Chapter11_post

Chapter11_post - Ch 11-Stream and Flood Processes Overview...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch. 11--Stream and Flood Processes Overview of a river/stream system Stream characteristics Discharge Load Channel pattern Meandering Braided Gradient How rivers and streams work Causes of floods Ground conditions Non-ground conditions Types of floods Regional Flash Flood frequency, recurrence interval and probability
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Overview of a river system River is a complex network of interconnected channels: many small tributaries few large streams one major river Valleys are eroded over thousands to millions of years. River responds to changes in climate, discharge and sediment transport Rivers are not “fixed” features! Streams accumulate surface water from drainage basin (“watershed”)
Background image of page 2
Overview of a river system River is a complex network of interconnected channels: many small tributaries few large streams one major river
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
River/Stream Characteristics Discharge – water flow Load loose sediment being transported Channel pattern Gradient – channel steepness Streams operate in delicate state of dynamic equilibrium, that is maintained by constantly changing 1) gradient of stream bottom 2) channel pattern in response to changes in 1) discharge 2) sediment load
Background image of page 4
Stream Characteristics: Discharge Discharge : volume of water flowing per unit of time The flow velocity increases with increasing gradient (steepness) Ability to erode increases with flow velocity
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Stream Characteristics: Sediment Load Streams carry sediment downstream, eroding material in one place and depositing it in another Sediment particle size ranges from mud to giant boulders; the maximum particle size that can be transported is controlled by the water velocity There is also a limit to the volume of sediment (its load) that a stream can carry: the carrying capacity increases with discharge
Background image of page 6
Stream characteristics: Channel Pattern Meandering stream Braided stream
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Where there is: More sediment, less water Stream forms: Braided stream pattern – islands of sediment deposits
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/02/2010 for the course GEO 107 taught by Professor Stidham during the Fall '08 term at SUNY Stony Brook.

Page1 / 29

Chapter11_post - Ch 11-Stream and Flood Processes Overview...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online