January 2023
River Regime
The river Nile. Image credit historymuseum.ca ZIMSEC O Level Geography Notes: River Regime
- A river regime is the term used to describe the annual variations in a specified river’s discharge.
- A river’s discharge is the volume of water flowing through a river channel.
- This is the total […]
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River processes: Basic Concepts
A turbulent river. Image credit jokeroo.com ZIMSEC O Level Geography Notes: River processes:Basic Concepts.
- Rivers are perhaps the most important denudation agent.
- They carve channels, form valleys,transport and deposit regolith over great distances and other material to form other types of landforms.
Terms used in describing a […]
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River rejuvenation
Paired terraces resulting from rejuvination. Image credit Geographyas.info ZIMSEC O Level Geography Notes: River Rejuvination
- Rejuvenation-occurs when there is a negative change in a river’s base level (i.e. when the river’s base level falls) which increases its potential energy and thus enables it […]
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River Erosion
River erosion. Image credit Internationalarchives.org ZIMSEC O Level Geography Notes: River Erosion
- River erosion involves the wearing away of rock and soil found along the river bed and banks.
- It also involves the breaking down of the rock particles being carried downstream by the river.
- There are four […]
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Drainage Patterns
Image credit fanshare.com ZIMSEC O Level Geography Notes: Drainage Patterns.
- Drainage pattern is a term that refers to the way in which a river and its tributaries arrange themselves in the drainage basin.
- The drainage pattern evolves over a long period of time and is affected by such factors […]
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River transportation processes
River transportation processes. Image credit BBC. ZIMSEC O Level Geography Notes: River Transportation Processes.
- Any energy left after a river has overcome friction is used to transport sediment.
- This energy varies directly with a river’s discharge, velocity and turbulence
- That is if they increase the amount of […]
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Drainage Basin
The drainage basin. Image credit BBC. ZIMSEC O Level Geography Notes: Drainage Basin
- The term drainage basin refers to an area of land drained by a river and its tributaries (river system).
- It includes water found in the water table and surface run-off.
- The drainage basin is also known […]
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River Deposition
River deposition (left bank). Image credit Panoramio. ZIMSEC O Level Geography Notes: River deposition
- Deposition occurs when a river no longer as sufficient energy to transport its load.
- When its velocity begins to fall and has less energy, a river’s competence (maximum size of material […]
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Surface Water flow and the origin of rivers
Natural Springs contribute their water to rivers and often form the source of rivers. Image credit paintballfun.com ZIMSEC O Level Geography Notes: Surface Water Flow and the Origin of rivers
Surface water flow and […]