[FoRK] Drilling for freshwater
sdw at lig.net
Mon Dec 9 11:27:05 PST 2013
Well that's interesting.
If accessible, pretty much solves the freshwater problem for some key areas.
Scientists discover huge freshwater reserves beneath the ocean
Scientists discover freshwater under the ocean.
Scientists discover freshwater under the ocean. Source: ThinkStock
SCIENTISTS have discovered vast reserves of fresh water located deep
beneath the ocean that could prevent a global water crisis.
A new study published this month reveals that an estimated half a
million cubic kilometres of low-salinity water are buried beneath the
seabed on continental shelves around the world.
The water is located off the coast of Australia, North America, China
and South Africa, reports Science Daily.
"The volume of this water resource is a hundred times greater than the
amount we've extracted from the Earth's sub-surface in the past century
since 1900," says lead author Dr Vincent Post of the National Centre for
Groundwater Research and Training (NCGRT) and the School of the
Environment at Flinders University.
Dr Post says that while scientists knew of freshwater under the sea
floor, they thought it only occurred under rare and specific conditions.
"Fresh water on our planet is increasingly under stress and strain so
the discovery of significant new stores off the coast is very exciting.
It means that more options can be considered to help reduce the impact
of droughts and continental water shortages," Dr Post said.
These reserves were formed over the past hundreds of thousands of years
when on average the sea level was much lower than it is today, and when
the coastline was further out, Dr Post explains.
"So when it rained, the water would infiltrate into the ground and fill
up the water table in areas that are nowadays under the sea.
"It happened all around the world, and when the sea level rose when ice
caps started melting some 20,000 years ago, these areas were covered by
the ocean," he said.
Dr Post says that these aquifers (underground layers of water) are
protected from seawater by the layers of clay and sediment that sit on
top of them.
The aquifers are similar to the ones below land, which much of the world
relies on for drinking water, and their salinity is low enough for them
to be turned into portable water.
So how can we collect this hidden water source?
"There are two ways to access this water - build a platform out at sea
and drill into the seabed, or drill from the mainland or islands close
to the aquifers."
But Dr Post also has cautions for the countries closest to the
non-renewable freshwater deposits, saying that we should take care not
to contaminate the seawater and subsequently the aquifers.
"We should use them carefully - once gone, they won't be replenished
until the sea level drops again, which is not likely to happen for a
very long time."
More information about the FoRK