胶州湾水质自动站周边水质及运行效果分析

据2016年胶州湾水质自动监测的数据结果,分析了水质变化趋势,并统计和评价其水质超标情况。结果表明:2016-04—11水质自动站海域溶解氧质量浓度和pH 的日均值均达到二类海水水质标准,达标率为100%;活性磷酸盐年均值为0.023mg/L,无机氮年均值为0.154mg/L,以硝酸盐为主(64.9%);无机氮和活性磷酸盐超标率均为16.7%,而且集中在降雨量较大的8月、9月,营养盐指标超标基本与海泊河的淡水输入有关;叶绿素a质量浓度与溶解氧、pH 和浊度呈显著正相关,浮游植物光合作用对该海域表层海水的水质参数影响较大;自动站监测和人工监测的营养盐在年际变化上呈现较一致的趋势,说明运用水质自动站监测该海域的营养盐变化趋势较为准确。

Analysis of Water Quality at and Running Effect of the Automatic Monitoring Station in the Jiaozhou Bay

Based on the data acquired at the water quality automatic monitoring station in the Jiaozhou Bay in 2016, the variation trend and the standard exceeding status of the water quality are analyzed and evaluated. The results show that during the period from April to November in 2016 the daily means of pH and and dissolved oxygen all reached to the class II seawater quality standard, with the rate of reaching standard being 100%. The annual mean of DIP and DIN was 0.023 mg/L and 0.154 mg/L, respectively, of which DIN was dominated by NO₃N (making up to 64.9%). The standard exceeding days of DIN and DIP were both 16.7% and were mainly concentrated between August and September, when the rainfall was relatively heavy. The exceeding standard of the nutrient salt indexes was basically related to the input of fresh water from the Haibohe River. Chlorophyll a showed a significant positive correlation with dissolved oxygen, pH and turbidity, indicating that phytoplankton photosynthesis had a significant impact on the water quality parameters of the surface seawater in the study area. The nutrients obtained by the automatic monitoring station had a consistent trend in interannual variations with those obtained by manual monitoring, indicating that the variation trend of the nutrients monitored by using the water quality automatic monitoring station could be credible.