JAWRA Journal of the American Water Resources Association,
Journal Year:
2025,
Volume and Issue:
61(1)
Published: Feb. 1, 2025
ABSTRACT
This
study
evaluated
hydroclimate
projections
and
effects
on
runoff
at
National
Wildlife
Refuges
in
a
semiarid
region
of
the
western
United
States
(U.S.
Fish
Service
Region
6)
using
mean
air
temperature
(TAVE)
precipitation
(PPT)
inputs
(RO)
output
from
national
application
Monthly
Water
Balance
Model
(MWBM).
An
ensemble
statistically
downscaled
global
circulation
models
for
two
future
emissions
scenarios
Coupled
Intercomparison
Project
3
5
(CMIP3
5)
were
assessed
refuges
years
1950–2099.
TAVE,
PPT,
RO
departures
baseline
conditions
analyzed
MWBM
hydrologic
response
units
within
refuge
boundaries.
Seasonal
results
across
four
periods:
historical
(1951–1969),
(1981–1999),
2050
(2041–2059),
2080
(2071–2089).
Projected
TAVE
increases
all
time
periods,
whereas
PPT
are
much
more
variable
ecoregions.
Using
high
emission
scenario,
summer
monthly
range
4.8°C
to
5.5°C
by
2080.
Summer
vary
−5.7
3.9
mm
(up
14%
decrease),
with
decreases
41%
refuges.
−16.7
0.2
60%
71%
Under
same
winter
increase
most
These
will
create
substantial
challenges
conservation
management
region.
Water Resources Research,
Journal Year:
2023,
Volume and Issue:
59(9)
Published: Aug. 16, 2023
Abstract
Growth
and
contraction
of
headwater
stream
networks
determine
habitat
extent,
open
a
window
to
the
hyporheic
zone.
A
fundamental
challenge
is
observation
this
process:
wetted
channel
extent
dynamic
in
space
time,
with
length
varying
by
orders
magnitude
over
course
single
storm
event
catchments.
To
date,
observational
data
sets
are
produced
from
boots‐on‐the‐ground
campaigns,
drone
imaging,
or
flow
presence
sensors,
which
often
laborious
limited
their
spatial
temporal
extents.
Here,
we
evaluate
satellite
imagery
as
means
detect
via
machine
learning
methods
trained
on
local
surveys
extent.
Even
where
features
smaller
than
imagery's
resolution,
surface
water
may
be
imprinted
upon
spectral
signature
an
individual
pixel.
For
two
catchments
northern
California
minimal
riparian
canopy
cover
highly
train
random
forest
model
RapidEye
captured
contemporaneously
existing
predict
(accuracy
>91%).
The
used
produce
length‐discharge
(L‐Q)
relations
calculate
spatially
distributed
estimates
capacity
exchange.
sharp
break
occurs
main
stem
channels
lower
order
tributaries,
resulting
stepped
L‐Q
relationship
that
cannot
traditionally
power
law
models.
Remotely
sensed
powerful
tool
for
mapping
at
high
resolution.
BioScience,
Journal Year:
2025,
Volume and Issue:
75(1), P. 68 - 91
Published: Jan. 1, 2025
Abstract
Connectivity—the
flows
and
exchanges
of
organisms,
materials,
energy
within
among
watersheds—is
a
central
paradigm
in
ecosystem
science.
Changes
those
connections
have
consequences
for
functioning
water
quality
downstream
upstream.
Therefore,
connectivity
is
cornerstone
federal
protection
under
the
United
States
Clean
Water
Act
(CWA).
In
present
article,
we
review
science
connectivity,
explain
history
changes
CWA
jurisdiction
defining
waters
States,
discuss
implications
US
policy,
highlight
key
steps
to
align
that
policy
with
The
Sackett
v.
EPA
(2023)
Supreme
Court
decision
significantly
reduced
wetlands
headwaters,
disregarding
their
larger,
protected
waterbodies.
To
fulfill
goals
restore
maintain
chemical,
physical,
biological
integrity
U.S.
waters,
Congress
must
amend
act,
fully
recognizing
multidimensional
aquatic
ecosystems
ultimately
incorporating
these
into
ecosystem-level
policy.
JAWRA Journal of the American Water Resources Association,
Journal Year:
2025,
Volume and Issue:
61(1)
Published: Feb. 1, 2025
ABSTRACT
This
study
evaluated
hydroclimate
projections
and
effects
on
runoff
at
National
Wildlife
Refuges
in
a
semiarid
region
of
the
western
United
States
(U.S.
Fish
Service
Region
6)
using
mean
air
temperature
(TAVE)
precipitation
(PPT)
inputs
(RO)
output
from
national
application
Monthly
Water
Balance
Model
(MWBM).
An
ensemble
statistically
downscaled
global
circulation
models
for
two
future
emissions
scenarios
Coupled
Intercomparison
Project
3
5
(CMIP3
5)
were
assessed
refuges
years
1950–2099.
TAVE,
PPT,
RO
departures
baseline
conditions
analyzed
MWBM
hydrologic
response
units
within
refuge
boundaries.
Seasonal
results
across
four
periods:
historical
(1951–1969),
(1981–1999),
2050
(2041–2059),
2080
(2071–2089).
Projected
TAVE
increases
all
time
periods,
whereas
PPT
are
much
more
variable
ecoregions.
Using
high
emission
scenario,
summer
monthly
range
4.8°C
to
5.5°C
by
2080.
Summer
vary
−5.7
3.9
mm
(up
14%
decrease),
with
decreases
41%
refuges.
−16.7
0.2
60%
71%
Under
same
winter
increase
most
These
will
create
substantial
challenges
conservation
management
region.
