All administration, supervision, authority and responsibility under this article and operations conducted hereunder, vested in the Alabama State Docks Department, shall be in addition to all power, duties and authority conferred on such department by this title or conferred pursuant to sections 33-1-1, 33-1-11 and 31-1-12, the intent of this article being that the authority, powers, responsibilities and duties imposed by this article shall be in addition to and supplemental to the powers, authority, responsibilities and duties conferred or imposed on said department by any other laws of this state.