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22 Cards in this Set
- Front
- Back
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Name an example of a fluvial landscape |
King range, California Taroko Gorge, Taiwan Nolchucky River, Appalachians |
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3 reasons why rivers are important |
Rivers set the relief of mountain ranges Other parts of landscape respond to base-level which is set by rivers Rivers can erode rapidly Rivers transport almost all sediment |
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Maximum rates of river erosion... |
>10mm/yr |
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Erosional landforms of rivers |
Boulder cascade Step and pool Bedrock channel |
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River depositional landforms |
Braided rivers Meandering rivers Alluvial fans |
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Different types of terrace formations |
Fill/alluvial terraces= Incised into pre-existing fill/alluvium Strath terrace= Incised into bedrock |
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Watershed definition |
Comprises of all points from which falling rain contributes to the outlet |
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Stahler stream ordering |
Measuring of the degree of branching |
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A 1st order stream is a... |
Unbranched stream |
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A 2nd order stream is formed from... |
2 or more 1st order streams |
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A 3rd order stream forms from... |
A 3rd order stream is formed from 2 or more 2nd order streams |
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Most river networks are... |
Dendritic |
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River networks are self similar or ... |
Scale invariant |
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Since river networks are scale invariant the drainage network of a major continental river will look similar to that of... |
A mountain range |
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River longitudinal profiles are generally... |
Concave up |
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River longitudinal profile best descirbed by the power law relationship between.... |
Channel slope and drainage area |
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Erosional processes of rivers... |
Abrasion Quarrying/plucking Cavitation Physical/chemical weathering |
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What is cavitation? |
Catastrophic explosion of air bubble in areas of flow at high pressure |
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Details of fluvial quarrying |
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Details of abrasion |
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Fluvial basal shear stress |
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Weakness in parametising fluvial processes... |
Neglects sediment flux and its protecting of bed and erosion of it Doesnt consider stochasity Emperically derived Neglects threshold shear stress |
