IBM — Individual Based Module

An IBM (Individual Based Model) for biological behaviour or similar can be added to LADiM. As they may be very different, it is difficult to be general enough.

The IBM variables are named by the configuration, and some get initial values in the particle release. The rest must be initialized. [This is not done properly yet, age = 0 initially so lakselus is OK, need perhaps an append method, to be called by state.append]

Requirements for an IBM module:

class IBM.IBM(config)

update_ibm(self, grid, state, forcing)

This method is supposed be called from the State.update() method.

IBM support utilities

A light module is available as ladim.ibms.light, that can be used to compute the surface light (without clouds). This is useful for modelling diel vertical migration for many species. The module is based on the paper by A. Skartveit & J.A. Olseth (1988). It is given as a function:

IBM.surface_light(dtime, lon, lat)

Parameters:

• dtime (numpy.datetime64) – Time
• lon (float) – Longitude [degrees]
• lat (float) – Latitude [degrees]