USS ARIZONA MEMORIAL
Submerged Cultural Resources Study:
USS Arizona and Pearl Harbor National Historic Landmark
Chapter IV: Biofouling And Corrosion Study
Until the joint National Park Service (NPS) and Navy mapping survey in 1983, no major assessment of the USS ARIZONA had occurred since salvage activities after the ship's sinking in 1941. The five-year project contained many facets in its search for information relevant to long-term management of submerged components of the Pearl Harbor National Historic Landmark, especially the USS ARIZONA and the USS UTAH. The July 1986 study examined, among others, one particular aspect of the ship: the role of biofouling in the overall corrosion process. This chapter discusses the methodology and presents the results of that biofouling and corrosion study. Although some comparative data was taken from the USS UTAH, this research focused almost exclusively on the USS ARIZONA.
Our objectives were to: 1) develop a baseline inventory of biological communities and sedimentation extant on structural remains of the ship, and 2) obtain quantifiable measurements of the present state of deterioration of the ship's metal structural elements at various locations (ref. 1). The data gathered would then be used to assess the causes and rates of deterioration of the ship components, and would subsequently provide a scientific basis for making informed decisions regarding the ARIZONA's management and preservation. These objectives do not imply a commitment by federal managers to undertake stabilization of deterioration or in-place preservation (ref. 1).
Several working hypotheses pertaining to the ship's biofouling and corrosion status were formulated prior to the survey to define specific data requirements.
Hypotheses related to vertical ship surfaces were:
Hypotheses related to horizontal (wood and steel) ship surfaces were:
Two other hypotheses were formulated concerning possible long-term effects on biofouling communities:
Last Updated: 27-Apr-2001