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RSIC CODE PACKAGE CCC-345

1. NAME AND TITLE

SEDONE: A Simulator of Tidal Transient Hydrodynamic Sediment Concentrations Conditions in Controlled Rivers and Estuaries.

2. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

SEDONE simulates fast-transient, one-dimensional hydrodynamic and three-layer, variable-size sediment concentration conditions in controlled rivers and tidal estuaries. The mathematical foundation of the model is based on a one-dimensional, discrete element formulation of the integral forms of the physical laws for (1) conservation of water mass, (2) second law of motion for water, and (3) conservation of sediment size-class mass. The model considers discrete-elements enclosed by the longitudinally divided segments along a river or an estuary and the approximately parallel planes that bound the three specified layers in the vertical direction consisting of (a) a stationary resident bed sediment layer, (b) a bed slurry sediment layer and (c) a suspended sediment layer. Different size classes of sediment with different physical properties can be considered.

5. METHOD OF SOLUTION

The governing mathematical model consists of a spatially discretized system of coupled, ordinary differential equations for water surface elevation and flow rate in the channel and sediment size-class concentrations in the three layers. These equations are integrated by the Runge-Kutta-Gill integration scheme from specified initial conditions.

6. RESTRICTIONS OR LIMITATIONS

A maximum of four sediment size-classes can be specified because of storage allocation within the computer code. A channel can be divided into a maximum of 76 discrete elements (77 cross sections), and a total of 31 time periods are allowed. The code can handle input from five streams that flow into the main channel. If the user wants to simulate tidal flow, a maximum of eight cosine harmonics for tidal elevation can be specified.

7. TYPICAL RUNNING TIME

The sample problem took 3 minutes to execute on the IBM 360/91.

For a 76-element channel system and a simulation time of 50 hours (with four sediment size-classes), the SEDONE code has an execution time of approximately 5 minutes on the IBM 360/91 computer. However, the code has a user-specified option to include only the simulations of sediment concentration conditions by incorporating previously computed and stored results for the surface elevation and flow rate conditions as supplementary input data, thereby excluding the computations for the solution of the hydrodynamic conditions. This option reduces the computational cost of repeated simulations which may be required in studies concerned with the comparisons of the sedimentation conditions for different classes of sediment under similar flow conditions in rivers and estuaries.

8. COMPUTER HARDWARE REQUIREMENTS

SEDONE is operable on the IBM 360/370 computers. It requires 238 K storage.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H compiler is required. The code uses standard I/O plus 11 additional logical unit assignments.

10. REFERENCE

D. M. Hetrick, A. H. Eraslan, and M. R. Patterson, "SEDONE: A Computer Code for Simulating Tidal-Transient, One-Dimensional Hydrodynamic Conditions and Three-Layer, Variable-Size Sediment Concentrations in Controlled Rivers and Estuaries," ORNL/NUREG/TM-256 (February 1979).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source codes and sample problem input and output.

12. DATE OF ABSTRACT

January 1982.

KEYWORDS: RADIONUCLIDES; ONE-DIMENSION; NUCLIDE TRANSPORT; ENVIRONMENTAL DOSE; HYDRODYNAMICS