M Abasi; S Bagheri Saidshokri; M Jafari Aghdam
Abstract
The Noa Anticline is located in west part of KermanshahProvince and due to extension of limestone formations, existing of faults and joints, and also climatic conditions of the area involves an evolved karst. This study carried out to recognize the karstic evolution process and zonation as well as the ...
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The Noa Anticline is located in west part of KermanshahProvince and due to extension of limestone formations, existing of faults and joints, and also climatic conditions of the area involves an evolved karst. This study carried out to recognize the karstic evolution process and zonation as well as the impact of different factors on the process of karst developing in the Noa anticline. The data gathered for this study are topographic, geological, soil, land use, aerial, and satellite maps and also climatological statistic data. In this study, nine environmental factors as independent parameters and karst features geomorphology as a dependent parameter were examined. Then, with intensive field works, we recognized the closed holes as the most evolutionary ones of karst features of this area, and concerning the characteristics of these landforms, a proper weight was given to each parameter. Finally, by using GIS software, we prepared overlap maps and in a final manner using Entropy model, adaptation of factors and definitive modification have been performed. The results of this study show that this area embraces four categories of Karsts include lack of karst evolution, moderate evolution, high evolution and very high evolution categories. Regarding nine factors, five factors such as distance from fault, slope, slope aspect, temperature and rainfall recognized as the most effective ones and other factors such as soil factor, land use, contour lines and lithology as with no effect on area’s karst is recognized. The model preciseness applying on the closed holes shows that there are 92 % closed holes in the two categories (high evolution and very high evolution) and have indicated the favorite effectiveness of using Entropy model on the karst evolution zonation.
B Azadbakht; M Zareinejad
Abstract
Water causes erosion of different forms in nature and creates diverse landforms on the earth’s surface depending on the manner it appears in nature. Although water is itself a former factor, it flows under the morphological effect of earth’s surface (Ramasht, 2005). The difference of earth’s ...
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Water causes erosion of different forms in nature and creates diverse landforms on the earth’s surface depending on the manner it appears in nature. Although water is itself a former factor, it flows under the morphological effect of earth’s surface (Ramasht, 2005). The difference of earth’s surface topography and its consequent of water movement on it, cause the formation of sub-basins. In order to recognition of morphology and morphometry of Damavand cone, the region drainage basins must be distinguished. Therefore, in this study 5 drainage basins were identified based on the main criteria including topographic contours with 10 m intervals, drainage system (main and subsidiary rivers, main and subsidiary streams), DEM map of the region, slope map, aspect map and satellite images. Area, perimeter, height classification for classifying the morphological landforms in different levels, hypsometric, drainage density, etc. were then calculated by using the ArcGIS software. The Damavand cone, with a height more than 5,000 m above the sea level, has a very hard-pass slopes. Our purpose in this paper is to identify the effect of drainage basins conditions on the erosion and formation of geomorphological landforms by using of SPOT and ASTER satellite images as well as data analysis o in GIS environment.
B. Azadbakht; M. Zareinejad
Abstract
Takht-e-Solayman zone is highly rich from the viewpoint of diverse morphological units. This morphological diversity is mostly caused by climatic factors and lithological characteristics, erosion, weathering processes and tectonic movements. Geomorphologic characteristics of Takht-e-Solayman zone are ...
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Takht-e-Solayman zone is highly rich from the viewpoint of diverse morphological units. This morphological diversity is mostly caused by climatic factors and lithological characteristics, erosion, weathering processes and tectonic movements. Geomorphologic characteristics of Takht-e-Solayman zone are influenced by internal and external morphodynamic factors. As a geomorphologic-environmental achievement, this research has been dealt with the investigation of external factors. The available morphologic indications in the study area are divided into 3 general groups including morphodynamic, morphotectonic and morphogentic units and then presented in the form of a geomorphologic map. For this purpose, several new information layers of the zone are prepared in GIS environment using basic maps and field investigations and finally the landforms evaluated using ASTER and ETM+ satellite images.