菜子湖水位变化对水质的影响

Influence of Water Level Fluctuation on Water Quality of Caizi Lake

针对菜子湖水质对水位变化的响应问题,基于菜子湖国控断面水质和车富岭水文站水位监测数据,运用夏皮罗-威尔克检验、斯皮尔曼和皮尔逊相关系数法分析菜子湖水位与水质(TN、TP、COD、高锰酸盐指数等主要因子)之间的关系。结果表明:菜子湖年内水位呈现单峰变化,波动幅度较大,洪-枯季节性交替,水文节律明显,丰、枯水期平均水位落差3.79 m。菜子湖水位与TP浓度呈显著负相关(R=-0.604)。菜子湖水位在12 m左右时,湖区水质浓度维持在较低水平。菜子湖水位(尤其是枯水期)变化影响水质稳定达标及改善。此外,引江济淮工程调水导致菜子湖水文要素变化对水质的影响需进一步予以关注。

Based on the water quality of national control section of Caizi Lake and the water level monitoring data of Cheful-ing Hydrology Station,the relationship between water level and water quality(TN,TP,COD,permanganate index and oth-er major factors)of Caizi Lake was analyzed by using the Shapiro-Wilk test,Spearman and Pearson correlation coefficient method.The results show that the water level of Caizi Lake presents unimodal variation in the year,with a large fluctuation range,seasonal alternations between flood and dry,obvious hydrological rhythm,and the average water level drop of 3.79 m in the period of high and low water.There was a significant negative correlation between the water level of Caizi Lake and TP concentration(R=-0.604).When the water level of Caizi Lake is about 12 m,the water quality concentration of the lake is maintained at an inferior standard.The change of water level of Caizi Lake(especially in dry season)affects the sta-bility standard and improvement of water quality.In addition,further attention should be paid to the influence of the change of hydrological elements on water quality caused by the diversion of water from The Yangtze to Huaihe River Project.