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

Abstract

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.

A multi-sensor framework in Google Earth Engine for trend analysis of water quality parameters in Anzali lagoon

“…The reports indicate the accuracy of measurements varies from case to case, and it depends on many factors (i.e.). But in general, high accuracy has been reported for measuring suspended solids (Pirali Zefrehei et al, 2021), turbidity (Weiqi et al, 2008), total nitrogen and phosphour (Sun, 2014), pH (Pereira et al, 2020), total dissolved solids (Aljoborey and Abdulhay, 2019), chloride (Amirsalari et al 2013), organic matter (Li et al, 2018), chlorophyII (Palmer et al, 2015) and dissolved oxygen (El Din et al, 2017). Weiqi et al, (2008) measured the values of turbidity, total nitrogen, ammonium, nitrate, total phosphorus and soluble phosphorus in Guanting Reservoir, Beijing, using Landsat 5 TM satellite images.…”

Studying the effect of Anzali port breakwaters on sedimentation in Anzali wetland using remote sensing

“…Pirali Zefrehei et al showed the decrease in transparency of Anzali wetland from 1985 to 2018. This indicates an increase in the concentration of suspended and organic particles in the wetland, which leads to a decrease in water quality in water bodies [21,22]. Anzali wetland provides spawning and nursery grounds for commercial species of the Caspian Sea [17].…”