a.glaciers and icebergsglaciers and icebergs b.wetlandswetlands c.ponds and lakesponds and lakes...
TRANSCRIPT
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A. Glaciers and IcebergsB. WetlandsC. Ponds and LakesD. Streams and RIvers
3. Rivers Shape the Land
1. Runoff
5. Flood Plains and Floods
Surface WaterReview
2. River Systems
4. Profile of a River
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Water Phase Changes
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Hydrologic Cycle
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1.Glacier-huge mass of ice and snow that moves slowly over the land scraping and reshaping ita.Valley
b. b. Continental
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2. Iceberg-large floating chunk of ice. Only 7%-10% visible
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1.An area of land covered with a shallow layer of water for all or part of the year
2. Sheltered waters rich with nutrients provide great habitats
3.help control flooding4.3 main types: bogs,
marshes and swamps5.Florida Everglades largest
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1. Form when water collects in hollows and low-lying land areas
2. Ponds-shallow lake where sunlight reaches the bottom
3. Lake-large body of water; usually deep; formed in depressions like craters, glacial deposits or from dams (reservoirs)
4. Turnover-seasonal mixing of bottom and top layers that refresh nutrients
5. Eutrophication-nutrient build-up causes algae to overgrow
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1.Runoff-water that flows over the ground. Several factors affect this flow.
a.Type of surfaceb.Rate of rainfallc.Slope of the land
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A river system consists of a river and all of its
tributaries.
The drainage basin of a river system is all the land that is drained by the river and its tributaries. This is also called a watershed . There are many but we live in the largest. It is the Mississippi River Basin
2. River Systems
Tributary
River
Divide
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Important Definitions
____________ – a stream and all its tributaries
________ – a smaller stream that empties into a larger stream
_________ – the land area drained by a river system
______ – a high point that separates river systems
River System
Tributary
Watershed
Divide
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River Channels and Drainage
There are different types of river channel patterns and river drainage patterns.
1. Dendritic2. Radial3. Rectangular4. Trellis
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Dendritic -interconnecting streams resemble the pattern that branches of a tree might make
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Radial network
Radial- streams flow outward from a cone-shaped mountain, and make a pattern resembling spokes on a wheel.
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Rectangular
streams join each other at right angles because of a rectangular grid of fractures that breaks up the ground
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Trellis-A system that develops across a landscape of parallel valleys and ridges so that major tributaries flow down the valleys and join a trunk that cuts through the ridge; the resulting map pattern resembles a garden trellis.
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3. Rivers Shape the Land
a. River speed is a factor that can be determined by the:
1.Steepness of a slope2.The channel it flows
through (this creates friction)
3.Volume of water
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b. Rivers wear down Earth’s surface and erode and deposit materials like sediments. A river may carry materials in solution, in suspension, and in its bed load.
Flow
Suspension:Silt and clay
Bed load: sand, gravel,pebbles and boulders Materials carried in
solution cannot be seen.
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1.________ – wearing away of materials
2.__________ – soil and rock are left behind
3._________ – rock and soil picked up and dropped in erosion and deposition
ErosionDepositionSediments
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4. A stream can carry its load in three different ways:
________ – material is dissolved __________ – particles are held up by
stream’s moving water_________ – material pushed or rolled
along the stream’s channel
solutionsuspensi
onbed load
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How Streams Move Sediment
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c. The speed of a river determines what drops out of the water to create different landforms. These landforms can be:
1. Canyons
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2. Mudflats
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3. Sandbars
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4. Gully
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____________ – deposit formed when a stream spreads out onto a less steep area like at the base of a mountain
5. Alluvial Fan
Write the definition down!
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_____ – where a stream empties into a larger body of water
6. Delta
Write the definition down!
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4. Profile of a River
a. Headwaters-Beginning or river source; fast water and narrow canyons
b.Downriver-slope less steep; tributaries increase water volume; channel is wider and deeper because of erosion
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c. Flood Plain-broad, flat area that has other river features1. Meanders-looping
curves2. Oxbow lakes-crescents
of land cut off from the main river
d. Mouth- Point where the river flows into another body of water (deltas, alluvial fans)
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________ – the bends and curves of a stream
Meanders
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Oxbow lake
deposition
erosion
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Youthful rivers form steep-sided canyons and V-shaped valleys. The lowest level to which a river can erode its bed is called its base level.
River Valleys
Surface Water
Rapids can form as a river runs down a deep slope, while a river that plunges over a cliff forms a waterfall.
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Stream Stages
________:
RapidsWaterfallsFast-moving
waterSteep slope
_______:
Broad floodplain
MeandersOxbow lakesMeander Scars
Youthful Old
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River Systems
Youthful
Mature
Old
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Stream Processes and Floodplain Development
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Oxbow Lakes
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Oxbow Lakes
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____________ – when an old age stream downcuts to “make it new again”
Rejuvenation
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Forming Stream Terraces
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floodplain
A river that has cut down close to its base level tends to erode the sides of its valley, forming a meandering river in a wide flood plain.
5. Floodplains and Floods
Back swampValley wall
Oxbow lake
Meander
Natural levees
Yazoo tributary
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River floods are natural events that can have constructive as well as destructive effects. They destroy habitats and homes but they leave behind land rich in nutrients.
People have developed different methods to control and prevent river flooding. One is a man-made dam called a levee
Floods occur when the volume of water in a river increases and overflows its channels.
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Floodplain and Natural Levee Development
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Mississippi River Flood
1993 Before and After
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Tigris – Euphrates River
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The Nile River
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Yangtze River
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Ganges River
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Amazon River
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The Mississippi River
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Vocabulary Review
Flood: The phenomenon whereby a river overflows its banks.
Flood plain: A wide, level area that borders a river and is covered by its water during a flood.
Meander: Broad: looping bends in a river.Oxbow lake: A crescent-shaped body of water
formed when sediments deposited by a river cut off a meander from the river.
Natural levees: Elevated ridges along a river’s bank that are formed by the deposition of the river’s sediment load.
Flash flood: A sudden flood, usually caused by intense, heavy rainfall.