This file controls the simulation time period and time step.
Field
Description
Type
Beginning day of the simulation
integer
Beginning year of the simulation
integer
day_end
Ending day of the simulation
SWAT+ is able to end a simulation at any day of the year. This option can for example be useful, if the user wishes to simulate hydrological years instead of calendar years.
If day_end = 0, the model will end the simulation on December 31st.
If the simulation begins before the first day of the observed climate data, SWAT+ will use simulated climate data for the time period before the start of the observed climate data.
yrc_end
Ending year of the simulation
If the simulation ends after the last day of the observed climate data, SWAT+ will use simulated climate data for the time period after the end of the observed climate data.
If the simulation begins before the first day of the observed climate data, SWAT+ will use simulated climate data for the time period before the start of the observed climate data.
day_start
Beginning day of the simulation
SWAT+ is able to begin a simulation at any day of the year. This option can for example be useful, if the user wishes to simulate hydrological years instead of calendar years.
If day_start = 0, the model will start the simulation on January 1st.
If the simulation begins before the first day of the observed climate data, SWAT+ will use simulated climate data for the time period before the start of the observed climate data.
step
Time step of the simulation
SWAT+ is able to run at the following time steps:
Code
Time Step
0
day
2
12 hours
24
hour
When using the Green & Ampt method ( in ) for calculating surface runoff, the time step of the precipitation data must match the simulation time step.