Dunes near Pushkar – GE1 EarthCache
Hidden : 10/14/2008
Difficulty:
1.5 out of 5
Terrain:
2 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:


This cache is located near Pushkar, in semi-desert. Hills around are formed by paleozoic sandstone and quartz sandstones – there are several small quarries near the cache. Ground is formed by sands with sand dunes, which are slowly moving due to the wind. This cache is dedicated to the dunes.



Out of all the aeolian sand deposits, sand dunes are the most impressive and important features of a desert environment. A sand dune may be defined as a hill of sand deposited by wind, which rises to a single summit and possess a slip face. Sand dunes may exist single, but normally they occur in colonies. Sand dunes are found in the flat areas of a desert; such a surface is sometimes covered with coarse-grained sediments. In a sand admixture finer grains move by saltation and coarser ones move chiefly by creep, as they are too big to be lifted. On the dune you may see wind ripples - wavy surface forms on sandy surfaces whose wavelength depends on the wind strength, and remains constant as time goes on. Ripple wavelengths increase with the wind gradient, but ripples flatten out and disappear when the wind rises above a value of about three times the threshold value for the particular sand.



Wind ripples generally have straight long, parallel crests, and are asymmetrical, with high ripple indices. They may show well developed bifurcating of crests. There is a tendency for curved ripples to straighten out until they lie at right angles to the wind direction Coordinates above will bring you to one interesting dune. It is near the road, so you can walk there, but the best access is on the camel.

To prove your visit you need to answer two questions:
1) measure or estimate the height of the dune you are staying on
2) what is the predominant wind direction deduced from the orientation of the ripple marks

Send me your answers via e-mail through my GC profile before logging and I will validate your found.

Additional Hints (No hints available.)



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