Analysis on Water Quality Change Trend and Pollution Risk of Drinking Water from Songtao Reservoir and Nancha Reservoir
At present,Hainan province is promoting the construction of Hainan Free Trade Port across the island,proposing the integration of Danzhou and Yangpu,and promoting the third-level high quality development in Hainan Province.Songtao Reservoir and Nancha Reservoir are the centralized drinking water sources for Danzhou City,supplying both industrial and domestic water for key towns and regions of Haikou,Danzhou,Yangpu,and Chengmai.The protection and utilization of water resources in the two reservoirs is closely related to the construction and development of Danzhou,and even Hainan Province.To ensure the safety of drinking water source,routine monitoring data,sampling and testing separation data and automatic monitoringdata of Songtao Reservoir and Nancha Reservoir from 2016 to 2022 were selected to analyze and forecast the trend and risk of water quality changes in water sources based on five evaluation methods,including the single factor evaluation method,composite Nemerow pollution index method,composite eutrophication index method,Spearman rank correlation coefficient method and GM(1,1)prediction model.The results showed that the water quality of Songtao Reservoir and Nancha Reservoir was excellent,and the water qualification rate of water resource reached 100％.During the 13th Five-year Plan,the water quality of Nancha Reservoir was more stable than that of Songtao Reservoir.However,in 2021 and 2022,the water quality of Nancha Reservoir was significantly worse than that of the same during the 13th Five-year Plan,and the main pollutant was total phosphorus.During the 14th Five-year Plan,by taking corresponding pollution control measures,the water quality of Songtao Reservoir and Nancha Reservoir was up to or better than Class Ⅲ of surface water every month,and the risk of water quality deterioration in the water source was low.
Water sourcewater qualitycomposite pollution indexprediction modelpollution risk
万方数据
维普
