Surface Water BIG Idea Surface water moves materials

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Surface Water

Surface Water

BIG Idea: • Surface water moves materials produced by weathering and shapes the surface

BIG Idea: • Surface water moves materials produced by weathering and shapes the surface of Earth.

 • What types of bodies of water constitute surface water?

• What types of bodies of water constitute surface water?

 • rivers • lakes • streams • ponds • seas

• rivers • lakes • streams • ponds • seas

 • From where does surface water come?

• From where does surface water come?

 • rain • ice • snow • under the ground

• rain • ice • snow • under the ground

 • Where does surface water go?

• Where does surface water go?

 • under the ground • into the ocean • evaporates into the sky

• under the ground • into the ocean • evaporates into the sky

I. THE WATER CYCLE (Hydrologic Cycle) • EVAPORATION: liquid water changes to water vapor

I. THE WATER CYCLE (Hydrologic Cycle) • EVAPORATION: liquid water changes to water vapor (gas)

 • TRANSPIRATION: plants give off water vapor into the air

• TRANSPIRATION: plants give off water vapor into the air

 • EVAPOTRANSPIRATION: combined processes of evaporation and transpiration

• EVAPOTRANSPIRATION: combined processes of evaporation and transpiration

 • CONDENSATION: change from water vapor to liquid water

• CONDENSATION: change from water vapor to liquid water

 • SUBLIMATION: ice slowly changes to gas without first entering a liquid state

• SUBLIMATION: ice slowly changes to gas without first entering a liquid state

 • PRECIPITATION: water falls from clouds to Earth’s surface (in the form of

• PRECIPITATION: water falls from clouds to Earth’s surface (in the form of rain, snow, sleet, hail)

 • RUNOFF: water that flows over the land into streams and rivers

• RUNOFF: water that flows over the land into streams and rivers

FACTORS THAT AFFECT RUNOFF: • soil composition • rate of precipitation • vegetation •

FACTORS THAT AFFECT RUNOFF: • soil composition • rate of precipitation • vegetation • slope

A. Water Budget • The water budget is like a financial budget… • You

A. Water Budget • The water budget is like a financial budget… • You want both to be balanced.

 • precipitation is the income • evapotranspiration and runoff are the expenses

• precipitation is the income • evapotranspiration and runoff are the expenses

II. RIVER SYSTEMS • Made up of a main stream and all the feeder

II. RIVER SYSTEMS • Made up of a main stream and all the feeder streams that flow into it • Tributaries: feeder streams for rivers

 • Watershed: area of land that drains into a lake, river or stream

• Watershed: area of land that drains into a lake, river or stream • Also known as the Drainage Basin

Chesapeake Watershed • 1 of the 3 major regional watersheds of VA • 15

Chesapeake Watershed • 1 of the 3 major regional watersheds of VA • 15 million people live within the area • covers over 64, 000 square miles

Where do the 3 major regional watershed systems in VA lead? ØChesapeake Bay ØNorth

Where do the 3 major regional watershed systems in VA lead? ØChesapeake Bay ØNorth Carolina Sounds ØGulf of Mexico

A. STREAM EROSION • CHANNEL: The path that a stream follows

A. STREAM EROSION • CHANNEL: The path that a stream follows

STREAM LOAD: materials carried by a stream Fine sand silt; speed keeps particles suspended

STREAM LOAD: materials carried by a stream Fine sand silt; speed keeps particles suspended (not sinking to river bottom) Larger materials scrape along river sides and bottom along river bottom Short jumps made by bed load if the river is moving fast enough

Ways that sediments are carried in a stream: • Bed Load • Solution •

Ways that sediments are carried in a stream: • Bed Load • Solution • Suspension

Bed Load • Large, heavy sediments are pushed or rolled along the bottom of

Bed Load • Large, heavy sediments are pushed or rolled along the bottom of a stream’s bed.

Saltation: Saltation Short jumps made by bed load if the river is moving fast

Saltation: Saltation Short jumps made by bed load if the river is moving fast enough.

