Prominent Malaysian developer <a href="https://www.apartments.com.au/developers/osk-property">OSK Property</a> has unveiled <a href="https://www.apartments.com.au/new-apartments/aura-at-melbourne-square-7-hoff-boulevard-southbank-vic-3006">Aura</a>, the next stage of its $3.5 billion Melbourne Square precinct in Southbank, continuing its push into wellness-led, amenity-rich apartment living.

The $800 million tower, planned for 7 Hoff Boulevard, will rise 67 storeys and deliver 673 apartments, with COX Architecture drawing on both Japanese design principles and Australia’s natural landscape to shape the building’s identity. A rectangular grid aesthetic defines the building’s exterior, with COX drawing design cues from New York high-rises and Tokyo’s skyline.

Aura builds on a growing trend in high-density living, where wellness is no longer an add-on but central to the product. The development is structured around four key pillars, combining calm, minimalist residences with layered communal spaces, landscaped gardens, and a suite of wellness amenities designed to support both physical and mental wellbeing.

[smartcode_project:default project_id=151921 project_image_fid=367465]

At the core of the project is what OSK describes as a vertical wellness ecosystem, a multi-level approach to amenity that integrates health, lifestyle, and social spaces throughout the building rather than confining them to a single level.

The main resident hub, the Aura Club on level seven, will include a pool, cold plunge, spa, gym, Pilates and yoga studios, alongside more lifestyle-driven inclusions like a golf simulator, music rooms, library, and work-from-home spaces. Above, a series of higher-level amenity zones, including the Meridian Club and Cumulus Club, introduce more refined, social and retreat-style environments, with private dining, lounges, and premium wellness spaces positioned to take advantage of city views.

[smartcode_project:default project_id=151921 project_image_fid=367467]

The residences themselves will largely include balconies, a key design move in a market increasingly focused on natural light, airflow, and connection to the outdoors. Views will extend across the CBD, the Arts Precinct, Royal Botanic Gardens, and beyond.

Aura also introduces approximately 1,600 sqm of retail across the lower levels, further activating the Melbourne Square precinct, which already includes Kennedy Park, a Woolworths, childcare, and a growing mix of hospitality operators.

[smartcode_project:default project_id=151921 project_image_fid=367474]

“Aura stands tall as an exemplar of holistic wellness – its focus on social, physical and mental health culminate in a building that is calming, restorative and relaxing, where residents will have their own sanctuary within the well-connected and sought-after <a href="https://www.apartments.com.au/developments/southbank-vic-3006">Southbank</a>," says&nbsp;OSK Property CEO Chong Boon Woon.

“We have been very encouraged by the market’s response to the BLVD offering, and we know there is a strong demand for the level of amenity, service and design that the Melbourne Square precinct is known for.

“Complemented by work-from-home lounges for professionals, family friendly outdoor garden spaces, and state-of-the-art fitness and wellness facilities, Aura will continue our focus on maximising physical, emotional, and mental wellbeing,” he said.&nbsp;

[smartcode_project:default project_id=151921 project_image_fid=367475]

The project follows the strong performance of BLVD, which is now around 80 per cent sold, and reinforces OSK Property’s long-term commitment to Melbourne Square as a fully integrated, mixed-use precinct.

Construction is expected to commence in late 2026.

[smartcode_project_cta:default project_id=151921]

Joel Robinson

OSK unveils AURA, the latest stage in Southbank's $3.5 billion Melbourne Square precinct

National developer Time &amp; Place appears to have settled on a design for its long-anticipated Potts Point project.

After several years of back and forth with local council and the NSW Government, the developer, which has spent close to a decade targeting the former The Chimes site on Macleay Street, has now progressed its plans.

Following a concept design submission last year by SJB, Time &amp; Place has lodged a full State Significant Development Application with the NSW Government, this time for a scheme designed by Kerry Hill Architects.

<img alt="Time &amp; Place" data-entity-type="file" data-entity-uuid="504d2a27-d65f-4227-8189-1e35e3376e62" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-20%20at%209.38.24%E2%80%AFAM.png?VersionId=_XqFKATYHF30KnVByPxhaI9UBzmkmfn7" />

The 16-storey proposal includes 44 apartments, 21 of which will be build-to-sell. These will comprise 19 three-bedroom apartments and two four-bedroom penthouses.

