Geoffrey W. Cowles

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[1] Physical mechanisms for the summertime offshore detachment of the Changjiang Diluted Water (CDW) into the East China Sea are examined using the high-resolution, unstructured-grid, Finite-Volume Coastal Ocean Model (FVCOM). The model results suggest that isolated low salinity water lens detected west of Cheju Island can be formed by (1) a large-scale(More)
[1] Twin experiments were made to compare the reduced rank Kalman filter (RRKF), ensemble Kalman filter (EnKF), and ensemble square-root Kalman filter (EnSKF) for coastal ocean problems in three idealized regimes: a flat bottom circular shelf driven by tidal forcing at the open boundary; an linear slope continental shelf with river discharge; and a(More)
Non-oscillatory discretization methods based on the Local Extremum Diminishing principle, which were originally devised for compressible flow, are applied to the free-surface evolution equation. More specifically, both symmetric and upstream limited schemes are utilized in the calculation of the flow about the Series 60 hull, a naval frigate hull with sonar(More)
  • Citation Chen, P Malanotte-Rizzoli, J Wei, R C Beardsley, Z Lai, P Xue +15 others
  • 2009
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. [1] Twin experiments were made to compare the reduced rank Kalman filter(More)
Executive Summary Under contract with Massachusetts Water Resources Authority, the University of Massachusetts Dartmouth's Marine Ecosystem Dynamic Modeling team conducted model simulations for the Massachusetts Bay system. These models simulate the water motion (hydrodynamics) and the biologically-driven changes in carbon and nutrients (water quality) of(More)
Diagonal preconditioners for implicit-unsteady and steady discretizations of the shallow water equations at low-and high-Rossby and drag-number limits are analyzed. For each case, sub and supercritical flow conditions are also considered. Based on the analysis, a preconditioner is derived for use with a multigrid cycle that performs as well as possible(More)
(400 words or less) We propose to develop a Northeast regional state-of-the-art coupled Atmosphere/Ocean Model System (NEAOMS) for the Gulf of Maine/Mid-Atlantic Bight region (Scotian Shelf-Cape Hatteras) to study the coupled atmosphere/ocean behavior under a variety of conditions. NEAOMS will feature four core models: (a) the next-generation Weather(More)
– The scientific activity in the CFD laboratory in the Department of Mechanical and Aerospace Engineering at Princeton is centered on the development of advanced computational simulation techniques in the aerodynamic design of modern aircraft, and the prediction hydrodynamic performance of ships. Computer codes based on on both structured body-fitted meshes(More)
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