8.1.5
River Deposition
Deposition
Deposition
Deposition is when the sediment that a river is transporting is dropped. This happens in the middle and lower course of the river and in lower energy conditions. The reasons why rivers lose velocity and drop material are:
River Landforms Caused by Erosion
River Landforms Caused by Erosion
![Illustrative background for Waterfalls](https://image-v2.cdn.app.senecalearning.com/2018-04/53b72bbf-2dc8-4d62-b891-9cd7bab5f0df/3.3.3%20waterfalls%20and%20gorges%20%232%20(1),h_400,q_80,w_640.png)
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Waterfalls
Waterfalls
- When a river flows over hard rock that overlays softer rock, a waterfall can form.
- The less resistant rock begins to erode by abrasion and hydraulic action.
- A step or notch forms in the softer rock, creating a river rapid.
- Over time, the softer rock is eroded more and more, whereas the harder rock is left sticking out.
- The height of the drop increases as the water pounds the less resistant rock at the base. Eventually a waterfall forms.
![Illustrative background for Waterfalls and gorges](https://image-v2.cdn.app.senecalearning.com/2018-04/ced82476-d6a4-4d14-b333-104e559a67a3/3.3.3%20waterfalls%20and%20gorges%20%233%20(1),h_400,q_80,w_640.png)
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Waterfalls and gorges
Waterfalls and gorges
- The less resistant rock starts to be eroded underneath the hard rock. This process is called undercutting.
- The overhanging harder rock collapses because it's unsupported.
- The waterfall now has harder rock to swirl around its base. The resulting abrasion creates a plunge pool.
- Hydraulic action keeps undercutting behind the waterfall.
- If the process repeats over a long time, a gorge may form.
![Illustrative background for Interlocking spurs](https://image-v2.cdn.app.senecalearning.com/2018-04/8e1500ba-ac4e-472a-aab8-eaad415c2e72/3.3.3 interlocking spurs,h_400,q_80,w_640.png)
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Interlocking spurs
Interlocking spurs
- In the upper courses of rivers, valleys are steep and V-shaped because most of the erosion that happens is in a vertical direction.
- Because the rivers don't have enough energy to erode sideways, they are restricted to winding around the hills on the valley sides.
- These interlocking hillsides are the interlocking spurs.
Landforms of Erosion and Deposition
Landforms of Erosion and Deposition
![Illustrative background for Meanders](https://image-v2.cdn.app.senecalearning.com/2018-04/c5e93c05-bd77-4644-a07b-8cf6cfa6fac5/3.3.4%20meander%20(1),h_400,q_80,w_640.png)
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Meanders
Meanders
- Erosion and deposition in parts of rivers that have deep and shallow sections lead to meanders forming.
- On the outside of bends, the deep channel means the current is fast.
- River cliffs form here because the high energy water has more erosional power.
- On the inside of bends, the shallow channel means the current is slow.
- Slip-off slopes form here because sediment is deposited by the low-velocity water.
- Meanders are usually found in the middle course of a river.
![Illustrative background for Ox-bow lakes](https://image-v2.cdn.app.senecalearning.com/2018-03/98b6f2be-622e-4469-9737-3a4b9c1ec08e/shutterstock_417843538,h_400,q_80,w_640.jpg)
![Illustrative background for Ox-bow lakes ?? "content](https://image-v2.cdn.app.senecalearning.com/2018-03/98b6f2be-622e-4469-9737-3a4b9c1ec08e/shutterstock_417843538,h_400,q_80,w_640.jpg)
Ox-bow lakes
Ox-bow lakes
- Over time, meanders become larger, until eventually an ox-bow lake forms.
- Erosion causes the bends to move closer together to create a swan’s neck meander.
- During a flood, high energy water will breach the meander neck.
- This makes the river flow in a straighter and faster course.
- Over time, deposits will fill in the meander bends.
- The meander becomes cut off from the river, forming an ox-bow lake.