More than 50 per cent of the development will be dedicated to affordable housing, with 23 one- and two-bedroom apartments delivered in line with the NSW Government’s Housing SEPP.

Kerry Hill Architects said the proposal is driven by a strong response to place.

“Our proposal for a new residential building for Potts Point in Sydney is driven by a deep consideration of place,” the practice said in its submission.

“This operates on multiple levels, including a landscape approach that reinstates endemic flora of the Sydney peninsula and provides a ground-floor garden for residents, reconnecting the site to its pre-European history. A brick podium further strengthens this relationship to context, integrating planting and fine bronze detailing that references the predominant material language of Macleay Street.”

The three-level podium will be topped by a communal resident space, featuring a covered pool designed to receive direct afternoon sun in winter, a neighbouring reflection pool, dining and event areas oriented to maximise sunset views, and an outdoor exercise zone.

<img alt="Time &amp; Place" data-entity-type="file" data-entity-uuid="8d3eedc1-babb-44a3-bd96-d8a42f3adf1f" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-20%20at%209.37.48%E2%80%AFAM.png?VersionId=Ii7.4dvqNatu5GQi6bhqNjAswrMB998." />

The design also incorporates highly crafted shopfronts and a clearly defined residential entry to activate the street. Juliette balconies to the podium residences will provide passive surveillance and a strong sense of habitation.

Above, the larger apartments are housed within a light-coloured masonry and bronze tower.

“The tower steps back in a series of gently curved volumes that reference the rich Art Deco context of Macleay Street,” the architects said. “Carefully calibrated vertical fins frame the views while providing privacy and a sense of refuge.”

<img alt="Time &amp; Place" data-entity-type="file" data-entity-uuid="6fab60f4-3140-4469-b47a-48c781e0a30b" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-20%20at%209.28.44%E2%80%AFAM.png?VersionId=e5XxrM3kzdASdKlcIACHAHbOSZhSKC9O" />

Time &amp; Place has been one of the most active developers nationally in the last 12 to 24 months. Late last year they completed&nbsp;The Queensbridge in&nbsp;<a href="https://www.apartments.com.au/developments/southbank-vic-3006">Southbank</a>, a mixed-use tower with 353 apartments and a hotel. They are currently selling Park Modern, 246 apartments near the famous Botanic Gardens in South Melbourne.

The developer has approval for The Burke, a mixed-use project in&nbsp;<a href="https://www.apartments.com.au/new-apartments/glen-iris-vic-3146">Glen Iris</a>&nbsp;being delivered in partnership with Woolworths. The 60 apartments, positioned above a new Woolworths supermarket, are expected to launch in the coming months. Time &amp; Place is also progressing plans for the redevelopment of&nbsp;<a href="https://www.apartments.com.au/developments/northcote-vic-3070">Northcote</a>&nbsp;Plaza, and have recently submitted plans for a <a href="https://www.apartments.com.au/news/vic/time-place-unveils-plans-22-storey-south-melbourne-tower">22-storey tower</a>, another in South Melbourne.

In&nbsp;<a href="https://www.apartments.com.au/developments/sydney-nsw">Sydney</a>, the developer has two projects in Manly: Two Tides, which is currently under construction, and an ultra high-end building on&nbsp;<a href="https://www.apartments.com.au/buildings/shoreline-manly-beach-89-90-north-steyne-manly">North Steyne</a>, fronting the beach. It is also continuing to work through the redevelopment of The Chimes building on Macleay Street in&nbsp;<a href="https://www.apartments.com.au/developments/potts-point-nsw-2011">Potts Point</a>, as well as Marlborough House, the redevelopment of the original David Jones warehouse building in&nbsp;<a href="https://www.apartments.com.au/developments/surry-hills-nsw-2010">Surry Hills</a>.

First look: Time & Place settles on design for The Chimes, Potts Point redevelopment

<a href="https://www.apartments.com.au/developers/develotek">Develotek</a> is joining the likes of TOGA, Deicorp, and One Global Capital, betting on a boom in Five Dock ahead of the 2032 mooted opening of the Five Dock Metro Station.

