Large
pieces
of
wood
transported
by
flash
floods
and
debris
flows
can
influence
the
fluid
movement
process
in
forested
mountainous
streams,
yet
little
is
known
about
characteristics
sediment
deposition
velocity
variation
induced
large
accumulated
at
different
obstacles,
such
as
natural
blocked
wood,
check
dams,
bridges.
In
this
article,
findings
from
flume
experiments
examined
how
fluids
densities
affected
varied
lengths
well
features
driven
accumulation
three
types
barriers.
The
interception
rate
increased
gradually
with
increasing
relative
length
L/b;
however,
growth
changed
bridge
L/b=4/3
1,
respectively.
then
formed
logjams,
which
resulted
deposition.
maximum
6.5
times
that
without
depth
5.0
wood.
therefore,
significantly
change
channel
topography.
regulatory
effect
almost
negligible
L/b
=
1/3.
With
length,
logjams
have
a
regulating
on
velocity,
increases
length.
rates
are
0.36,
0.33,
0.42
for
barriers
bridges,
River Research and Applications,
Journal Year:
2024,
Volume and Issue:
40(3), P. 322 - 340
Published: Jan. 2, 2024
Abstract
Process‐based
river
restoration
seeks
to
restore
processes
such
as
channel‐floodplain
connectivity
that
create
and
maintain
corridor
functions.
can
fail
produce
the
desired
results
if
geomorphic
context
is
not
effectively
incorporated
into
design.
Geomorphic
of
a
reach
refers
controls
on
contemporary
form
process.
Controls
at
catchment‐
reach‐scale
include
geologic
history,
biophysical
characteristics,
legacies
past
human
alterations,
position
within
network,
geometry,
base
level
stability,
disturbance
regime,
alterations
corridor.
We
conceptualize
reflecting
interactions
among
fluxes
material
context.
discuss
how
an
understanding
be
used
select
approach
provide
examples
achieve
outcomes
when
considered.
Within
toolbox
methods
implement
process‐based
restoration,
we
differentiate
alteration
inputs
through
from
and/or
Historical,
biotic,
geologic/geomorphic,
reference
sites
inform
targets.
Restoration
strongly
influenced
by
perceptions
what
appropriate
achievable
site
diverse
communities
influencing
may
differ
in
their
perceptions.
Geomorphically
based
conceptual
guidelines,
River
Styles
Framework,
effective
platform
for
incorporating
restoration.
Water Resources Research,
Journal Year:
2025,
Volume and Issue:
61(1)
Published: Jan. 1, 2025
Abstract
Here,
we
explore
how
differences
in
morphologic
heterogeneity
due
to
logjams
and
secondary
channels
drive
transient
storage
across
discharge
two
stream
reaches
within
the
Front
Range
of
Colorado,
USA.
During
three
tracer
tests
conducted
from
baseflow
near‐peak
snowmelt,
collected
instream
fluid
conductivity
measurements
electrical
resistivity
surveys
characterize
movement
surface
subsurface
system.
The
reach
with
an
intermittent
channel
exhibited
greater
storage,
driving
hyporheic
exchange
flows,
compared
a
single
logjam
perennial
channel.
As
increased,
(a)
backwater
pools
created
by
increased
size
both
systems,
(b)
complexity
as
forced
flow
into
channels,
(c)
flowpath
distribution
increased.
Various
indices
provide
some
insight
on
solute
retention
but
compressing
data
this
system
simple
values
was
unintuitive
given
noise
breakthrough‐curve
tails
peaks
concentration.
While
increases
reaches,
may
not.
Flushing
tracers
is
highest
at
medium
interpreted
inversions
perhaps
because
tradeoff
between
increasing
extent
flowpaths
larger
pressure
gradients
for
flow.
This
work
one
first
controls
systems
multiple
evolving
planform
using
geophysical
constrain
solutes.
Hydrological Processes,
Journal Year:
2024,
Volume and Issue:
38(4)
Published: April 1, 2024
Abstract
Reservoir
sedimentation
affects
lifespan,
hydropower
generation,
water
resource
use,
and
ecosystem
sustainability.
In
this
study,
using
measured
data
from
the
world‐renowned
Three
Gorges
(TGR),
sediment
transport
capacity
was
analysed
2002
to
2020
at
four
TGR
gauging
stations
(Cuntan,
Qingxichang,
Wanxian,
Miaohe).
The
result
indicated
that:
(1)
a
significant
decrease
in
occurred
before
after
dam
construction,
with
an
overall
reduction
of
82%
perennial
backwater
zone.
Notably,
Miaohe
experienced
reductions
40%,
91%,
59%,
respectively.
Since
initial
operation
phase,
their
maximum
monthly
has
consistently
July.
(2)
Changes
level
front
dam,
incoming
flow,
influxes
were
primary
factors
driving
annual
variations
capacity.
Among
affecting
variation
along
TGR,
influence
cross‐sectional
morphology
more
pronounced
than
that
distance
dam.
Sediment
capacities
wide
shallow
sections
considerably
lower
those
narrow
deep
sections.
(3)
A
amplitude
index
()
proposed
assess
dynamics
within
which
effectively
characterized
conditions
based
on
relative
importance
these
influencing
factors.
