Monitoring Spatial-Temporal Changes in Surface Water Quality in Balkhali Chai River Basin Leading to Yamchi Dam (Ardebil city)

One of the suitable methods for evaluating water quality is the use of water quality indicators. Qualitative indicators are a powerful management tool for different levels of decision-making. With the availability of satellite images, besides the use of field data, it is possible to study the quality of surface water with greater power and increase the dimensions and scope of the work and reduce the cost of the study. Therefore, in this research, considering Taking the mentioned cases and with the aim of investigating the spatial-temporal changes in the water quality of Yamchi Dam under the Balkhali Chai river basin and using the WQI water quality index and remote sensing, a quantitative study has been done in the area of the informed case. The area investigated in this research is under the river basin leading to Yamchi dam located in Ardabil province. Yamchi dam is closed on the path of Balkhali Chai river from the main branches of Qara-Su river. The main branches of Yamchi Dam are one of the important dams due to passing through important residential areas such as Nair and villages in the region, as well as the location of some industrial and recreational centers near the boundaries of these rivers and because of the provision of drinking water and agriculture in the region. The region is Azerbaijan. Due to the prevailing conditions and serious threats caused by industrial effluents and domestic sewage, it is always under the threat of pollution.