Prediction and planning – coastal erosion in Tāmaki Makaurau

Prediction and planning – coastal erosion in Tāmaki Makaurau

0 개 215 노영례

3368e7303cdeb2baf403ff0f575adab7_1614295108_2499.png
 

Coastal hazards such as erosion and flooding pose a very real risk to coastal communities around Tāmaki Makaurau/ Auckland. The impacts of coastal erosion and other coastal hazards will be influenced by our changing climate, including the effects of sea-level rise, and the decisions we make as Tāmaki Makaurau continues to grow.

To better understand the potential impacts of coastal erosion, Auckland Council has released a new report, ‘Predicting Auckland’s Exposure to Coastal Instability and Erosion that assesses the areas of Auckland that are susceptible to coastal erosion and cliff instability. The report explains the methodology used in a scientific study to estimate erosion rates for Auckland’s beaches and cliffs and includes regional-scale maps that identify which of Auckland’s coastal areas may be susceptible to coastal erosion and instability over a range of time periods.

Coastal erosion is the loss of land due to coastal processes, such as waves and tidal currents, wearing away land suddenly or slowly over time. This results in shorelines moving inland and makes cliffs unstable as the base erodes.

Councillor Richard Hills, chair of the council’s Environment and Climate Change Committee, says that uncertainty about sea level rise means coastal erosion rates have historically been difficult to predict.

“Our new Coastal Instability and Erosion report gives us stronger guidance using up to date data. The report identifies areas of Auckland’s coastline predicted to be susceptible to coastal erosion and instability with the findings giving us a high-level understanding of potential erosion rates across the region,” says Councillor Hills.

Why has the council undertaken this study?

The council’s Acting General Manager- Engineering and Technical Services, Paul Klinac, explains that the New Zealand Coastal Policy Statement directs councils to identify areas that may be affected by coastal hazards over a timeframe of at least 100 years.

“The council has requirements under the Resource Management Act, the Building Act, the Local Government Act and the Civil Defence Emergency Management Act to have a good understanding of areas potentially at risk from natural hazards like coastal erosion to support appropriate land-use planning and development decisions,” says Mr Klinac.

Mr Klinac says that the council’s new assessment builds on previous work from 2006 and provides a more thorough understanding of how Auckland’s coastal environment may change in the future taking into account sea level rise projections.

This research is similar to studies undertaken by other councils in New Zealand and brings us into alignment with nationally accepted practice.

What does the report predict?

Based upon recommendations from the Ministry for the Environment (2017), coastal erosion hazard maps for Auckland were generated based on 1.2 m of sea level rise over the next 100 years. The distance inland from the coastline that could be susceptible to coastal instability and erosion varies significantly across Auckland. Over the 100-year timescale modelled in the report, these distances vary from less than 20 metres in sheltered harbour coast beaches, to more than 200 metres for high cliffs like those along the open and exposed coast of Aotea / Great Barrier Island.

What are coastal erosion hazard maps?

“Coastal erosion maps provided in the report show the extent of areas that may be at risk of coastal erosion out to the year 2130 and include the impact of predicted sea level rise. They provide an illustration of a range of land instability and erosion distances for both cliff and low-lying shorelines along Auckland’s coastline,” says Mr Klinac.

“These maps show areas predicted to be susceptible to coastal instability and erosion. There are separate maps for each of the modelled scenarios over a range of timescales – 30 years, 50 years and 100 years. Cliffs and beaches are presented separately as the forecast erosion rates are based on different scientific models.”

How will the information in the report be used?

The council’s General Manager - Resource Consents, Ian Smallburn, stresses that the report is a regional scale study and says that the reports and modelling results apply to broad areas. He says he wouldn’t expect the report to be used as a reference in relation to specific sites (such as individual properties) without a more detailed assessment.

“Some people may follow up this work by having qualified professionals undertake site specific assessments,” says Mr Smallburn.

“This would provide a more localised assessment than presented in this study. As already happens, the council may request site specific studies for resource consent applications where development is proposed in a hazard area.”