Develotek, which is currently developing Bianca on the Drummoyne waterfront and has plans approved for a tower in Chatswood, has filed a State Significant Development Application for a <a href="https://www.apartments.com.au/new-apartments/79-81-queens-road-five-dock-nsw-2046">two-building project in the evolving Kings Bay precinct</a>.

The buildings, one more boutique just five storeys and the other 26 storeys, will rise from an 3,158 sqm site across&nbsp;79–81 Queens Road and 2–8 Spencer Street, will home 134 one-, two-, and three-bedroom apartments, above ground-floor retail and five basement levels of parking.

A key component of the proposal is the inclusion of 15 per cent of residential floor space as in-fill affordable housing, unlocking additional height and density under the Housing SEPP.

<img alt="First Look: Develotek lodges State Significant shop top housing project in Five Dock precinct" data-entity-type="file" data-entity-uuid="3ee31bf7-75ba-4bc5-b190-49885193219f" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/podium_2.png?VersionId=730UbrduuwK3C1sO28RHjiLPUPqXqjkh" />

Designed by <a href="https://www.apartments.com.au/architects/plus-studio">Plus Studio</a>, the scheme adopts a podium-and-tower configuration, with a five-storey street wall along Queens Road transitioning to a 26-storey tower set deeper into the site. The ground plane prioritises activation and permeability, with retail frontages and a new through-site link connecting Queens Road to Spencer Street.

At the upper levels, the tower façade has been conceived using a modular system to support prefabrication and reduce construction waste, while improving build efficiency. The splayed form draws on the geometry of surrounding industrial rooftops, reinterpreting the area’s heritage in a contemporary expression while also helping to reduce solar heat gain to east and west-facing apartments.

“This project aspires to transform a former industrial site into a connected, resilient and people-focused urban community, grounded in Country, shaped by history, and designed to enrich everyday life within the evolving Kings Bay Precinct,” said John Walsh, Principal at Plus Studio.

The proposal reflects the broader transformation of the Kings Bay Precinct under the Parramatta Road Corridor Urban Transformation Strategy, marking a shift from its industrial past to a higher-density, mixed-use urban neighbourhood.

<img alt="First Look: Develotek lodges State Significant shop top housing project in Five Dock precinct" data-entity-type="file" data-entity-uuid="abde734c-1e31-4a97-a1d2-fa9bcf31c380" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/building%20podium.png?VersionId=fNUupP6u146yEytQT31kKVRxwtACgPpP" />

Develotek is emerging as an active participant in the state’s affordable housing-led uplift pathway. The developer recently secured approval for a 34-storey mixed-use tower in Chatswood, where it similarly leveraged the in-fill affordable housing provisions to increase scale and deliver a 101-unit scheme with dedicated affordable apartments.

Their entry into Five Dock places them alongside a growing list of developers targeting the suburb ahead of its anticipated transport uplift, with Sydney Metro set to extend into the area. Major players including TOGA, Deicorp, and One Global Capital are all progressing large-scale precinct-style developments nearby, collectively reshaping the low-rise industrial fabric into a higher-density mixed-use corridor.

The Five Dock site sits within the Kings Bay Precinct, a key renewal area under the Parramatta Road Corridor Urban Transformation Strategy, where planning controls support significant uplift tied to affordable housing delivery. The consolidated 3,158 sqm site is currently occupied by low-rise industrial uses, including warehouses and vehicle workshops, earmarked for transition.

First Look: Develotek joins in Five Dock apartment boom

Ascot’s Racecourse Road continues to be a hive of activity for Brisbane developers.

Following Fortis and GRAYA, which are both preparing new projects along the key strip connecting Kingsford Smith Drive and Eagle Farm Racecourse, local developer <a href="https://www.apartments.com.au/developers/skyhold">Skyhold</a> is the latest to lodge plans for its own development.

The group is proposing One One Two Residences, a boutique project comprising just seven apartments, named after its address at 112 Racecourse Road.

The proposal outlines a five-storey building on an 810 sqm site. The built form slightly exceeds the four-storey expectation under the neighbourhood plan, aligning instead with the emerging character of the strip. As the planning report notes, “the locality is characterised by a transition toward medium-rise residential development, with a number of recent developments… above the stipulated height limits.”

