Mapping Changes of Water Quality Parameters Pattern in Anzali International Wetland Using Remote Sensing

In this study, the environmental monitoring of Anzali international wetland (based on water surface temperature (WST), chlorophyll-a (Chl-a) and transparency (secchi disk depth (SDD)) parameters) using Landsat images in the period 1985–2018 has been studied. Based on the results of zoning maps, in 2018 and 2013, WST fluctuations are higher, with the lowest water temperature observed in 2007. Based on Chl-a, the trend for this parameter is increasing from 1985 to 2018. Also, from 1985 to 2018, we saw a decrease in transparency (SDD), which could indicate an increase in opacity and concentration of suspended and organic particles in the wetland, which was consistent with the results of chlorophyll-a. Graph examination of wetland showed more changes belonged to the central and eastern parts of the wetland. The results of this study indicate that in the Anzali international wetland, comparing the values of the parameters studied, there are not good conditions for water quality and the need for a solution and management policies to improve the condition of this unique ecosystem is necessary more than ever.