Pages in this set

Page 1

Preview of page 1
The Drainage Basin Hydrological Cycle


The drainage basin is an area of land drained by a river and its tributaries. The hydrological cycle is
the process by which water is moved within the drainage basin. The drainage basin hydrological cycle
is an open system as water is gained and lost.…

Page 2

Preview of page 2
Vocab Definition
Precipitation Any form of moisture that falls to the Earth's surface (rain, sleet,
snow, hail). Acts as the major input into the system.
Evaporation The physical process by which water is changed into water vapour and
moisture is lost from the system.
Interception Where vegetation catches the precipitation…

Page 3

Preview of page 3
Lag Time The period of time between the peak rainfall and peak precipitation in
the drainage basin. This varies according to conditions within the
basin.




Using a systems approach, explain how different components of the drainage basin hydrological
cycle are linked
(15 marks)

There are four main components of the…

Page 4

Preview of page 4
in the autumn/winter months, most trees will shed their leaves; massively lowering the chance of
water being intercepted.

If the soil is not saturated, then water will infiltrate (move vertically down through the soil). From
here it can be stored as soil moisture storage and if the underlying rock is…

Page 5

Preview of page 5
greater than evapotranspiration for 7 months of the year.

2. E > P from April to August (5 months). Evapotranspiration is highest in June/July.

3. Soil moisture recharge occurs as evapotranspiration decreases from October due to reduced
temperatures and less output when trees lose their leaves. P > E here…

Page 6

Preview of page 6
6

Page 7

Preview of page 7
Hydrographs

A graph showing the variations in a river's discharge (in cumecs) over a period of time. There are two
types: flashy and steady. They show how a river responds to a rainfall event.

Factor Affecting Flashy Hydrograph Steady Hydrograph
Hydrograph




Precipitation - Prolonged rainfall ­ soil becomes - If…

Page 8

Preview of page 8
- Thin soils are easily saturated, - A loam soil is best for storing water as
reducing soil moisture storage and it is a mix of sand and clay that
increasing surface run-off. promotes infiltration and storage.
Geology - Impermeable rock such as - Permeable or porous rock which
granite/slate…

Page 9

Preview of page 9
River processes

Erosion

Erosion is the breakup of rocks by the action of rock particles being moved over the earth's surface by
water, wind and ice.

Rivers erode because they possess energy. Their total energy depends on:

The weight of the water (the greater the mass the more energy due…

Page 10

Preview of page 10
There are four main processes of river erosion:

Abrasion is the scraping and scouring of the load. It is most effective in short turbulent
periods such as when the river is in flood or at bankfull.
Hydraulic action is the force of the moving water. It is effective at dislodging…

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »