chapter 14 river systems and landforms geosystems 6e an introduction to physical geography robert w....
TRANSCRIPT
Chapter 14River Systems and
Landforms
Geosystems 6eAn Introduction to Physical Geography
Robert W. ChristophersonCharles E. Thomsen
River Systems and LandformsHydrology – the science of water, its global circulation, distribution, and propertiesFluvial Processes and Landscapes
Fluvial - river
Streamflow Characteristics Floods and River Management
Urban environments increase flood potential
Fluvial Processes and Landscapes Fluvial erosion – weathered sediments are transported to new locations by water
Deposition – the process through which materials are laid down by waterAlluvium – unconsolidated rock material deposited by running water
Base Level of Streams - level below which a stream cannot erode its valley
Base Levels
Figure 14.3
Drainage basin – the catchment area of a watershed
Open system
Continental divide – extensive mountain or highland regions that separate drainage basins
Fluvial Processes and Landscapes
A Drainage Basin
Figure 14.4
Drainage Basins
Figure 14.5
Streamflow Characteristics Exotic Streams – A river that originates in a humid region and then flows through an arid region, so discharge decreases with distance
Nile RiverColorado River
Stream ErosionAbrasion – rock particles suspended in moving water carve the streambed
Stream Transport Dissolved load – minerals that form a chemical solution in waterSuspended load – pieces of rock suspended in water
Stream Transport Bed load – coarser materials dragged or pulled along the streambed by moving water
Aggradation – deposition of materials suspended in water
Streamflow Characteristics
Fluvial Transport
Figure 14.13
Braided Stream
Figure 14.14
Meandering Stream Profile
Figure 14.15
Meandering Stream Development
Figure 14.15
Itkillik River, Alaska
Figure 14.15
Stream Longitudinal Profile
Figure 14.18
Nickpoint
Figure 14.20
Floodplain Features
Figure 14.23
Alluvial Terraces
Figure 14.25
Mississippi River Delta
Figure 14.28
Mississippi River Delta
Figure 14.28Copyright © 2006 Pearson Prentice Hall, Inc.
Floods and River Management Rating Floodplain Risk
Flood – a high water level that overflows the natural riverbank along a portion of the stream
End of Chapter 14
Geosystems 6eAn Introduction to Physical Geography
Robert W. ChristophersonCharles E. Thomsen