Geographical theory

• the bradshaw model is several graphs on one axis and shows what happens to the river from source to mouth in theory
• the bradshaw model suggests that discharge increases substantially, and average velocity increases, as well as width and depth
• the bradswaw model is good because, with more water, there will be less of the river in contact with the bed and banks, and therefore less friction
• the bradshaw model indicates that there are several factors that will change with distance downstream
• based on the bradshaw model, we expected to see the river getting wider, deeper and faster with distance downstream
• the hjulstrom curve shows the relationship between velocity and the river processes of erosion, transportation and deposition
• the hjoulstrom curve shows that for the majority of particles, the larger the particle, the faster the water needs to travel in order to erode it and transport it
• in theory, the larger particles will be where there is slower velocity and only smaller particles where velocity is faster
• the hjulstrom curve suggests there would be a slower velocity and larger particles in the upper course