![]() ![]() The simulated channel does not account for debris because the model assumes unobstructed flow. This assumption is only valid at locations where flow is parallel to the main channel or where vertical velocities are not significant. This 1D model assumes that energy is uniform in a cross section. The HEC-6 model uses the standard step method (Chow, 1959) to determine changes in water-surface elevations from one cross section to the next by balancing total energy head at the sections. In areas where flow velocity is changing rapidly, the gradually varied flow assumption requires the use of closely-spaced cross sections. HEC-6 is a computer program that analyzes 1D, gradually varied, steady flow in open channels with movable boundaries due to scour and deposition (U.S. The actual flow distance on the SF is 1.6 mi therefore, the total model length is 36.6 mi. The modeled reach extended from Enaville on the NF to Springston, about 1.5 mi upstream of the Coeur d’Alene River inlet to the lake-an actual flow distance of 35.0 mi. However, in this study, sediment-transport processes were simulated because the model was developed to include a movable streambed. Sediment-transport processes were not simulated in most previous modeling studies of this reach, and the streambed was assumed to be stable (fixed bed). Army Corps of Engineers, 1993) was used to construct a sediment-transport model of the Coeur d’Alene River. The HEC-6 computer model, version 4.2, (U.S. Successful models can be used to estimate water-surface elevations, flow depths, velocities, shear stresses, erosion, deposition, and sediment transport for flows of varying magnitudes and stages. The primary objective of numerical modeling was to simulate the effects of changing river discharges and lake stages in the Dudley reach on velocities, bed shear stress, erosion and deposition, and sediment mobility. Scientific Investigations Report 2008–5093īack to Table of Contents Numerical Modeling ![]()
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