This paper describes a successful two week multi-disciplined multi-organizational effort to adapt an existing waterborne transport model, SHARC (System for the Hazard Assessment of Released Chemicals) developed by Applied Science Associates for use during Operation Tomodachi. This effort represents the use of state-of-the-art S&T tools and subject matter expertise to provide urgent decision-support information to the United States Forces Japan (USFJ) Commander. Ocean environmental data were provided by Navy Oceanography Office (NAVOCEANO), Naval Oceanographer Anti-Submarine Warfare (ASW) Center (NOAC), at Stennis, MS. Off-shore sensor data from TEPCO and Ministry of Education, Culture, Sports, Science & Technology (MEXT) were used to benchmark the hazard predictions for I-131, Cs-134 and Cs-137. Department of Energy Federal Radiological Monitoring and Assessment Center (FRMAC) aerial monitoring data were used to validate general tidal features of the transport of radioisotopes. Waterborne hazard estimates addressed the 7th Fleet's operating environment concerns and potential for contamination of shipboard potable water. Various levels of concern, based on EPA standards for drinking water, were developed in collaboration with USFJ.
The waterborne transport capability was based on Dai-ichi facility run-off water contamination. Ground deposition (especially from the NW corridor) may have contributed to significant hazards from water run-off from the larger Japanese watershed/infrastructure. A proof-of-concept integration of SHARC and Incident Commander Water (IC Water) was demonstrated in an effort to account for sources of radioactivity removed from Dai-ichi. IC Water models airborne and direct deposition onto estuaries, ground and water treatment networks. IC Water output is used as a source term input to the SHARC ocean transport; however, these integrated models were not used for operations because watershed/river sensor data either did not exist or were not available for benchmarking these models