666) a) In the standard step method, gradually varied flow is assumed. Explain i
ID: 1710837 • Letter: 6
Question
666)
a) In the standard step method, gradually varied flow is assumed. Explain in which part of the standard step method calculation is this assumption used.
b) Once a solution is obtained using the standard step method, explain how to check if the gradually varied flow assumption has been maintained.
c) Explain the rquired characteristics of the flow and channel to meet the uniform flow assumption.
d) State which of the three flow gradienst, So, Sf, and Sw, is used in uniform flow calculation. State why this form of calculation is polular despite the obvious innacuracy of the solution.
e) Show how the Manning's equation is used in the standard step method.
Explanation / Answer
Hi,
Plz give thumbs up.
The standard step method is a computational technique utilized to estimate one Dimensional surface water profiles in open channels with a assumption that the flow is gradually varying.The Gradually vRYING FLOW IS ASSUMED IN CAse of steady state conditions.It also uses a combination of the energy , momentum and continuity equations to determine the depth of water for a given friction slope, channel slope and geometry.
For the GVF, the depths calculated for various values of steps of h can be compared with other method or modelling and the results can be compared.Also we have curve profiles for various conditions which can be compared with the actual curve profiles obtained.
Uniform flow describes a situation where the flow depth does not change with the distance along the channel and that this can only occur in a smooth channel that do not experience any changes in the flow,roughness or channel slope.During uniform flow , the flow depth is known as normal depth.
For uniform flow, Sf ( slope due to friction ) is considered. Mannings formula is popular for calculation of velocity and discharge thoug it is not that accurate.
Mannings formula is used as - sf = [n2V2] / [C2R4/3]
where n = mannings coefficient
V = velocity of fluid
R= hydraulic radius
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.