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Evaluation of Population Distribution Pattern and its Vulnerability in Watersheds using the spatial information system (GIS)
Abstract:   (41 Views)
This research has been conducted with the aim of providing a strategy for studying the effects of different factors on population distribution patterns and probable vulnerabilities on the population living in watersheds using the capabilities of the spatial information system (GIS).  The Qarnqo basin in the East Azarbaijan province has been studied in this study. Based on the research method, first the main factors affecting population distribution including elevation, slope, fault, rainfall, land use, landslide, distance from road and water were selected and then the data and spatial information related to the mentioned factors along with the population statistics were collected from different sources. For spatial processing, various GIS functions were used, and statistical processing was performed with the available spreadsheet facilities. Based on the results, the population and number of villages in the area during the past 15 years (from 1997 to 2012) have decreased about 33 and 15 percent, respectively. Over time, the population of the mountainous areas and the slopes of the watershed have reduced and instead the population of the plain regions has increased. Also, the distance between the villages of the watershed has increased from waterways. The highest population is distributed in the dry land and irrigated and orchards and rangelands were ranked as second and third. The number of villages and population of the watershed in areas with slopes and landslides have reduced, and in some cases the population and the villages from the vulnerable areas have eliminated. Although the majority of the population in the field of study was far from fault threats, howevere, about 36% of the population must be protected against the risk of an earthquake resulting from the faults. In general, the process of population changes in the watershed has mainly been in a way that to reduce the threats posed by natural and geomorphologic factors. It seems that there is a form of compromise between the population of the watershed and its natural factors in order to preserve life and the possibility of exploiting the resources of the watershed. At the end, some suggestions were made to improve the assessment of population in watershds. 
Keywords: Environmental Factors, Fault, Garango Watershed, Landslide, Road, Slope and Waterway
     
Type of Study: Research | Subject: GIS
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نشریه علمی پژوهشی علوم و فنون نقشه برداری Journal of Geomatics Science and Technology