1Geography Skills
1.1Mapping
2Geology of the UK
2.1The UK's Rocks
2.2Case Study: The Peak District
3Geography of the World
4Development
4.1Development
4.2Uneven Development
4.3Case Study: Democratic Republic of Congo
5Weather & Climate
5.1Weather
5.1.1Weather & Climate
5.1.2Components of Weather
5.1.3Temperature
5.1.4Sunshine, Humidity & Air Pressure
5.1.5Cloud Cover
5.1.6Precipitation
5.1.7Convectional Precipitation
5.1.8Frontal Precipitation
5.1.9Relief or Orographic Precipitation
5.1.10Wind
5.1.11Extreme Wind
5.1.12Recording the Weather
5.1.13Extreme Weather
5.2Climate
6The World of Work
7Natural Resources
7.1Rocks
8Rivers
8.1River Processes & Landforms
8.2Rivers & Flooding
8.2.1Flood Risk Factors
8.2.2Flood Management: Hard Engineering
8.2.3Flood Management: Soft Engineering
8.2.4Flooding Case Study: Boscastle
8.2.5Flooding Case Study: Consequences of Boscastle
8.2.6Flooding Case Study: Responses to Boscastle
8.2.7Flooding Case Study: Bangladesh
8.2.8End of Topic Test - Rivers
8.2.9Rivers Case Study: The Nile
8.2.10Rivers Case Study: The Mississippi
9Coasts
9.1Formation of Coastal Landforms
10Glaciers
10.1Overview of Glaciers & How They Work
10.1.1Distribution of Glaciers
10.1.2Types of Glaciers
10.1.3The Last Ice Age
10.1.4Formation & Movement of Glaciers
10.1.5Shaping of Landscapes by Glaciers
10.1.6Glacial Landforms Created by Erosion
10.1.7Glacial Till & Outwash Plain
10.1.8Moraines
10.1.9Drumlins & Erratics
10.1.10End of Topic Tests - Glaciers
10.1.11Tourism in Glacial Landscapes
10.1.12Strategies for Coping with Tourists
10.1.13Case Study - Lake District: Tourism
10.1.14Case Study - Lake District: Management
11Tectonics
11.1Continental Drift & Plate Tectonics
11.2Volcanoes
11.3Earthquakes
11.5Managing the Risk of Volcanoes & Earthquakes
12Climate Change
12.1The Causes & Consequences of Climate Change
12.1.1Evidence for Climate Change
12.1.2Natural Causes of Climate Change
12.1.3Human Causes of Climate Change
12.1.4The Greenhouse Effect
12.1.5Effects of Climate Change on the Environment
12.1.6Effects of Climate Change on People
12.1.7Climate Change Predictions
12.1.8Uncertainty About Future Climate Change
12.1.9Mitigating Against Climate Change
12.1.10Adapting to Climate Change
12.1.11Case Study: Bangladesh
13Global Population & Inequality
14Urbanisation
14.1Urbanisation
14.1.1Rural Characterisitcs
14.1.2Urban Characteristics
14.1.3Urbanisation Growth
14.1.4The Land Use Model
14.1.5Rural-Urban Pull Factors
14.1.6Rural-Urban Push Factors
14.1.7The Impacts of Migration
14.1.8Challenges of Urban Areas in Developed Countries
14.1.9Challenges of Urban Areas in Developing Countries
14.1.10Urban Sustainability
14.1.11Case Study: China's Urbanisation
14.1.12Major UK Cities
14.1.13Urbanisation in the UK
14.1.14End of Topic Test- Urbanisation
14.1.15End of Topic Test - Urban Issues
15Ecosystems
15.1The Major Biomes
15.2Case Study: The Amazon Rainforest
16Life in an Emerging Country
16.1Case Studies
17Analysis of Africa
17.1Africa
17.1.1Desert Biomes in Africa
17.1.2The Semi-Desert Biome
17.1.3The Savanna Biome
17.1.4Overview of Tropical Rainforests
17.1.5Colonisation History
17.1.6Population Distribution in Africa
17.1.7Economic Resources in Africa
17.1.8Urbanisation in Africa
17.1.9Africa's Location
17.1.10Physical Geography of Africa
17.1.11Desertification in Africa
17.1.12Reducing the Risk of Desertification
17.1.13Case Study: The Sahara Desert - Opportunities
17.1.14Case Study: The Sahara Desert - Development
18Analysis of India
18.1India - Physical Geography
19Analysis of the Middle East
19.1The Middle East
19.1.1Physical Geography of the Middle East
19.1.2Human Geography of the Middle East
19.1.3Climate Zones in the Middle East
19.1.4Climate Comparison with the UK
19.1.5Oil & Natural Gas in the Middle East
19.1.6Water in the Middle East
19.1.7Population of the Middle East
19.1.8Development Case Studies: The UAE
19.1.9Development Case Studies: Yemen
19.1.10Supporting Development in Yemen
19.1.11Connection to the UK
19.1.12Importance of Oil
19.1.13Oil & Tourism in the UAE
20Analysis of Bangladesh
20.1Bangladesh Physical Geography
21Analysis of Russia
21.1Russia's Physical Geography
21.2Russia's Human Geography
Jump to other topics
1Geography Skills