Solution • Materials dissolved in a stream’s water.

Solution • Materials dissolved in a stream’s water.

Suspension • Particles small enough to be held up by the stream’s moving water.

Suspension • Particles small enough to be held up by the stream’s moving water.

 • DISCHARGE: volume of moved water by a stream at a given time

• DISCHARGE: volume of moved water by a stream at a given time

 • The faster the stream flows… • The higher its discharge… • The

• The faster the stream flows… • The higher its discharge… • The greater the load it can carry

 • Gradient: steepness of the slope the stream is flowing down • The

• Gradient: steepness of the slope the stream is flowing down • The gradient is steepest near the headwaters (beginning of the stream)

B. STAGES OF A RIVER SYSTEM Youthful Mature and Old Rejuvenated

B. STAGES OF A RIVER SYSTEM Youthful Mature and Old Rejuvenated

1. YOUTHFUL RIVERS • “V” shaped valley with steep sides • waterfalls and rapids

1. YOUTHFUL RIVERS • “V” shaped valley with steep sides • waterfalls and rapids • few tributaries • small volume of water

2. MATURE RIVERS • many tributaries • high volume of water • erosion occurs

2. MATURE RIVERS • many tributaries • high volume of water • erosion occurs along widening valley walls and during floods

a. MEANDERS: series of wide curves

a. MEANDERS: series of wide curves

b. OXBOW LAKES: closed off meander isolated away from the main part of the

b. OXBOW LAKES: closed off meander isolated away from the main part of the river

3. OLD RIVER • low gradient with slow flow • no longer erodes land

3. OLD RIVER • low gradient with slow flow • no longer erodes land • starts to fill itself in with sediment

4. REJUVENATED RIVER • gradient of a river becomes steeper due to tectonic activity

4. REJUVENATED RIVER • gradient of a river becomes steeper due to tectonic activity

Is this river young, old, or middle aged?

Is this river young, old, or middle aged?

III. STREAM DEPOSITION • Deposition: the process by which Earth materials carried by wind,

III. STREAM DEPOSITION • Deposition: the process by which Earth materials carried by wind, water, or ice settle out and are deposited (like money in the bank)

 • How sediments are deposited

• How sediments are deposited

A. Delta: fan shaped deposit at the mouth of a stream

A. Delta: fan shaped deposit at the mouth of a stream

B. Alluvial Fan: delta on land due to the rapid reduction of a stream.

B. Alluvial Fan: delta on land due to the rapid reduction of a stream.

C. Flood Deposits 1. Flood Plain: part of the valley that may be covered

C. Flood Deposits 1. Flood Plain: part of the valley that may be covered with water during a flood.

2. Natural Levees: raised riverbank that results when a river floods.

2. Natural Levees: raised riverbank that results when a river floods.

IV. Glaciers Ølarge, moving masses ice Øform: of – near Earth’s poles and –

IV. Glaciers Ølarge, moving masses ice Øform: of – near Earth’s poles and – in mountainous areas at high elevations Øcover about 10% Earth’s surface of

Two Types: 1. Valley Glacier: Øformed in mountainous areas Ølong narrow wedge of moving

Two Types: 1. Valley Glacier: Øformed in mountainous areas Ølong narrow wedge of moving ice

Erode a U-shaped valley

Erode a U-shaped valley

2. Continental Glacier: cover millions of square miles (only found on Greenland Antarctica)

2. Continental Glacier: cover millions of square miles (only found on Greenland Antarctica)

Glacial Till: unsorted rock, gravel, sand, and clay that glaciers carry and deposit •

Glacial Till: unsorted rock, gravel, sand, and clay that glaciers carry and deposit • Moraine: unsorted ridges of till left behind when the glacier melts

Glacial Striations in Central Park, NY

Glacial Striations in Central Park, NY

Glacial Erratic in Central Park, NY (Pegmatite)

Glacial Erratic in Central Park, NY (Pegmatite)