Payame Noor University Journal of Urban Ecology Researches 2538-3930 3 6 2014 11 10 The investigation of coastline changes in Urmia Lake water level and its impact on the urban of its basin The investigation of coastline changes in Urmia Lake water level and its impact on the urban of its basin 103 116 2127 FA Batool Zeinali Assistant of Climatology, University of Mohaghegh Ardabili Sayyad Sayyad Asghari- Saraskanrod Assistant of Geomorphology, Urmia University Journal Article 2015 02 03 The purpose of this study was to investigate the changes in Urmia Lake water level as well as to determine the main factors in the reduction of Urmia Lake water through the multivariate statistical method of principal component analysis (PCA) and its effect on the urban around of Lake. For this purpose, Landsat satellite images besides the data obtained from 29 variables in the statistical periods between 1970 and 2005 have been used. These variables include climate data, and monthly discharge of total basin and tourism situation of basin urban certainly Urmia. From the images, it can be recognized that the coastline has receded, particularly in East and South East, over the past 35 years (1975-2009). By the use of principal component analysis, six components with %78.8 of the total variance among the factors under study were identified as the main factors in the reduction of Urmia Lake water. The discharges in January, February, March, November, and December with %38.8 of the total variance were determined as the first component. Result indicated that The reduction of water level in Urmia Lake will cause many problems spatially in urban that are in distance of 40 KM Urmia Lake and also theirs that have wind direction of west and south west and are in east of lake. Grade of Urmia tourism has changed from one to four.  The purpose of this study was to investigate the changes in Urmia Lake water level as well as to determine the main factors in the reduction of Urmia Lake water through the multivariate statistical method of principal component analysis (PCA) and its effect on the urban around of Lake. For this purpose, Landsat satellite images besides the data obtained from 29 variables in the statistical periods between 1970 and 2005 have been used. These variables include climate data, and monthly discharge of total basin and tourism situation of basin urban certainly Urmia. From the images, it can be recognized that the coastline has receded, particularly in East and South East, over the past 35 years (1975-2009). By the use of principal component analysis, six components with %78.8 of the total variance among the factors under study were identified as the main factors in the reduction of Urmia Lake water. The discharges in January, February, March, November, and December with %38.8 of the total variance were determined as the first component. Result indicated that The reduction of water level in Urmia Lake will cause many problems spatially in urban that are in distance of 40 KM Urmia Lake and also theirs that have wind direction of west and south west and are in east of lake. Grade of Urmia tourism has changed from one to four.  https://grup.journals.pnu.ac.ir/article_2127_d0998eb07fd43d773a5d1fbac14edabb.pdf