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

Patience: Drive Safe

Be patient before passing is the AA's message for drivers this Labour weekend.

"People taking crazy risks to get past other vehicles is one of the most dangerous things on the road,” says AA spokesperson Dylan Thomsen.

“The weather is looking good for the long weekend so the roads will be busy. Unfortunately, that also increases the chances of people getting frustrated and trying a risky passing manoeuvre. When they get past, there will probably be more traffic up ahead anyway so it won’t get people there faster.” More>>

 
 

Parliament Today:

Employment Relations Bill: Govt Strains To Get Tea Break Law Through

The Government has been left with egg on its face - failing to get its much-vaunted, but hugely unpopular, meal break law passed in the first week of its new term, Labour spokesperson on Labour Issues Andrew Little says. More>>

ALSO:

Guns: Police Association Call To Arm Police Full Time

"The new minister gave his view, that Police do not need to be armed, while standing on the forecourt of parliament. The dark irony was that the interview followed immediately after breaking news of a gunman running amok in the Canadian parliament in Ottawa..." More>>

ALSO:

Gordon Campbell: On The Tokenism Of New Zealand's Role Against Islamic State

Our contribution against IS will be to send SAS forces to train the Iraqis? That’s like offering trainers to General Custer just as the 7th cavalry reached the Little Big Horn. More>>

ALSO:

Scoop Business: Shell And Todd Caught Drilling Without Approval

Multi-national oil company Shell’s New Zealand arm and local energy giant Todd Energy have breached the new law governing New Zealand’s Exclusive Economic Zone, the Environmental Protection Authority says in an Oct. 10 document released by the Green Party. More>>

ALSO:

Gordon Campbell: On Pharmac, Gough Whitlam And Sleater-Kinney

We’re not at the outset of these negotiations. The outset was six years ago, and negotiators were hoping to have some sort of ‘framework’ deal finished in time for the APEC meeting in a few weeks’ time. These ‘extreme’ positions are what we’ve reached near the intended end of the negotiations… More>>

ALSO:

PM Of Many Hats: Questions, No Answers On Whale Oil

Dr RUSSEL NORMAN (Co-Leader – Green) to the Prime Minister: How many times since November 2008 has he spoken with blogger Cameron Slater on the phone and how many times, if any, has he texted him?
Rt Hon JOHN KEY (Prime Minister): None in my capacity as Prime Minister. More>>

ALSO:

Aussie Investigation Dropped: Call On Minister McCully To Pursue The Case Of Balibo Five

West Papua Action is deeply concerned at the lack of any clear outcome from the Australian Federal Police inquiry into the 1975 deaths of the ‘Balibo Five’ including NZ journalist Gary Cunningham. More>>

ALSO:

'Feed The Kids' Bill: Metiria Turei To Lead Fight On Feeding Hungry Children

Green Party Co-leader Metiria Turei is urging all political parties to support the Feed the Kids Bill which she inherited today from Mana leader Hone Harawira. More>>

ALSO:

Parliament Today: State Opening Of Parliament

The House sat at 10.30am on Tuesday before MPs were summoned to hear the Speech from the Throne in the Legislative Council Chamber. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news