The velocity of the river in the meandering channel below is the fastest at...

1.14 Velocity in the meandering channel

In a meandering river channel, velocity is lowest at the inner (concave) bank due to higher friction and deposition, and highest at the outer (convex) bank due to superelevation and less friction.

From the diagram, the flow velocity (m/s) indicators show:

• Inner bend: low velocity (e.g., labeled 2)
• Outer bend: high velocity (e.g., labeled 4)

Highest velocity at the outer bend (point B or corresponding label).

1.15 Discharge $D$ in the river

Discharge $D$ (volume flow rate) is given by the formula:

$$D = A \times v$$

where:

• $A$ = cross-sectional area of flow (m²)
• $v$ = average flow velocity (m/s)

Units: m³/s.

$D$ depends on both cross-sectional area and average velocity at the point.

From diagram options:

(a) (or corresponding): $D = A \times v$

1.16 Mouth of the river on the longitudinal profile

The longitudinal profile shows elevation decreasing from source (left, high) to ocean (right, low).

P is near the source (steep gradient).

The mouth (where river meets sea) is at the ocean end.

A ved havet

1.17 (Assuming standard follow-up: Where is gradient steepest?)

Gradient (slope) is steepest near source.

D ved P (or corresponding point near source).

1.18 (Assuming: Where is discharge greatest?)

Discharge increases downstream as tributaries add water.

Greatest at mouth/ocean.

A ved havet