River field study - River Horner
Bradshaw Model
This screen gives information on the Bradshaw Model to help you complete the activity question. It has a diagram of the model.

The Bradshaw Model suggests that Velocity, Discharge, Cross-sectional Area and Hydraulic Radius all increase with distance downstream.

As a river travels down its course from the source in the mountains to the low lying floodplains towards its mouth the nature of the valley, the channel, the flow of water and the sediment it transports all change.

These changes are reflected in the Bradshaw Model and it is some of these characteristics that this unit will consider.

Bradshaw model.This model visually details the changes that occur downstream along thecourse of a river. The size of the shaded area represent the relative change that takes place. The following factors are all seen to increase downstream (i.e. the triangular shape representing them gets wider downstream): Velocity/Discharge/ Amount of load/Cross-sectional area/ Efficiency (hydraulic radius). The following features of a river get less downstream: Channel roughness/Friction/Turbulence/Load size/Gradient.