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Spatial modeling of seismic vulnerability of urban buildings with an emphasis on the impact of groundwater table using rough set theory
Yasaman Asadi Miss, Najmeh Neisani Samani Dr , Majid Kiavarz Moghadam Dr, Ataolah Abdolahi kakroodi Dr, Meysam Argani Dr
Abstract:   (44 Views)
Tehran has high seismic ability with active and numerous faults and intense earthquakes. Earthquake is a natural disaster. Tehran as the capital and center of the country's material and spiritual capital, is in danger of severe earthquake risk based on earthquake hazard zoning map. In addition to old and unstable buildings in Tehran, another matter that make this city so vulnerable against earthquake is soil liquefaction phenomenon due to the high level of underground waters in some areas.  Since most of soils are alluvial in the city of Tehran, the buildings that are resistant against horizontal force of the earthquake will be collapsed. The aim of this study is to spatial modeling of seismic vulnerability by considering the influence of the depth of the groundwater levels and effective criteria in physical seismic vulnerability (ground and underground agents) and human factors. Determination of location and extent of the vulnerability has more uncertainty than the earthquake risks because of it's dependence on different parameters and experts opinions. In this study to optimize the basic information and determine the rules for decision making and achieve results with relatively high accuracy in terms of the uncertainty, we used mathematical method of rough sets. Municipal districts of 11, 16 and 20 of Tehran is studied in this research. These districts are affected by four major faults in Tehran and have a higher vulnerability. In this study the vulnerability is divided in five levels of very high, high, medium, low, very low. The research results show the vulnerability is increasing from north to south due to depth decrease of the groundwater level and its vulnerability level is very high.
Keywords: Earthquake, soil liquefaction, Tehran, groundwater, seismic vulnerability, rough sets.
     
Type of Study: Research | Subject: GIS
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نشریه علمی پژوهشی علوم و فنون نقشه برداری Journal of Geomatics Science and Technology