University of Tehran Journal of Natural Environment 2008-7764 69 4 2017 01 20 Investigation of Factor Influencing in River Gravel Extraction Problems Using Fuzzy Delphi Method Investigation of Factor Influencing in River Gravel Extraction Problems Using Fuzzy Delphi Method 1041 1059 62997 10.22059/jne.2017.125741.934 FA Journal Article 2015 06 30 Rivers are important for human beings due to abundance of sand deposits within them. The goal of this study is determine the factors influence on licensing of gravel mining from rivers of Gilan Province and its problems, finally giving suggestions about probability change the licening. Socio-economic, environmental, management, laws and regulations including 10, 26, 8 and 5 criteria, respectively are investigated. It’s wanted from experts to show their preference about the criteria and sub criteria with scale from 1 to 9. The criteria and sub criteria were ranked by using of Delphi fuzzy technique. Results show socio-economic criteria were ranked in 9 degree, environmental criteria in 4 ranks, management criteria in 6 ranks and laws and regulations criteria in 3 ranks. Keywords: Delphi fuzzy, criteria, ranking, preference, gravel extraction, rivers of Gilan Province Rivers are important for human beings due to abundance of sand deposits within them. The goal of this study is determine the factors influence on licensing of gravel mining from rivers of Gilan Province and its problems, finally giving suggestions about probability change the licening. Socio-economic, environmental, management, laws and regulations including 10, 26, 8 and 5 criteria, respectively are investigated. It’s wanted from experts to show their preference about the criteria and sub criteria with scale from 1 to 9. The criteria and sub criteria were ranked by using of Delphi fuzzy technique. Results show socio-economic criteria were ranked in 9 degree, environmental criteria in 4 ranks, management criteria in 6 ranks and laws and regulations criteria in 3 ranks. Keywords: Delphi fuzzy, criteria, ranking, preference, gravel extraction, rivers of Gilan Province https://jne.ut.ac.ir/article_62997_dc8df14c2bf3960e3bd1f18c567d942e.pdf