Australia's top models at science conference

July 13, 2009

Australia's top models will take centre stage in Cairns this week as scientists meet to discuss ways to understand climate change, improve air safety and enhance agricultural sustainability.

The IMACS/MODSIM Congress will attract more than 650 experts in modelling and simulation from Australia and overseas to the Cairns Convention Centre from July 13-17, 2009.

CSIRO Mathematical and Information Sciences chief and Congress speaker Dr Louise Ryan said mathematical models are ways of describing the actions of very complex natural and man-made systems by quantifying how their key components interact.

"Take a simple food chain we might learn about at school - plankton are eaten by small fish, who are eaten by bigger fish like tuna which are caught for our dinner," Dr Ryan said.

"In a real ecosystem, hundreds or even thousands of species interact - and not just as predators and prey.

"In the US, I worked on a model of how mercury from coal-fired power stations moves through a real food chain - from its release into the atmosphere and then into the water where it's absorbed by plankton and all the way through to humans.

"By painting a detailed mathematical picture of how different parts of the system affect each other, the model could predict what would happen to peoples' mercury levels, for example, if emissions levels were reduced in a nearby power plant."

Other top models at the conference include: Dr Ryan said that a good computer model of a complex ecosystem might be build on decades worth of data and expert knowledge about the underlying biological or physical system.

"The better the data a model is based on, the more reliable it is at predicting changes and guiding real decisions. No model is perfect, but it doesn't need to be to do a good job of predicting. Knowing how complicated a model needs to be is where the art of modelling lies" she said.

Co-Chair of IMACS/MODSIM ANU Professor Tony Jakeman said the conference is attracting a wide range of scientists who use modelling and simulation, such as hydrologists, physicists, climate scientists, economists and other social scientists, statisticians, image analysts, and software engineers.

"What we learn from one area is often applicable in another," Professor Jakeman said.

"The underlying maths can be almost the same. Conferences like this are a great opportunity to find out what others are doing and get some new ideas to discuss and try out. That's how science moves forward" he said.
The conference sponsors include CSIRO, the Queensland and Victorian governments, Griffith University, the Australian Mathematical Sciences Institute and the eWater CRC.

Image available at:

Further Information:

Dr Louise Ryan,
CSIRO Mathematical and Information Sciences
Mb: 0428 116 077

Prof Tony Jakeman,
Conference Co-Chair
Mb: 0404 851 689

Background information available at:

Media Assistance:
Fiona Henderson,
CSIRO Land and Water
Mb: 0419 118 027

Carrie Bengston,
CSIRO Mathematical and Information Sciences
Mb: 0417 266 190

CSIRO Australia

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