www.usask.ca/water

Hydrological Large Scale Modelling

Model Setup and Evaluation over the Mackenzie River BasinGonzalo Sapriza, Vanessa Pedinotti, Howard Wheater

www.usask.ca/water

Mackenzie River Basin- AREA : 1.8e6 km2 (20 % of Canada)- Headwater-mouth : 4241 km- Lakes - 3 Deltas : (1) Peace-Athabasca

(2)Slave River (3) Mackenzie outlet- Wetlands - 75% cover by permafrost (*)- Climate:

- Temp -25 winter +25 summer- Rain 410 mm/y (6-8 months snow)- Evaporation : 230 mm/year (*)- Runoff : 180 mm/year (*)

(*) GEWEX 1994-2005

www.usask.ca/water

Conceptual model

WATER BALANCE ENERGY BALANCE

(phase change)

Cold RegionsStrong linkage

MESH

CLASS Land Surface model: 1D

WATROFF Runoff propagation (WATROUTE, PDMROF)

+

Spatial Distributed physically based model

=

www.usask.ca/water

(1) Model SetUp: Basin and River network delimitation

DEM Basin & RiverNTW

GreenKenue

Preprocess:- Resampling

- DEM corrections- Fill Sinks

Geobase 250:000 (50 m aprox.)

www.usask.ca/water

(2) Model Setup: Discretization (0.125x0.125~ 10 km) Zonification (parameters based on 8 LC)

BASIN & Rivers N

+

Land Cover CCRS2005

=

MODEL

www.usask.ca/water

(2) Model Setup: Discretization & Zonification &Boundary conditions

Flow Directions

~

Up-scalingheterogeneity GRU

Layer 1: 0.10 m

Layer 2: 0.25 m

Layer 3: 0.75 m

Layer 4: 3.0 m

Atmospheric BC

Heat flux = 0

www.usask.ca/water

Model Setup: Initial Conditions SpinUp :

a) Obtain spatial distribution of the Initial conditionsb) Climate forcing 2006: Same year repeated 5 year x 3 times =

15 yearc) Climate forcing : WFDEI (0.5x0.5 ~50km, 3hrs)d) Parameters based on literaturee) No Lakes, No wetlands, No reservoirs (fake class parameter

for these land cover types)

www.usask.ca/water

Spin Up: Evaporation

(1) (2)

(3)

**Integrated values Spt. Avg.

*Units: mm/day

www.usask.ca/water

Spin Up: Soil Liquid Content 1st layer

(1) (2)

(3)

**Integrated values Spt. Avg.

*Units: mm/day

www.usask.ca/water

Spin Up: Runoff

(1) (2)

(3)

**Integrated values Spt. Avg.

*Units: mm/day

www.usask.ca/water

Spin Up: Ice Content 4th layer (3.75 m)

(1) (2)

(3)

**Integrated values Spt. Avg.

*Units: mm/day

www.usask.ca/water

Spin Up: Ice Content 4th layer

(units: mm/month)

www.usask.ca/water

Spin Up: Liquid Content 4th layer

(units: mm/month)

www.usask.ca/water

Spin Up: Ice Content 1th layer ( m)

(units: mm/month)

www.usask.ca/water

Spin Up: Liquid content 1th layer ( m)

(units: mm/month)

www.usask.ca/water

Spin Up: Runoff

(units: mm/month)

www.usask.ca/water

Spin Up: Evap

(units: mm/month)

www.usask.ca/water

Spin Up: Precipitation

(units: mm/month)

www.usask.ca/water

Model run 2002-2012 No Calibration parameter based on literature Initial conditions Spin-Up Climate driving WFDEI 3 hrs No Lakes process No wetlands process No reservoirs process

www.usask.ca/water

www.usask.ca/water

www.usask.ca/water

www.usask.ca/water

www.usask.ca/water

www.usask.ca/water

www.usask.ca/water

Next steps Select sub basins with different physiographic

characteristics:a) Reduce the computational cost (1 year sim = 1 day, No

parallelization of the code yet)b) Sensitivity analysis Which are the important parameters?c) Sensitivity of soil layers Permafrost, long memoryd) Relation between parameter and physiographic

characteristics of the basine) Incorporate remote sensing data

Precipitation uncertainty Incorporate Lakes, Wetlands, Reservoirs

www.usask.ca/water

PreselectedSubBasins

www.usask.ca/water

Hydrological Large Scale ModellingMackenzie River BasinConceptual model(1) Model SetUp: Basin and River network delimitation(2) Model Setup: Discretization (0.125x0.125~ 10 km) � Zonification (parameters based on 8 LC)(2) Model Setup: �Discretization & Zonification &Boundary conditionsModel Setup: Initial ConditionsSpin Up: EvaporationSpin Up: Soil Liquid Content 1st layerSpin Up: RunoffSpin Up: Ice Content 4th layer (3.75 m)Spin Up: Ice Content 4th layerSpin Up: Liquid Content 4th layerSpin Up: Ice Content 1th layer ( m)Spin Up: Liquid content 1th layer ( m)Spin Up: RunoffSpin Up: EvapSpin Up: PrecipitationModel run 2002-2012Slide Number 20Slide Number 21Slide Number 22Slide Number 23Slide Number 24Slide Number 25Next stepsPreselected�SubBasinsSlide Number 28