Mell What does the Bradshaw model tell us?
The Bradshaw Model is a geographical model which describes how a river’s characteristics vary between the upper course and lower course of a river. It shows that discharge, occupied channel width, channel depth and average load quantity increases downstream.
Why does a river get deeper as it goes downstream?
As a river flows downstream, its velocity increases. The speed increases due to the fact that more water is added from tributaries along the course of the river. The larger mass of water causes wider and deeper water channels in order to allow water in the river to flow more freely.
Who created the Bradshaw model?
Schumm
The Origins of the Bradshaw Model Schumm based his model on an empirical analysis of a variety of North American rivers and suggested that it could be used to predict how any given river channel would respond to changes in discharge or sediment supply caused by river engineering, such as a dam or flood relief channel.
How do rivers change shape?
The process whereby water moves sediment from one location to another is called erosion. Much like their stream models, as a stream continues to flow, it carries more and more sediment away, changing the shape of the stream.
What would lead to a wider deeper river channel quizlet?
The river valley is much wider than the channel that flows through it because the channel moves and migrates back and forth, eroding the sides of the valley over time and making it wider and wider.
What causes a river to change?
Rivers changing direction is relatively common, according to the scientists, but is usually caused by tectonic forces, landslides or erosion. “The water was somewhat treacherous to approach, because you’re walking on these old river sediments that were really goopy and would suck you in.
Does a river ever end?
Rivers eventually end up flowing into the oceans. If water flows to a place that is surrounded by higher land on all sides, a lake will form. If people have built a dam to hinder a river’s flow, the lake that forms is a reservoir.
How does the Bradshaw model of a river work?
The Bradshaw Model shows the changes that occur as a river flows from its source to its mouth. A cross profile is a cross section of a river’s valley and channel. A – as the river flows downhill there is an increase in vertical erosion.
What kind of theory is the Bradshaw model?
The Bradshaw model is a theory which shows how the size of the river affects stream flow.
What makes a cross profile of a river?
A cross profile is a cross section of a river’s valley and channel. A – as the river flows downhill there is an increase in vertical erosion. The channel is shallow and narrow because there is not a lot of water in the channel. B – as the river flows into the middle course, there is some vertical erosion but more lateral erosion.
How are parameters expected to change as you follow a river?
The Bradshaw model (Figure 1) predicts how these parameters are expected to change as you follow a river from source to mouth. Why do these changes occur?