Surface Water. Review. Glaciers and Icebergs Wetlands Ponds and Lakes Streams and RIvers. 1. Runoff. 2. River Systems. 3. Rivers Shape the Land. 4. Profile of a River. 5. Flood Plains and Floods. Water Phase Changes. Hydrologic Cycle. A. Glaciers and Icebergs.
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2. River Systems
3. Rivers Shape the Land
4. Profile of a River
5. Flood Plains and Floods
An area of land covered with a shallow layer of water for all or part of the year
Sheltered waters rich with nutrients provide great habitats
help control flooding
3 main types: bogs, marshes and swamps
Florida Everglades largest
Form when water collects in hollows and low-lying land areas
Ponds-shallow lake where sunlight reaches the bottom
Lake-large body of water; usually deep; formed in depressions like craters, glacial deposits or from dams (reservoirs)
Turnover-seasonal mixing of bottom and top layers that refresh nutrients
Eutrophication-nutrient build-up causes algae to overgrow
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
There are different types of river channel patterns and river drainage patterns.
Dendritic -interconnecting streams resemble the pattern that branches of a tree might make
Radial- streams flow outward from a cone-shaped mountain, and make a pattern resembling spokes on a wheel.
Rectangular streams join each other at right angles because of a rectangular grid of fractures that breaks up the ground
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.
Silt and clay
Bed load: sand, gravel,
pebbles and boulders
Materials carried in solution cannot be seen.
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.
c. The speed of a river determines what drops out of the water to create different landforms. These landforms can be:
Write the definition down!
Write the definition down!
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.
Rapids can form as a river runs down a deep slope, while a river that plunges over a cliff forms a waterfall.
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.
Floodsoccur when the volume of water in a river increases and overflows its channels.
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
1993 Before and After