 

In partnership with mana whenua and local communities, the council is also preparing coastal management plans (CMPs) with development of the region’s first CMP about to start in Whangaparāoa. The coastal hazard data from this report will be considered during the development of CMPs.

Next steps

Councillor Hills reminds Aucklanders that this work is a very necessary part of understanding the impacts of climate change and expects an ever-increasing focus on these impacts moving forward.

The council is now converting these results into an online format which will be available on Auckland Council’s GIS system ‘GeoMaps’ by mid-2021.


출처 : Auckland Council News

No new community cases; 3 cases of COVID-19 i…

댓글 0 | 조회 117 | 1일전
There are no new cases in the community to report today.There are three new positive cases of COVID-19 to report in managed isolation since our last m… 더보기

Survey shows strong support for increased inv…

댓글 0 | 조회 91 | 2일전
A Colmar Brunton survey of more than 4000 Aucklanders has found 46 per cent support for Auckland Council’s proposed 10-year Budget, with 37 per cent o… 더보기

No new community cases; 1 new case of COVID-1…

댓글 0 | 조회 329 | 2일전
There are no new cases in the community to report today. The border worker announced by the Ministry of Health yesterday has been officially included … 더보기

Commemorating Anzac Day

댓글 0 | 조회 177 | 2일전
Auckland Council is proud to partner with the Auckland RSA to deliver Auckland’s 2021 Anzac Day. Below are all the details you need to honour our vete… 더보기

1 border case; 1 new historical case of COVID…

댓글 0 | 조회 132 | 3일전
There are no new community cases of COVID-19 to report today.There is one border worker who has returned a positive test result for COVID-19 – they wo… 더보기

New playground celebrated at Western Springs …

댓글 0 | 조회 181 | 3일전
Western Springs Lakeside Te Wai Ōrea Park has a brand new ecology-themed playground.The renewed playground fits with its natural surroundings and incl… 더보기

No new community cases; 2 new cases of COVID-…

댓글 0 | 조회 68 | 4일전
There are no new cases in the community to report today.There are 2 new positive cases of COVID-19 to report in managed isolation since yesterday. The… 더보기

Government partnership with Amazon Studios is…

댓글 0 | 조회 97 | 4일전
Friday's confirmation of a long-term partnership between the New Zealand Government and Amazon Studios around its streaming series based on The Lord o… 더보기

No new community cases; 4 new cases of COVID-…

댓글 0 | 조회 98 | 5일전
There are no new cases in the community to report today.There are four new positive cases of COVID-19 and 1 historical case to report in managed isola… 더보기

Queen Street gets a makeover as COVID-19 work…

댓글 0 | 조회 351 | 5일전
Pocket park, boardwalks and planting for northern end of Queen StreetWide boardwalks, seating and native plants in planter boxes will soon replace the… 더보기

New residential parking zone confirmed for Ta…

댓글 0 | 조회 284 | 7일전
Takapuna will soon have a new residential parking zone - providing greater parking availability and flexibility for residents and visitors.The zone wi… 더보기

No new community cases; 1 case of COVID-19 in…

댓글 0 | 조회 118 | 7일전
There are no new cases in the community to report today.There is one new positive case of COVID-19 to report in managed isolation since our last media… 더보기

Border trial of app to detect COVID-19 early

댓글 0 | 조회 175 | 8일전
A trial is underway to see if an app connected to wearable smart devices can detect COVID-19 in border workers before they experience symptoms, says S… 더보기

No new community cases; 2 cases of COVID-19 i…

댓글 0 | 조회 107 | 8일전
There are no new cases in the community to report today.There are two new positive cases of COVID-19 to report in managed isolation since our last med… 더보기

People-friendly streets trial gets underway i…

댓글 0 | 조회 232 | 9일전
A new trial road layout in Henderson town centre to help improve traffic flow and provide a safe alternative for people to use bikes, scooters and pub… 더보기

No new community cases; 2 cases of COVID-19 i…

댓글 0 | 조회 77 | 9일전
There are no new cases in the community to report today.There are two new positive cases of COVID-19 to report in managed isolation since our last med… 더보기

