磷矿区新建水库的富营养化趋势与防治

Entrophication Trend and Countermeasures of Newly-built Reservoir on the Phosphoric Mineral Area

90年代中期 ,开始对四川德阳市清平水库修建后的富营养化可能性及防治进行预研究 .对水库修建河段设四个断面进行连续 5个月水质监测 ,表明河水中 TP浓度高 .对水库蓄水初期的 TP时空水质预测模型和参数率定工作进行了深入的探讨 .用模型对大欠坪坝址和枇杷岩两个坝址建库的水质进行了模拟预测 ,发现两个坝址修建水库的水质都将超过湖库水质标准 ,并有可能发生富营养化 .其中 ,大欠坪坝址可以通过防治措施防止水库富营养化 ,而枇杷岩坝址修建水库在技术经济上是不可行的 .

A preliminary study on the possible eutrophication and countmeasures of Qingpin Reservoir, Deyang city, Sichuan Province, was carried out since 1990s. In this paper, the data from four monitoring river cross sections in five continuous months showed that the concentration of TP is very high, up to 0.193-0.554 mg·L -1 . The temporal and spatial distribution model of TP during initial stage of reservior operation, and method of defining parameters of model is discussed. The model is applied to simulate the change of TP concentration during the initial stage of Qinpin Reservior operation for two possible dams of Daqianping and Pibayan. The simulated results showed that the concentration of TP exceeds standard of water quality for both dams, 0.042mg·L -1 for the dam of Daqianping, and 0.082mg·L -1 for the dam of Pibayan, respectively. Hence the eutrophication will probably occur in Qinping Resevior after operation. Still, the eutrophication for Daqianping Dam would possibly be controlled conditioning some countermeasures be taken, while that for Pibayan Dam would not under present sci technical conditions.