Environmental Impact on Mine Hunting in the Yellow Sea Using the CASS/GRAB Model
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The purpose of this work is to determine the necessity of a near real time ocean modeling capability such as the Naval Oceanographic Offices NAVOCEANO Modular Ocean Data Assimilation System MODAS model in shallow water such as the Yellow Sea mine hunting applications using the Navys Comprehensive Acoustic Simulation SystemGaussian Ray Bundle CASSGRAB model. Sound speed profiles inputted into the CASSGRAB were calculated from observational MOODS and climatological GDEM data sets for different seasons and regions of four different bottom types sand, gravel, mud, and rock. The CASSGRAB model outputs were compared to the outputs from corresponding MODAS data sets. The results of the comparisons demonstrated in many cases a significant acoustic difference between the alternate profiles. These results demonstrated that there is a need for a predictive modeling capability such as MODAS to address the Mine Warfare MIW needs in the Yellow Sea region. There were some weaknesses detected in the profiles the MODAS model produces in the Yellow Sea, which must be resolved before it can reliably address the MIW needs in that region.
- Land Mine Warfare