The Presentation of Environmental Risk Assessment Pattern for Gas Pipeline Project by Using of Indexing System and AHP Methods (Case Study: Transportation Pipelines 24 inches, Tasuj-Salmas Project)

Subject Areas : environmental management

Sahar  Rezaian ¹ (Assistant Professor, Department of Environment and Natural Resources, Faculty of Technical & Engineering, Islamic Azad University, Shahrood Branch)
Mahdi  Irankhahi ² (PhD Student, Environmental Science, Course of Master Science, Faculty of Environment and Energy, Tehran Islamic Azad Sciences & Researches University. Member of Young researchers and elite)
Seyed Ali  Jozi ³ (Assistant Professor, Department of Environment and Natural Resources , Faculty of Technical & Engineering, Tehran Islamic Azad University ,North Branch)

Received: 2009-07-27 Accepted : 2010-06-19 Published : 2014-09-23

Keywords: Environmental risk assessment, Indexing System, Analytical hierarchy process, Gas pipelines, Geographical information syste,

Abstract :

Gas transportation pipelines production plans, unlike technical and economical justification in the fieldof energy supplying for societies, by having danger on environment, needs the continuous studies ofassessment and environmental risk management in manufacturing and benefiting stage. In this study,for purpose of environmental risk assessment for gas transportation pipelines the indexing systemmethod and Analytical Hierarchy Process were combined. Indexing System is a compulsive andapplicable method that was based at the basis of characterizing index effect and ranking. By using thismethod, we can classify, quantify and prefering types of environmental risk in pipelines according tothe determined criteria’s and typical. In the mentioned method, typical of dangers, show the possibilityof danger occurrence and effects of typical show the effect intensity. Final grade for environmentalrisk in this method produce via possibility of danger occurrence multiply with effect intensity.According to that efficiency scale for whole of criteria are not equal in the final level of risk.In addition for the purpose of weighting the criteria’s, the Analytical Hierarchy Process was used andfor the purpose of weighting the digital layers of information related to the criteria Ordered WeightAnalysis method was used. For the purpose of examination results of this research, environmental riskassessment of gas transportation pipelines 24 inches for Tasuj-Salmas with approximate length about42 kilometer as a case study was exerted. Via usage of Geographic Information Systems abilities, theidentified risks and risk zonation in the path of pipelines were considered. Results showed that 46% ofgas pipeline path of Tasuj-Salmas, has a high risk level (5467- 6054 grade), 48% of it, has a mediumrisk level (6055- 6641 grade), 2% of it, has a low level of risk (6642-7228 grade) and 4% of it, has alittle risk (7228< grade). Adjacency of southern zone of pipelines path with Orumieh lake nationalpark, 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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