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DISCHARGE ASSESSMENT FOR TWO STAGE MEANDERING AND STRAIGHT COMPOUND CHANNELS
Discharge characteristics of compound sections composed of a rectangular main channel and one or two floodplains disposed off to its sides are analysed. A set of smooth and rough sections is studied with aspect ratio varying between 2 and 5. The assumed vertical, diagonal, and horizontal interface plains are used to separate the compound channel section to subsections, the discharge for each subsection are calculated using Manning's equation. These subsection discharges are then added to give the total discharge carried by the meandering and straight compound channels. However, all these interface planes give results that are different from the observed values. A variable-inclined interface is proposed for which apparent shear force is calculated as close to zero. Equations are presented giving proportion of discharge carried by the main channel and floodplain. The equations agree well with experimental and river discharge data. Using a variable-inclined interface, the error between the measured and calculated discharges for the meandering compound sections is found to be the minimum when compared to that using other interfaces.
DISCHARGE ASSESSMENT FOR TWO STAGE MEANDERING AND STRAIGHT COMPOUND CHANNELS
Discharge characteristics of compound sections composed of a rectangular main channel and one or two floodplains disposed off to its sides are analysed. A set of smooth and rough sections is studied with aspect ratio varying between 2 and 5. The assumed vertical, diagonal, and horizontal interface plains are used to separate the compound channel section to subsections, the discharge for each subsection are calculated using Manning's equation. These subsection discharges are then added to give the total discharge carried by the meandering and straight compound channels. However, all these interface planes give results that are different from the observed values. A variable-inclined interface is proposed for which apparent shear force is calculated as close to zero. Equations are presented giving proportion of discharge carried by the main channel and floodplain. The equations agree well with experimental and river discharge data. Using a variable-inclined interface, the error between the measured and calculated discharges for the meandering compound sections is found to be the minimum when compared to that using other interfaces.
DISCHARGE ASSESSMENT FOR TWO STAGE MEANDERING AND STRAIGHT COMPOUND CHANNELS
Patra, Kanhu Charan (author)
ISH Journal of Hydraulic Engineering ; 11 ; 125-140
2005-01-01
16 pages
Article (Journal)
Electronic Resource
Unknown
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