Water Resources Management,
Journal Year:
2023,
Volume and Issue:
37(3), P. 1013 - 1032
Published: Jan. 27, 2023
Abstract
The
increasing
frequency
of
droughts
and
floods
due
to
climate
change
has
severely
affected
water
resources
across
the
globe
in
recent
years.
An
optimal
design
for
scheduling
management
irrigation
is
thus
urgently
needed
adapt
agricultural
activities
changing
climate.
accurate
estimation
reference
crop
evapotranspiration
(ET0),
a
vital
hydrological
component
balance
need,
tiresome
task
if
all
relevant
climatic
variables
are
unavailable.
This
study
investigates
potential
four
ensemble
techniques
estimating
precise
values
daily
ET0
at
representative
stations
10
agro-climatic
zones
state
Karnataka,
India,
from
1979
2014.
performance
these
models
was
evaluated
by
using
several
combinations
as
inputs
tenfold
cross-validation.
outcomes
indicated
that
predictions
based
on
were
most
comparison
with
other
input
combinations.
random
forest
regressor
found
deliver
best
among
measures
considered
(Nash–Sutcliffe
efficiency,
1.0,
root-mean-squared
error,
0.016
mm/day,
mean
absolute
0.011
mm/day).
However,
it
incurred
highest
computational
cost,
whereas
cost
bagging
model
linear
regression
lowest.
extreme
gradient-boosting
delivered
stable
modified
training
dataset.
work
here
shows
can
be
recommended
ET
0
users’
interests.
The
year
2022
was
the
driest
in
Portugal
since
1931
with
97%
of
territory
severe
drought.Water
is
especially
important
for
agricultural
sector
Portugal,
as
it
represents
78%
total
consumption
according
to
Water
Footprint
report
published
2010.Reference
evapotranspiration
essential
due
its
importance
optimal
irrigation
planning
that
reduces
water
consumption.This
study
analyzes
and
proposes
a
framework
forecast
daily
reference
at
eight
stations
from
2012
without
relying
on
public
meteorological
forecasts.The
data
include
obtained
sensors
included
stations.The
goal
perform
multi-horizon
forecasting
using
multiple
related
covariates.The
combines
processing
analysis
several
state-of-the-art
methods
including
classical,
linear,
tree-based,
artificial
neural
network
ensembles.Then,
an
ensemble
all
trained
models
proposed
recent
bioinspired
metaheuristic
named
Coronavirus
Optimization
Algorithm
weight
predictions.The
results
terms
MAE
MSE
are
reported,
indicating
our
approach
achieved
0.658.
Heliyon,
Journal Year:
2023,
Volume and Issue:
9(5), P. e16290 - e16290
Published: May 1, 2023
Knowledge
of
the
stage-discharge
rating
curve
is
useful
in
designing
and
planning
flood
warnings;
thus,
developing
a
reliable
fundamental
crucial
component
water
resource
system
engineering.
Since
continuous
measurement
often
impossible,
relationship
generally
used
natural
streams
to
estimate
discharge.
This
paper
aims
optimize
using
generalized
reduced
gradient
(GRG)
solver
test
accuracy
applicability
hybridized
linear
regression
(LR)
with
other
machine
learning
techniques,
namely,
regression-random
subspace
(LR-RSS),
regression-reduced
error
pruning
tree
(LR-REPTree),
regression-support
vector
(LR-SVM)
regression-M5
pruned
(LR-M5P)
models.
An
application
these
hybrid
models
was
performed
modeling
Gaula
Barrage
problem.
For
this,
12-year
historical
data
were
collected
analyzed.
The
daily
flow
(m3/s)
stage
(m)
from
during
monsoon
season,
i.e.,
June
October
only
03/06/2007
31/10/2018,
for
discharge
simulation.
best
suitable
combination
input
variables
LR,
LR-RSS,
LR-REPTree,
LR-SVM,
LR-M5P
identified
decided
gamma
test.
GRG-based
equations
found
be
as
effective
more
accurate
conventional
equations.
outcomes
GRG,
compared
observed
values
based
on
Nash
Sutcliffe
model
efficiency
coefficient
(NSE),
Willmott
Index
Agreement
(d),
Kling-Gupta
(KGE),
mean
absolute
(MAE),
bias
(MBE),
relative
percent
(RE),
root
square
(RMSE)
Pearson
correlation
(PCC)
determination
(R2).
LR-REPTree
(combination
1:
NSE
=
0.993,
d
0.998,
KGE
0.987,
PCC(r)
0.997,
R2
0.994
minimum
value
RMSE
0.109,
MAE
0.041,
MBE
−0.010
RE
−0.1%;
2;
0.941,
0.984,
0.
923,
973,
947
331,
0.143,
−0.089
−0.9%)
superior
all
combinations
testing
period.
It
also
noticed
that
performance
alone
LR
its
(i.e.,
LR-M5P)
better
than
curve,
including
GRG
method.