These
findings
provide
theoretical
basis
for
operational
strategies
offer
insights
into
patterns
changes
reservoir
areas
construction
other
river‐type
reservoirs.
Water Resources Research,
Journal Year:
2023,
Volume and Issue:
59(11)
Published: Nov. 1, 2023
Abstract
In‐stream
wood
structures,
such
as
single
logs,
river
steps,
and
debris
dams,
are
known
to
drive
hyporheic
flow,
defined
the
flow
that
goes
into
subsurface
region
then
back
free‐flowing
surface
water.
The
plays
an
important
role
in
regulating
water
quality
biogeochemical
cycles
rivers.
Here,
we
investigated
impact
of
a
channel‐spanning
porous
log
jam,
representing
piles
on
through
combination
direct
visualization
theories.
Specifically,
developed
method
using
refractive
index‐matched
sediment
directly
visualize
around
below
formed
by
cylindrical
rods,
laboratory
flume.
We
tracked
velocity
fluorescent
dye
moving
transparent
underneath
jam.
In
addition,
measured
profile
spatially
varying
near
Our
results
show
normalized
jam‐induced
flux
remained
smaller
than
10%
at
Froude
numbers
()
0.06
increased
factor
five
with
increasing
.
combined
mass
momentum
conservation
equations
Darcy's
equation
explain
dependency
Further,
observed
,
dropped
noticeably
turbulent
kinetic
energy
immediately
downstream
side
These
findings
will
facilitate
future
quantification
caused
jams.
Geomorphology,
Journal Year:
2024,
Volume and Issue:
453, P. 109135 - 109135
Published: March 4, 2024
To
design
and
evaluate
river
restoration
projects
with
wood,
it
is
crucial
to
understand
how
the
placement
of
wood
will
alter
flow
bed
morphology.
This
information
still
missing.
address
this,
flume
experiments
were
conducted
a
single
log
placed
on
mobile
uniform
grain
size.
The
effect
diameter,
orientation
flow,
length
variability
morphology
was
studied
for
various
initial
conditions.
Even
increased
variability,
herein
defined
as
spatial
in
both
velocity
turbulent
kinetic
energy.
For
each
at
channel
center,
logs
generated
symmetric
scour
pattern
alongside
downstream
due
shear
turbulence
by
log.
A
steady,
adjusted
cross-section
reached
cessation
erosion,
which
occurred
when
stress
decreased
below
critical
velocity.
Logs
larger
diameter
tended
erode
more
deeply,
so
that
final,
similar
different
dimensions.
Changes
topography
affected
wake
characteristics.
small
changes
longer
zones
reduced
velocity,
can
increase
residence
time
organic
matter
or
nutrients
region.
big
created
deepest
longest
holes,
may
locally
reduce
stream
temperature
improve
fish
habitat
during
summer.
River Research and Applications,
Journal Year:
2024,
Volume and Issue:
40(8), P. 1626 - 1641
Published: June 18, 2024
Abstract
Recognition
of
the
important
physical
and
ecological
roles
played
by
large
wood
in
channels
on
floodplains
has
grown
substantially
during
recent
decades.
Although
continues
to
be
routinely
removed
from
many
river
corridors
worldwide,
practice
reintroduction
spread
across
United
States,
Kingdom
western
Europe,
Australia,
New
Zealand.
The
state‐of‐science
regarding
working
with
rivers
was
discussed
a
workshop
held
Colorado,
USA,
September
2022
40
participants
who
are
scientists
practitioners
UK,
Japan.
objectives
this
paper
present
findings
workshop;
summarize
two
case
studies
restoration
States;
provide
suggestions
for
advancing
management.
We
results
based
participant
judgements
recommendations
respect
to:
(i)
limitations
key
barriers
using
wood,
which
reflect
perceptions
practicalities;
(ii)
gaps
use
management;
(iii)
scenarios
is
generally
used
effectively;
(iv)
not
effectively.
illustrate
importance
local
geomorphic
context,
configuration
complexity
potential
modification
corridor
morphology
enhance
desired
benefits.
Moving
forward,
we
stress
collaboration
disciplines
communities
research
scientists,
practitioners,
regulators,
stakeholders;
accounting
stakeholder
wood;
increasing
non‐scientist
access
latest
knowledge.
Geophysical Research Letters,
Journal Year:
2023,
Volume and Issue:
50(24)
Published: Dec. 12, 2023
Abstract
Snow
avalanches
are
thought
to
influence
large
wood
dynamics
within
mountain
streams,
but
studies
that
explicitly
quantify
their
impact
minimal.
In
three
headwater
catchments
of
the
Frying
Pan
River,
Colorado,
USA,
we
found
loads
in
stream
reaches
intersected
by
avalanche
pathways
ranged
from
220
8,500
m
3
/ha
and
were
significantly
greater
than
non‐avalanched
reaches.
Inter‐catchment
differences
number
occurrences
not
reflected
control
reach
loads,
suggesting
elevated
may
be
restricted
general
vicinity
pathway.
However,
sizable
volumes
generated
notable
geomorphic
impacts,
indicating
can
create
hotspots
in‐stream
complexity
overall
habitat
mosaic
ecosystem.
Loads
moreover
literature
values
for
similar
streams
recruitment
processes,
emphasizing
importance
snow
as
a
mechanism.
