نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه زنجان
2 استاد دانشگاه زنجان
3 گروه جغرافیا، دانشکده علوم انسانی، دانشگاه زنجان، زنجان، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In order to investigate the hydrological response of Zayandehrood catchment to changes in land cover and land use, three statistical periods of 1994-1995, 2004-1995 and 2018-2005 were considered. Land use maps in this study were obtained using Landsat 5 and 7 satellite imagery of TM and ETM + sensors. The "Google Earth Engine" system was also used to obtain corrected satellite images. For this purpose, using the supervised classification method and the minimum distance algorithm and based on pixelated classification, images were prepared in Google Earth Engine environment and then the resulting maps were drawn in ARC GIS environment. Comparison of land use maps in the three periods showed that the level of green cover, including pasture and forest, has decreased. While the level of man-made land and agricultural land is increasing. The area of man-made lands has increased from 6.9% in the first period to 11.4% in the second period and the area of agricultural lands from 1205 square kilometers in the first period to 1332 square kilometers in the third period. Also, the area of snow cover in the second and third periods compared to the first period shows a decrease. The research results show the significant effects of land use change on river flow and basin water load. Land use changes due to human intervention have affected the flow of Zayandehrood runoff and caused its reduction. In almost all the studied stations, the amount of runoff has decreased at the end of the statistical period
کلیدواژهها [English]
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