武汉水果湖水质特征变化研究

Study of Feature Variation of Water Quality of Shuiguo Lake in Wuhan

为探索城市湖泊受人类活动影响水质变化规律,以武汉水果湖为例,于2012年5月至2013年4月选取水果湖有代表性的6个采样点,对总磷、总氮、COD水质指标进行监测,采用综合污染指数法对水质现状进行评价,并分析了其变化与气象因素的关系.结果表明：水果湖总磷浓度在8月份较高,最高达到2mg/L,总磷变化与同期月平均气温和日照在整体变化趋势上较为一致;总氮浓度在4月和1月份最高达3 mg/L,全年呈波浪起伏状,且总氮含量与同期风速有一定的相关关系;COD浓度在5～7月最高达85 mg/L.整体各月水质情况4～8月水质为劣V类,1月和11月V类,其余月份为Ⅳ类.从空间情况看与东湖连通之处水质相对较好,为V类,与沙湖连通处为劣V类.

To explore feature variation of water quality of urban lakes caused by human activities,Shuiguo Lake is taken as an example and 6 representative sampling points are selected there for monitoring of water quality indicators such as TP,TN and COD on a monthly basis from May 2012 to April 2013.Integrated pollution index method is used to evaluate the current status of water quality and the relationship between water quality variation and meteorological factors is also analyzed.The results show that TP concentration in Shuiguo Lake is highest in August,reaching to 2 mg/L maximally.From the overall variation trend,variation of TP is more consistent with that of monthly average temperature and sunlight over the same period.TN concentration is highest in April and January,reaching to 3 mg/L maximally.TN variation in the whole year appears in a fluctuating pattern and there is a certain correlation between TN content and monthly average air velocity over the same period.COD concentration is highest from May to July,reaching to 85 mg/L maximally.With regard to the overall status of water quality,it is worse than Grade V from April to August,but is Grade V in January and November and Grade IV in the other months.From the spatial perspective,water quality at the connection to East Lake is relatively good as Grade V,while water quality at the connection to Sha Lake is worse than Grade V.