韶关市水库水质综合评价与分析

Comprehensive Evaluation and Analysis of Reservoir Water Quality in Shaoguan

本研究对韶关市12个水库的11项水质指标进行了监测,运用单因子评价法、综合营养状态指数法(TLI)、水质质量指数综合评价法(WQI)和水质健康综合评价法(ETI)对水库水质进行了综合评价,并采用多元统计方法,识别引起各水库水质空间差异的主要因子,以及分析影响ETI和WQI评价结果的主导因子。结果表明;(1)单因子评价结果中有4项水质指标超标,超标项目为五日生化需氧量、总磷、总氮和粪大肠菌群,5个水库达到Ⅲ类水质标准;(2)各水库TLI评价结果为24.17~43.04,3个水库为贫营养水平,9个水库为中营养水平,各水库营养状况总体良好;(3)各水库ETI评价结果为0.22~0.96,其中水质为优秀和良好等级的水库数量分别为8个和2个,中等和较差等级的水库数量均为1个;(4)各水库WQI评价结果为62.13~87.69,4个水库为水质优秀等级,8个水库为水质良好等级。

This study monitored 11 water quality indicators of 12 reservoirs in Shaoguan,The comprehensive evaluation of reservoir water quality was carried out by using single-factor evaluation method,comprehensive trophic level index method(TLI),water quality index comprehensive evaluation method(WQI)and water quality health comprehensive evaluation method(ETI).And multivariate statistical methods were used to identify the main factors causing the spatial differences of water quality in each reservoir and analyze the dominant factors affecting the evaluation results of ETI and WQI.The results show that:(1)In the single-factor evaluation results,there are four water quality indicators exceeding the standard.The exceeding items are five-day biochemical oxygen demand,total phosphorus,total nitrogen and fecal coliforms.Five reservoirs reach Class Ⅲ water quality standards.(2)The TLI evaluation results of each reservoir are 24.17~43.04.Three reservoirs are at oligotrophic level and nine reservoirs are at mesotrophic level.The nutritional status of each reservoir is generally good.(3)The ETI evaluation results of each reservoir are 0.22~0.96.Among them,the number of reservoirs with excellent and good water quality grades is 8 and 2 respectively,and the number of reservoirs with medium and poor grades is 1 each.(4)The WQI evaluation results of each reservoir are 62.13~87.69.Four reservoirs are at excellent water quality grade and eight reservoirs are at good water quality grade.