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GG282 (10)
Lecture

Lab 4.pdf

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Department
Geography
Course
GG282
Professor
James Hamilton
Semester
Winter

Description
Part 1 April 12, 2014 12:20 PM Introduction • Natural stream channels adopt a varietyof forms including: ○ Meandering ○ Straight ○ Braided • Meandering ○ Sediment loads are moderate ○ Valley gradients gentle ○ In a natural meandering stream, glow velocitiesin the channel are not uniform ○ Variations in flow velocity influence  Entrainment  Transport  Depositionof bed and bank materials ○ Gradually shift their position laterally as they migrate across the floodplain and produces a varietyof floodplain landforms ○ In a natural state, a meandering channel is relatively stable and provides a variety of habitats for organisms and may have a high resource value Discharge and Flooding • Discharge (flow volume)will vary over time • In general there is an inverse relation between flow volumeand frequency of occurrence • High discharge events occur relatively infrequently • When discharge exceeds the bankfull capacity of a stream channel, overbank flow occurs (a flood) • Erosion, sediment transport and deposition may accompanyhigh discharge events • The morphologyof a natural river channel and the channel pattern are strongly influenced by rela
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