Deposition Hydrology NOTES page 11 ©Mark Place,

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Presentation transcript:

Deposition Hydrology NOTES page 11 ©Mark Place, 2007-2008 www.LearnEarthScience.com

big objects settle fastest

Rate vs. Time Time in seconds Rate is “speed” : miles/hr cm/sec

denser particles settle first

Rate of Settling Particle Shape Round - because of shape Which object will settle fastest? Round - because of shape Rate of Settling round flat Particle Shape

Rate of Deposition Slope

Rate of Deposition Stream Velocity

Rate of Deposition Stream Discharge

Where is deposition greatest? Inside of Curve - Point Bar Mouth of River - Delta

Why? lowest velocity

What agent of deposition? glacier - unsorted

Deposition by Streams: Graded Bedding slow SORTING - Size, Shape, Density fast slow fast

What happens to particle size? decreases Stream slows down Why?

delta What is this?

Huang He (Yellow River) - China

large decreases small

What agent? wind

What direction?

Glaciers pg 8-9 ESRT

Glaciers – 1) Alpine / Valley 2) Continental/ Ice Sheet

IV. Anatomy of a glacier A. Zone of Accumulation Blanket of snow survives summer melting Nourished by snowfall

IV. Anatomy of a glacier B. Zone of Ablation Snow and ice melt & sublimate in summer Recognized by bare ice in summer Where the glacier flows into water: Calving: ice chunks break off and float away  icebergs

Ice sheet Movement

Glacial Deposits till unsorted

Moraines

Crevasses

V. Glacial Erosion B. Landforms 5. U-shaped Valley As glaciers advance down river valleys they carve them into U-shaped valleys. Contrast to V-shaped valley formed by lateral stream erosion.

Glacial Deposits erratics

striations, grooves, and polishes Glacial Deposits striations, grooves, and polishes

Glacial Features

Drumlin

Drumlins

The Great Lakes

taughannock state falls.

No Water?? - 1969

Retreat of Niagara