River System Overview
This diagram provides a comprehensive view of a river system, showcasing its key components and how they change from source to mouth. The illustration is divided into three main sections: the upper course, middle course, and lower course of the river.
In the upper course, we see the source of the river, typically located in highland areas. This section is characterized by steep gradients and narrow channels.
Vocabulary: The watershed is the highland area surrounding the river basin, determining the area from which water drains into the river system.
As we move downstream, tributaries join the main river channel at points called confluences. These smaller streams contribute to the increasing volume of water in the main river.
Definition: Tributaries are smaller streams or rivers that flow into and join a larger river.
The middle course of the river shows a gentler gradient with the beginning of meanders. The river channel becomes wider and deeper in this section.
Highlight: The cross profile of a river changes significantly from the upper to the lower course, reflecting the river's changing dynamics.
In the lower course, the river widens considerably, and the surrounding landscape becomes flatter. This section is characterized by a wide floodplain and slower flow.
Vocabulary: The river mouth is where the river meets the sea or another large body of water, marking the end of the river's journey.
The diagram also illustrates the concept of a river basin, which encompasses the entire area drained by the river and its tributaries.
Example: The Amazon River basin is one of the largest in the world, covering about 40% of South America.
This comprehensive diagram serves as an excellent educational tool for understanding river systems, making it valuable for students studying geography at various levels, from KS2 to GCSE and beyond.
