rivers trabajo de sergio gutierrez fernandez
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RIVERS
By: Sergio Gutiérrez
Fernández
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River Basin -It is an area of land drained by a river and its
tributaries
Watershed
It is the higher land
which forms the
boundary of the river
basin, and which
separates two river
basins
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Source-The point at
which
a river begins
Tributaries
They are small stream or river flowing into the
main river
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Confluence The place
where a tributary joins the main river
MouthThe end of
a river
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Processes of Erosion:-Attrition: material is moved along the bed of a river
-Corrasion: Fine material rubs against the river bank-Corrosion: Some rocks forming the banks and bed of a river are dissolved by acids-Hydraulic action: The sheer force of water hitting the banks of the river
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Processes of
Transportation:-Traction: Large rocks and boulders are rolled along the bed (of the river)-Saltation: Smaller stones bounced along the bed-Suspension: Fine material, light enough in weight to be carried by the river
-Solution: Dissolved material is transported by the river
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Results of the rivers shaping the land:
-The rivers can
erode the land
.
-The rivers can transport material.
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Oxbow Lake:
Flood Plain: The flat area of land over which
a river meanders.
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Levees Delta
-An embankment
raised to prevent
a river from
overflowing.
-The deposited material will slowly build upwards and outwards
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Hydorlogical Cycle: -It is the natural recycling of
water between the oceans, atmosphere and land.
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Distributaries:
-Deposition blocks the main channel
of the river.
Hydrology-It is the study
of water.
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Flooding
Drought
-An extreme surplus of
water on the land
-An extreme shortage of water
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How does the river basin system work
Precipitation
-Is the amount of rainwater which will
become the run-off of a river
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Discharge:
-It is the amount of
water in a river
channel at a given
time, measured in
cumecs.
The flood hydrograph
-It is the relationship between precipitation and the level of
a river
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River Flooding
Causes:
Results:
-Type and amount of precipitation, type of soil and underlying rock, land use of the river basin and the human activity.
-Can put lives in danger, damage
property and disrupt people’s
normal way of life.
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How might the flood risk be reduced?
-It often needs
considerable amounts of
money and high levels of
technology.Results of a river flooding in developing countries
-Is a combination of natural factors and human mismanagement. Although flooding normally brings benefits, extreme floods, especially in developing countries, can be disastrous.
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TheEnd