No new community cases; 4 cases of COVID-19 i…

댓글 0 | 조회 85 | 2021.04.13
There are no new cases in the community to report today.There are 4 new positive cases of COVID-19 to report in managed isolation since our media stat… 더보기

Poetry inspired by nature, made with nature

댓글 0 | 조회 81 | 2021.04.13
Elizabeth Welsh wants to quite literally bring a piece of Āwhitu to her poetry.The Titirangi poet, who has been announced as Auckland Council’s Artist… 더보기

No new community cases; 7 cases of COVID-19 i…

댓글 0 | 조회 328 | 2021.04.12
There are no new cases in the community to report today.There are 7 new positive cases of COVID-19 to report in managed isolation since our media stat… 더보기

Auckland Council welcomes youth climate strik…

댓글 0 | 조회 160 | 2021.04.12
Business as usual will not protect us from the climate crisisYoung people are justified in the urgency they are expressing, and it’s up to all of us n… 더보기

New border-related positive COVID-19 case

댓글 0 | 조회 220 | 2021.04.11
A worker at the Grand Millennium managed isolation facility – who is a close contact of the case reported on Thursday – has tested positive for COVID-… 더보기

No new community cases; 3 cases of COVID-19 i…

댓글 0 | 조회 141 | 2021.04.11
There are no new COVID-19 community cases to report today and three new positive COVID-19 border-related cases in managed isolation since our last upd… 더보기

More feedback needed on low traffic area tria…

댓글 0 | 조회 106 | 2021.04.11
Stage one of the Arthur Grey Low Traffic Area trial in Onehunga will continue over the next two weeks so that Maungakiekie-Tāmaki Local Board can rece… 더보기

No new community cases; 10 cases of COVID-19 …

댓글 0 | 조회 200 | 2021.04.10
There are no new COVID-19 community cases to report today and 10 new positive COVID-19 border-related cases in managed isolation since our last update… 더보기

Work about to start on new facilities at Milf…

댓글 0 | 조회 185 | 2021.04.10
Showering, changing and making a pit stop at Milford Reserve is going to get easier with work about to kick off on new toilet and changing room facili… 더보기

Update on border-related case; crew member un…

댓글 0 | 조회 216 | 2021.04.09
The case investigation into the border-related COVID-19 case in a worker at the Grand Millennium managed isolation facility continues.The person’s fur… 더보기

No new community cases; 6 cases of COVID-19 i…

댓글 0 | 조회 121 | 2021.04.09
There are no new COVID-19 community cases to report today and 6 new positive COVID-19 border-related cases in managed isolation since our last update … 더보기

Trans-Tasman bubble a big boost for Auckland

댓글 0 | 조회 202 | 2021.04.09
Mayor Phil Goff welcomed the announcement of a trans-Tasman bubble which will allow families to reunite and give a much-needed boost to the city’s tou… 더보기

Border-related case confirmed as current case

댓글 0 | 조회 198 | 2021.04.09
The new border-related COVID-19 case reported earlier today is now confirmed as a current case after today’s test result returned positive. Other test… 더보기

One new border-related case;   19   cases of …

댓글 0 | 조회 542 | 2021.04.08
There is one new border-related positive COVID-19 case, in a worker at the Grand Millennium managed isolation facility. The worker returned a positive… 더보기

Astonishing engineering and meticulous restor…

댓글 0 | 조회 89 | 2021.04.08
After four years of City Rail Link-related closure, innovative construction and meticulous restoration are celebrated today with Auckland’s historic C… 더보기

No new community cases; 7 cases of COVID-19 i…

댓글 0 | 조회 199 | 2021.04.07
There are no new COVID-19 community cases to report today and 7 new positive COVID-19 border-related cases in managed isolation since our last update … 더보기

Butterflies in Blockhouse Bay

댓글 0 | 조회 505 | 2021.04.07
By Jacqui KnightWhat do you remember about butterflies from your childhood? In many countries butterflies have a special cultural significance. For ex… 더보기

