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Unformatted text preview: ands and associated wildlife.
Periodic floods also deposit fresh
alluvium replenishing soil nutrients
and organic matter.
Thus flooding, agriculture, and
agricultural practices are closely
Present-day negative effects of
deforestation swamp the normally
positive effects of natural flooding.
9 3 The Hydrologic Cycle
Transpiration 10 Where does most of the precipitation fall?
11 12 4 Channel
Basins A B Stream
13 - volume of water going past certain point over
Longitudinal river profile time Head Waters:
• high velocity
• erosion Head Waters Plains - speed plus dimensions of channel Coastal Plains:
• low velocity
• _________ deposition Distance River Discharge : Q = W x D x V
14 - Tems River; central channel (meandering) Features of a Lowland River - ﬂood plane = space that water will occupy
High f low
Deltas in case of ﬂood, ﬂattness records back and
forth of channel, carve plato like feature - sendiment come out of water, decreses in speed
no longer transport sediment
15 natural levees: high areas when water escapes banks
ﬂows out and forms these, helps prevent small ﬂood 5 - places that are eroded, and deposition is the River Features - ﬂood concentrated to outer bank, piles up - high pressure area on outer bank, wants to go Erosion &
Deposition from high to low pressure, ﬂows down to other side
- now have area on inner bank where deposition occurs cause ﬂow is slowest Deposition:
16 - coarsest sediment, natural levees/guard against minor
floods = breakwaters -ﬂow fastest = erosion, slow is slowly =deposition
-longitudial flow, vortical flow, add 2 together, flow is like
a corkscrew, goes other way around other bank - oxbow lake when meander is working harder then
needed, and it gets cut off River Features
Oxbow Lake - deltas - lot of mud, not a lot of wave action
- 17 - stream system curves down, terraces
- point bar deposit, meander scar, backswamp, yazoo
tributary, meandering, graded stream, oxbow lake
Stream Processes and Floodplain Development 18 6 The worst flood of the centur...
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This document was uploaded on 02/25/2014.
- Fall '14