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Work of WindWeathering, Erosion and Deposition

Under the supervison of

Ms. Sarita Mann

A presentation by

Arkaprabha Sarkar

Department of Geology

Kurukshetra University Kurukshetra

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Aridity Average annual precipitation

Hyper arid 12 consecutive months ithoutrainfall

!rid "ess than 2#$mm rainfall%emi arid 2#$$$mm rainfall

!eolian activity is commonly o'served in hyper arid, arid andsemi arid regions ()eigs, 1*#$+UE- introduced classi.cation of inde/ of aridity

0nde/ of aridity -otential evapotranspiration!verage annualrainfallWork of ind

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Weathering Action of Wind

Dierential heating of rocks3ocks ith heterogeneous composition tends toe/pand or contract une4ually due to di5erent

coe6cients of thermal e/pansion7 3epeatedune4ual e/pansion or contraction developsfractures7

Sandblasting& Head on 'lasting& !ttrition& !'rasion

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Particle Entrainment

%urface creep

%altation

"ocal suspension

3egional suspension

8hreshold velocity for entrainment is fairly high for clay and siltsi9ed particles and decreases ith increase in grain si9e:alue of threshold velocity is least for coarse sand particles:alue of threshold velocity for particles larger than coarse sand

increases ith grain si9eWork of ind

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Process of Sediment

ransport %uspension %altation

%urface creep& %liding& 3olling

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Modelling of Wind Erosion

Wind Erosion E4uation (;hepil+E f (0, ;, K, ", :+

E < soil loss 'y ind0 < erodi'ility of soil

; < factor of local ind pattern

" < idth of .eld in the direction of ind: < :egetation inde/

Work of ind

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AE!"#A$ "A$D%!&MS

Erosional landforms

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%ormed due to WindErosion

:entifact

Work of ind

Dreikanter

$$

=ardang

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>eugen

Hard

)edium

%oft

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AE!"#A$ "A$D%!&MS

Depositional "andforms

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Depositional "andforms

3ipples

Dunes

& ?archan& -ara'olic& "inear& 8ransverse

& %tarWind direction varia'ility

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-ara'olic dunes

?archan

8ransverse dunes

"inear dunes

%tar dunes

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%huttle 3adar 8opography )ission (%38)+

*$m Digital Elevation )odel

8har desert, Western 3a@asthan

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Migration of Dunes

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&eferences Glo'al Geomorphology < )ichael !7 %ummer.eld

Aundamentals of Geomorphology < 3ichard Bohn Hugget, 2ndEdition (2$$C+

Understanding Earth