Post-bleaching boost multiplier for algae growth or capacity
Source:R/algae_components.R
getAlgaeBoost.RdComputes the multiplier that getAlgaeProduction() and
algae_dynamics_cc() apply to the baseline algae growth rate or carrying
capacity to represent a temporary post-bleaching boost in algal
productivity, as configured by the algae_boost, algae_growth_boost and
algae_capacity_boost arguments to setDegradation().
Arguments
- params
A MizerParams object
- t
The current time
- boost_vector
The boost vector to use –
algae_growth_boostoralgae_capacity_boostfromparams@other_params$algae. Element 1 gives the multiplier for the bleaching year itself, element 2 for one year post-bleaching, and so on. Iftis later than the last element ofboost_vector, the cumulative product stays fixed at the product of the whole vector (i.e. the boost plateaus rather than continuing to compound).
Value
A single number: 1 (no boost) if algae_boost is not TRUE,
boost_vector is empty, or t is before the bleaching year; otherwise
the cumulative product of boost_vector up to the current post-bleach
year.
Details
This is a pure function of t: it returns the cumulative product of
boost_vector up to the element for the current year post-bleaching,
applied fresh to the untouched baseline value every time it is called.
This mirrors how reefDegrade() recomputes refuge density fresh from the
baseline and deg_scale at every timestep, rather than by mutating
params: because a single mizer::project() call treats params as
read-only across the whole simulation (only n/n_pp/n_other are
threaded forward between timesteps), a rate function cannot rely on a
mutation to params persisting into the next timestep.