چکیده:
Large areas of Iran are under the influence of wind erosion thus it is important that we recognize three zones of
removal, transportation and deposition. The deposition zone is very important due to more damages and tangible
effects. In this study we try to obtain a comprehensive idea to Persian desert with use of laboratory facilities, remote
sensing, GIS and field surveying. We survey 28 ergs in this study that they have 6410600 ha area. Area of sand dune
is 4172500 ha and we analysis 66 samples from them. the range of grain size is 4000 micron to less than 62 μ. 11%
from samples have max grain size of 4000 μ, 3% 1700 μ, 5% 1180 μ13% 600 μ, 58% 300 μ, 9% 150μ, 2% 62μ. 28%
samples had min grain size of 75μ, 13% 62μ, and 59% less than 62μ. 3% samples had mod of 600μ, 3% 300μ, 59%
150μ, 30%75μ and 3% 62μ. The samples were transport 1 to 5 km, 2% were transport 5 to 20 km, 72% were
transport 20 to 50 km and 23% were transport 50 to 200 km. skewness coefficient of normal charts are -0.2 to 2.95
and most coefficients is in range of 2 that shown fine grain.
خلاصه ماشینی:
The shape of sand grains results of samples in the area of dunes are shown that there are 20% water erosion and 78% wind erosion.
Table 1 Area of Iran Ergs No. Name Area (ha) 1 Oman 277682 2 Iranshahr- Bampour- Jazmoorian 277682 3 Fahraj- Bam 51808 4 Hamoon 18338 5 Loot 1174518 6 North Loot 85962 7 Akbar Abad 10541 8 Mohamad Abad 20212 9 Ghaen- Shahrakht- Ahangaran 292968 10 Boshravie- Gonabad 277682 11 Taybad 17001 12 Tabas 31699 13 Sabzevar- Davarzan 266487 14 Damghan 14212 15 Kavir Namak 267037 16 Khoor Biabanak 126978 17 Mehriz- Yazd 48946 18 Dashte Kavir 546464 19 Rigbolande Kashan-Qom 231397 20 Booralane Makou 1600 21 Rig zarrin 68257 22 Khoozestan 149784 23 Gav khooni 45822 24 Saghand- Deraanjir 12153 25 Zarand- Neyriz- Bafgh 15420 26 Kerman- Rafsanjan- Noogh 104210 27 Sirjan- Shahr babak 104775 Total 4539634 3.
Hamoon Erg These sand dunes are located in the east of Iran near border line of Iran and Afghanistan in longitudes 60º 56' to 61º 10' E and latitudes 30º 00' to 31º 25' N.
Kavire Namak Erg These sand dunes are located in the central of Iran in longitudes 56º 40' to and latitudes 34º 05' to 33º 00'.
shape of sand grains characteristics of Koozestan Erg range of chemical Name Mod (µ) grain sizes (µ) Mean (µ) skewness abrasion coefficient physical erosion% water erosion% wind erosion% Ahvaz 130Km 150 600-<62 2.