Hydrology and earth system sciences,
Journal Year:
2023,
Volume and Issue:
27(17), P. 3221 - 3239
Published: Sept. 8, 2023
Abstract.
The
assessment
of
effective
hydraulic
properties
at
the
catchment
scale,
i.e.,
conductivity
(K)
and
transmissivity
(T),
is
particularly
challenging
due
to
sparse
availability
hydrological
monitoring
systems
through
stream
gauges
boreholes.
To
overcome
this
challenge,
we
propose
a
calibration
methodology
which
only
considers
information
from
digital
elevation
model
(DEM)
spatial
distribution
network.
built
on
assumption
that
groundwater
system
main
driver
controlling
density
extension,
where
perennial
network
reflects
intersection
table
with
topography.
Indeed,
seepage
surface
primarily
controlled
by
topography,
aquifer
thickness
dimensionless
parameter
K/R,
R
average
recharge
rate.
Here,
use
process-based
parsimonious
3D
flow
calibrate
K/R
minimizing
relative
distances
between
observed
simulated
generated
zones.
By
deploying
in
24
selected
headwater
catchments
located
northwestern
France,
demonstrate
method
successfully
predicts
extent
for
80
%
cases.
Results
show
high
sensitivity
extension
low-order
streams
limited
impacts
DEM
resolution
as
long
remains
consistent
observations.
assuming
an
rate,
found
K
values
vary
1.0×10-5
1.1×10-4
m
s−1,
agreement
local
estimates
derived
tests
independent
calibrated
model.
With
emergence
global
remote-sensing
databases
compiling
high-resolution
networks,
approach
provides
new
opportunities
assess
unconfined
aquifers
ungauged
basins.
Water Science & Technology Water Supply,
Journal Year:
2023,
Volume and Issue:
23(6), P. 2466 - 2490
Published: May 11, 2023
Abstract
River
ecosystems
have
become
fragile
due
to
river
flow
alterations
in
the
wake
of
expending
structural
controls
triggered
by
ever-increasing
demands
freshwater.
The
efforts
alleviate
effects
paved
way
for
emergence
and
expansion
concept
e-flows.
role
e-flows
ecosystem
protection
water
resources
management
is
not
yet
fully
understood
practiced.
This
review
summarizes
historical
evolution
recaps
its
assessment
methods;
analyzes
impacts
alterations;
indicates
challenges
been
facing
identifies
gaps
focus
research.
A
total
303
articles
published
since
2010
were
collected
systematically
assessed.
Most
publications
are
focused
on
describing
alterations.
According
findings
this
meta-analysis,
less
attention
given
basin-scale,
social
policy
aspects
Furthermore,
little
consideration
part
played
groundwater
along
with
roles
maintaining
health
floodplains
intermittent
rivers
ephemeral
streams.
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(4)
Published: April 1, 2024
Abstract
Despite
rises
in
drought
frequency
and
human
water
demands,
streamflow
regime
shifts
from
perennial
to
non‐perennial
have
not
been
evaluated
many
arid/semi‐arid
regions.
To
document
shifts,
we
created
a
methodology
that
classifies
streams
as
naturally
or
non‐perennial.
Our
classification
used
historical,
minimally
disturbed‐quality
USGS
gages
(1950–2015)
across
California.
The
number
of
consecutive
zero
flow
days
(≥5
days)
was
classify
61%
(96/158)
39%
(62/158)
non‐perennial,
respectively.
We
developed
random
forest
model
predict
class
based
on
climate
watershed
characteristics.
identify
compared
the
observed
contemporary
(1980–2023)
disturbed
with
their
modeled,
natural
class.
For
most
gages,
predicted
classes
were
same,
but
13%
(7/52)
had
modeled
an
class,
indicating
drying
trend.
Among
22%
(64/290)
shifted
7%
(21/290)
perennial.
Trends
minimum
7‐day
moving
average
zero‐flow
provided
further
evidence
at
streams,
no
pattern
gages.
results
indicate
few
become
date,
experienced
climate.
Streams
impacted
by
activities
greater
rates,
regulation
has
caused
some
By
quantifying
expected
regimes,
this
work
can
help
monitor,
manage,
conserve
stream
ecosystems.
Hydrology and earth system sciences,
Journal Year:
2023,
Volume and Issue:
27(17), P. 3221 - 3239
Published: Sept. 8, 2023
Abstract.
The
assessment
of
effective
hydraulic
properties
at
the
catchment
scale,
i.e.,
conductivity
(K)
and
transmissivity
(T),
is
particularly
challenging
due
to
sparse
availability
hydrological
monitoring
systems
through
stream
gauges
boreholes.
To
overcome
this
challenge,
we
propose
a
calibration
methodology
which
only
considers
information
from
digital
elevation
model
(DEM)
spatial
distribution
network.
built
on
assumption
that
groundwater
system
main
driver
controlling
density
extension,
where
perennial
network
reflects
intersection
table
with
topography.
Indeed,
seepage
surface
primarily
controlled
by
topography,
aquifer
thickness
dimensionless
parameter
K/R,
R
average
recharge
rate.
Here,
use
process-based
parsimonious
3D
flow
calibrate
K/R
minimizing
relative
distances
between
observed
simulated
generated
zones.
By
deploying
in
24
selected
headwater
catchments
located
northwestern
France,
demonstrate
method
successfully
predicts
extent
for
80
%
cases.
Results
show
high
sensitivity
extension
low-order
streams
limited
impacts
DEM
resolution
as
long
remains
consistent
observations.
assuming
an
rate,
found
K
values
vary
1.0×10-5
1.1×10-4
m
s−1,
agreement
local
estimates
derived
tests
independent
calibrated
model.
With
emergence
global
remote-sensing
databases
compiling
high-resolution
networks,
approach
provides
new
opportunities
assess
unconfined
aquifers
ungauged
basins.
