Ch.9

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# Ch.9 - PowerPoint PPT Presentation

Ch.9. Erosion and Deposition. Section 3: The Force of Moving Water. Work and Energy Energy is the ability to do work or cause change Two kinds of energy: potential energy (is energy that is stored and waiting to be used later; Kinetic energy (is the energy an object has due to its motion

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Presentation Transcript

### Ch.9

Erosion and Deposition

Section 3: The Force of Moving Water
• Work and Energy
• Energy is the ability to do work or cause change
• Two kinds of energy: potential energy (is energy that is stored and waiting to be used later; Kinetic energy (is the energy an object has due to its motion
• As gravity pulls water down a slope, the water’s potential energy changes to kinetic energy that can do work
• When energy does work, the energy is transferred from one object to another
Section 3: The Force of Moving Water
• How Water Erodes
• Most sediment washes or falls into a fiver as a result of mass movement and runoff. Other sediment erodes from the bottom or sides of the river
• Abrasion is another process by which a river obtains sediment
• Abrasion is the wearing away of rock by a grinding action
• Abrasion occurs when particles of sediment in flowing water bump into the streambed again and again; abrasion grinds down sediment particles
• The amount of sediment that a river carries is its load
• Gravity and the force of the moving water cause the sediment load to move downstream
• Most large sediment falls to the bottom and moves by rolling and sliding
• Fast—moving water actually lifts sand and other, smaller sediment and carries it downstream dissolving some sediments completely
• The river carries these dissolved sediments in solution
Section 3: The Force of Moving Water
• A river’s slope, volume of flow, and the shape of its streamed all affect how fast the river flows and how much sediment it can erode
• Slope
• A river’s slope is the amount the river drops toward sea level over a given distance
• If a river’s speed increases, its sediment load and power to erode may increase
Section 3: The Force of Moving Water
• Volume of Flow
• A river’s flow is the volume of water that moves past a point on the river in a given time
• During a flood, the increased volume of water helps the river to cut more deeply into its banks and bed
• A flooding river can carry huge amounts of sand, soil, and other sediments
Section 3: The Force of Moving Water