Topic 4: 4.7 River landscapes are influenced by human activity interacting with physical processes — Edexcel GCSE Geography B
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Topic 4: 4.7 River landscapes are influenced by human activity interacting with physical processes explained
Topic 4: 4.7 River landscapes are influenced by human activity interacting with physical processes covers 2 specification points, including A.
Read the full explanation
How human activities (urbanisation,… and B. How the interaction of physical and human…. Open a point below for its explanation and revision guidance.
a. How human activities (urbanisation, land-use change, deforestation) change river landscapes which alter storm hydrographs.
Explain how urbanisation, land-use change and deforestation change river landscapes, and how those changes alter storm hydrographs. Urbanisation covers land with impermeable roofs, roads and pavements, so more rain runs off the surface and reaches the channel quickly. Drains and sewers can speed this further, shortening lag time and raising peak discharge. Land-use change, such as converting woodland to pasture or arable land, can compact soil and reduce infiltration. Deforestation removes interception and transpiration, so more water reaches the ground and overland flow increases. Channel straightening changes the river landscape and can increase sediment supplied to the river.
b. How the interaction of physical and human processes is causing river flooding on one named river , including the significance of its location.
This criterion asks how physical and human processes interact to cause flooding on one named river, including why its location matters. Name one river and its place. Explain physical processes such as intense rainfall, saturated soils and impermeable rock that produce rapid runoff. Explain human processes such as urbanisation and channel straightening, and show how each changes a physical process, for example by reducing infiltration. Explain the significance of location: a floodplain, riverside settlement or low position in the catchment each increases exposure and impact. Link the processes rather than listing them.
Your focus
- Identifies how urbanisation, land-use change and deforestation alter river landscapes.
- Explains how these human activities shorten lag time or raise peak discharge.
- Selects the human-induced change that best explains a given storm hydrograph in a multiple-choice question.
Show all 6 objectives
- Name one river and its location, and explain why that location is significant for flooding.
- Explain physical and human processes that cause flooding on the named river.
- Link physical and human processes to show how they interact to cause flooding.
Topic 4: 4.7 River landscapes are influenced by human activity interacting with physical processes exam tips
Marking Points
- Explains how impermeable urban surfaces increase surface runoff and shorten lag time.
- Links drains and sewers to faster delivery of water to the channel and a higher peak discharge.
- Describes how deforestation removes interception and transpiration, increasing overland flow.
- Explains how land-use change such as soil compaction reduces infiltration and increases runoff.
- Connects channel straightening to changes in the river landscape and a faster hydrograph response.
- Names one specific river and its location before explaining the flooding.
- Explains at least one physical process, such as intense rainfall on saturated ground, that raises river discharge.
- Explains at least one human process, such as urbanisation or channel straightening, and how it alters a physical process.
- Links physical and human processes so the answer shows interaction rather than two separate lists.
- Explains why the river's location, such as a floodplain or riverside settlement, increases exposure to flooding.
Examiner Tips
- 💡Link each human activity to a specific hydrograph change, such as shorter lag time or higher peak discharge.
- 💡Name the landscape change, such as channelisation or soil compaction, before stating its effect on the hydrograph.
- 💡In multiple-choice items, check whether an option reverses the effect of urbanisation on peak discharge.
- 💡Select one river you have studied in detail and keep to it throughout the answer.
- 💡Build a chain of cause and effect, such as urban surfaces leading to faster runoff and higher peak discharge, to show interaction.
- 💡Reserve a final sentence to explain the significance of location so that this part of the statement is not forgotten.
Common Mistakes
- Assumes urbanisation reduces flood risk; correct this by stating that impermeable surfaces increase runoff and peak discharge.
- Treats deforestation as reducing overland flow; correct this by explaining that removing trees lowers interception, so more water reaches the ground.
- Describes human changes without linking them to a hydrograph effect; correct this by stating the change to peak discharge or lag time.
- Lists physical causes and human causes separately; show how one process changes the other.
- Describes flooding without naming a river, losing the named-river requirement; name the river and its location.
- Treats location as background detail; explain how the position of people and property increases the risk and impact.