verificação de elevação de nível de canal, Exercícios de Hidráulica

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If the constricted width at a certain section is 3 m, wha

water surface elevation?

(Assume horizontal transition and frictionless flow)

/s at a depth of 2.5 m.

on is 3 m, what will be the change in the

Equations the channel at upstream section B1 (m) 4 ed width of the channel B2 (m) 3 Depth at constricted sec upstream section y1 (m) 2. 18 t upstream section V1 (m/s) 1. umber at upstream section F1 0.363 Do choking conditions ex Subcritical Elevation Drop Will the upstream depth nergy at upstream section E1 (m) 2.665 If choking conditions do If choking conditions exis Specific Energy at constr Minimum width B conveyed in the channel Q (m^3 /s) Constricted width given Is constricted width B2 < the minimum width that does not cause choking e rectangular channel carries a discharge of 18 m^3 /s at a depth of 2.5 m. stricted width at a certain section is 3 m, what will be the change in the water surface elevation? horizontal transition and frictionless flow)

Solution 1: If choking conditions do not exist, use this solution Equations

Specific energy at constricted section E2 (m) 2.665 E2 = E Use Solver to obtain the value of depth y2 at constricted section Specifc energy at constricted section E2(m) 2. Depth at constricted section y2 (m) 2. Change in elevation (m) 0. Discharge per unit width at upstream section q1 (m^3 /s/m) Discharge per unit width at constricted section q2 (m^3 /s/m)

Solution 2: If choking conditions exist, use this solution

6

Specific energy at critical depth Ec2 (m) 2. Specific energy at upstream section E1' (m) 2. Use Solver to obtain the value of depth y1' at upstream section Specific energy at upstream section E1' (m) 3. Depth at upstream section y1' (m) 2. Depth at the constricted section y2 (m) 1. Discharge per unit width at upstream section q1 (m^3 /s/m) Discharge per unit width at constricted section q2 (m^3 /s/m) Critical depth at the constricted section yc2 (m)

Constricted width = 3.0 m Constricted width = 2.0 m y1 = 2. y1 = 2. y2 = 2.326 m y2 = 2.021 m

2 = 2.326 m y2 = 2.021 m