Coastal Monitoring

Central Coast Council is continually improving the way we monitor our dynamic stretch of coastline to better understand the natural coastal processes, improve our management, reduce risk to the community from coastal hazards and identify new coastal issues or beach changes.  

Our beaches are one of the region’s most valued assets and provide significant social, environmental and economic benefits to residents, businesses and visitors alike. They are, however, also exposed to a range of coastal hazards and the Central Coast Local Government Area has one of the highest risk exposures to coastal erosion in New South Wales.

Council uses a variety of data collection methods including aerial drones, traditional beach surveys, satellite imagery, fixed cameras networks and citizen science initiatives. Council uses these methods to capture and monitor changes in shoreline positions, beach volumes, slope and cliff instability and dune vegetation over time and following severe weather events. At the entrances to our Intermittently Closed and Open Lakes or Lagoons (ICOLLs), we also monitor sand berm levels, shoaling and channel configurations to assist in managing the entrances in accordance with their relevant plans.

Drone Monitoring

Council uses specialised mapping drones to monitor beach and estuary entrance dynamics, wetlands and foreshores at a very high spatial resolution enabling detection of even small changes in these environments.  Mapping drones use high precision RTK GPS resulting in positioning accuracies of 2-3cm.  Drones supplement spatial data from other sources such as aerial & satellite imagery, fixed shoreline and entrance monitoring cameras and longer-term beach monitoring programs such as the NSW Beach Profile database.

Here’s an example of a drone footage recorded at Soldiers Beach during a survey of the construction of the replacement northern beach access stairs and vehicle access ramp in June 2024. 

ICOLL Entrance Monitoring

Council has a responsibility to manage flood risk and accordingly manages the entrances of our Intermittently Closed and Open Lakes and Lagoons (ICOLLs) to reduce the risk of flooding and associated impacts on the community.
 

Council has installed new solar-powered and wireless camera platforms to remotely monitor the environmental conditions and channel states at these entrances to ensure staff always have up-to-date information. This information is vital for effective management as ICOLL entrances are extremely dynamic and the sand barriers and channel compartments are constantly shaped by catchment and coastal processes.   
 

These advanced cameras support a network of water level and rainfall gauges and progressive Flood Intelligence Tools that can model predicted flood levels in near real-time, to ensure Council remains prepared, informed and ready to intervene when the relevant trigger levels are met. 
 

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Emergency Response Beacons (ERBs)

A number of Emergency Response Beacons (ERBs) have been installed at high risk drowning locations on the Central Coast by Surf Life Saving New South Wales. 

An Emergency Response Beacon, or ERB, is an autonomous emergency response tool being rolled out at identified ‘black spot’ locations across the state to assist in lifesaving activities and improve beach safety. 

The ERBs use the latest mobile technology to, when engaged by a person on the beach, communicate between the Surf Life Saving NSW State Operations Centre (SOC) and the person, allowing the SOC operator to quickly gather important information, issue instructions or provide reassurance in an emergency situation. Their use can dramatically reduce response time at unpatrolled and isolated beach locations.  
https://www.surflifesaving.com.au/emergency-response-beacons/ 
 

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Satellite Imagery

Satellite imagery is a powerful tool that allows Council to monitor our coast at a more regional scale without the need for intensive field surveys. 

One example of how satellite imagery is used is that we can extract shoreline positions along our beaches by identifying the boundary between water and sand in the images. This shoreline information can then be compared across different points in time to quickly assess impacts from severe weather events, to identify beaches with low sand volumes that may be at an increased risk of coastal erosion or observe longer term changes. 

Thanks to a free online tool developed by Geoscience Australia’s Digital Earth Australia (DEA) Program, you can also explore Australia’s dynamic coastline and see how this looks like first hand. 

The timelapse below, created using satellite images taken between 2016 and 2024, provides a snapshot of how dynamic the entrance to Tuggerah Lakes is and how it changes over time in response to prevailing coastal and catchment processes. 

In this timelapse, you can observe how dynamic our beaches are as satellite images shows North Entrance Beach fluctuating and changing in response to coastal processes.  

What is CoastSnap?

CoastSnap is a global citizen science project to capture our changing coastlines. No matter where you are in the world, if you have a smartphone and an interest in the coast, we welcome you to participate!

The more photos we have of a particular site, the better our understanding becomes of how that coastline is changing over time. 

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