Source : Webster's Revised Unabridged Dictionary (1913)

Shelvy \Shelv"y\, a.
   Sloping gradually; shelving.

         The shore was shelving and shallow.      --Shak.

Source : WordNet®

shelvy
     adj : full of submerged reefs or sandbanks or shoals; "reefy
           shallows"; "shoaly waters" [syn: {reefy}, {shelfy}, {shoaly}]