List of Articles Alluvial Fan

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  1 - Road Construction and Geomorphic Instability in Deserts
  سیدرضا Hosseinzadeh
  Vest parts of the central and eastern of Iran are covered by mountain basin-rangedeserts. These deserts have developed during the quaternary alternating between dryand wet climatologically conditions, and now that earth is going through aninterglacial age, they are pass More

  Vest parts of the central and eastern of Iran are covered by mountain basin-rangedeserts. These deserts have developed during the quaternary alternating between dryand wet climatologically conditions, and now that earth is going through aninterglacial age, they are passing through a dry period. In such conditions, when thedesert landforms seem to be stabilized for short periods; rapid changes take place indesert geomorphic systems due to human-induced changes in the environment.Road construction has a great impact in deserts than the other human activities. Thisarticle, using air photos and satellite images and, particularly, field data, discusses theeffect of road construction on geomorphic instability of alluvial fan surfaces, playa anddesert pavements. The results show that:1. Road construction operations carried out on the surface of dry alluvial fans changethe equilibrium profile of main and secondary channels, resulting in intense verticalerosion;2. Road construction carried out in playa environments disrupt the balance of waterand sediments of surface streams and the terminal basin, bringing about changes inlandform boundaries.3. Road construction operations carried out on desert pavements in the resumption ofdeserts, causing wind deflation. Manuscript profile
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  2 - The Assessment of Tectonic Movements on Northeastern Slopes of Karkas Mountains By The Use of Geomorphic Indexes
  masomeh Rajabi somayyeh khosravi
  The Northeastern slope of Karkas Mountain is regarded as part of the Karkas mountain range which is located in south west of Natanz County and has spread along northwest-southeast directions. The study area has been placed in volcanic stretch of Urmia-Dokhtar (Tabriz-Ba More

  The Northeastern slope of Karkas Mountain is regarded as part of the Karkas mountain range which is located in south west of Natanz County and has spread along northwest-southeast directions. The study area has been placed in volcanic stretch of Urmia-Dokhtar (Tabriz-Bazman) area. Shrew and Schtoklin (quoted in Paroohan, 2001), have announced this area to be a broken and active axis with regards to volcanism (during upper Cretaceous-Eocene) and plutonic (Oligocene and Miocene).The main fault of the area is part of Qom-Zafreh fault being started from south west of Natanz and continues toward Zafreh. It is a right-lateral strike-out fault which has dug out quaternary alluviums in the northern Natanz.The displacement of water courses is usually right-oriented and the youngest fault is seen due to this mechanism in young alluvial fans of south west heights of Kashan.For the recognition of tectonic activities in the area under study we have used various geomorphologic indexes such as the mountain front congregation, length gradient of the river, the ration of valley bottom to its height and the morphometry of alluvial fans.Results obtained indicate that Northwestern slopes of the Karkas Mountains are still tectonically active. Manuscript profile
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  3 - Prioritization of Morphometric Factors Influencing the Creation Alluvial Fans Southern Slopes of Alborz, in the Semnan Province, Using Multivariate RegressionModels
  عیسی Jokar sarhangi رضا Esmaeili سمیه Fakhroddin
    There are relations between water basins and alluvial fans as important forms in arid and semi an arid region which show the dimensions of alluvial fans and also indicate the impacts of different factors in the formation of alluvial fans quantatively. With r More

    There are relations between water basins and alluvial fans as important forms in arid and semi an arid region which show the dimensions of alluvial fans and also indicate the impacts of different factors in the formation of alluvial fans quantatively. With respect to the fact that the dimensions of alluvial fans are under influence of their  morphometric factors of watershed basins; this research used morphmetrical  features to find the most suitable model in the southern slops of  Alborz Semnan province. For this purpose, 44 water basins and alluvial fans associated with them were determined using 1:500000 topographic maps. Also for more accuracy Google Earth Pro6 software, were used. In the next stage, 11 watershed physiographic characteristics were obtained including: area, perimeter, mean of height, elevation, gradient, basin length, total length of waterways, and length of the main channel, basin shape coefficient, main channel gradient, and drainage density with the help of Geographic Information System (GIS). Then relationship between alluvial fans Dimension as a dependent variable with the quantities of basin morphology as independent variables were analyzed using SPSS software and multiple regression. The results indicate that  among the independent factors,  the variables of area, perimeter, length, area, channel length, main channel length and the density of water drainage basins, had the most influence on the development of alluvial fans respectively and able to find a regression model. Manuscript profile
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  4 - The effect of active tectonic to the morphology of Derakht Tangan River fan of Shahdad in the west of lut (Iran)
  Somayeh Sadat Shahzeidi Tooba Panahi
  10.30495/jonass.2021.1922292.1004
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