Patent ID: 7669481

Claim:
A system for monitoring level variations of at least one bottom region ( 20 ) of a soil subjected to erosive and sedimentary agents, which comprises at least one monitoring element ( 15 ) secured to said bottom region ( 20 ) ,said at least one monitoring element ( 15 ) comprising sensor means ( 120 ) to detect a response (|u x |) of said at least one monitoring element ( 15 ) with respect to a stress (f s ), wherein said stress (f s ) is applied to said monitoring element ( 15 ) to determine vibrations originating displacements (|u x |) of at least part of said at least one monitoring element, said response detected by said sensor means is a function of said displacements (|u x |) of at least part of said at least one monitoring element ( 15 ) and that means ( 150 ) are provided for analysing said response with respect to a stress (f s ) applied to said monitoring element ( 15 ), identifying in said response characteristic frequencies (λ i *) of the displacements of said monitoring element ( 15 ) and correlating said characteristic frequencies (λ i *) with a lowering (Δl p ) of said bottom region ( 20 ) .