A B S T R A C TMany parameters and indicators exist for the qualitative assessment of groundwater, but their importance differs according to the plain and aquifer; therefore, evaluating the appropriate parameters for quality analysis of different areas is essential. As the main objective, the most important parameters for assessment of the quality of groundwater was selected and ranked in present study using the analytical hierarchy process. The study was carried out in the Tajan plain in northern Iran. To achieve the objectives of the research, initial information was collected, a research hierarchy was formed, and a group of experts was set up. Questionnaires were distributed to the experts and the results were recorded using Expert Choice software. The decisions from the experts were combined and the final weight of each parameter was calculated to allow selection of the most important parameters. Six graphs were plotted; five ranked the criteria, anions, cations, physical factors, and microbial factors and one ranked all parameters. At the end, the quality parameters were categorized based on their final weight from most important to least important and the six parameters of highest priority (sulfate, iron, nitrate, EC, calcium, TDS) were chosen as indicators of groundwater quality in Tajan plain. It is noteworthy that the weight of each indicator parameter was higher than the average weight of all parameters.
Identifying the environmental hazards of jackup drilling rig, which is used as an exploratory drilling and offshore service platform, yet has been under intense discussion. Risk assessment along with determining the likelihood of an event occurrence and the severity of its consequences can be a useful tool for identifying the priorities and making satisfactory managerial decisions. In this study, the environmental risks attributed to jack-ups in the offshore area of Iran around the South Pars gas field were studied, and finally a new mathematical model for the environmental risk assessment in this area was presented. Due to qualitative nature of some indefinite factors, fuzzy logic was applied in this model. Moreover, the model design was tailored to the ecological and environmental conditions of South Pars gas field, and several sources of risk were aggregated for the final environmental risk assessment of jack-up drilling rig. The results indicated that the total risk calculated for jack-up in transportation was tolerable and limited management measures were required. However, for the jack-up operation risks, the site was found to be faced with ''unacceptable risk'' or requiring extensive management measures.
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