Water Quality Evaluation and Pollution Characteristics Analysis of Reservoir Type Water Source Areas in Dalian City
Reservoir A,located in Liaoning Province,is a water conservancy facility with multiple functions such as flood control and water supply.In recent years,reservoirs are facing water quality problems caused by internal deposition and external pollution.The monitoring results of water quality from 2021 to 2022 show that the overall water quality of reservoir A is mainly clean and relatively clean.There are seasonal changes in each water period,and the water quality is relatively poor in the wet season.In terms of spatial distribution,the comprehensive pol-lution index of most points in the reservoir area is lower than 0.4,and the water quality is good,while the pollu-tion degree of upstream points is higher.Especially the D002 point,the index is as high as 0.70,reflecting signifi-cant impact of upstream pollution.The analysis of nutrient state showed that the reservoir was mainly medium nu-trient,and the comprehensive nutrient state index(TLI)ranged from 40.86 to 51.93.From the perspective of water period,the nutrient level was slightly higher in wet period,and the average TLI was 50.1.The correlation analysis revealed the influence of water depth on pollution and nutrient status,especially in wet and normal water periods.In order to protect water quality,it is recommended to strengthen upstream pollution source control,improve sew-age treatment capacity,and reduce agricultural non-point source pollution.At the same time,through the planning of water source protection areas and ecological expansion projects,the ecological functions of reservoirs and the integrity of water source ecosystems are enhanced,drinking water safety is ensured,and regional sustainable de-velopment is promoted.
reservoireutrophicationspatiotemporal distribution
NETL
NSTL
万方数据
