Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(3)
Published: March 1, 2024
Abstract
Coupled
simulations
of
surface
and
variably
saturated
subsurface
flow,
termed
integrated
hydrologic
models
(IHMs),
can
provide
powerful
insights
into
the
complex
dynamics
watersheds.
The
system
governing
equations
solved
by
an
IHM
is
non‐linear,
making
them
a
significant
computational
burden
challenging
to
accurately
parameterize.
Consequently,
large
fraction
studies
date
have
been
“numerical
hypothesis
testing”
studies,
but,
as
parallel
computing
continues
improve,
IHMs
are
approaching
point
where
they
might
also
be
useful
predictive
tools.
For
this
become
reality,
uncertainty
such
highly
parameterized
must
considered.
However,
seldom
considered
in
literature,
likely
due
long
runtimes
simulations.
questions
herein
how
much
there
for
common
watershed
simulation
scenario,
it
that
any
one
realization
will
give
same
relative
change
other
perturbation
recharge?
A
stochastic
ensemble
250
permeability
field
realizations
was
used
show
high‐mountain
headwaters
systems
dominated
subsurface.
Recharge
scenarios
echo
these
results,
but
changes
streamflow
or
groundwater
pressure
heads
were
significantly
smaller
than
their
base‐case
values.
main
finding
do
confident,
estimates
watersheds,
even
when
specific
outputs
may
high.
Hydrological Processes,
Journal Year:
2018,
Volume and Issue:
32(7), P. 923 - 938
Published: Feb. 13, 2018
Abstract
In
an
aquifer
system
with
complex
hydrogeology,
mixing
of
groundwater
different
ages
could
occur
associated
various
flow
pathways.
this
study,
we
applied
age‐estimation
techniques
(lumped
parameter
model
and
numerical
model)
to
characterize
age
distributions
the
major
pathways
nitrate
contamination
in
Gosan
agricultural
field,
Jeju
Island.
According
lumped
model,
study
area
be
explained
by
binary
young
(4–33
years)
old
water
component
(>60
years).
The
hydrogeologic
regimes
local
heterogeneity
observed
(multilayered
aquifer,
well
leakage
hydraulics)
were
particularly
reflected
model.
predicted
that
regional
responded
fertilizer
applications
more
rapidly
(mean
age:
9.7–22.3
than
as
estimated
other
models.
Our
results
demonstrated
application
comparison
multiple
methods
can
useful
understand
better
characteristics
(pathways),
accordingly,
reduce
risk
improper
management
plans
arising
from
heterogeneity.
Journal of Hydrology,
Journal Year:
2024,
Volume and Issue:
633, P. 130848 - 130848
Published: Feb. 8, 2024
Informing
groundwater
recharge
in
arid
environments
is
both
challenging
and
necessary
for
understanding
complex
changing
water
systems,
making
well-informed
aquifer
management
decisions.
The
difficulty
with
interpreting
lies
the
sporadic
often
unpredictable
opportunities.
There
a
gap
between
theoretical
age
distributions
based
on
physics
of
flow
interpretation
real
tracer
data.
This
amplified
transient
environments.
study
uses
deconvolution
approach
constrained
by
probable
events
to
interpret
variable
Weeli
Wolli
Creek
alluvial
fan,
semi-arid
Pilbara
region.
paired
spatial
correlation
establish
relationships
wells,
space
proxy
time
interpretation.
Spatial
also
helps
address
data
density
requirement
deconvolution.
resulting
model
was
able
identify
specific
last
100
years
as
contributors
recharge,
well
highlighting
effects
mine
dewatering
catchment.
In
addition,
interpretations
showed
recharging
along
channels
active
varying
over
time.
level
detail
studies
move
toward
more
meaningful
environmental
planning.
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(3)
Published: March 1, 2024
Abstract
Coupled
simulations
of
surface
and
variably
saturated
subsurface
flow,
termed
integrated
hydrologic
models
(IHMs),
can
provide
powerful
insights
into
the
complex
dynamics
watersheds.
The
system
governing
equations
solved
by
an
IHM
is
non‐linear,
making
them
a
significant
computational
burden
challenging
to
accurately
parameterize.
Consequently,
large
fraction
studies
date
have
been
“numerical
hypothesis
testing”
studies,
but,
as
parallel
computing
continues
improve,
IHMs
are
approaching
point
where
they
might
also
be
useful
predictive
tools.
For
this
become
reality,
uncertainty
such
highly
parameterized
must
considered.
However,
seldom
considered
in
literature,
likely
due
long
runtimes
simulations.
questions
herein
how
much
there
for
common
watershed
simulation
scenario,
it
that
any
one
realization
will
give
same
relative
change
other
perturbation
recharge?
A
stochastic
ensemble
250
permeability
field
realizations
was
used
show
high‐mountain
headwaters
systems
dominated
subsurface.
Recharge
scenarios
echo
these
results,
but
changes
streamflow
or
groundwater
pressure
heads
were
significantly
smaller
than
their
base‐case
values.
main
finding
do
confident,
estimates
watersheds,
even
when
specific
outputs
may
high.
