windbreaks built from volcanic rock

As I drove down from Famara toward the salt works, I passed mile after mile of small semi-circular windbreaks built from volcanic rock.  The windbreaks surround one side of a dell dug from the pecan. 

The dells and windbreaks are to protect individual grape vines.

The uniformed rows stretch from the road in all directions and in most cases continue up the sides of the old sleeping volcanos.

The grapes produce a selection of wines which in my experience taste ok and do the job at a reasonable price.

The shapes are interesting to look at and I am told this method is distinct to the islands in this part of the world.

I can't help reflecting on how long each basin and windbreak must have taken to create initially and then would love to know how many centuries have passed with this method being adopted. 

Answers on a postcard please.