AQA AS Geography Rivers keywords

All the keywords for chapter 1 taken from my class notes and the AQA AS Geography text book. Hope you find this helpful :)

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  • Created on: 24-03-13 16:48
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River, floods and management Keywords Physical Geography Revision
River, floods and management
The drainage basin hydrological cycle:
Drainage Basin ­ catchment area of a river (where it obtains its water from)
Watershed ­ delimits one drainage basin from another
Inputs ­ moisture into the cycle (PPT)
Outputs ­ movement of moisture out of the hydrological cycle (evaporation, runoff and percolation)
Stores of water ­ how water is stored on surface (glaciers, rivers, lakes, puddles) and also in
vegetation (in plant roots, on plant leaves and soil)
Transfers and flows ­ move water through the system (stemflow, infiltration etc.)
Water balance/budget ­ the balance between the inputs and the outputs
River Regime ­ annual pattern of rainfall in terms of river discharge
Evaporation ­ water (l) is transformed to water vapour (g). Lots of energy required from either heat
from the sun or movement from the wind
Transpiration ­ water is lost from plant via pores in the leaves
Evapotranspiration - amount of water removed from vegetated area by transpiration and
evaporation
Groundwater flow ­ the slowest transfer. Main import of water (especially in dry seasons). Flows
through layers of rock deep under the surface in permeable rocks.

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Page 2

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River, floods and management Keywords Physical Geography Revision
Infiltration ­ Water passes through soil and happens quickly at the beginning of a storm because the
water is saturated. Water passes quicker through sand than clay
Interception ­ raindrops are intercepted by leaves and branches as well as grass. Evaporation
removes water from system so does not pass to river
Percolation - movement of water through rock under the soil surface.…read more

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River, floods and management Keywords Physical Geography Revision
Attrition ­ when the fragments of rock strike each other and the river bed making particles and the
river bed smoother
Vertical erosion ­ more dominant at upper course of river. Makes v-shape valleys by abrasion and
hydraulic action
Lateral erosion- found in the middle and lower courses of the river.…read more

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River, floods and management Keywords Physical Geography Revision
Interlocking spur ­ occurs in the upper course of the river where hills jut out to form a staggered
formation in the valley
Bluff ­ where the valley side slowly slopes and is steadily lowered into the flat flood plain
Eyot ­ islands of deposits (some can be found in the River Thames and its tributaries)
Wetted perimeter ­ total length of the river bed and the banks in the cross section that are in contact
with…read more

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River, floods and management Keywords Physical Geography Revision
Hazard ­ natural event that threatens both life and property
River management ­ strategies are put in place to prevent flooding and ensure there is enough
water…read more

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