Science · 6 pages · 12 min
Why pumping a well can pull in salt
Pumping can lower the fresh-water head that was holding denser salt water away from the well.
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From the opening
Near a coast, or near beds of salty groundwater, fresh water sits above or inland of denser salt water in a delicate balance. Pumping lowers the fresh-water pressure, and the salt water can move toward the well. The opening covers fresh water holding back a salt wedge, how a cone of depression invites salt, and what upconing does under the well.
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Inside
- Fresh water holding back a salt wedge
- How a cone of depression invites salt
- What upconing does under the well
- When the salt is not the modern sea
- Where the idea stops applying
- A distinction worth keeping
Sources
- Saltwater intrusion in coastal aquifers
- The Ghyben-Herzberg relation and upconing