River Hydraulics

River hydraulics studies the flow of water in natural channels. The concept of regime theory relates flow characteristics to channel geometry. Sediment transport is the movement of particles by flowing water. The shield's criterion determines when sediment begins to move. Meandering rivers have sinuous channels influenced by erosion and deposition. Flood routing predicts flood wave movement through a river reach. Manning's equation is used for river flow calculations.

Governing FormulaManning: Q = (1/n) × A × R^(2/3) × S^(1/2), Critical velocity for sediment: V_c = C × √(y × d)

Knowledge Check

10 Questions

1.A river has a width of 50 m, average depth of 3 m, and velocity of 1.5 m/s. What is the discharge?

2.What is a meandering river?

3.The Shield's criterion is used to determine:

4.A river reach has a length of 5 km and the water surface elevation drops by 2.5 m. What is the slope?

5.Flood routing is used to:

6.In regime theory, the width of a river is related to the discharge by:

7.What is the main agent of sediment transport in a river?

8.A river has a Manning's n = 0.035, hydraulic radius R = 2.5 m, slope S = 0.0008, and cross-sectional area A = 100 m². What is the discharge?

9.The Manning's roughness coefficient (n) for a natural river is typically:

10.What causes sediment deposition in a river?