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In CRiSP.1, fish move both spatially and temporally. A distribution of fish over time is typically represented by an array whose index is some unit of time. There are several different time scales and references used throughout the model.
DAYS_IN_SEASON (365 days)
- This is the number of days in the model season, beginning with the Julian day specified by SEASON_START_DAY.
STEPS_PER_DAY (2 steps/day)
- This is the number of system time steps per day. It is the resolution (12 hours) of time-based calculations for reach segments.
STEPS_IN_SEASON (730 steps)
- Total number of system time steps DAYS_IN_SEASON * STEPS_PER_DAY
DAYS_IN_RUN (365 days)
- The number of days for which a given release of fish remains in the system before becoming censored.
STEPS_IN_RUN (730 steps)
- The number of system steps during which a given release of fish is in the system. (DAYS_IN_SEASON * STEPS_IN_RUN)
DAM_TIME_SLC (12 steps/day)
- This is the number of dam time slices per day. It is the resolution (2 hours) of time-based calculations for dam segments.
SLICES_IN_STEP (6 steps)
- This defines the number of dam time slices in a system time step.
(DAM_TIME_SLC / STEPS_PER_DAY)
SEASON_START_DAY (0)
- This defines the Julian day of the season start (in this case, December 31st).
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Columbia River Salmon Passage Model CRiSP.1.5 User Manual
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