Assessing water quality is an important basis for protecting water ecosystems and managing water pollution.In 2021,15 water quality indicators of three cross-sections were monitored and analyzed to study the water quality characteristics of Xiaol-angdi Reservoir during different water periods.Three methods were used to make a comprehensive assessment of the water quality in the area studied.The main environmental factors affecting water quality in different water periods were discussed and their sources analyzed,the pattern of water quality changes was clarified,and the best evaluation method was determined.The results show that total nitrogen concentration in the reservoir exceeds surface water standard Ⅴ,while all other water quality indicators reach standard Ⅲ and above.The three methods were influence on the weighting of the indicators and the assessment results are different.A comprehensive comparison and analysis revealed that the method of weighting and ranking the information based on TOPSIS is more suitable for the evaluation of the water quality conditions in the study area.The correlation analysis showed that the environmental factors affecting the water quality and the sources of these factors are different in the different water periods.The dry water season was influenced by human activities,the water quality changes in the shallow water season were related to upstream inputs,and the dry water season was greatly influenced by rainfall and hydrodynamics.This study can provide a scien-tific basis for the water environment management and provide new ideas for water quality evaluation of Xiaolangdi Reservoir.
维普
万方数据