Document Type : مقاله کوتاه


1 Islamic Azad University, Shahrood Branch

2 Faculty of Technical and Engineering, Islamic Azad University, North Tehran Branch

3 Faculty of Environment and Energy, Tehran Sciences & Researches University


In this study for purpose of environmental risk assessment for gas transportation pipelines, combined the indexing system method and AHP. Indexing System is a compulsive and applicable method that was based at the basis of characterizing index effect and ranking. For the purpose of weighting the criteria’s, the AHP was used and for the purpose of weighting the digital layers of information’s related to the criteria’s, Ordered Weight Analysis method was used. Via usage of GIS abilities, the identified risks and risk zonation in the path of pipelines. Results showed that 46% of gas pipeline, has a high risk (5467- 6054 grade), 48% of it, has a medium risk (6055- 6641 grade), 2% of it, has a low risk (6642- 7228 grade) and 4% of it, has a little risk (7228< grade). Adjacency of southern zone of pipelines path with Orumieh lake national park, is an important ecological sensitivity that is under investigation. 15 kilometer of pipeline path (kilometer 18+220 to 33+220) is aligned with 5 kilometer of biosphere reserved.


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