<img alt="First Look: Skyhold lodges plans for boutique Ascot apartments as Racecourse Road revival gathers pace" data-entity-type="file" data-entity-uuid="ec577631-8c51-4163-960e-e7b3a77d655b" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Ascot.png?VersionId=iAzQ46D4Uu1UqiS0mVnlcy9jeFKBpJIj" />

Designed by 111 with landscape architecture by <a href="https://www.apartments.com.au/landscape-architect/paul-bangay-garden-design">Paul Bangay Studio</a>, the scheme adopts a layered architectural approach with strong articulation and a subtropical response. Deep balconies, integrated planters, and a mix of masonry and textured finishes define the façade, while upper-level setbacks reduce perceived bulk. The architectural statement describes “a series of horizontally expressed layers, defined by deep balconies and a consistent robust material palette,” aimed at delivering a refined streetscape presence.

Apartments are configured as large-format residences, including multiple three-bedroom layouts and a full-floor penthouse, supported by ground-level parking. A rooftop terrace will provide communal amenities including a pool and landscaped recreation areas. The design prioritises privacy, natural ventilation, and greenery, with planting integrated across all levels to soften the building form and contribute to the public realm.

<img alt="First Look: Skyhold lodges plans for boutique Ascot apartments as Racecourse Road revival gathers pace" data-entity-type="file" data-entity-uuid="1e1219bd-b45a-4d7f-bbc7-7207d7b2fc94" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Ascot%20entry.png?VersionId=JIoUOLMgQ5xWpEF0etEI3ffIoIVjD7gO" />

The proposal sits within the Racecourse Road precinct, a key mixed-use spine in Ascot that continues to attract renewed development interest.

Later this year national developer Fortis will launch its own boutique development, which, pending council approvals, will be 16 apartments designed by Koichi Takada Architects, just down the street.

“Racecourse Road is going through a massive revitalisation and we’re proud to be a part of that transformation,” said Fortis's QLD General Manager, Dan Boman.

Nearby, GRAYA is advancing its larger-scale The Gallery, a mixed-use shop-top housing project designed to act as a “catalytic project for Racecourse Road.”

First Look: Racecourse Road, Hamilton revitalization to continue as Skyhold joins the party

Twenty-five years after launching one of Australia’s most visionary and successful masterplanned beach communities - Casuarina on the Northern NSW Tweed Coast - developer Consolidated Properties Group has unveiled plans for an $800 million sister project located 10 kilometres south, at Cudgera Creek near the coastal town of Pottsville.

CPG has taken the wraps off Caldera, a 78-hectare masterplanned village that builds on the legacy of Casuarina and aims to help address Northern NSW’s coastal housing shortage via the delivery of 550 homes built in a sustainable manner and addressing affordability and housing diversity, while also focusing on architectural and ecological merit.

Caldera is being brought to life by the same creative team that delivered Casuarina, led by Consolidated Properties CEO and chairman Don O’Rorke, Hutchinson Builders chairman Scott Hutchinson and renowned urban designer Brian Toyota, of architectural practice Bureau Proberts.

CPG has lodged a rezoning application with Tweed Shire Council for the Caldera site, which has been designated since 1991 as the Dunloe Park Urban Release Area, the final land release area within the Pottsville locality and one of only four remaining growth areas along the entire Tweed coastal strip. Preliminary plans for Caldera feature a 13-hectare retail and commercial precinct at the core of the village, surrounded by meticulously planned residential areas comprising around 550 homesites.

The retail hub will be anchored by a Coles Supermarket and will offer 7000 sqm of retail and 23 commercial lots designed to serve the local community and bring together curated shopping, dining, gym, wellness, childcare, medical and other essential services.

<img alt="Cons prop" data-entity-type="file" data-entity-uuid="fca7dc71-4b71-45b1-bb04-5a60bd7158d0" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-20%20at%208.34.04%E2%80%AFAM.png?VersionId=vAKwIvLuwmTKj6blHJRYIEeXS_8lCgUx" />

The project will create more than 1500 jobs over its development cycle, according to its economic modelling, and significantly address the shortage of employment land in the Tweed.

The residential areas will encourage a sense of community via a cohesive urban design that encourages walking, cycling, enhanced resident connectivity and reduced reliance on cars via bike paths and pedestrian-friendly streets.

