Application Of Channel Stability Methods Case Studies

Application of Channel Stability Methods

Application of Channel Stability Methods - Case Studies

The analytical method presented herein, developed through the Flood Control Channels Research Program, is intended for use to estimate channel dimensions for preliminary design studies. It accounts for the movement of sediment and for varying roughness due to changing bed forms. It also attempts to account for the effects of bank roughness that can be significant in small channels and is essentially neglected in many approaches that assume wide channels. This analytical approach determines dependent design variables of width, slope, and depth from the independent variables of discharge, sediment inflow, and bed material composition. It is especially applicable to small streams because it accounts for transporting the bed material sediment discharge in the water above the bed, not the banks, and because it separates total hydraulic roughness into bed and bank components. A stability analysis can be done by first determining the bed material sediment load entering the project reach, and then analyzing the family of slope-width solutions that satisfy the resistance and sediment transport equations. The resulting stability curve provides many combinations of slope and base width, all of which will be stable for the prescribed channel design discharge. Combinations of width and slope that plot above the stability curve will result in degradation, and combinations below the curve will result in aggradation. The greater the distance from the curve, the more severe the instability. Alluvial streams, Sedimentation, Flood- control channels, Stability analysis, Sediment transport, Stable channels.

Scour and Erosion

Scour and Erosion includes four keynote lectures from world leading researchers cutting across the themes of scour and erosion, together with 132 peer-reviewed papers from 34 countries, covering the principal themes of: - internal erosion - sediment transport - grain scale to continuum scale - advanced numerical modelling of scour and erosion - terrestrial scour and erosion- river and estuarine erosion including scour around structures, and - management of scour/erosion and sediment, including hazard management and sedimentation in dams and reservoirs. Scour and Erosion is ideal for researchers and industry working at the forefront of scour and erosion, and has applications in both the freshwater and marine environments.