River valley
Viewing from the transverse section of river valley, it can be divided into valley bottom and valley slope.

Valley bottom: includes river bed and flood plain.

River bed: the valley bottom part of river valley where the water flow occupies during dry season.

Flood plain: the valley bottom part submerged during flood period of river apart from the river bed.

Valley slope: bank slopes on the two sides of river valley, and terrace is often developed.

Shoulder (valley edge): the intersection between valley slope and original moutain slope or ground.



Cross section structure of river valley
1. River bed; 2. Flood plain; 3. Valley slope; 4. Terrace; 5. Shoulder (valley edge)
—Low water level; --- Flood level