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Evaluation of a semi-distributed model through an assessment of the spatial coherence of Intercatchment
Groundwater Flows
Alban de Lavenne, Guillaume Thirel, Vazken Andréassian, C. Perrin, M.H.
Ramos
To cite this version:
Alban de Lavenne, Guillaume Thirel, Vazken Andréassian, C. Perrin, M.H. Ramos. Evaluation of a semi-distributed model through an assessment of the spatial coherence of Intercatchment Groundwater Flows. EGU General Assembly 2016, Apr 2016, Vienna, Austria. Geophysical Research Abstracts, 18, pp.1, 2016. �hal-02603536�
EVALUATION OF A SEMI-DISTRIBUTED MODEL THROUGH AN ASSESSMENT
OF THE SPATIAL CONSISTENCY OF INTERCATCHMENT GROUNDWATER FLOWS
E P
Interception En
Pn-Ps Es
Pn
Ps
0.9 0.1
UH2
Q x1
x3 F(x2,x5)
Q1 Q9
Qd Qr
S
R Perc Production
store
Routing store
2.x4
Pr
F(x2,x5)
E P
Interception En
Pn-Ps Es
Pn
Ps
0.9 0.1
UH2
Q x1
x3 F(x2,x5)
Q1 Q9
Qd Qr
S
R Perc Production
store
Routing store
2.x4 Pr
F(x2,x5)
E P
Interception En
Pn-Ps Es
Pn
Ps
0.9 0.1
UH2
Q x1
x3 F(x2,x5)
Q1 Q9
Qd Qr
S
R Perc Production
store
Routing store
2.x4
Pr
F(x2,x5)
C C
Upstream catchment 1 Upstream catchment 2
Downstream catchment 3
1 2 3
Model structure 1 Model structure 2
IGF IGF IGF IGF
IGF IGF
We propose to evaluate two structures of a semi- distributed model using spatial consistency of simulated intercatchment groundwater flows (IGF).
The idea is that the water that is lost in one place should be recovered somewhere else within the catchment to guarantee a spatially consistent water balance in time.
IGF spatial consistency
Water balance analysis
Evaluation period: 1980−2010
Calibration period: 1980−1994 Evaluation period: 1980−2010
Calibration period: 1995−2010
0 10000 20000
Lumped GR5J
Semi−distributed GR5J v1.0
Semi−distributed GR5J v2.0 Lumped GR5J
Semi−distributed GR5J v1.0
Semi−distributed GR5J v2.0
Sum of mean annual IGF (m3/s) IGF sign
negative positive
- Structure 1: most of the water that is released to the groundwater is never recovered somewhere else.
- Structure 2: enables to nearly close the water balance for one of the two calibration periods.
- New constraints have to be found on the model structure and calibration in order to reinforce this spatial consistency.
- The two model structures give totally different maps of intercatchment groundwater flows.
- Structure 1: most of the catchments are leaking.
- Structure 2: leakage concerns mostly upstream
catchments whereas downstream catchments are gaining water (spatial consistency).
Model structure 1
Model structure 2
The semi-distributed model GRSD is based on an implementation of a lumped daily GR5J model (5 parameters) on each subcatchment. GR5J is composed of two stores: a production store (capacity X1) and a routing store (capacity X3), which is filled by the output of a unit hydrograph (of time base X4). Two other parameters, X2 and X5, are used to quantify the IGF. Outflow simulations of upstream catchments are routed downstream using a streamflow celerity (parameter C).
Two model structures are modelling intercatchment groundwater flow
in a different way (figure le�):
Structure 1: Upstream simulations are directly routed downstream so they
are not considered in IGF.
Structure 2: Upstream simulations are filling the downstream routing
reservoir, so it can be included in IGF. *de Lavenne A., Thirel G., Andréassian V., Perrin C., Ramos M.-H.
Irstea, HBAN, Antony, France. *[email protected]
GRSD model structure
EGU General Assembly 2016 – 18-22 April 2016 – Vienna – EGU2016-11745
