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More information
Darwin Harbour
Water quality monitoring
project
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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
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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.
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Monitoring sites have been set up throughout
the east and middle arms of the harbour.
(Image: Sue Codi)
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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.
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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.
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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.
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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:
- increase in enzyme production in the
liver,
- 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.
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Modelling the hydrodynamics of the Harbour
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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 |
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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.
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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.
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Daly River Research:
AIMS project leader Eric Wolanski
learns
more about rivers from traditional
owners and listens to
their concerns.
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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.
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.
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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 |

Contact
Dr Eric
Wolanski FTSE,
Team Leader
Telephone:
07 47534243
Fax: 07 47725852
Email: e.wolanski@aims.gov.au
December 2, 2004
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