Lesson 3 River velocity and profilePresentation Transcript
Access GeographyWeek 17 Riddle of the day!! What can run but never walks has a mouth but never speaks and has a bed but never Sleeps? Fluvial processes and land from development
Learning objectives Have a basic understanding of the factors that influence river velocity Understand the processes of erosion, transportation and deposition that are present in a river To improve teamwork skills to produce an effective teaching resource
So what do you know already?? Blutac the river features and processes along your river profile For any you are not sure about stick at the bottom Upper Course Middle Course Lower Course Not sure At the end of Thursday’s lesson we will come back to this sheet and you should be able to correct any mistakes and slot in the ones you are not sure about
What do rivers want? Rivers strive to have the most efficient channel they can have…… But what do they transport??
Rivers seek the path of least resistanceIdeally for them, which direction would they go in? There are two patterns of flow:
Laminar Flow: sometimes known as streamline flow, occurs when a fluid flows in parallel layers, with no disruption between the layers
Turbulent Flow: is a fluid regime characterized by chaotic property changes. This includes rapid variation of pressure and velocity in space and time
So how does velocity link to turbulence? Watch these two videos in each one note down The velocity (fast /slow) The turbulence (very turbulent/not turbulent) The energy (High energy/ low energy) The erosive ability River 1 River 2
The velocity of the river is influenced by what? Channel shape Channel roughness Channel slope
Ten word posters!! The velocity of the river is influenced by what? ARRGGHH!!! Channel shape Channel roughness Channel slope In three groups you have only 15 minutes to produce a quick presentation conveying the information you have been given. Remember you only have 10 words and 15 minutes In your presentation everyone needs to say something!
So how are rivers like a shopping trip?
Erosion: Rivers pick up material or erode material from one place…
Transportation: Then the river carries, or transports it to another place…
Deposition: Then, when the river slows down and loses energy it drops or deposits its load.