Homesites will include a range of options from premium ridge-top homes to affordable housing options, ensuring a community that is inclusive of different income levels and designed to appeal to a wide demographic from baby boomers to families, singles and professionals. Architectural and planting covenants on home building will support the village’s built form and protect its character.

O’Rorke says CPG intends Caldera to be a model project delivered efficiently in a dedicated urban release area and ‘very much for this region and for this time’.

“Our vision for Caldera is to create a modern coastal village with its own unique northern NSW identity,” he said.

“Building on our legacy of Casuarina, 25 years on, this new village is designed to stand apart, offering the future of modern living, balancing the natural beauty of the region with contemporary amenities and convenience.

“Caldera will be more than just a place to live - it will be a welcoming, inclusive coastal village neighbouring Pottsville that invites visitors and embraces new residents. With its strong ties to the land, vibrant lifestyle and sense of place, Caldera will set a new standard for village living in Northern NSW.”

<img alt="CPG" data-entity-type="file" data-entity-uuid="9a5a7cf4-5f76-4ddf-bd05-c8fb77d0a787" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Screenshot%202026-04-20%20at%208.33.59%E2%80%AFAM.png?VersionId=J1CzCGD7kE7fcAMd41V4pKAf_sI4L5Jv" />

The project’s centrepiece is environmental sustainability, with comprehensive wetlands protection measures and planting of native trees, parklands, village greens and communal grounds to enhance the natural beauty of the area.

CPG will also deliver a developer-funded wastewater treatment plant to ensure zero ocean outflows and provide high quality long-term infrastructure for Tweed Shire.

A key focus is wildlife management planning, including extensive conservation controls for the West Pottsville koala population, aligned with Tweed Shire Council’s Koala Plan of Management and designed to enhance koala habitat connectivity and future population growth.

Caldera will extend the existing koala corridor by connecting koala precincts west of the Pacific Highway with populations in the north and east precincts. A koala underpass will be created under Pottsville Road to complete the connection of this important corridor. Native tree plantings will expand essential koala food sources, while approximately eight kilometres of exclusion fencing will be constructed to safeguard the koalas from urban threats.

The Caldera site is nestled in the hills of Cudgera Creek and benefits from its rich natural surroundings including the Pottsville Wetland, Cudgera Creek Nature Reserve and nearby Pottsville Beach.

It takes its name from the surrounding Tweed Shield Volcano and Caldera, the vast bowl-shaped depression stretching from Byron Bay to the Queensland border that 20 million years ago was the world’s largest shield volcano and which has shaped the region’s striking landscape, with Mount Warning standing as one of its most iconic features.

The development is a joint venture between CPG and Pottsville Development Corporation, which made its first investment in Pottsville more than 45 years ago and is the developer of Black Rocks By the Sea, a masterplanned community now part of the fabric of Pottsville and which was the catalyst for the construction of a bridge across the Pottsville Estuary, providing direct access to the beach.

CPG’s $1.5 billion Casuarina Beach township, 10 kilometres to the north of Caldera, commenced construction in 2000 and has become the model for modern Australian, eco-sensitive beachside development.

