Anodes at wharfs or steel pilings are considered what kind of anode?

Anodes at wharfs or steel pilings are considered distributed anodes because they are typically installed around a structure to provide a protective electric field over a broader area. Distributed anodes are utilized in environments where large surfaces require cathodic protection, as they help evenly distribute the protective current, minimizing localized corrosion. By using multiple anodes instead of focusing protection on a singular point, the cathodic protection system can effectively safeguard extensive structures like wharfs and steel pilings against corrosion. This setup takes into account the large surface area and unique requirements of marine environments, ensuring that all parts of the structure receive adequate protection from corrosion.