No new community cases; 17 cases over 2 days …

댓글 0 | 조회 213 | 2021.04.06
There are no new COVID-19 community cases to report today and 17 new positive COVID-19 border-related cases in managed isolation since our last update… 더보기

Be a tidy Kiwi neighbour

댓글 0 | 조회 196 | 2021.04.05
Top tips for helping avoid illegal dumpingThere are better ways to find a new home for unwanted items instead of leaving them outside hoping someone w… 더보기

No new community cases; 6 cases of COVID-19 i…

댓글 0 | 조회 181 | 2021.04.04
There are no new COVID-19 community cases to report today and six new positive COVID-19 border-related cases to report in managed isolation over the p… 더보기

Central City Library closed until further not…

댓글 0 | 조회 235 | 2021.04.03
Auckland Central City Library closed, from 6pm on Thursday 1 April, until further noticeThe Central City Library is closed, from 6pm on Thursday 1 Apr… 더보기

Kaumatua housing plan gets a boost

댓글 0 | 조회 492 | 2021.04.02
More kaumatua units for PapakuraThree extra kaumatua housing units will be built at Papakura Marae – bringing the total to nine.With six units nearing… 더보기

No new community cases; 5 cases of COVID-19 i…

댓글 0 | 조회 168 | 2021.04.01
There are no new COVID-19 community cases to report today and five new COVID-19 border-related cases to report in managed isolation.The seven-day roll… 더보기

Auckland population may hit 2 million in earl…

댓글 0 | 조회 162 | 2021.03.31
Auckland’s population may rise from about 1.7 million currently to 2 million by early next decade, Stats NZ said today.“Auckland will likely have the … 더보기

Influenza immunisation to begin mid-April as …

댓글 0 | 조회 129 | 2021.03.31
The Ministry of Health is confirming this year’s influenza immunisation programme will begin as scheduled in two weeks for those aged 65 and over and … 더보기

No new community cases; 2 cases of COVID-19 i…

댓글 0 | 조회 129 | 2021.03.31
There are no new COVID-19 community cases to report today and two new COVID-19 border-related cases to report in managed isolation. The seven-day roll… 더보기

Auckland's Cornwall Park is raising animals f…

댓글 0 | 조회 487 | 2021.03.31
Members of the public are outragedto learn that cows farmed on Epsom’s Cornwall Park have been sold to live animal exporters.Cornwall Park was gifted … 더보기

Gold award for Tūpuna Maunga Authority visito…

댓글 0 | 조회 175 | 2021.03.31
The Tūpuna Maunga Authority’s ‘Te Ipu Kōrero o Maungawhau / Maungawhau Visitor Experience Centre’ has won a coveted gold award at the prestigious IDA … 더보기

No new community cases; 2 cases of COVID-19 i…

댓글 0 | 조회 109 | 2021.03.30
There are no new COVID-19 community cases to report and 2 new COVID-19 border related cases to report in managed isolation. The seven-day rolling aver… 더보기

Independent review finds need for significant…

댓글 0 | 조회 99 | 2021.03.30
The independent review of health and safety at Ports of Auckland has found systemic problems at the Ports in relation to critical health and safety ri… 더보기

No new community cases; 11 cases of COVID-19 …

댓글 0 | 조회 173 | 2021.03.29
There are no new COVID-19 community cases to report and 11 new COVID-19 border related cases to report in managed isolation. The seven-day rolling ave… 더보기

Ormiston Town Centre is open for business

댓글 0 | 조회 420 | 2021.03.29
Ormiston Town Centre officially opened its doors for business this morning.The major retail destination, delivered by Todd Property Group in partnersh… 더보기

No new community cases; 1 case of COVID-19 in…

댓글 0 | 조회 114 | 2021.03.28
There are no new community cases and 1 new COVID-19 border related case to report in managed isolation.Grand Mercure managed isolation facilityThe inv… 더보기

Tsunami siren test on Sunday 4 April

댓글 0 | 조회 201 | 2021.03.28
The sound Rodney and Waitākere residents can’t ignore Easter SundayIf you’re still napping around midday Easter Sunday (April 4), enjoying the extra h… 더보기