Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Chch experiences more flooding because of the earthquakes

Christchurch experiences more flooding because of the earthquakes

March 5, 2014

Christchurch is now experiencing more frequent and severe flooding due to the impact of the earthquakes, University of Canterbury (UC) researchers said today.

It is more than three years since the first earthquake on 4 September 2010 and earthquake-induced ground deformations such as lateral spreading, liquefaction, subsidence and uplift are posing an enhanced flooding threat to Christchurch.

City residents’ concerns about frequent flooding of their houses and gardens have been a topical issue in recent years.

A UC geography masters student, Su Young Ko, says increased flooding is not just because of the extreme and prolonged rainfall but, is also due to various other natural environmental processes such as tides, background sea level rise and sea storms.

"One of the primary contributors to increased flooding hazards in Christchurch are the earthquakes which resulted in subsidence in some areas, narrowing of channels and uplifting of river beds," Su Young says.

Civil and natural resources engineer Dr Sonia Giovinazzi and geography researcher Dr Deirdre Hart have been investigating the city’s increased flooding hazard as a direct result of the earthquakes.

The cascading effects of the earthquake that led to changes in flooding hazard patterns across the city are being investigated as a key case study which involves Dr Christopher Gomez (Geography), Dr Tom Cochrane (Civil and Natural Resources Engineering) and Marion Gadsby (Environment Canterbury).

They are exploring flooding resulting from earthquake impacts on lifeline infrastructures, such as roads, waste, storm and drinking water, electricity and telecommunications systems, and the communities they support.

Their research is supported by the Natural Hazards Research Platform, Canterbury Civil Defence Emergency Management Group, Earthquake Commission, GNS Science, Christchurch City Council, Waimakariri District Council, Selwyn District Council, Environment Canterbury, Chorus, Orion, Contact Energy and the UC Quake Centre.

UC Geography Associate Professor and climatologist Peyman Zawar-Reza says the low pressure centre which parked itself just east of the South Island pumped substantial rain over the Canterbury region.

"Typically, cold fronts associated with low pressure centres propagate rather fast but this one is producing sustained rainfall over the region due to its slow progress.”

Dr Hart says this is the type of meteorological system that elevates sea levels locally at the same time as generating big waves off the eastern South Island.

"High wind speeds working on transferring their energy to the sea surface over several days makes for extreme coastal conditions. Where we had four metre wave heights a week ago, 12 metre high waves are now being recorded off Banks Peninsula.

"Compounding these effects, we are just coming out of a spring tide cycle where we experience our highest monthly tidal water levels," says Dr Hart, former chair of the New Zealand Coastal Society.

Dr Gomez says his research shows that unfortunately such events are a scary reality for numerous coastal cities around the globe, such as Tokyo in Japan, Jogjakarta in Indonesia, and even Wellington in New Zealand.

"We all have vivid memories of what has happened recently in the UK and we have to learn to better manage such events." Dr Gomez says.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell: On The Farcical Elevation Of David Seymour

With the election won, it’s time to find jobs for the boy. David Seymour is the Act Party’s latest scrounger to be rewarded by the National Party, and not only with a seat in Parliament. This time around, a couple of parliamentary Undersecretary posts in education and regulatory reform have been thrown in, plus an annual salary of $175,000 while he learns the ropes. Shouldn’t Seymour at least be put on a 90 day trial before he gets his hands on that sort of serious moolah?

It would be for his own good, really. At this rate, Act is never going to learn how to make its own way in the world More>>

 

As Key Mulls Joining ISIS Fighting: McCully Speech To UN Backs Security Council Bid

It is an honour to address you today on behalf of the Prime Minister and Government of New Zealand. Our General Election took place last week - our Prime Minister Rt Hon John Key is engaged in forming a government and that is why he is unable to be here in New York... More>>

ALSO:

Labour: Cunliffe Triggers Party Wide Leadership Contest

David Cunliffe has resigned as Labour Leader, but says he will seek re-election... If there is any contest the election will have to go through a process involving the party membership and union affiliates. More>>

ALSO:

Flyover Appeal: Progress And Certainty, Or Confusion And More Delays?

Lindsay Shelton: The Transport Agency, embarrassed by the rejection of its flyover alongside the Basin Reserve, says it’s appealing because the decision could “constrain progress.” Yet for most clear-sighted Wellingtonians a 300-metre-long concrete structure above Kent and Cambridge Terraces would in no way be seen as progress… More>>

ALSO:

Gordon Campbell: On Cunliffe’s Last Stand

Right now, embattled Labour leader David Cunliffe has three options. None of them are particularly attractive for him personally, or for the Labour Party... More>>

ALSO:

Key Seeking 'New Ideas': Look To Children’s Commissioner On Poverty - Greens

John Key should not reinvent the wheel when it comes to ideas for tackling child poverty, and instead look to the recommendations of the Children’s Commissioner’s Expert Group on Child Poverty, Green Party co-leader Metiria Turei says. More>>

ALSO:

'Safe To Re-Enter' - OIA Docs: Safety Is Absolute Priority At Pike River Mine

“We understand that the time it is taking to complete our evaluation of the risks is frustrating for the family members and we are trying to complete this work as quickly as we can,” Ms Dunphy says. “It is Solid Energy’s responsibility to make this decision and we will do so, once we have all the information required to make a fully-informed decision.” More>>

ALSO:

Images & Report: Mihi To Welcome Newly-Elected MPs To Parliament

The 29 newly elected MPs were welcomed into Parliament with a Mihi. Parliament’s current Speaker David Carter offered advice from his experience working in Parliament advising the MPs to work collaboratively. More>>

Gordon Campbell: On Labour’s Very Bad Year

While Labour leader David Cunliffe still appears to be in denial about the extent of Saturday night’s debacle, there was hardly a single redeeming feature about the election results for the centre-left... More>>

ALSO:

General Election NZ: National Win

Election Night: With almost all votes counted National and John Key have won a third term and are close to being able to govern alone if they so choose. Key has indicated he will still reach out to form a Government with ACT, United Future and Maori Party. More>>

ALSO:

Perfectly-Timed Anniversaries: Suffrage Day Is Last Chance To Enrol

“The last chance to enrol is Friday 19 September. You can’t enrol on election day.” More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
More RSS  RSS
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news