Investigating the Chlorophyll Index of Water in the Inlet Rivers of Anzali Wetland Using Sentinel Satellite

pollution of water resources and the increase of pollution in natural water resources such as lakes and wetlands, considering their fragile nature, as one of the crises facing the country, in addition to the inflow factors, depends on the quantitative situation in aquatic ecosystem itself. On the other hand, the important problem of Anzali wetland as the area studied in this research is the increasing pollution of its water in the fragile conditions of climate change. Therefore, considering the main problem raised for Anzali wetland, the aim of the research was to investigate the water quality index in the inlet streams of Anzali wetland. .

in this research, in order to collect the required information in the period of 2019-2019 in the study area of Anzali wetland, the monthly rainfall statistics of different meteorological stations from the General Directorate of Meteorology and Statistics and geological maps and the characteristics and values of the hydraulic coefficients, wetland extension limits, possible observation station data, seasonal and permanent rivers' measured rivers’ flow data, tolls and rivers' location limits were obtained from the regional water joint stock company. In this study, using the water quality analysis code (UWQV), the amount of water quality changes in the seasonal periods of Anzali lagoon was analyzed in Sentinel-2 and Sentinel-3 images.

The average spatial distribution of the green spectrum (chlorophyll index) in different seasons showed that its numbers indicate the status of the quality index and chlorophyll, so that it is equal to 0.15 in autumn, 0.13 in winter, 0.06 in spring, and the summer season was equal to 0.13. The statistical results of the discharge of the rivers leading to the Anzali wetland, in all the coordinates of the lagoon lake, a similar seasonal trend was observed between the discharges due to the similarity of the feeding catchment basin, and this is while each of the average figures is 27 respectively. 0.0, 0.23, 0.08, 0.08 and 0.23 have shown the standard deviation of coordinate distribution.

Analyzing the water quality of Anzali wetland based on the changes in the chlorophyll index, and the changes in the amount of chlorophyll from one season to another showed a strong fluctuation, which confirmed the results of this research compared to other researchers. Also, the state of water health sediments shows a strong fluctuation in autumn, winter, summer, and spring seasons to a large extent.