جستجوی مقالات مرتبط با کلیدواژه « نرم افزار ArcGIS » در نشریات گروه « زمین شناسی »

Rasht City is capital of Gilan Provence and is considered as one of the metropolitans along the south coast of the Caspian Sea. In terms of geological setting, the city is situated to the north of the Alborz Mountains and in the Gorgan-Rasht sedimentary zone. The area is characterized by many active faults, with the Khazar fault being regarded as the most effect one, which can produce a gravity acceleration of 0.3g for a major earthquake. According to geotechnical data from exploration boreholes, the ground surface along Line 2 of Metro in the city comprises mainly a sequence of silts and clays with interlayers of gravel and sand. Due to high level of groundwater table, abundance of fine-grained soils, high seismicity potential, and production of ground vibration during movement of the train, liquefaction can be expected to occur along the Metro line. The aim of this paper is therefore to evaluate the liquefaction hazard potential along the Line 2 of Metro of the Rasht City by preparing a hazard zonation map. Liquefaction hazard zonation mapping was carried out using data gathered from 14 exploration boreholes drilled to a depth down to 40 meters integrated into Analytical Hierarchy Process (AHP) in the GIS modelling system. In this regards, five layers of information including soil type, SPT number, overburden pressure, plastic index and maximum gravity acceleration were considered. The results indicate that the range of liquefaction hazard varies between low to very high, and the maximum rate of liquefaction is expected in BC2 and I2 stations (Sazeman-e-Ab and Husain Abad areas, respectively). Soil type and groundwater table are recognized to be the most effecttive agents in inducing potential liquefaction.

Slope instability is regarded as a worldwide problem that has direct effect on human life and the environment. The human intervention in nature by building structures and disrupting natural causes increase in the number of landslide event. Landslide hazard zonation mapping is considered to be one of the most reliable methods for evaluating the potential of landslide event along road. These maps can provide in the way of useful information in relation to the identification of high risk areas offer and accordingly, stabilization methods proposed to prevent such risks. In this study, maps of hazard zone landsliding were produced, by using fuzzy logic in ArcGIS and IDRISI along Kan–Suleghan road. Then, in order to assess the accuracy and efficiency of different operators, for creating better results, the fuzzy method was used. Based on studies, revealed the effects of tectonic factors such as faults is most effective parameter. In zoning maps, risk of landslide with fuzzyoverlayOR, the scope of present landslides in the region compared to the area with possibility of landslide occurance in the maps have been showed the good matching. So, in the paper, area it is suggested to prevent construction projects in area with high probability of landslides.