
snow.
We
found
paradoxes
appear
if
so-called
observed
corrected,
actual
evapotranspiration
exceeding
precipitation,
unrealistically
high
runoff
coefficients,
snow
equivalent
contemporaneous
precipitation.
then
explain
cause
underestimation
instrumental
error
caused
by
wind-induced
gauge
undercatch
representativeness
sparse-uneven
density
complexity
local
surface
conditions.
These
findings
require
us
to
rethink
previous
results
concerning
cycle,
prompting
study
discuss
potential
solutions.
Geophysical Research Letters,
Journal Year:
2024,
Volume and Issue:
51(12)
Published: June 14, 2024
Abstract
Bedload
sediment
transport
plays
an
important
role
in
the
evolution
of
rivers,
marshes
and
deltas.
In
these
aquatic
environments,
vegetation
is
widespread,
plant
species
have
unique
morphology.
However,
impact
real
morphology
on
flow
has
not
been
quantified.
This
study
used
model
plants
with
morphology,
based
Phragmites
australis
,
Acorus
calamus
Typha
latifolia
.
The
frontal
area
increases
away
from
bed,
which
leads
to
higher
near‐bed
velocity
than
would
be
predicted
depth‐average
area.
A
coefficient
was
defined
quantify
vertically‐varied
Laboratory
experiments
confirmed
that
improved
prediction
velocity,
turbulent
kinetic
energy
bedload
rate
canopies
realistic
Plant
can
alter
rates
by
up
order
magnitude,
relative
assumption
uniform
