Data View, Branch: Catchments,
Category: Climate, Tabs: Precipitation, Temperature, Humidity, Wind, Melting
Point, Freezing Point, Latitude, Initial Snow. (These parameters apply to the Soil Moisture method. For the FAO Method, see FAO Method, Climate; for the MABIA Method, see MABIA, Climate.)
Depending on the setting in General: Basic Parameters, the values for all of these variables (except latitude) can either be entered once for each catchment and will apply to all the land use branches within that catchment, or they will be entered separately for each branch within each catchment. This second option might be necessary if there is a large variation in the elevation among different land uses within a catchment. Alternatively, the catchment could be divided into several different catchment nodes according to elevation, so that the climate within each catchment did not vary by land use.
The monthly precipitation time series can either be read in from a file or entered in manually.
The weighted mean of high and low temperature on a monthly basis.
The average monthly relative humidity.
The average monthly wind speed.
Fraction of daytime hours with no clouds (0.0=completely overcast, 1.0=no clouds). If blank, will default to 1 (no clouds).
The latitude in degrees.
The initial value for snow accumulation at the beginning of the first month of the simulation.
Liquid water threshold for snow melt (defaults to +5 degrees Celsius).
Solid water threshold for snow accumulation (defaults to -5 degrees Celsius).
Historic data of snow accumulation (snowpack), to be used in calibration. Measured in melt water equivalent (MWE) depth. For calibrating, see the "Snow Accumulation vs. Gauge" report, or use the PEST Calibration Wizard.
See also: Soil Moisture Method Calculation Algorithm
Entered on: Data View, Branch: Catchments,
Category: Climate, Tabs: Precipitation, Temperature, Humidity, Wind, Melting
Point, Freezing Point, Latitude, Initial Snow.