Tuesday, Nov 30, 2004 at 12:47
I am far from being a specialist, no doubt. This is why I cannot help wondering if it is not falsely believed that land salination comes as a result of forest destruction. Cannot it be a result of blind random boring onshore of the littoral aquifer?
Groundwater pumping may lead to lower the level of the hydraulic charge and facilitate the infiltration of salt
water through breaks into the geological formations. In general, seawater occupies part of the aquifer close to the littoral, according to the head of soft
water, the refill of the aquifer and the permeability. Any significant modification of the aquifer by taking away excessive amount of
water breaks the balance and causes an intrusion of salt.
In the case of the exploitation of karstic aquifer littorals it is even more difficult because of the existence of open conduits which sometimes means that seawater can penetrate very easily. Besides, conduits are organized as underground networks. Tapping randomly the aquifer on the littoral with blind drillings presents a heavy risk of contamination of the whole system by intrusion of salt
water. Any disturbance is likely to insert the seawater deeply in the aquifer.
Then, it probably turns to be far less hazardous and perfectly safe (with an uninterrupted monitoring of salinity) to tap fresh
water directly at its source (which is usually the converging point of various conduits) even if it is located under the sea level offshore, than to try to identify a tiny part of its conduits onshore and risk to contaminate the entire underground system.
Actually the process is successfully developed in the Mediterranean basin, and I would like SA VIC and WA government to implement it now!
Sorry, it was a bit long. But NOW: could anyone help me at locating a high potential zone of exploration! and after have a bite!
(by the way. the above is copyrighted!... and the process is patented!...)
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