Journal of Spatial Analysis

Earthquakes as one of the most important natural disasters on earth, have always caused irreparable damage to human settlements in a short period of time. Severe earthquakes have led to the idea of developing an infrastructure plan to reduce the risks and damages caused by it. The urban water supply system is the most important critical infrastructure that is usually damaged by natural disasters, particularly earthquakes and floods; hence, the function of the pipelines of the water system determines the degree of resilience and design of the infrastructure against multiple natural and man-made hazards. Water network pipelines are the most vulnerable. In this regard, seismic modeling and spatial analysis of the effects of seismic urban water supply network in Tehran were investigated and seismic indices PGV, PGD.PGA of Tehran were calculated and the extent of the area's vulnerability was carefully evaluated. The ANP model was also used to weight the above indices. Questionnaires were prepared and completed by experts in the field of research in order to investigate the interactions between the criteria in terms of their effectiveness or susceptibility. The ANP conceptual model was developed and implemented in SUPER DECISION software. After drawing the hazard status, the calculation of the water supply network vulnerability using SAW method was considered and earthquake risk status on the water supply network was calculated. To calculate the earthquake risk based on R = H * V, the values of these two components (seismic power, vulnerability) are multiplied. This calculation was performed in GIS software on the layers of vulnerability and the final result of this calculation was shown in the amount of risk map. The calculated risk level for the entire water transmission network due to earthquakes has been shown. The results show that more than half of the transmission line network is located in the low risk zone and about 33 percent of transmission networks are in a relatively low risk zone. But high-risk and very high-risk areas account for about 20 percent of Tehran's total area, which is relatively large and will involve many neighborhoods

Keywords: Hazard, Earthquake, Tehran City, Vulnerability, Risk

     

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