Numerical/mathematical/computer models use one or more mathematical equations to simulate the behaviour of real systems under a wide range of conditions.
Why use a model?
Models have a wide range of applications and benefits, some of which are outlined below.
- Numerical models can be used to make predictions about the outcomes of a particular mangement scenario, for example, determining potential impacts of different types of landuse on a range of environmental aspects, such as water quality, for a set period of time;
- They can also be used in hindsight, to assess the effectiveness of management actions and to evaluate the influence of natural factors on the environment, such as climate change;
- Numerical models can be used to assist setting water quality objectives as well as assessing their effectiveness. The publication Targets, Data and Models: Catchword. Issue 127. May 2004 has more information about using models for setting and assessing water quality objectives (Note: WQOs are referred to as ‘targets’ in this document);
- Modelling helps users to develop an understanding of physical and biological processes in their waterways; and
- Models can assist users in developing management plans for their waterway.
Choosing a model
Click on an water quality issue to find existing modelling tools available for that water quality issue.
 Freshwater flow regime |
 Hydrodynamics |
 Suspended sediments |
 Nutrients |
 Organic matter |
 Toxicants |
 Bacteria/pathogens |
 pH |
 Water temperature |
 Litter |
 Excess salt (hypersalinity) |
 Excess freshwater (hyposalinity) |
 Habitat removal/disturbance |
 Biota removal/disturbance |
 Pests |
