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<br />24 <br /> <br />6. Data Requirements: <br />FLUVIAL-II requires the following input data: <br /> <br />(1) Number of cross sections and individual reach lengths. <br />(2) Tributary locations. <br />(3) Flood hydrographs for main and tributary streams. <br />(4) Downstream boundary conditions. <br />(5) Cross-section geometries of all computational sections and Manning's <br />n at each cross section. <br />(6) Initial bed-material sediment compositions for the upstream and <br />downstream ends. Sediment compositions at intermediate cross <br />sections are computed using an exponential decay relationship. <br />(7) Description of channel bends, if any, by their radii of curvature. <br /> <br />7. Model Limitations and Applicability <br /> <br />The use of FLUVIAL-II is limited to a modeling reach for which the one- <br />dimensional flow approximation is applicable. However, the model can predict <br />changes in erodible channel width, changes in channel-bed profile, and lateral <br />migration of a channel in bends. <br /> <br />F. SEDIMENT-4H: <br />1. Developer: Ranjan Ariathurai (Resource Management Associates), 1977 <br />2. Previous Applications: <br />(1) The Osage River, Missouri (Ariathurai, 1980) <br /> <br />3. Basic Concepts: <br /> <br />The model was developed for simulating two-dimensional, gradually-varied, <br />unsteady, water and sediment flows. The model utilized in the present study, <br />however, is a one-dimensional version of SEDIMENT-4H. The principal <br />assumptions employed in this model are as follows: <br />