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Climate change to boost summer flash floods, says study

Posted in Science on 2nd Jun, 2014 01:10 AM by AlexMuller

Global warming will lead to a significant increase in extreme summer downpours in the UK, a study suggests. The Met Office and Newcastle University researchers say there could be five times the number of "extreme rainfall events" per hour, under extreme warming projections. This would cause "really severe" flash flooding in many parts of the UK. 


However, they caution that this result is based on only one computer model. Flash flooding in Britain has had devastating impacts on communities in recent years. In Boscastle, north Cornwall, about 200mm (8in) of rain fell in four hours in August 2004 causing a 3m wall of water to sweep through the village.

In the summer of 2012, in Newcastle, the equivalent of a month's rain fell in just two hours, causing widespread flooding in the city. Researchers have struggled to work out how global warming might affect these types of events. Until now, their climate models have not been good enough to work out the effect on extreme hourly rainfall in the warmer months.

Tags: global warmingclimate changeenvironmentfloodingrainfall

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Author: Guest
Posted: 2014-06-02
We have already had winter floods in the UK and this was linked to the global worming according to some studies. If more is to come his summer the first think is to think about better prevention Reply
Author: Guest
Posted: 2014-06-02
Finally the scientists are catching up. This has seemed obvious to me for years. More heat means more energy in the atmosphere. That will increase: wind speeds, capacity of the air to hold water, and evaporation rate of free water. All that water vapour will eventually fall when it becomes more than a particular part of the sky can hold, in a domino effect by molecule. Hence heavier bursts of rainfall. Alongside, there is more free water due to melting ice caps and glaciers, so as more rain falls the land it falls on stays saturated because there is so much rain and not time in between showers to drain or evaporate. More rain on saturated ground gives two flood causes - sheer volume kin places that would normally drain faster than rainfall) and additional volume into lower lying areas.

Prevention is not possible. Mitigation is only partially possible within any acceptable financial bounds. We must stop building on flood plains and in at risk areas. Fight the profit oriented house builders and planners - or make them live in the houses they build WITHOUT any publicly funded flood defences. We must accept that some existing buildings and land cannot be economically protected or insured.

When I moved house 24 and 20 years ago, we considered likelihood of flooding as a key factor in our choice of house!
1 Replies
Author: Guest
Posted: 2014-06-02
When I said prevention is not possible, I mean it is not possible to prevent rainfall. Flood protection /prevention actually only moves the problem somewhere else. All the flood protection works on the River Wharfe upstream of York only made York floods worse. And a lot of these works were only protecting flood meadows, which would have historically mitigated downstream flooding. For example the Ings and the golf course at Wetherby. People forgot that flood meadows are so fertile because every year they got new sediment deposited, meaning less or no fertiliser needed. Reply
Author: Guest
Posted: 2016-05-06
Really interested in the changes this piece went thru to the finish. Can you give me more insight on the 162circles’ in the wave part? Glistening water, or stylized waves, or……. ? Thanks. Reply


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