Lecture 15
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Lecture 15 Deserts and Wind Action. Lecture Outline. IDeserts A)Characteristics B)Distribution C)Southwest United States i.The Great Basin ii.The Colorado Plateau IIWind Action A)Erosion B)Transportation C)Deposition IIIConclusions. Lecture 3 ii.

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Lecture 15 Deserts and Wind Action

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Lecture 15 deserts and wind action

Lecture 15

Deserts and Wind Action


Lecture 15 deserts and wind action

Lecture Outline

IDeserts

A)Characteristics

B)Distribution

C)Southwest United States

i.The Great Basin

ii.The Colorado Plateau

IIWind Action

A)Erosion

B)Transportation

C)Deposition

IIIConclusions

Lecture 3

ii


Lecture 15 deserts and wind action

Characteristics of Deserts

< 25 cm rain per year

sparse rugged vegetation

two climatic types

arid deserts

semiarid steppes


Lecture 15 deserts and wind action

Distribution of Deserts


Lecture 15 deserts and wind action

Climate ControlsSolar Radiation and Heat Transfer


Lecture 15 deserts and wind action

Climate ControlsAtmospheric Heat Transfer

Three Cell Model

Hadley Cell

Ferrell Cell

Polar Cell


Lecture 15 deserts and wind action

Climate ControlsOceanic Heat Transfer


Lecture 15 deserts and wind action

Climate ControlsOceanic Heat Transfer – Thermohaline Circulation


Lecture 15 deserts and wind action

Distribution of Deserts

Controlling Climatic Factors

Atmospheric Circulation

Rain Shadow

Cold Ocean Currents

Continentality


Lecture 15 deserts and wind action

Distribution of DesertsAtmospheric Circulation


Lecture 15 deserts and wind action

Distribution of DesertsAtmospheric Circulation


Lecture 15 deserts and wind action

Distribution of DesertsAtmospheric Circulation - The Sahara


Lecture 15 deserts and wind action

Distribution of DesertsRain Shadow


Lecture 15 deserts and wind action

Distribution of DesertsRain Shadow - The American Southwest


Lecture 15 deserts and wind action

Distribution of Deserts

Cold Ocean Currents


Lecture 15 deserts and wind action

Distribution of DesertsCold Ocean Currents - The Namib

Sea Surface Temperature (oC) - 03/17/02

Naval Research Laboratory, Stennis Space Center

http://www.ocean.nrlssc.navy.mil/global_ncom


Lecture 15 deserts and wind action

Distribution of DesertsCold Ocean Currents - The Namib


Lecture 15 deserts and wind action

Distribution of DesertsContinentality - The Gobi


Lecture 15 deserts and wind action

Deserts of the American Southwest

The Great Basin (Basin and Range)

The Colorado Plateau


Lecture 15 deserts and wind action

Deserts of the American Southwest

Water Bodies – Arroyos


Lecture 15 deserts and wind action

Deserts of the American SouthwestThe Great Basin

rugged mountain ranges

separated by flat valleys

fault-controlled topography


Lecture 15 deserts and wind action

Deserts of the American SouthwestThe Great Basin


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestThe Great Basin


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestGreat Basin Landforms - Alluvial Fan

alluvial fan - an outspread, gently sloping mass of alluvium deposited

by a stream, particularly in an arid or semi-arid region

where a stream issues from a narrow canyon onto a plain

or valley floor.


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestGreat Basin Landforms – Bajada

bajada - a broad, gently inclined detrital surface extending from the base

of a mountain range out into an inland basin, formed by the

lateral build-up of a series of alluvial fans.


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestGreat Basin Landforms - Playa

playa - a dry, barren area in the lowest part of an

undrained desert basin.

playa lake - a shallow, intermittent lake in an arid

region.


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestGreat Basin Landforms - Pediment

pediment - a broad gently sloping erosion

surface or plain of low relief,

typically developed by running

water, in an arid or semiarid

region at the base of an abrupt

and receding mountain front.


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestGreat Basin Landforms – Inselberg


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestGreat Basin Landforms Evolution


Lecture 15 deserts and wind action

Deserts of the American SouthwestThe Colorado Plateau

beds of flat-lying sedimentary rocks

>1500m above sea level due to uplift

marked by monoclines


Lecture 15 deserts and wind action

Deserts of the American SouthwestColorado Plateau Landforms

plateau- a relatively elevated area of comparatively flat land bounded on

at least one side by cliffs

mesa - a broad flat-topped hill

butte - a narrow hill of resistant rock with a flat top and very steep sides


Lecture 15 deserts and wind action

Desert Landforms of the American SouthwestThe Colorado Plateau – Monocline

monocline - a local steepening in an otherwise uniform gentle dip


Lecture 15 deserts and wind action

Wind Action

Erosion

Transport

Deposition


Lecture 15 deserts and wind action

Wind ActionErosion


Lecture 15 deserts and wind action

Wind ActionErosion - Blowout


Lecture 15 deserts and wind action

Wind ActionErosion - Deflation


Lecture 15 deserts and wind action

Wind ActionErosion - Ventifacts


Lecture 15 deserts and wind action

Wind ActionTransportation


Lecture 15 deserts and wind action

Wind ActionTransportation - Dust Storms


Lecture 15 deserts and wind action

Wind ActionDeposition – Dunes


Lecture 15 deserts and wind action

Wind ActionDeposition – Dune Migration


Lecture 15 deserts and wind action

Wind ActionDeposition – Dune Morphology


Lecture 15 deserts and wind action

Wind ActionDeposition – Controlling Factors on Dune Morphology


Lecture 15 deserts and wind action

Wind ActionDeposition - Barchan Dunes


Lecture 15 deserts and wind action

Wind ActionDeposition – Transverse Dunes


Lecture 15 deserts and wind action

Wind ActionDeposition – Barchanoid Ridge Dunes


Lecture 15 deserts and wind action

Wind ActionDeposition – Star Dunes


Lecture 15 deserts and wind action

Wind ActionDeposition – Parabolic Dunes


Lecture 15 deserts and wind action

Wind ActionDeposition – Longitudinal Dunes


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