Characterization of rainfall runoff quality from shipyard drydocks

摘要

Shipyard (floating) drydocks are sites of intensive industrial activity in the construction, repair, and maintenance of ships. Because of the location of floating drydocks in a waterway and their regular submersion below the water surface, materials located on the surface of a dry-dock can potentially be washed into the surface water. While shipyards are careful to clean dry-dock surfaces prior to submersion, there is the potential for wash-off of materials from the drydock surface during periods of rainfall. Runoff is generally quickly generated because the drydock surface is impermeable and the runoff volume can be significant, given the area of drydocks can exceed several acres. Although runoff occurs from the surface of drydocks during and following rainfall events, little is known about the composition of this runoff, and what variables control its composition.