Estimation of Spatial-Temporal Variations of Water Quality Parameters Using Remote Sensing: A Case of Mindu Reservoir, Morogoro, Tanzania

Water quality assessment offers an evidence necessary for making sound decisions toward compliance of water to its designated use. This study used Remote sensing-based algorithms to assess spatial-temporal variations of water quality at Mindu Reservoir in the Morogoro Region for the period of six months from November-۲۰۲۴ to April-۲۰۲۵. Whereby, remotely sensed data were obtained through Sentinel-۲ MSI sensor on a satellite temporal resolution basis, and the in-situ data were collected within the same period in the days coinciding and/or closely coinciding (±۱ day) with Sentinel-۲ satellite visit for better accuracy assessment. The assessed water quality parameters were Turbidity, Total Suspended Solids (TSS), Electrical Conductivity (EC), and potential of Hydrogen (pH). Various algorithms derived from literatures were used in the GEE JavaScript API for mapping water quality parameters (WQPs), and the Microsoft Excel was used to establish regression relationships between the remotely sensed indices and the in-situ measured values. The results show good accuracy and are statistically significant with R۲ =۰.۷۲۱۴, (p<۰.۰۰۱۸۷); R۲ =۰.۸۰۴۶, (p<۰.۰۱۵); R۲ =۰.۶۸۳۸, (p<۰.۰۰۳۱۷); and R۲ =۰.۷۳۹۴, (p<۰.۰۰۱۴) observed in developed algorithms for Turbidity, TSS, EC, and pH estimation respectively. The RMSE and MAE were also used to assess the accuracy of generated algorithms in prediction of the actual in-situ measured data. Highlighting the potentiality of Remote Sensing in retrieving WQPs

کلیدواژه ها:

remote sensing ، Water Quality Parameters (WQPs) ، Turbidity ، Total Suspended Solids (TSS) ، Electrical Conductivity (EC) and potential of Hydrogen (pH)