Consolidated Properties unveils $800m coastal village Caldera in Casuarina

Sea Level

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Over the past two weeks, storms pummelling the New South Wales coast have left beachfront homes at Wamberal on the verge of collapse. It’s stark proof of the risks climate change and sea level rise pose to coastal areas.
Our new research published today puts a potential price on the future destruction. Coastal land affected by flooding – including high tides and extreme seas – could increase by 48% by 2100. Exposed human population and assets are also estimated to increase by about half in that time.
Under a scenario of high greenhouse gas emissions and no flood defences, the cost of asset damage could equate up to 20% of the global economy in 2100.
Without a dramatic reduction in greenhouse gas emissions, or a huge investment in sea walls and other structures, it’s clear coastal erosion will devastate the global economy and much of the world’s population.
In Australia, we predict the areas to be worst-affected by flooding are concentrated in the north and northeast of the continent, including around Darwin and Townsville.
<img src="https://images.theconversation.com/files/350326/original/file-20200730-23-rmfjij.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="Man cleans up after Townsville flood"> 
A clean-up after flooding last year in Townsville, an Australian city highly exposed to future sea level rise. Dan Peled/AAP
<h2>Our exposed coasts</h2>
Sea levels are rising at an increasing rate for <a href="https://oceanservice.noaa.gov/facts/sealevel" target="_blank">two main reasons</a>. As global temperatures increase, glaciers and ice sheets melt. At the same time, the oceans absorb heat from the atmosphere, causing the water to expand. Seas are rising by about 3-4 millimetres a year and the rate is <a href="https://www.ipcc.ch/srocc/" target="_blank">expected</a> to accelerate.
These higher sea levels, combined with potentially more extreme weather under climate change, will bring damaging flooding to coasts. Our study set out to determine the extent of flooding, how many people this would affect and the economic damage caused.
We combined data on global sea levels during extreme storms with projections of sea level rises under moderate and high-end greenhouse gas emission scenarios. We used the data to model extreme sea levels that may occur by 2100.
We combined this model with topographic data (showing the shape and features of the land surface) to identify areas at risk of coastal flooding. We then estimated the population and assets at risk from flooding, using data on global population distribution and gross domestic product in affected areas.
<img src="https://images.theconversation.com/files/350322/original/file-20200730-29-eqrhbr.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="Homes at Collaroy in Sydney damaged by storm surge">
Many coastal homes, such as these at Sydney’s Collaroy beach, are exposed to storm surge damage. David Moir/AAP
<h2>Alarming findings</h2>
So what did we find? One outstanding result is that due to sea level rise, what is now considered a once-a-century extreme sea level event could occur as frequently as every ten years or less for most coastal locations.
Under a scenario of high greenhouse gas emissions and assuming no flood defences, such as sea walls, we estimate that the land area affected by coastal flooding could increase by 48% by 2100.
This could mean by 2100, the global population exposed to coastal flooding could be up to 287 million (4.1% of the world’s population).
Under the same scenario, coastal assets such as buildings, roads and other infrastructure worth up to US$14.2 trillion (A$19.82 trillion) could be threatened by flooding.
This equates to 20% of global gross domestic product (GDP) in 2100. However this worst-case scenario assumes no flood defences are in place globally. This is unlikely, as sea walls and other structures have already been built in some coastal locations.
In Australia, areas where coastal flooding might be extensive include the Northern Territory, and the northern coasts of Queensland and Western Australia.
Elsewhere, extensive coastal flooding is also projected in: - southeast China - Bangladesh, and India’s states of West Bengal and Gujurat - US states of North Carolina, Virginia and Maryland - northwest Europe including the UK, northern France and northern Germany.
<img src="https://images.theconversation.com/files/350319/original/file-20200730-35-19xjvnc.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="A woman struggles through floodwaters in Bangladesh">Bangladesh is among the nations most exposed to coastal flooding this century. SOPA
<h2>Keeping the sea at bay</h2>
Our large-scale global analysis has some limitations, and our results at specific locations might differ from local findings. But we believe our analysis provides a basis for more detailed investigations of climate change impacts at the most vulnerable coastal locations.
It’s clear the world must ramp up measures to adapt to coastal flooding and offset associated social and economic impacts.
This adaptation will include building and enhancing coastal protection structures such as dykes or sea walls. It will also include coastal retreat – allowing low-lying coastal areas to flood, and moving human development inland to safer ground. It will also require deploying coastal warning systems and increasing flooding preparedness of coastal communities. This will require careful long-term planning.
All this might seem challenging – and it is. But done correctly, <a href="https://www.propertyobserver.com.au/https://www.pnas.org/content/111/9/3292" target="_blank">coastal adaptation</a> can protect hundreds of millions of people and save the global economy billions of dollars this century.
<a href="https://theconversation.com/profiles/ebru-kirezci-1140869" target="_blank">Ebru Kirezci</a>, PhD candidate, <a href="https://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a> and <a href="https://theconversation.com/profiles/ian-young-807759" target="_blank">Ian Young</a>, Kernot Professor of Engineering, <a href="https://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a>
This article is republished from <a href="https://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/unwelcome-sea-change-new-research-finds-coastal-flooding-may-cost-up-to-20-of-global-economy-by-2100-143599" target="_blank">original article</a>.
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j.ballantyne1990-6AQqhLzZaK