1.1Mapping
2Geology of the UK
2.1The UK's Rocks
2.2Case Study: The Peak District
3Geography of the World
4Development
4.1Development
4.2Uneven Development
4.3Case Study: Democratic Republic of Congo
5Weather & Climate
5.1Weather
5.1.1Weather & Climate
5.1.2Components of Weather
5.1.3Temperature
5.1.4Sunshine, Humidity & Air Pressure
5.1.5Cloud Cover
5.1.6Precipitation
5.1.7Convectional Precipitation
5.1.8Frontal Precipitation
5.1.9Relief or Orographic Precipitation
5.1.10Wind
5.1.11Extreme Wind
5.1.12Recording the Weather
5.1.13Extreme Weather
5.2Climate
6The World of Work
7Natural Resources
7.1Rocks
8Rivers
8.1River Processes & Landforms
8.2Rivers & Flooding
8.2.1Flood Risk Factors
8.2.2Flood Management: Hard Engineering
8.2.3Flood Management: Soft Engineering
8.2.4Flooding Case Study: Boscastle
8.2.5Flooding Case Study: Consequences of Boscastle
8.2.6Flooding Case Study: Responses to Boscastle
8.2.7Flooding Case Study: Bangladesh
8.2.8End of Topic Test - Rivers
8.2.9Rivers Case Study: The Nile
8.2.10Rivers Case Study: The Mississippi
9Coasts
9.1Formation of Coastal Landforms
10Glaciers
10.1Overview of Glaciers & How They Work
10.1.1Distribution of Glaciers
10.1.2Types of Glaciers
10.1.3The Last Ice Age
10.1.4Formation & Movement of Glaciers
10.1.5Shaping of Landscapes by Glaciers
10.1.6Glacial Landforms Created by Erosion
10.1.7Glacial Till & Outwash Plain
10.1.8Moraines
10.1.9Drumlins & Erratics
10.1.10End of Topic Tests - Glaciers
10.1.11Tourism in Glacial Landscapes
10.1.12Strategies for Coping with Tourists
10.1.13Case Study - Lake District: Tourism
10.1.14Case Study - Lake District: Management
11Tectonics
11.1Continental Drift & Plate Tectonics
11.2Volcanoes
11.3Earthquakes
11.5Managing the Risk of Volcanoes & Earthquakes
12Climate Change
12.1The Causes & Consequences of Climate Change
12.1.1Evidence for Climate Change
12.1.2Natural Causes of Climate Change
12.1.3Human Causes of Climate Change
12.1.4The Greenhouse Effect
12.1.5Effects of Climate Change on the Environment
12.1.6Effects of Climate Change on People
12.1.7Climate Change Predictions
12.1.8Uncertainty About Future Climate Change
12.1.9Mitigating Against Climate Change
12.1.10Adapting to Climate Change
12.1.11Case Study: Bangladesh
13Global Population & Inequality
14Urbanisation
14.1Urbanisation
14.1.1Rural Characterisitcs
14.1.2Urban Characteristics
14.1.3Urbanisation Growth
14.1.4The Land Use Model
14.1.5Rural-Urban Pull Factors
14.1.6Rural-Urban Push Factors
14.1.7The Impacts of Migration
14.1.8Challenges of Urban Areas in Developed Countries
14.1.9Challenges of Urban Areas in Developing Countries
14.1.10Urban Sustainability
14.1.11Case Study: China's Urbanisation
14.1.12Major UK Cities
14.1.13Urbanisation in the UK
14.1.14End of Topic Test- Urbanisation
14.1.15End of Topic Test - Urban Issues
15Ecosystems
15.1The Major Biomes
15.2Case Study: The Amazon Rainforest
16Life in an Emerging Country
16.1Case Studies
17Analysis of Africa
17.1Africa
17.1.1Desert Biomes in Africa
17.1.2The Semi-Desert Biome
17.1.3The Savanna Biome
17.1.4Overview of Tropical Rainforests
17.1.5Colonisation History
17.1.6Population Distribution in Africa
17.1.7Economic Resources in Africa
17.1.8Urbanisation in Africa
17.1.9Africa's Location
17.1.10Physical Geography of Africa
17.1.11Desertification in Africa
17.1.12Reducing the Risk of Desertification
17.1.13Case Study: The Sahara Desert - Opportunities
17.1.14Case Study: The Sahara Desert - Development
18Analysis of India
18.1India - Physical Geography
19Analysis of the Middle East
19.1The Middle East
19.1.1Physical Geography of the Middle East
19.1.2Human Geography of the Middle East
19.1.3Climate Zones in the Middle East
19.1.4Climate Comparison with the UK
19.1.5Oil & Natural Gas in the Middle East
19.1.6Water in the Middle East
19.1.7Population of the Middle East
19.1.8Development Case Studies: The UAE
19.1.9Development Case Studies: Yemen
19.1.10Supporting Development in Yemen
19.1.11Connection to the UK
19.1.12Importance of Oil
19.1.13Oil & Tourism in the UAE
20Analysis of Bangladesh
20.1Bangladesh Physical Geography
21Analysis of Russia
21.1Russia's Physical Geography
21.2Russia's Human Geography
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