MESH: A community model for EC
Alain Pietroniro, Bruce Davison, Brenda Toth, Jessika Toyra,
National Water Research Institute and Hydrometerology and
Arctic Lab
Environment Canada
Saskatoon, Saskatchewan
Vincent Fortin, Pierre Pellerin, Stephane Belair
RPN/CMC
Environment Canada
Dorval, Quebec
Diana Verseghy, Murray Mackay
Climate Research Division
Environment Canada
Dorval, Quebec
Eric Soulis, Frank Seglenieks, Nick Kouwen, Bryan Tolson
University of Waterloo
John Pomeroy, Pablo Dornes
University of Saskatchewan
Sub-basin contribution to flow
naturalized flow in current climate
Red Deer River
19.2%
Bow River
44.3%
11/24/2006
South Sask at
Diefenbaker
100%
Page 2
Oldman River
38%
Trends in the SSRB
• Mann Kendall (Burn)
-4.0937
-0.8225
-1.7046
-0.5020
-5.3060
-2.8822
-0.3209
-0.0190
-0.1582
SSRB
-0.3150
MK Trend Analysis
Decreasing Trend (Slope)
11/24/2006
Page 3
No Trend
South Saskatchewan basin
North Saskatchewan basin
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Page 4
10 year simulation
Oct, 1980 – Dec, 1990
Mistaya River
25
M
o
n
th
lyF
lo
w
(C
M
S
)
Glacier at 1975 extents
20
15
10
5
0
8/1/80
12/1/83
M
o
n
th
lyF
lo
w
(C
M
S
)
4/1/87
8/1/90
Time (month)
50
Siffleur River
40
30
20
10
0
8/1/80
12/1/83
M
o
n
th
lyF
lo
w
(C
M
S
)
4/1/87
8/1/90
Time (month)
100
Ram River
80
60
40
20
0
8/1/80
11/24/2006
12/1/83
Page
5
Time
4/1/87
(month)
8/1/90
From Measurements to Models
Resolution
1m
Tile/HRU
Point
Prediction
Terrestrial
Open Water
Snow and Ice
Parametrization
Terrestrial
Open Water
Snow and Ice
Process
Terrestrial
Open Water
Snow and Ice
MODELS
11/24/2006
100 m
Landscape type
Tile/HRU
Hillslope
100 m - 2 km
Pattern/tile
Grid/small basin
Sub-basin
2 - 10 km
10 km -
Multi-grid/medium basin Multi-grid
Basin
Mesoscale
10 km
Regional;
Previous LSS Scaling Methodology
IP3 Scaling Methodology
MESH
CHRM
CHRM
CHRM
CEOP Hydrology
Quinton CFCAS Study--------------->
MESH
MESH
MESH
CHRM
CEOP Hydrology
<----------------------------------MAGS
Modelling and parameterization hierarchy. Previous LSS
scaling methodology refers to projects that parameterized
and evaluated predictions of processes at a point and then
applied directly to regional scales.
IP3 scaling methodology
Page 6
involves step-wise transfer of upscaled processes to basinscale parameterizations and then to regional scales
Research Basin
Havikpak Creek,
taiga woodland
Trail Valley
Creek, arctic
tundra
Baker Creek,
Subarctic shield lakes
Wolf Creek,
subarctic tundra
cordillera
Scotty Creek,
permafrost wetlands
Peyto Creek,
glacierized alpine
Lake O’Hara,
wet alpine
11/24/2006
Marmot Creek,
subalpine forest
Page 7
MESH: A MEC surface/hydrology
configuration designed for regional
hydrological modeling
• Designed for a regular
grid at a 1-15 km
resolution
• Each grid divided into
grouped response
units (GRU or tiles) to
deal with subgrid
hetereogeneity
– based on
WATFLOOD
• 11/24/2006
Scalable ?
Sub-grid
Hetereogeneity
(land cover,
soil type, slope,
aspect, altitude)
B C C C A
C B B A A
D C B C C
D C B B C
D D D D B
A relatively small
number of classes
are kept, only the %
of coverage for
each class is kept
Page 8
A
B
C
D
Improved Soil Water Balance
CLASS 2.7 Model
Surface
Excess
θ1
θ2
MESH (class 3.2)
θ1
Surface R
unoff
θ2
Interflow
slope
θ3
θ3
Drainage
11/24/2006
Drainage
Page 9
MESH: A MEC surface/hydrology configuration
designed for regional hydrological modeling
• The tile connector
(1D, scalable) redistributes
mass and energy between
tiles in a grid cell
Tile
connector
– e.g. snow drift
• The grid connector (2D) is
responsible for routing
runoff
– can still be parallelized by
grouping grid cells by
subwatershed
11/24/2006
Grid
connector
Page 10
WATROUTE
Channel flow only
Low storage & smooth
Channel + overbank flow
high storage & rough
Drainage Area vs. Bankfull Area
Bankfull Area in m^2
6
11/24/2006
5
4
3
2
1
0
0
50
100
Page 11
150
Drainage Area in Km^2
200
250
300
Mode = “i”
- one channel inflow file
Model
Output
Runoff
(yyyymmdd_rff.r2c)
bs
11/24/2006
Page 12
cs
Mode = “l”
runoff file + leakage file
(inflows added)
ss
+
uzs
Runoff
(yyyymmdd_rff.r2c)
lzs
11/24/2006
Leakage
Page 13
bs
(yyyymmdd_lkg.r2c)
cs
Mode = “r”
runoff file + recharge file (sr added to routed recharge)
ss
+
Runoff
uzs
(yyyymmdd_rff.r2c)
Recharge
(yyyymmdd_rch.r2c)
lzs
bs
11/24/2006
Leakage
cs
Page 14
(computed in WATROUTE)
Modeling strategy
• Incorporate result of diagnostic modelling (CHRM, others)
• Sensitivity of new physics into MESH ?
– Major flux boundaries (ET, streamflow)
• Test parameterization
– Multi-objective ?
• Basin segmentation ?
– Forcings ?
– Physics ?
– Parameters ?
• Is the GRU scalable ?
11/24/2006
Page 15
Trail Valley
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Page 16
IPY
IP3
DRI
GLEI
11/24/2006
Page 17
Map created by Jackie Bronson
11/24/2006
Page 18