The fourth in a series of reports describing the development of a three-dimensional finite-difference water-flow model for estuaries and coastal seas. The present report introduces a significant change in the computational method which removes the most critical stability condition and makes the computation more stable. In addition, a computation of the subgridscale energy is introduced by which turbulence closure is obtained. (See also R-1417, R-1884, R-2188.)
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