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GCSE Geography 01 — River Environments

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Topics include Hydrological cycle: stores, flows, and the global system, Drainage basins: inputs, outputs, and basin characteristics, River discharge and hydrographs (storm hydrographs), Weathering and mass movement in river valleys, Fluvial processes: erosion, transport, and deposition, Upper-course river landforms (erosional), Meanders, floodplains, and lower-course landforms, and Downstream changes: the Bradshaw model and river profiles.

Geography EN
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Hydrological cycle: stores, flows, and the global system

The global hydrological cycle describes how water moves between the atmosphere, land and oceans. It is a closed system at the global scale, but water is constantly transferred between stores by flows.

Key points

  • At the global scale the hydrological cycle is a closed system: water is recycled, not created or lost.
  • Stores (e.g., oceans, ice, soil moisture, groundwater, atmosphere) hold water for a time; flows/transfers move water between stores.
  • At the drainage basin scale, precipitation is the main input; outputs include evapotranspiration and river discharge.
  • Key transfers include interception, infiltration, percolation, throughflow, overland flow (runoff), and groundwater flow.
  • Vegetation and soil characteristics affect how much water becomes runoff versus stored in soils/groundwater.

Worked example

Question

Explain two reasons why a drainage basin in an urban area may produce higher peak discharge after a storm than a rural basin.

Solution

1) Urban areas have more impermeable surfaces (roads/roofs), so less water infiltrates and more becomes overland flow. This delivers water to the channel quickly, raising peak discharge.
2) Storm drains and modified channels route water rapidly to the river, shortening lag time and concentrating runoff, which also increases the peak.

Common pitfalls

  • Mixing up stores (where water is held) with flows (how it moves).
  • Assuming the cycle is closed for a single drainage basin (basins are open systems).
  • Saying 'infiltration is a store' rather than a transfer into the soil store.

Prerequisites

  • Prerequisite knowledge (auto-added).
  • Prerequisite knowledge (auto-added).
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