Turbulence Modeling of Surface Water Flow and Transport: Part IV

The fourth in a five part series, this paper discusses the computer, numerical, and personnel requirements for turbulence model based surface water codes. The paper concludes with a brief discussion on suggested evaluation procedures for turbulence models. Hardware resources typically require substantial computing resources particularly for the case of time varying calculations. For the case of 3D flows, the solution of extra equations for turbulence quantities will not add much extra time to the calculation. Codes may be developed or acquired with acquisition of public domain software or proprietary codes possible. Public domain software is often not well‐documented but is inexpensive. Proprietary software is generally more expensive but well‐maintained and documented. The development of a code requires trained personnel, considerable computer resources and a sound numerical solution approach. Seven components or considerations in the numerical solution approach are discussed with the treatment of the advection terms being of considerable importance. Finally, six elements of model performance evaluation are summarized and include a discussion of the types of data for such evaluations.