Research finds coastal flooding may cost up to 20% of global economy by 2100

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GUEST OBSERVER
You may have seen recent maps showing how sea level rise may effect coastlines worldwide, including Australian cities. These maps have been produced by US-based website Climate Central.
For instance the video shows what they forecast sea level rise would be like in Melbourne with 4℃ and 2℃ of warming. This is not necessarily sea level rise that will occur over the coming century, but the eventual sea level locked in under particular temperature scenarios. It could take under 200 years or up to 2,000 for sea levels to reach these levels.
The picture isn’t pretty.
Maps such as these have triggered heated debate and discussion in different places in Australia (for instance Eurobodalla and Batemans Bay in New South Wales ) as individuals and organisations wrestled with the implications for property values, policy, long term planning and future risk management of our coastlines.
So is it time to sell up?
Coasts are always changing
This mapping helps us realise that coastlines are not static like property boundaries. They are in fact incredibly dynamic and continue to adjust to changes in sea level. The ambulatory nature of coastlines is a point worth remembering.
It is incredibly important to emphasise that the geomorphological, geological, ecological (i.e. dunes or reefs), or built characteristics of your local coastal environment have a huge influence on how coastlines respond to changing sea levels.
In some places beaches are advancing due to an excess in sand supply, while in other places a lack of sand means a coastline can recede (such as Old Bar on the mid-north coast of New South Wales). Furthermore, coral islands in the Pacific are now known to be dynamic in how they change shape and form in response to rising seas.
The rate of sea level rise is important in this regard. The point is, these maps cannot be taken at face value because they mask locally relevant environmental processes that will impact how sea level rise is experienced at any one place.
How are communities adapting to sea level rise?
In countries like Australia local and regional governments are doing more robust local studies forecasting sea level rise and coastal change. Good examples are the projects Mapping and responding to coastal inundation - undertaken jointly by the Sydney Coastal Councils Group and the CSIRO; and Coastal Vulnerability to Multiple Inundation Sources (COVERMAR) - a partnership between the Sydney Coastal Councils Group and the University of Sydney. Such efforts are much more useful for responding to the threats of sea level rise.
Recently proposed changes to policy and legislation in NSW make explicit the need to consider climate change and the risks it poses to our way of life. The proposed Coastal Management Act goes further and makes explicit mention of the risks posed by extreme storm events (compounded by rising sea levels) to our built environment and life.
The need for local information
Broad-scale maps such as these provide a visceral link between a warmer and wetter world, which can provide the general public with a broad educational tool to help them visualise and grasp what sea level change might look like in their local area.
They are useful for initiating local conversations in communities about the possible locations of critical infrastructure (e.g. nuclear power stations at coastlines) that will have life spans running to hundreds of years or even longer.
But to actually plan for sea level rise we need good, local information. In NSW decisions about coastal management are made mostly by local government. These decisions come about after a detailed study of the local coastal processes and environment, and the values placed on the coastal environment (e.g. property, recreation, aesthetics etc.).
Using a risk-based approach to coastal management and planning will help ensure that new high value development (e.g. infrastructure, power stations etc.) is not placed in areas exposed to rising seas.
The problem is existing development in areas now known to be hazardous with the most comprehensive analyses being presented in the National Coastal Risk Assessment  published by the Commonwealth Department of the Environment. A risk-based planning process should seek to avoid repeating those mistakes, but also allow for continued use of those areas until such time as it is unsafe.
Evaluating and making decisions about those risks is incredibly difficult and fraught with complexity (coastal evolution is the result of multiple factors), ambiguity (whose values matter?) and uncertainty (what really will happen in 100 years?). Having said that, coastal planners all over Australia (and around the world for that matter) are grappling with these issues. But, we still have a very long way to go.
Filippo Dall'Osso is researcher at the Natural Hazards Research Group, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/filippo-dallosso-206055" target="_blank">here</a>.
Dale Dominey-Howes is associate professor in Natural Disaster Geography, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/dale-dominey-howes-112724" target="_blank">here</a>.
Tom FitzGerald is PhD candidate in coastal hazard risk management, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/tom-fitzgerald-17927" target="_blank">here</a>.
All are authors for The Conversation.
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