ارزيابي تغييرات محيطي در حوضه درياچه بختگان

Environmental changes are among the most important challenges of the recent century. Environmental changes are rooted in natural and human factors. Due to its strong dependence on changes in the type of land cover, land surface temperature (LST) can reflect environmental changes in a geographical area. This research was conducted with the aim of investigating and eva‎luating environmental changes in the Bakhtegan Lake basin with the help of LST changes. To achieve the research objectives, "MODIS Aqua" LST data were used, in two data per day and for the period from 2002 to 2020. Linear regression trend test was used to eva‎luate LST changes. The results showed that environmental changes can be detected in different parts of the basin from LST changes. The trends of increasing LST during the day are mostly due to water shortage and dryness of rivers, wetlands and lakes. These types of changes are observed along the Shadkam River valley to Lake Kaftar. Also, Bakhtegan, Tashk and Maharlu lakes were also facing an increasing trend of LST during the day. Decreasing trends in night-time LST were also observed in the area of Lake Kaftar, Bakhtegan, Tashk, and around Maharloo. However, increasing trends in night-time LST are due to the expansion of urban heat islands, especially in Shiraz, due to the development and expansion of agricultural lands downstream and upstream of the Dorudzan Dam to the Mulla Sadra Dam, and finally the construction of the Mulla Sadra Dam in the Tang Baragh area.

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