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Section 1: Forcing Data Description
Hydrological Model
CHM (Canadian Hydrological Model)
Required Data
1. total precipitation [kg m-2]
2. air temperature [oC]
3. humidity [%]
4. wind [m s-1]
5. wind direction [deg]
6. incoming shortwave radiation [W m-2]
7. optionally, longwave [W m-2]
Data Sources
Station (ECCC & Provinces)
● CaPA + GEM (from ECCC)
Spatial Resolution
Flexible spatial; Point/HRU scale
Temporal Resolution
Sub-daily, ideally hourly or less
File Format
● Input is .nc in lat/long grid with time
● Timeseries per station stored in flat ASCII
Section 2: Features
Strengths and Limitations
● Requires constant meteorological forcing data timesteps
External and Internal Tools
● Python (xarray/pandas or R (dplyr) used to convert existing met data to CHM format.
● WindMapper generates wind speedup maps for spatial interpolation of wind (python)
● Modules exist to spatially interpolate the point data using lapse rate methods
Source Code Availability