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Problems Climate Change and Sea level Rise

Climate Change and Sea Level Rise

 

>>Click here for the link to DEFRA website on Climate Change<<

 

The predicted effects of climate change and sea level rise present a significant challenge for future coastal management.  It is anticipated that there will be increased risk to many coastal assets.  Key pressures are identified as follows:
  • Increased problems of overtopping of existing defence structures due to sea level rise.
  • Increased beach volatility and increasing sea levels will mean beach recharge schemes may require increased material volumes.
  • Diminishing beaches and marshes in front of defences reducing both support and protection of structures.
  • Higher sea levels will result in greater wave heights at the shoreline, resulting in increased wave forces on structures.
  • Potential changes in patterns of longshore drift could result in altered patterns of erosion and deposition.
  • Increased potential for 'flash flooding' of low-lying areas by intense rainfall events.
  • Erosion and 'squeeze' of inter tidal habitats between rising sea levels and existing or new coastal defences.

Climate Change

 

Scientist’s have determined that over the last century that the temperature of central England has risen by almost 1° C, winters have been getting wetter and average sea levels are rising.  There are many uncertainties as to how climate change will impact upon us but we can be certain that in some shape or form, as a threat or opportunity, it will affect us all.  As we are “borrowing the environment from our children’s children” we should ensure that our actions are sustainable.

 

The Council provides services that can directly affect the local economy and the environment, it should therefore be well situated to help society to respond to climate change. The Council should be able to co-ordinate both mitigation and adaptation strategies, so that we can attempt to slow the rate of future human-induced climate change, whilst simultaneously adapting to current climate change.  

 

The following “steps” are recommended to help the Authority to take climate change issues forward:

 

Ø      Establish HBC’s present commitment to Climate Change i.e. an audit of existing services affected,

Ø      Identify whether Climate Change presents a “threat” or an “opportunity” to the various services,

Ø      Identify whether the service can promote “mitigation” or “adaptation”,

Ø      Identify opportunities to co-ordinate actions (the new GIS may help with this),

Ø      Develop a HBC climate change communication strategy,

Ø      Develop a HBC climate change action plan (advise the use of different epochs e.g. 0 to 20 years and 20 to 100 years to avoid initial barriers to change),

Ø      Circulate the “Weathering the Storm” video,

Ø      Formation of Climate Change Forum, officers with/without members.

 

Click here to view Havant Borough Council's Sustainability Appraisal

 

>>Click here to view Portsmouth City Council's Sustainability Strategy (external link)

 

>>Click here to view Gosport Borough Council's Sustainability Appraisal (external link)

 

 

Sea Level Rise

Click on the two links below for a definition of Sea Level Rise in the UK.

 

>>Click here for an explained diagram on 'Sea level - Level Terminology' (PDF 122KB)<<

 

>>Click here for an explained diagram on 'Sea Level Rise' present situation (PDF 76KB)<<

 

The table below sets out the regional net sea level rise allowances predicted over the next 100 years.  These figures have taken from the DEFRA Flood and Coastal Defence Appraisal Guidance 3, (FCDPAG3) Economic Appraisal, October 2006.

 

Regional net sea level rise allowances

Administrative or Devolved Region

Assumed Vertical Land Movement (mm/yr)

Net Sea-Level Rise (mm/yr)

 

 

1990- 2025

2025- 2055

2055- 2085

2085- 2115

Previous allowances

East of England, East Midlands, London, SE England

(south of Flamborough Head)

-0.8

4.0

8.5

12.0

15.0

6mm/yr* constant

 

>> Click here to view the FCDPAG3 document<< (external link)