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Naval Academy, United States

Chu P.C.,Naval Ocean Analysis and Prediction Laboratory | Miller S.E.,Naval Ocean Analysis and Prediction Laboratory | Hansen J.A.,U.S. Navy
Journal of Defense Modeling and Simulation | Year: 2014

Fuel conservation and carbon reduction are important issues in current naval operations. Optimal ship route (i.e. minimum fuel consumption) depends on specific ship platform characteristics and near real-time environment such as weather, ocean waves, and ocean currents. The environmental impact of shipping can be measured on different spatial and temporal scales. As a vital component of the smart voyage planning (SVP) decision aid, the US Navy’s meteorological and oceanographic (METOC) forecast systems play an important role in optimal ship routing, which enables fuel savings in addition to the aid of heavy weather avoidance. This study assesses the impact of METOC ensemble forecast systems on optimal ship route. Tests of the SVP decision aid tool are also conducted for operational fleet use and concept of operations for the USS Princeton guided missile cruiser (CG)-59 in a sea trial test following the 2012 Rim of the Pacific exercises. © 2014 The Authors. Source

Chu P.C.,Naval Ocean Analysis and Prediction Laboratory | Hsieh C.-P.,Naval Ocean Analysis and Prediction Laboratory
Marine Technology Society Journal | Year: 2010

Internal solitary waves (ISWs) were observed on 07:52-09:36 GMT July 30, 2005, in the Philippine Sea near Taiwan from high-resolution temperature sampling. The effect of ISWs on acoustic propagation was identified using the Navy's Comprehensive Acoustic Simulation System through comparison between rangeindependent and range-dependent sound speed profiles. The ISWs enhance the sound propagation slightly (0-3 dB) in near-range, weaken or enhance the sound propagation (-20 to 20 dB) evidently in midrange, and always weaken the sound propagation (up to -20 dB) in far range. The ISW's effect on the acoustic propagation varies with sound frequency and sound source depth. This work provides a methodology to anticipate possible errors in transmission loss estimation in an operational framework, if no further additional data are available. Source

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