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Modelling Objectives for WATFLOOD
- Flood forecasting and flood studies
- Climate change impact studies
- Environmental impact studies
- Continuous modelling
- Ability to model very large as well as small areas
- Ability to optimally use gridded data sources e.g.. Land cover,
DEMs, NWP model output, Radar data
- Universally applicable parameter set
- Quick turn around
- Ability to model a wide variety of landscapes
WATFLOOD Features
- Grouped response units (GRUs): leads to universal parameter set
because parameters are associated with land cover and NOT watersheds
- Gridded model:
- Optimal use of remotely sensed data
- Optimal use of numerical weather data
- Optimal use of RADAR precipitation data
- Optimal use of 1,2 and 3D display facilities (e.g.
GREEN_KENUE)
- The combination of GRUs and grids make the effective resolution
much greater than the grid size used.
- GREEN_KENUE (ENSIM)
pre & post processor
- Source tracing
- Grids < 1 km
- Meta-data on all files
Modularity
- Shell program for modelling sub-units
- Separate programming units for transport processes model, snow melt
water quality, wetland coupling and sediment production and routing.
- Domain configuration for modelling.
- Event generation
- Point data to distributed data conversion for meteorological inputs
(these can be replaced by users).
- Output visualization (e.g. Ensim, Grapher, Surfer, Excel, etc.)
- Statistical analysis of output.
- Interfacing with other models
- Gridded model allows 1 to 1 matching of runoff units to
meteorological driving data from NWM
- Gridded surface model allows 1 to 1 matching of recharge to
groundwater model such as MODFLOW
- Computed river inflows can be accumulated on a reach by reach basis
for input to an internal Lake routing module or be written to a file in
a format compatible with routing models such as DWOPER
or FLOW-1D
- Grid outflow (runoff) computed with any model can be routed with
WATROUTE (a subset of WATFLOOD Code)
Scaling/Domain Size
- WATFLOOD has been used with grid sizes from 1 to 25 km and for
watershed areas from 15 to 1,700,000 km^2
- WATFLOOD is not sensitive to grid size as long as there are a
sufficient number of grids to maintain the integrity of the drainage
system and preserve the variability in the meteorological data
Regional model: models multiple watersheds (cannot properly calibrate
model with one or two flow stations)
Hydrological Features
- 4 zone model:
- surface
- upper zone (saturated, varying depth) (UZS)
- unsaturated zone (API dependent soil moisture not part of the
water balance)
- saturated lower zone (LZS)
- Hargreaves, Priestley-Taylor or climatic evaporation
- Green-Ampt infiltration, Hortonian runoff model
- Andersons snow model with cover based snow cover depletion curves
- Hartly sediment model
- Glacier melt (crude)
Routing Features
- Storage routing (center difference KW solution with variable time
steps to satisfy Courant criteria everywhere)
- Coupled lower zone-wetland-stream routing model
- Coupled lower zone-prairie coulee-stream routing model
- Lake routing, reservoir operating rules (diversions)
- Overbank flow (with different resistance coefficients)
- River, Lake and groundwater initialization based on recession curve
of observed hydrographs.
- Nudging: computed flows at flow stations can be replaced by observed
flows.
- Tracer model - ground water flow contribution in the hydrograph
Water Quality Modelling
- Upland sediment production model: supply or transport limiting
- Nitrate and Phosphate production models (based on AGNEPS but done
hourly)
- Mixing cell sediment and nutrient routing
- For details: downloads/leon_thesis_pdf.zip
Adaption
- On the fly updating of snow pack
- On the fly updating of land cover (coming soon)
- Precip. smearing (convert 24 hr. precip. to a shorter flat
distribution)
- Precipitation Adjustment Factors (PAF) (to correct for bias in
precip. Data)
- Unsaturated zone updating using API
Special Features
- Interfaced with ENSIM-HYDROLOGIC
- Chaining events a continuous run of individual events
- Automatic soil moisture initialization for flood forecasting
- Grid shifting for ensemble forecasting
- Forecast mode for training purposes
- Hooke & Jeeves pattern search optimization
- Stage output for flood warning
Future Additions
- Automatic generation of all required files for a new watershed
including sample .rag, .snw, .str, & .rel files
- Source tracing
- Grids < 1 km
- Meta-data on all files
- Autoclose windows
- Additional outputs for .wfo file
- Prairie slough model
- Lake evaporation model
- Frozen soil model
- Rainforest model
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