Presentation on theme: "Drainage Basins basins/3238.html"— Presentation transcript:
Drainage Basins http://www.bbc.co.uk/learningzone/clips/watersheds-and-drainage- basins/3238.html http://www.youtube.com/watch?v=sfEi8CoPVgc&safe=active All of you will create a 3D model of a drainage basin Most of you will know the key terms linked to drainage basins Most of you will be able to describe, using an example, the effect of adapting a drainage basin
Your book A template A stick of glue Scissors Pencil crayons- blue and brown A pen
Cut out the template. Make sure you cut up the vertical line.
Using a brown crayon, shade around the circumference of the circle.
Using a blue crayon, shade the left triangle, draw some blue lines running from the top of the triangle and branching out towards the edge of the circle.
Watershed the area of high land forming the edge of a river basin. Source where a river begins. Mouth where a river meets the sea. Confluence the point at which two rivers meet. Tributary a small river or stream that joins a larger river. Channel this is where the river flows. Drainage Basin this is the area of land drained by a river and its tributaries. 1 You will now need a pen. Number the following features on your template. 2 3 4 5 6 7
Watershed the area of high land forming the edge of a river basin. Source where a river begins. Mouth where a river meets the sea. Confluence the point at which two rivers meet. Tributary a small river or stream that joins a larger river. Channel this is where the river flows. Drainage Basin this is the area of land drained by a river and its tributaries. 1 2 3 4 5 6 7 Give your diagram the title ‘River Basin’. Write the numbers and corresponding definitions into your book.
12,935 square kilometres (4,994 square miles). 13 million people live in the basin, 7 million of which live in London. Thames River Basin http://www.bbc.co.uk/learningzone/clips/watersheds-and-drainage-basins/3238.html http://www.youtube.com/watch?v=sfEi8CoPVgc&safe=active
Drainage basin 1.What is the difference between a drainage basin and a water shed? 2.How can people change a drainage basin? (Some of these might be similar to the changes you found for the river system)
The Colorado River, South West USA LO: To describe how humans have adapted the drainage basins of one of the world’s major rivers Outcomes All will be able to locate the Colorado River and name its famous feature Most will be to describe at least two adaptations that have been made to the Colorado River’s drainage basin Some will be able to suggest problems that the management of the Colorado River has caused
The Colorado River’s Drainage Basin 2.Where is the drainage basin of the Colorado River? (which area of the USA, which states etc.) 3.Which state is the source of the Colorado River in? 4.How high (m asl) is the source of the river? 5.What happens to the height of the river as it travels to the sea? 6.Where is the mouth of the Colorado River? 7.How many people depend on the water from the Colorado?
Managing the Colorado River’s Drainage Basin Anti flooding Agriculture Population Growth Tourism http://www.youtube.com/watch?v=FIPV-H9iCPA&safe=active
How have they managed the Colorado River? 8. The Colorado River drainage basin (the area the river collects water from) has a seasonal rainfall pattern. What does seasonal rainfall mean? 9. What have the government built to store and transport water from the Colorado? Has the management of the Colorado River been a success? Why? Explain your answer giving at least 3 points.
River Processes LO: To describe the jobs that rivers do All should be able to name the processes that rivers carry out Most will be able to describe the different types of erosion and transportation Some will be able to explain why rivers carry out different jobs at different stages
Catchment The area from which water drains into a particular drainage basin. Tributary A river which joins a larger river. Confluence The point at which two rivers join. Watershed The boundary dividing one drainage basin from another- a ridge of high land. What is a drainage basin? Source The upland area where the river begins. Mouth Where the river flows into the sea, or sometimes a lake.
Processes = things that happen There are 4 processes that take place in and around rivers 1.Weathering 2.Erosion 3.Transportation 4.Deposition
Weathering Biological – rocks are broken up by expanding plant roots Chemical – acid rain damage Physical – freeze thaw. This takes place in areas where the temperature varies from above to below freezing. The stress fractures and breaks up rocks. Weathering = breaking up of rocks by weather, chemical processes, plants and animals
Erosion = The wearing away and removal of rocks by the action of water, wind or ice There are 4 types of erosion and you need to know them all 1.Abrasion (or corrasion)2. Corrosion (or solution) 3. Hydraulic Action4. Attrition http://www.youtube.com/watch?v=LplQZUzbVWI
Transportation = the movement of sediment along the river’s course There are 4 types of transportation 1.Suspension2. Solution 3. Saltation4. Traction
The River Long Profile The river profile describes how a river changes on its journey from source to mouth.