Sinking coastlines mean parts of Christchurch will feel impact of sea-level rise earlier than expected
From reporter Tina Law:
Parts of Christchurch will feel the impacts of sea-level rise earlier than expected because the land is sinking, according to new data.
Large areas from Woodend to Lake Ellesmere, including Banks Peninsula, are subsiding up to three millimetres per year, which means an extra 30 centimetres of sea-level rise over the next 100 years.
The data has come from NZ SeaRise, a five-year research programme funded by the Government involving 30 local and international experts.
It has taken into account the natural rises and falls of the country’s coastline, as well as climate change and warming temperatures to project sea level rises.
Using a www.searise.nz... |new online tool|, New Zealanders will for the first time be able to see how much and how fast sea levels will rise along their own stretch of coast and in their neighbourhood.
Programme co-leader Professor Tim Naish, of Victoria University of Wellington, said 20 years ago it was thought sea-level rise was like pouring water into a bathtub – if you put more water in, it rises uniformly around the world, but Naish said it is actually much more complicated.
Sea levels are expected to rise at different rates across New Zealand and even at different levels across Canterbury’s coastline.
The largest increases in sea levels are expected to occur along the southeast of the North Island along the Wairarapa Coast.
Programme co-leader Dr Richard Levy, of GNS Science and Victoria University of Wellington, said subsidence rates along that coast were high, and sea levels could rise by well over 1.5 metres by 2100 if the least optimistic climate change scenario was followed.
Based on current international emissions reduction policies, global sea levels are expected to rise by about 60cm by 2100, but for large parts of New Zealand this could double to about 1.2m due to ongoing land subsidence, Naish said.
“We have less time to act than we thought.”
According to the data, Akaroa on Banks Peninsula would see 30cm of sea-level rise by 2040, instead of 2060. The coastline in the area is sinking by 3mm a year.
“Thirty centimetres of sea-level rise means the one in 50-year coastal storm flood will occur annually,” Naish said.
However, some areas at the top of Lyttelton Harbour have shown a rise in the land.
Land movement data was based on median numbers taken between 2003 and 2011, and does not include the impact of the Christchurch earthquakes.
The data showed New Brighton’s coastline was sinking at 0.8mm a year, but Naish said since the earthquakes it has actually been sinking at 8mm a year, twice as fast as the global sea-level rise.
“We don’t know how long this will go on for.”
Levy said he expected councils and planners to be the primary users of the new projection information, and that the finance and insurance sectors had already been asking for the data.
Naish said the new science would give time to put in place equitable and effective adaptation measures that would limit the impact of unavoidable sea-level rise.
The Christchurch City Council has already embarked on a long process to adapt the city and Banks Peninsula to climate change.
Changes to managing new developments are being made to the district plan and the council has agreed on guidelines for adapting existing areas.
Whakaraupō Lyttelton Harbour will be the first area in Christchurch to go through climate change planning, expected to start in the spring and take 18 months.
Simon Watts, observatory director at Brighton Observatory of Environment and Economics who built his home in Southshore, said it was always better to know about things rather than be ambushed, but said the devil was always in the detail.
He said there were areas in Christchurch that rose after the earthquakes and others that sunk.
“For some areas it could be good news and others it could be bad news.
“Yes, people should be concerned because if parts of New Zealand sink by 3mm a year, that is effectively doubling the rate of sea level rise for those places."
Poll: Should the government levy industries that contribute to financial hardship?
As reported in the Post, there’s a $30 million funding gap in financial mentoring. This has led to services closing and mentors stepping in unpaid just to keep helping people in need 🪙💰🪙
One proposed solution? Small levies on industries that profit from financial hardship — like banks, casinos, and similar companies.
So we want to hear what you think:
Should the government ask these industries to contribute?
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59.8% Yes, supporting people is important!
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25.9% No, individuals should take responsibility
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14.4% ... It is complicated
Please Share This Story From Otautahi Newsroom Far and Wide To Help These Men
Otautahi Newsroom
Concerns are being raised about the safety, care standards, and duty of care at a Comcare-supported residential flat in Bishopdale, Christchurch, where vulnerable older men with significant mental health conditions are living.
An advocate speaking on behalf of four residents , says the men are experiencing ongoing intimidation, alleged abuse, and serious safety risks within the flat. The residents are described as having limited capacity to advocate for themselves and have asked for help to bring the situation to public attention.
The flat houses five male residents, all aged over 60 and all considered vulnerable adults with psychiatric illnesses. It is alleged that one resident, I (64), has displayed escalating aggressive and intimidating behaviour over a period of approximately five years. According to reports from residents and those advocating for them, this behaviour has included verbal threats, alleged physical incidents, repeated boundary violations, and conduct that has left others living in fear.
Reported incidents include police attendance following an alleged knife-related event and theft of personal property, an incident in which one resident was allegedly restrained in his bed, repeated verbal intimidation, and unauthorised entry into other residents’ bedrooms. There are also claims that staff members have been assaulted or felt unsafe attending the property, with some reportedly conducting visits from outside the flat due to safety concerns.
Advocates say the ongoing situation has had a severe impact on the mental and physical wellbeing of the affected residents. All four men report feeling unsafe in their own home, with some considering leaving the property despite believing they should not be forced out of housing they were promised would be safe and stable.
One resident, D, who has both mental health needs and a heart condition, is said to have taken on an informal role trying to protect others. Advocates argue this is inappropriate and unsafe, stating that residents should not be expected to manage high-risk situations without professional support. They also claim that Comcare has breached contractual commitments to provide safe, peaceful, and stable housing.
Further concerns have been raised about the suitability of the property itself. The Bishopdale house was originally a four-bedroom home with one bathroom but was altered to accommodate a fifth resident by converting a sunroom into a bedroom. Critics argue that having one toilet for five men over the age of 63 is inadequate and compromises dignity, health, and wellbeing.
There are also claims from a family member of a former resident that care provided to her terminally ill brother at the property was insufficient, adding to broader concerns about oversight and duty of care.
Despite multiple complaints reportedly being lodged with agencies, advocates say they have seen no meaningful action. They are now calling for urgent intervention, including:
• Immediate rehousing of resident I into a 24-hour staffed care facility, dementia care, or appropriate hospital setting
• An urgent, independent investigation into Comcare’s management of the Bishopdale property
• Assessment of whether elder abuse or neglect is occurring
• A full review of duty of care, risk management, and safeguarding practices
• Immediate measures to ensure the safety and wellbeing of the remaining residents
Advocates warn that without urgent action, there is a serious risk of harm. They say the men deserve to live without fear and with appropriate care that protects their dignity, mental health, and quality of life.
A Neighbourly Riddle! Don’t Overthink It… Or Do?😜
Do you think you know the answer? Simply 'Like' this post if you know the answer and the big reveal will be posted in the comments at 2pm on the day!
If you multiply this number by any other number, the answer will always be the same. What number is this?
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