Accession Number:

ADA426542

Title:

Mid-Ocean Ballast Water Exchange: Approach & Methods for Verification

Descriptive Note:

Final rept.

Corporate Author:

COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT

Report Date:

2004-08-01

Pagination or Media Count:

219.0

Abstract:

Ballast water management of ships entering the United States is a key component in stopping invasions of non-indigenous aquatic species. Ballast water exchange BWE is currently the most common method of ballast water management and it is likely to remain an approved management technique for the foreseeable future. The United States Coast Guards present salinity-based BWE verification procedure is ineffective when ships tanks are ballasted in high salinity ports. In an attempt to improve this procedure, a suite of parameters was sought to better discriminate between open ocean and coastal waters. Analyses indicated that salinity, colored dissolved organic matter CDOM, certain trace metals, and radium isotopes provided good discrimination power. Univariate and multi variate analyses conducted on the separate and combined data sets indicated that radium was the best single discriminator and that salinity coupled with six trace metals barium, manganese, phosphorus, molybdenum, uranium, and vanadium was the most successful suite for discriminating open ocean from coastal water. CDOM combined with salinity proved to be a successful discriminator. Water clarity and phytoplankton salinity tolerance proved unsuitable. Sampling and analysis procedures are included in the report.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry
  • Radiation and Nuclear Chemistry
  • Physical and Dynamic Oceanography
  • Marine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE