Local analysis and nebka's shape in order to study wind erosion and soil conservation (Case study: Miankaleh, southeast of Caspian sea)

In order to study and evaluate wind erosion, despite experimental formulas and field measurements, nebka analyzing by natural methods is a suitable and cost reduced way. Considering significant distribution of nebkas in Miankaleh coastal barrier system, southeast of Caspian sea,31 nebkas were analyzed in 4 geographical zones from east to west, in order to measure and monitor their functions.In each nebka morphometric parameters such as long axis length, short axis length and height were measured. Also, Nebka' s concentration per 100 m2, stabilization percentage and dominated biological cover were analyzed. Because nebkas in zone 3 were higher than other zones and Nebka's stabilization is less than 50 percent, wind erosion in this region is more than other regions and zone 3 is considered as a prefered region for projects. Textural parameters in sand sediments such as average size, sorting, skweness and kurtosis were determinded. Results show that textural parameters are not different from each other in 4 zones. Nebka sediments were classified texturally in medium to small average size, very well sorted, positive skewness and leptokurtic sediments. Local distribution shows the pattern of wind erosion and ways of soil conservation.