South Saskatchewan River Basin Integrated Hydrologic Model
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Transcript of South Saskatchewan River Basin Integrated Hydrologic Model
South Saskatchewan River Basin Integrated Hydrologic Model:Year 2 Progress Synopsis
Nested Basin Approach• Large river basin models strain the limits of current
computing power.• Improved spatial resolution is realized by generating
smaller models of higher resolution.
Hierarchy of Spatial Scale
Overview• 3-D geological model constructed.• Physical properties applied to land surface and subsurface.• Average monthly climate conditions 2009-2013 applied to date.• Major hydrological processes implemented include: precipitation,
evapotranspiration, snow accumulation, snow melt, overland and subsurface flow.
• Outputs include soil moisture saturation, groundwater levels, stream flow, and snow accumulation.
A Suite of Hydrological Outputs
Flood Risk and Mitigation
Work in Progress• Input of daily climate data.• Irrigation simulation.• Reservoir operations simulation.• Field scale simulations.• Assimilation of measured data (calibration).
South Saskatchewan River Basin (SSRB) location map showing the Oldman River Basin (ORB), Bow River Basin (BRB), Red Deer River Basin (RDRB), and the Lower South Saskatchewan River Basin (LSSRB).
Red Deer River Basin
• soil moisture
Oldman River Basin
• depth to groundwater
Winter Processes• Snow accumulation and melt• Frozen ground
Sub-basin Model Construction
Hydrological Risk to Pasture
HGS simulations for evaluating flood mitigation strategies.
Modeled using high melting rate Modelled using low melting rateObserved conditions from satellite
High resolution finite element models were generated for the four major sub-basins: (1) Red Deer River, (2) Bow River, (3) Oldman River, and (4) Lower South Saskatchewan River. Snow accumulation and melt model will be calibrated using remotely sensed snow cover data and point
source snow survey measurements. Snow cover in blue and bare ground in brown.
ReferencesAllen, R.G., L.S. Pereira, D. Raes and M. Smith. 1998. Crop evapotranspiration - guidelines for computing crop water requirements. FAO Irrigation and Drainage Paper No. 56, Rome, Italy.
Major River
Basin
~100,000’s km2
Sub-basin
~10,000’s km2
Regional Scale
~100-1000’s km2
Field – Soil
Column Scale
~1 km2
The SSRB HGS model is actually a set of models at varying scales.
Evapotranspiration (ET)
Location of DYMAC pasture growth study sites (green squares), AAF pasture growth study sites (blue circles) and irrigation districts (pink polygons).
• Solar radiation-based potential ET.• Dual crop coefficient approach for
evaporation and transpiration.• Includes root water uptake adjusted
for soil moisture.
Crop coefficient curves showing the basal (Kcb), soil evaporation (Ke), and single crop coefficient (Kc) (after Allen et al., 1998).
• Correlate hydrologic conditions to pasture yield.
• Improve production resiliency under variable climate (flood/drought).
HGS simulations for assessing local flood risk in Medicine Hat, AB.