Australian Institute of Marine Science

Australian Institute of Marine Science

 
 

Copyright ©1996-2008

 
Sustainable coastal development
in northern Australia

"Science-based solutions for sustainable development"

Australia’s most northern coastline is considered Australia’s last frontier.
 
But that is about to change with major urban and industrial development planned. "Sustainable coastal development in northern Australia" is a new AIMS initiative developed to focus more research on Australia’s resource-rich and ecologically important Top End.

In collaboration with the Northern Territory Government, the research takes a proactive approach by striving to understand how the marine systems function ahead of major progress. This information will assist researchers and managers to forecast how the system will cope under the pressure of various developments, and to factor in preventative measures.

Sustainable coastal development team


Sustainable coastal development team
 

The main research focus is on the Northern Territory and includes the first detailed study of the Darwin Harbour.

Our Research

"The sustainable coastal development in northern Australia" team is made up of sediment experts, biologists, chemists and oceanographers. The team is equipped with skills specific to researching the impact of human activity on coastal waters. These researchers study water quality and ecosystem health and the movement of water and sediment.

The Darwin Harbour Project

It’s one of the finest harbours in Australia boasting an area seven times the size of Sydney Harbour encompassing roughly 1000 square kilometres of open water, with deep shipping channels. It’s the only port of any size along Australia’s northern coast and has ambitions to be Australia’s Asian gateway.

Monitoring sites have been set up


Monitoring sites have been set up throughout
the east and middle arms of the harbour.
(Image: Sue Codi)
 

The expansion of the shipping port, a gas pipeline and new gas plant, and large aquaculture development may add significant pressure on the harbour. The projected population growth for Darwin is significant, and with that comes increased nutrient load on the waterway.

The research team is taking a multi-faceted approach examining the physics, chemistry and biology of the harbour. For example, the status of water quality and sediment will be established. Fish communities and habitats will be surveyed in collaboration with the NT Government departments.

The nutrient content and concentration will be determined as well as the rate at which plankton and bacteria consume nutrients. The team is also investigating how the harbour is flushed out and the dynamics of sedimentation.

The project also studies fish communities and habitats in the Darwin Harbour. Fish biologists will examine the health of fisheries and how critical it is to a selected habitat.

AIMS began their studies on the Darwin Harbour in 2002, taking samples and establishing baseline data prior to work on major developments.

Scientists are working to pinpoint the sources of nutrients, the rate at which they’re being delivered into the system and the rate they are turning over or being absorbed.

Research is being conducted on the creeks in the Eastern arm of the harbour where there is considerable urban and industrial runoff.

The results will be compared with areas in the Western arm of the harbour where there is little or no development. Integrated chemical samplers called Semi-permeable membrane devices (SPMDs) measure the uptake of organics from the water column.

For example, the impact of petroleum hydrocarbons from bitumen road runoff, organophosphates from agricultural sources and sewerage effluent can be established.

Biological markers that have been developed in barramundi as part of the on going assessment of water quality for the GBR region is being applied in Darwin Harbour.

Scientists will sample the blood in juvenile male barramundi to see if sewerage effluent is having an impact on the production of hormones. There are concerns that estrogenic compounds may be having an impact on barramundi reproductive cycles.

Background on Biological markers or Biomarkers

One of the major tools for elucidating the exposure to, and effects of, environmental pollutants in the aquatic environment is the use of biological markers (biomarkers), which can be used as early warning signals of environmental degradation. These techniques can provide an inexpensive, rapid, and highly sensitive means of identifying and evaluating exposure of biota to environmental contaminants. The effects on the health of these organisms and the integrity of their ecosystem can also be determined.

Some examples of biological markers being used at AIMS to show exposure to chemicals in fish are:

  1. increase in enzyme production in the liver,
  2. a decrease or inhibition of enzyme production in the muscle, a change in the weight of the liver to the total body size of the fish, the production of metabolites into the gallbladder than indicate exposure and determination of hormones in the blood.

Modelling the hydrodynamics of the Harbour

An extensive oceanographic field study is being conducted to measure the movement of water and fine sediment in Darwin Harbour.

The study focuses on the flushing of the harbour as well as on the mixing of water amongst the three arms of the harbour.

Additional studies are currently being carried out at Fannie Bay to establish the cause of severe erosion at Mindil Beach, one of Darwin’s most popular beaches.

More information
Darwin Harbour - Water quality monitoring project 

River Research

There are several river systems under investigation- the Daly, Mary and Roper estuaries. This research entails field and modelling studies of natural processes and human induced changes in flushing and sedimentation of estuaries. It examines the consequent impacts on the ecosystems.

Daly River

The NT Government plans to convert pastoral leases in this region to agriculture. Prior to this development tit is crucial to understand the sediment dynamics of the system. Research will investigate the role of water flow (runoff, tidal bores) and potential impact of drawing water for irrigation. Current evidence suggests there has been considerable siltation since 1880. This project aims to provide the knowledge and information needed to manage future development of the Daly river basin.

This project will explore and monitor the impact of land clearing and water harvesting on the Daly system. This work is helping to explain why the estuary has silted considerably between 1885 and 2004, and to policies aimed at reducing siltation and its impacts.

AIMS project leader consults with traditional owners in the Daly River district to learn about their concerns.


Daly River Research:
AIMS project leader Eric Wolanski learns
more about rivers from traditional
owners and listens to their concerns.
 

China Project

This project looks at coastal water recycling in the rural Fujian province of China where human and agricultural pressures on waterways are taking their toll. AIMS has been enlisted to develop more efficient water recycling and fertilizer usage to minimize downstream estuarine and coastal pollution.

North West Shelf

In a world first AIMS and its co-investor Apache Energy are assessing the biological effects of effluent (containing nutrients and hydrocarbons called production formation water PFW) from the Harriet A platform on the Northwest Shelf. It’s the first time the impacts of effluent have been studied using a controlled caging study in a tropical marine ecosystem. The focus of the project is to assess biological exposure and possible impacts on stripey seaperch exposed to the effluent released into the water during oil production. Scientists will analyse enzyme levels in organisms to detect signs of stress. These fish can be used as an early warning signal of stress.

Sea Perch North West Shelf


Sea Perch
 


Natural gas fields, North West Shelf,
 Western
 Australia.
 

In most other developed coastal regions of Australia, management has focused on measuring environmental degradation and assessing the need for remedial measures. AIMS’ research endeavours to provide science-based solutions that will allow resource development and urban expansion without compromising the health of the environment.

Our Collaborators

This increased focus on northern Australia is about becoming fully acquainted with marine issues critical to Territorians. AIMS is collaborating with the NT Department of infrastructure, Planning and Environment, and consulting with all stakeholders, and custodians.

Collaborators

Northern Land Council (NLC),
NT Department of Business industry and regional Development,
Dept of Infrastructure, Planning and Environment,
Charles Darwin University,
UNESCO- International Hydrological Program),
AusIndustry,
Xiamen community (PR China),
Xiamen University,
Environment and Heritage.

Key Partners/Co-investors

Apache Energy,
Greenfields Resources Holdings and Pennington Seeds inc,
Westernhigh Pty Ltd,
Xiamen University,
Charles Darwin University,
Key Centre for Tropical Wetlands Management,
CSIRO

 

Burdekin River

 

Contact
Dr Eric Wolanski FTSE, Team Leader
Telephone: 07 47534243
Fax: 07 47725852
Email: e.wolanski@aims.gov.au 

 

 


December 2, 2004