Using Nalu

A model run takes a location, a date, and a selection of variables.

Running a model

Set the reef location in the location selector.
Set the reference date, for example 09/03/2025.
Enter the environmental and biological variables, or upload an existing dataset.
Tick the variables the run should include.
Set Use New Model according to the modelling method required.
Select Generate.

Input	Detail
Location	Selects and edits the reef being modelled. Used to give context to the environmental parameters
Date	Sets the reference date for the model

Variable	Meaning
Temperature	Sea surface or water column temperature
Salinity	Salt concentration of the water
Water Turbidity	Clarity of the water
Water Current	Speed and direction of water movement
Sedimentation	Level of sediment deposition on the reef

Variable	Meaning
Coral Disease Species	The pathogen or disease type being modelled
Drupella Density	Population density of Drupella, a corallivorous snail that stresses coral
Parrotfish Density	Density of parrotfish, which graze algae
Butterflyfish Density	Density of butterflyfish, an indicator of reef health
Total Coral Cover	Percentage of the reef area covered by coral
Coral Density	Number of coral colonies per unit area

Control	Effect
Variable checkboxes	Select which variables the run includes
Use New Model	Switches between modelling methods
Generate	Runs the predictive analysis over the current inputs

Generate produces a prediction of coral disease spread for the location and period supplied. The prediction is rendered in the browser.

The output includes a predicted growth rate or spread area, a risk assessment for the location and period, and a visual or tabular summary.