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为探究极端厄尔尼诺事件对分层型水库夏季水质的影响,分别于正常年(2012年)和厄尔尼诺年(2015年)的5~8月对枣庄周村水库主库区和入库径流的物理和化学指标进行了监测.结果表明,周村水库正常年夏季降雨量明显高于厄尔尼诺年夏季;正常年夏季水位由124.26 m上升至127.14 m,恒温层厚度增加3.1 m;而厄尔尼诺年夏季水位由121.65 m下降至119.46 m,恒温层厚度减少3.2 m.周村水库入库径流属表层流,其营养盐浓度明显高于库区变温层.正常年夏季外源营养盐的汇入导致库区变温层总氮由1.00 mg·L~(-1)升至2.60 mg·L~(-1),硝态氮由0.19 mg·L~(-1)升至1.28 mg·L~(-1),总磷由0.023mg·L~(-1)升至0.088 mg·L~(-1),而厄尔尼诺年夏季库区变温层营养盐浓度变化不大.厄尔尼诺年夏季恒温层水体还原性污染物浓度明显高于正常年同期水平,其中铁、锰、氨氮和硫化物浓度的最大值分别为0.38、1.36、2.36和1.67 mg·L~(-1),均超过地表水Ⅲ类水质标准.极端厄尔尼诺事件对周村水库夏季变温层水体营养盐浓度和恒温层水体污染物浓度均有较大的影响.
In order to investigate the impact of extreme El Niño events on the summer water quality of stratified reservoirs, the physical and chemical properties of the main reservoir and the runoff of the Zhoucun reservoir in Zaozhuang from May to August in normal years (2012) and El Nino years (2015) The results show that the normal summer annual rainfall of Zhoucun Reservoir is obviously higher than that of El Nino summer; the normal summer water level rises from 124.26 m to 127.14 m, and the temperature of the thermosphere increases 3.1 m; while the El Niño summer water level changes from 121.65 m down to 119.46 m, and the thickness of thermostat decreased by 3.2 m. The runoff from Zhoucun Reservoir belongs to the surface current and its nutrient concentration is obviously higher than that of the reservoir area. The import of exogenous nutrients in normal years leads to the change of temperature in the reservoir area Total nitrogen increased from 1.00 mg · L -1 to 2.60 mg · L -1 while nitrate nitrogen increased from 0.19 mg · L -1 to 1.28 mg · L -1, Phosphorus increased from 0.023mg · L -1 to 0.088 mg · L -1, while El Niño did not change much in the temperature-changing layer of nutrient layer in the summer of the year. The concentration of reducing pollutants in the El Niño summer monsoon water was significantly Higher than the normal level of the same period, of which the maximum concentration of iron, manganese, ammonia nitrogen and sulfide were 0.38,1.36,2.36 and 1.6 7 mg · L -1, both of which exceeded the surface water quality standards of Class III surface water.The extreme El Niño events had a great impact on the nutrient concentrations of summer albumen water body and the pollutants in the water body of constant temperature in Zhoucun Reservoir.