Instability of wind accumulate forms, case study: lut plain
Subject Areas : Geopolitic
1 -
Keywords:
Abstract :
In this essay in order to done studies and new observation will discuses to stability of wind accumulate morphs in lut plain. The activity of wind morphs in comparison together can be different due to their nature. In this essay discus that lut plain Barkhans due to their condition and nature are more active than other morphs. So, they have more unstable ability. This essay is based on comparative method in nature of morphs, and has prepared with using of 1/100000 land set images, 1/50000 topography maps,1/100000 geology map, wind-gauge data of region stations and 1/5500 air photo. Its analysis is based on some observations in Google Earth and local observations. In this essay are emphasized 4 types of morphs including: Barkhans, length duns, wide dunes and Ghourd which are abundant in lut plain, and in images scale and used pixels. The vast part of west section in east mountain of lut plain (the east part of central lut plain) and south and south-west of this plain is covered differently by wind sand, this morphs have different high. The high of Ghourds (from floor) are about 475m. Sand duns almost have very slope head-line over the less slope, and it is indication for changing role of present winds. Between the some sand duns, specially in Ghourds, the seasonal water-remains are increasing. This increas show that sand duns in its floor also are affected by seasonal sub-surface flows. Where the Barkhans have been accumulated, erosion surface not seen on the Barkhans how had been cut it and the affect of seasonal water-remains there isn’t in the base-level, and even in some parts, Barkhans formed on the aged erosion valleys, that is, they prepared the wind cycle surface (aged erosion-new accumulation).So, presents the newer activity, and based on and by attention to criterions which presents in the essay text, in comparison with Ghourds, length and width, duns Barkhans are more unstable.